Showing papers on "Pulley published in 2012"

Power transmission device

Abstract: Disclosed is a power transmission apparatus constructed to detect the deterioration state of a timing belt in use, thereby making it possible to detect at a high accuracy whether or not the timing belt reaches an exchanging time. The power transmission apparatus 1 comprises a crankshaft pulley 41 provided on a crankshaft 11, an intake camshaft pulley 43 provided on an intake camshaft 22, and a timing belt 46 wound around the crankshaft pulley 41 and the intake camshaft pulley 43. The timing belt 46 contains a stress light emission material capable of emitting light when receiving an external force. The power transmission apparatus 1 further comprises an optical sensor and an ECU 4. The optical sensor is disposed in face-to-face relationship with the timing belt 46 to measure light emitted from the timing belt 46. The ECU 4 is operative to judge whether or not the timing belt is deteriorated and to judge that the timing belt 46 reaches the exchanging time when the timing belt is judged to be deteriorated.

Influence of Pulley Kinematics on Cable-Driven Parallel Robots

Abstract: In this paper the modeling of a pulley mechanism for cable-driven parallel robots is presented. In many works, the proximal anchor points of the robots are simplified to be ideal points. Real cables achieve reasonable life time only when a minimum bending radius is exceeded. Therefore, pulley mechanisms have to be used which in turn require the extension of the kinematic modeling. In this paper a kinematic model for a pulley mechanism of the winches is revisited. Then we derive a corrected structure equation and compare the different results from the extended model with the estimation from the simplified standard model with respect to kinematics transformation, workspace, and force distribution.

Exoskeleton for gait assistance and rehabilitation

Abstract: A method of operating an exoskeleton device includes: receiving sensor information; connecting a clutch system to a pulley system in; determining whether to engage a drive train gear to the clutch system based on the sensor information; engaging the drive train gear through the clutch system when determined to engage the drive train gear; and powering a first motor to drive the drive train gear for controlling a joint or segment of exoskeleton device.

Varied Anatomy of the Thumb Pulley System: Implications for Successful Trigger Thumb Release

Abstract: Purpose The anatomical arrangement of the thumb pulley system continues to be revised through ongoing investigative research, changing our previous assumptions. This study demonstrates the components and anatomical features of this pulley system in an effort to improve surgical outcomes and to clarify current misconceptions. Methods Researchers procured 75 hand specimens from 41 adult cadavers through our institution's anatomical donations program. Dissections of the thumb and thenar compartment identified the various pulleys. A detailed analysis of the thumb pulleys was performed through various measurements. Results Four different pulley categories were identified: type I (n = 5), type II (n = 29), type III (n = 29), and type IV (n = 12). The variable annular pulley was present in 70 of 75 hands (93%) in 1 of 3 arrangements: transverse, oblique, or fused with the A1 pulley. Conclusions The pulley system of the thumb is composed of 4 components, as opposed to the traditional view of only 3. Along with the A1 pulley, the additional variable annular pulley might contribute to stenosis in trigger thumb. This might necessitate a more extensive surgical incision and its partial release to relieve triggering. Clinical relevance Understanding the anatomical configuration of the thumb pulley system will aid in the surgical attempt to resolve triggering while avoiding complications such as bowstringing of the flexor pollicis longus tendon and iatrogenic nerve injury.

Medical device control handle with multiple puller wires

Abstract: A medical device control handle or catheter includes deflection assembly and at least one of the following: a disk actuator, a lever actuator and a ring actuator for actuating additional puller wires in manipulation of multiple features of the medical device or catheter independently of each other. The disk actuator has a common rotational axis with the deflection assembly as the disk actuator is mounted on a portion of the pulley arm but is rotationally independent of the pulley arm. The lever actuator has a separate rotational axis from that of the pulley arm and can be distal of the pulley arm with its rotational axis is oriented generally perpendicular of the rotational axis of the pulley arm. The ring is mounted outside of the control handle and rotatable relative to the control handle to actuate another puller wire for manipulating another feature of the catheter. Each of the disk, lever and ring actuators are of a design that allows existing control handles and catheters to be readily modified to include these actuators.

Compact peristaltic medical pump

Abstract: A compact medical pump includes a linear peristaltic pumping mechanism driven by a motor located within a periphery of a belt of the pumping mechanism. The motor drives a gear set that drives a driving pulley which engages the belt having the rollers. A battery for the pump is positioned adjacent to the gear set. The pump includes a controller and user interface for operating the pumping mechanism as a function of pumping parameters input via the user interface. The controller may sense motor current and determine fluid path characteristics based on the sensed current.

Effects of deformation in the dynamics of belt drive

Abstract: The dynamics of a belt drive is considered in the framework of a nonlinear model of an extensible elastic string. Under the assumption of contour motion, in which the trajectories of particles of the string are pre-determined, we transform the general equations of string dynamics to the spatial description. Further simplification regarding the absence of slip of the belt on the surface of the pulleys leads to a new model with a discontinuous velocity field and concentrated contact forces. It is shown how the computed parameters of steady operation of the drive are influenced by the chosen strain measure for the string, and differences in the behavior of synchronous and friction belt drives are pointed out. For a sample set-up, we study the dependence of the maximal transmitted moment on the angular velocities of the pulleys and on the pre-tension of the belt.

Mass balancing device and method for lower limb rehabilitation training patient

Abstract: The invention relates to a mass balancing device and method for a lower limb rehabilitation training patient. The balancing device comprises a reduced gravity generating mechanism, a bracket, an electric winch, a steel wire rope, a pulley wheel, a force sensor, a suspender, a running machine and a control system. When a reduced gravity walking training is carried out, the patient wears the suspender to stand on the running machine; the suspender is connected to the steel wire rope through the pulley wheel and two ends of the steel wire rope are respectively mounted on the reduced gravity generating mechanism and the electric winch; and the size of the actual reduced gravity detected by the force sensor is fed back to the control system to realize closed-ring control. Aiming to the patient of lower limb motor dysfunction caused by central nervous system diseases including spinal injuries, brain stroke and the like, a load to lower limbs of the patient which is caused by the self-gravity of the patient and the dynamic load in the walking process can be simultaneously relieved when the reduced gravity walking training is carried out, so as to realize constant-mass gravity reduction. According to the rehabilitation conditions of the patient or the training requirements, a weight reducing device provided by the invention can conveniently adjust a gravity reducing ratio. The suspender of the weight reducing device can be moved along the gravity center of the patient in real time and is good for the rehabilitation of normal physiological gaits of the patient.

Calibration device and method of six-dimensional force sensor

Abstract: The invention relates to a calibration method of a six-dimensional force sensor. A device for the method comprises a calibration work table, a bracket, a parallel pulley, a high-end pulley and a load applying rope, wherein the bracket is provided with two pulley spindles; the parallel pulley and the high-end pulley are respectively positioned on the two pulley spindles; the load applying rope bypasses the parallel pulley and the high-end pulley; the calibration work table is fixedly provided with a calibration adjusting plate, a sensor pretightening plate and a load positioning plate, wherein the sensor pretightening plate is connected with the calibration adjusting plate through pretightening screws, and the load positioning plate is fixedly connected with the sensor pretightening plate; the six-dimensional force sensor to be calibrated is clamped and arranged between the calibration adjusting plate and the sensor pretightening plate in a pretightening state; and the load positioning plate is provided with five load applying points in cross shapes. The device in the invention has the advantages of relative simple and compact structure, low cost, better generality and easy operation and has the most outstanding advantages of no only carrying out static calibration on the six-dimensional force sensor, but also carrying out dynamic calibration on the six-dimensional force sensor in the calibration device by only easily changing operation.

Turbine blade vibration characteristic testing and measuring device with shroud damping block and blade root wedged damping block

Abstract: The invention discloses a turbine blade vibration characteristic testing and measuring device with a shroud damping block and a blade root wedged damping block. The device comprises a test foundation rack, a blade root contact surface pressure load applying mechanism, a centrifugal force applying mechanism for the blade root wedged damping block and the shroud damping block, an exciting force applying mechanism and a vibration parameter measuring mechanism, wherein the blade root contact surface pressure load applying mechanism applies pressure load to the blade root contact surface, and the applied pressure load is measured by a standard test piece adhered with a strain gauge; corresponding centrifugal force load is applied to the blade root wedged damping block and the shroud damping block by utilizing a steel wire pulley structure, and the applied centrifugal force of the damping block is measured by adopting a static force sensor; a vibration exciter is connected with a blade bodypart of the blade and applies an exciting force to the blade; and the measured vibration parameter corresponds to the vibration displacement response of the blade, the vibration displacement responseof the blade is measured by a displacement transducer, and a force signal and a displacement signal are detected through a force sensor and the displacement transducer.

Design and Development of a Multifingered Prosthetic Hand

Abstract: This paper focuses on the development of a robotic hand having fourteen degree-of-freedom (DOF) to trigger finger movement. The design combination and integration of fingers will produce a prosthetic hand which is approximately the size of a human hand. The prototype hand comprised of servo motors located at the palm to drive the pulley and belt mechanism connected to each of the finger joints enabling independent flexion finger link movement. A lightweight Light Dependent Resistor (LDR) sensor is positioned at the middle of the palm is to close around objects. The prosthetic provides three different controls of finger movement through the use of a Graphical User Interface (GUI) with computer interface, program and manually controlled and autonomous movement provided by a micro-controller of this robotic hand. The prototype hand model was developed using rapid prototype technique in order to get the best part quality and reduction in weight. The link parameter analysis to determine the end tip position of the robotic finger at certain rotation angle was computed. Experimental work has been carried out on the prototype robotic hand to ensure the entire rotation angle and movement of each link is functioning as desired.

Electrically-driven speed change device for vehicles

Abstract: The invention provides an electrically-driven speed change device for vehicles. The electrically-driven speed change device comprises a motor and a transmission mechanism, wherein the transmission mechanism comprises an input shaft, a speed change mechanism, an intermediate shaft, a retarding mechanism and an output shaft; the motor comprises a stator and a rotor; the rotor is connected with the input shaft; the input shaft is connected to the intermediate shaft by the speed change mechanism; the intermediate shaft is connected to the output shaft by the reducing mechanism; the speed change mechanism comprises a parallel shaft gear set and a synchronizer, and realizes gear shifting by the synchronizer. By the electrically-driven speed change device for the vehicles, a clutch is saved, namely the gear shifting can be realized conveniently by the synchronizer, and two-gear transmission and multi-gear transmission are easy to realize; and reverse gear can be realized conveniently by controlling the motor appropriately, so an idle pulley for realizing transmission reversing in common vehicles is saved, the cost is saved effectively, and a structure is simplified.

Therapeutic massage chair

Abstract: The utility model discloses a therapeutic massage chair. A fixing shaft is connected with the top of two chair back positioning plates on two sides of the chair seat, and two ends of the fixing shaft are provided with upper fixed pulleys; a driving shaft is arranged on a fixing frame, a motor is connected with the driving shaft through a reduction gear, and two ends of the driving shaft are provided with a lower fixed pulley respectively; two ends of a moving shaft provided with massage rollers are inserted into chutes of the chair back positioning plates, and a rotatable movable pulley and a fixed rolling movable pulley are arranged at two ends of the moving shaft; after a main cable is wound on the lower fixed pulleys, one end of the main cable winds around the upper fixed pulleys and is fixedly connected with the movable pulleys, and the other end of the main cable is directly and fixedly connected with the movable pulleys; after an auxiliary cable is wound on the fixed rolling movable pulley, two ends of the auxiliary cable respectively wind around the upper and lower fixed pulleys and are connected; upper and lower limiting switches are arranged on and below the chutes; the motor drives the lower fixed pulleys to penetrate through the two cables, so that the massage rollers roll up and down for massaging; supporting shafts and waist massage discs are symmetrically arranged on armrests on two sides; and chains are connected with small chain wheels of the driving shaft and large chain wheels of the supporting shafts so as to drive the waist massage discs to rotate and massage. By the massage chair, a plurality of parts of a human body are massaged through the motor, and the structure is simplified.

Leisure body-building chair

Abstract: The invention discloses a leisure body-building chair, which relates to a chair specially suitable for special purposes. The leisure body-building chair comprises five parts: a chair body, a lower limb body-building mechanism, an upper limb body-building mechanism, a back massaging mechanism and an energy storage device, wherein the lower limb body-building mechanism comprises a pedal folding mechanism, a first-level folding mechanism, a second-level folding mechanism, a synchronous pulley mechanism a, a synchronous pulley mechanism b and a synchronous pulley mechanism c; the upper limb body-building mechanism comprises two handles, two power rods, two steel wire ropes, two pulleys, two stop blocks and two springs; the back massaging mechanism comprises an electromotor, a crank rocker mechanism, a shaft a, a synchronous pulley mechanism d, a shaft b, a synchronous pulley mechanism e, a shaft c, a hammering tool a and a hammering tool b; and the energy storage device comprises an engine and a storage cell. According to the leisure body-building chair, functions of training the upper limbs and the lower limbs and massaging the back on the human body are combined, and meanwhile, energy generated by motion is stored in an electric energy form so as to achieve a purpose of saving energy.

Clutch mechanism and decoupler device with same

Abstract: A clutched device that includes a pulley, a shaft member, a first one-way clutch having a first wrap spring, and an actuator having an electromagnetic coil and an armature. The first one-way clutch rotationally couples the pulley and the shaft member when the actuator is actuated and rotary power is transmitted from a first one of the pulley and the shaft member to the other one of the pulley and the shaft member in a first rotational direction. A frictional force is applied to the armature when the actuator is activated. The frictional force is configured to resist rotation of the armature to cause the first wrap spring to radially expand into driving engagement with a clutch surface that is coupled to the pulley for common rotation.

Magnetic separator system and method using spatially modulated magnetic fields

Abstract: A magnetic separator system may include a rotating wheel, a conveyor belt drawn around the wheel, and at least one magnetic array. The pulley transports material mix through a spatially modulated magnetic field generated by the magnetic array. The magnetic array may be fixed in place on the pulley and directed towards the stream of material mix, or multiple magnetic arrays may be distributed on the conveyor belt or wheel of the pulley.

Active wire paying-off rewinder of aluminum clad steel wires

Abstract: The invention discloses an active paying-off rewinder of aluminum clad steel wires The rewinder is characterized by comprising an active paying-off mechanism, a tension mechanism and an automatic wire arranging and taking-up mechanism, wherein the aluminum clad steel wire grail tool of the active paying-off mechanism of the rewinder is driven by a motor to realize uniform wire paying-off; an upper tension pulley of the tension mechanism is fixed on a rack, and a lower tension pulley of the tension mechanism is jointly supported by a pneumatic cylinder and a lower tension pulley support; under the action of the pneumatic cylinder and aluminum clad steel wire tension, the tension pulley is used for adjusting the aluminum clad steel wire tension by vertical movement; and the automatic wire arranging and taking-up mechanism is characterized in that a wire arranging seat rotating shaft, a wire arranging seat guide rail, a movable mandril and a fixed mandril are arranged between two fixed supports; the wire arranging seat rotating shaft is provided with a wire arranging seat and a wire arranging seat driving wheel; the wire arranging seat guide rail is provided with two stop pins for playing a limit role; the movable mandril and the fixed mandril are respectively connected with the grail tool in a splicing mode; the fixed mandril is provided with a grail tool driving wheel, a brakepad and a driven wheel; and the driven wheel is connected with the wire arranging driving wheel which is arranged on the wire arranging seat rotating shaft by a driving belt Therefore, the product quality is ensured, the production efficiency is improved and the labor intensity is reduced

Electromagnetic anechoic chamber

Abstract: An electromagnetic anechoic chamber includes an anechoic chamber, an adjusting apparatus, and an antenna device. The anechoic chamber includes a bottom wall defining a rectangular receiving space, and a shielding plate supported on a bottom wall. The adjusting apparatus is received in the receiving space and includes a supporting bracket, two adjusting pulleys respectively installed to two opposite ends of the supporting bracket, and a transmission belt wrapping around the adjusting pulleys. The antenna device includes a base slidably supported on the supporting bracket and an adjusting pole perpendicularly extending up from the base. The adjusting pole extends through the transmission belt and the shielding plate. A motor drives one of the adjusting pulleys to rotate, the transmission belt is moved through the adjusting pulley to move the antenna device.

Belt tensioning assembly for an engine system having a motor-generator unit

Abstract: A system for maintaining tension in a drive belt comprises a first belt tensioner that comprises a first pulley mounted on a first lever arm, and a second belt tensioner that comprises a second pulley mounted on a second lever arm. The first belt tensioner is configured and positioned to bias the first pulley against the drive belt at a first location following a departure of the drive belt from a pulley coupled to a motor-generator unit and to thereby maintain tension on the drive belt during both driving and driven modes of the motor-generator unit. The second belt tensioner is configured and positioned to bias the second pulley against the drive belt at a second location prior to an approach of the drive belt toward the pulley and to thereby maintain tension on the drive belt at the second location during both driving and driven modes.

Engine crankshaft isolator assembly

Abstract: An engine assembly includes an engine structure, a crankshaft rotationally supported on the engine structure, a crankshaft isolator assembly and a belt. The crankshaft isolator assembly includes a hub fixed for rotation with the crankshaft, a crankshaft isolator pulley coupled to the hub, and a mechanical clutch. The mechanical clutch is engaged with the hub and the crankshaft isolator pulley. The mechanical clutch fixes the hub for rotation with the crankshaft isolator pulley during a first operating condition and allows relative rotation between the hub and the crankshaft isolator pulley during a second operating condition. The belt is engaged with the crankshaft isolator pulley and an accessory drive system.

Photography studio with turntable driving mechanism

Abstract: A photography studio with a turntable driving mechanism is provided. The turntable is driven to start or brake by at least two timing pulleys contacting with the side of the turntable, and the timing pulleys were driven synchronously by another motorized timing pulley through a timing belt. Therefore, at least two indirect contact points are formed between the motorized timing pulley and the turntable to increase the contact friction to avoid sliding when the rotation of the turntable starts or brakes. In addition, a multilayer platform for shooting shadow-free images is proposed, which comprises a thicker transparent glass plate or plastic plate covered with a thinner curved translucent plastic plate and a group of lamps disposed under or behind the multilayer platform.

Vertical swim trainer

Abstract: A swim trainer comprising: a base; an upright member extending from the base; two arms each carried by the upright member and terminating with an end pulley; two pull cords each having one end connected to a hand pull, extending from the hand pull over the end pulley, a second pulley positioned adjacent to the upright member, and then along the upright member; a rotatable shaft positioned adjacent to the base; a loading mechanism, connected to the shaft, to resist rotation and unwinding of the cord around the shaft; a clutch assembly positioned on the shaft arranged to rotate the shaft when the handle is pulled down and otherwise spin freely; a rewind bias means to rewind the cord around the shaft; and, a tipping and/or rotating balance platform assembly, seated on the base, for the swimmer to stand on, when pulling the hand pull.

Upper limb rehabilitation training system with active-passive modes

Abstract: The invention belongs to the technical field of medical instruments, and relates to a rehabilitation training system, in particular to an upper limb rehabilitation training system with active-passive modes. The technical scheme includes that the upper limb rehabilitation training system with the active-passive modes comprises a handle, a mechanical arm, a spindle, an encoder, a computer, a display, a motor, a clutch, a coupler, a belt pulley, a belt pulley shaft, a synchronous toothed belt and a rehabilitation device base. Compared with equipment in the past, the upper limb rehabilitation training system has the advantages that active acting force is provided for a patient needing rehabilitation, the mechanical arm can drive an arm of the patient to perform rehabilitation training in the active mode so as to achieve better rehabilitation training effects, and a threshold safety module is arranged inside the computer so that safety of the patient in rehabilitation training can be enhanced.

Overrunning pulley with elastomer torsional damping system

Abstract: The present model refers to the technical field of parts for the automobile sector, more specifically a overrunning pulley with elastomer torsional damping system used preferably in alternator coupled to the crankshaft through a belt, with the aim to absorb and reduce torsional vibrations, which the entire system coupled to the aforementioned belt is subjected, as well as mitigate the rotation variations that are transmitted to the alternator through the one-way clutch by rollers.

Robot and control device for same

Abstract: A robot is provided with: a base section; three motors set on the base section; a support so set that an axial centerline is perpendicular to a surface of the base section; pulleys; three wires into which nonlinear springs are incorporated; an output shaft connected to a load; a differential mechanism having a pinion gear connected to the output shaft and also having an affixation member disposed at the upper end of the support; a universal joint disposed at the ring of the differential mechanism; and a wire guide disposed at the affixation member of the differential mechanism Two side gears of the differential mechanism and two motors are connected in one-to-one correspondence by means of two wires through the pulleys, and the remaining motor and the universal joint are connected by means of the remaining wire which is passed through the wire guide

Pulley assembly with a decoupling mechanism

Abstract: Various pulley assemblies are described that include a pulley body, a hub defining an axis of rotation disposed within a bore of the pulley body, and an actuator and a clutch mechanism disposed about the hub. The actuator axially expands when the pulley body rotates in a predominant direction, and the clutch mechanism is activated thereby into an engaged position. In this engaged position, the clutch mechanism links the pulley body to the hub for simultaneous rotation in the predominant direction. Then, when the pulley body rotates in a non-dominant direction or experiences a deceleration, the pulley assembly enters an overrun position where the clutch mechanism disengages and allows the hub to rotate at speeds greater than the pulley body. Additionally, a reverse configuration is described where the actuator axially expands when the hub rotates and the clutch mechanism, when engaged, links the hub to the pulley body.

Ocean floating type drilling platform crown-block heave compensator

Abstract: The invention relates to an ocean floating type drilling platform crown-block heave compensator which comprises an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are fixedly connected to the upper part and the lower part of an crown block frame respectively; the top of the upper bracket is fixedly connected with a connecting frame; two pairs of guide rails are vertically arranged between the connecting frame and the crown block frame in parallel; a floating pulley assembly which can move up and down along the guide rails is arranged on the guide rails; the lower end of the floating pulley assembly is connected with a hydraulic cylinder assembly; the hydraulic cylinder assembly is connected with a power and control system; a fast line rocking arm assembly, a fast line guide device, a dead line rocking arm device and a dead line guide device are respectively arranged on the crown block frame; the fast line guide device and the dead line guide device are respectively connected with the floating pulley assembly; and the fast line rocking arm assembly, the fast line guide device, the floating pulley assembly, a loose pulley, the dead line guide device and the dead line rocking arm device are connected by steel ropes. The heave compensator has the advantages of large compensation load, compact structure, low energy consumption and good compensation effect and can meet the performance requirement of ocean drilling well operation and realize automated control operation.

Friction drive belt and manufacturing method therefor

Abstract: In order to allow a friction drive belt to have an effect of reducing slip noise produced between the belt and pulleys for a long period even when the belt gets wet with water or suffers from wearing out, a V-ribbed belt B as the friction drive belt includes a belt body 10 made of a rubber composition and configured to be wrapped around the pulleys to transmit power. The surfaces of V-shaped ribs 15 serving as a pulley contact-side surface of the belt body 10 are covered with a fabric layer 16 which is integrated with the surfaces of V-shaped ribs 15 , and the fabric layer 16 retains powder 17 embedded between fibers of the fabric layer 16 and integrally stuck.

Cable drive and tension assembly

Abstract: A tensioning assembly having a drive pulley, a tension pulley and a tension adjustment system is provided. The drive pulley has a first drive pulley channel and a second drive pulley channel. The tension pulley has a first tension pulley channel and a second tension pulley channel. The second tension pulley channel is aligned with the first drive pulley channel. The first drive pulley channel and the second drive pulley channel of the drive pulley and the first tension pulley channel and a second tension pulley channel of the tension pulley are configured and arranged to engage and route an endless looped member. The tension adjustment system is coupled to adjust the distance between the drive pulley and the tension pulley to adjust the tension in the endless looped member in relation to the drive pulley.