Abstract: Tensioner for an accessory drive of a motor vehicle each have a support element adapted to be fixed on an electric machine, an intermediate element carried by the support element and rotating with respect thereto about a first fixed axis, a rigid tensioner element rotating with respect to the intermediate element about a second axis parallel to the first axis, a pair of tensioner pulleys carried by the tensioner element and adapted to cooperate with respective branches of an endless drive element of the drive positioned on opposite sides with respect to the electric machine, and a spring acting between the support element and the intermediate element to push the tensioner pulleys into contact with the endless drive element.

Abstract: The disclosure relates to a method for detecting belt slip of a belt drive driving a generator of an internal combustion engine, said belt drive having a belt tensioner that can be adjusted in operation and adjusts the pre-tensioning force of the belt according to the detected belt slip. According to said method, the rotational speed profile of the crankshaft is recorded during an angular window of the crankshaft of m·360 degrees and an average value of the crankshaft rotational speed is formed from said rotational speed profile; temporally independently from the recording of the rotational speed profile of the crankshaft, the rotational speed course of the generator shaft is recorded during an angular window of the generator shaft of n·u?1·360 degrees and an average value of the generator shaft rotational speed is formed from said rotational speed profile.

Abstract: In an aspect, a V tensioner is provided and includes a first arm and a second arm. A damping structure and a damping system biasing member are provided. The damping system biasing member is positioned axially in between the first and second arms.

Abstract: To provide a tensioner capable of keeping oil pressure in an oil pressure chamber stable with a simple structure. The tensioner is equipped with a pressure adjusting mechanism that adjusts oil pressure in the oil pressure chamber and includes an adjustment space formed in a housing and communicating with the oil pressure chamber, a movable member disposed such as to be movable to and from the oil pressure chamber, and a pressure adjusting biasing unit that biases the movable member toward the oil pressure chamber. A liquid tight seal is maintained between the movable member and an inner wall of the adjustment space, between a position where the movable member has moved closest to the oil pressure chamber and a position where the movable member is farthest from the oil pressure chamber.

Abstract: A hydraulic tensioning device for a chain drive, including tensioning piston, which is guided in a holder and which has locking grooves on the outer peripheral surface of the tensioning piston, and including a locking element, which has at least two annular sections and at least two radial extensions, wherein the locking element can be brought into engagement with one of the locking grooves by the at least two annular sections, and including a clamping stop and a sliding stop, which are axially spaced apart from each other. In order to simplify the design, the holder has at least two axial extensions, which extend in the axial direction between the clamping stop plane and the sliding stop plane. The at least two axial extensions and the tensioning piston do not enclose the at least two radial extensions.

Abstract: An orifice member is disposed in a plunger including a plunger hole that forms a hydraulic chamber in conjunction with a plunger housing hole in a housing. The orifice member includes a deformed fitting section deformed to fit on the inner circumferential surface of the plunger hole, a communication section that causes a surface in contact with the top surface on the front side of the plunger hole and a surface on the hydraulic chamber side to communicate, and an orifice groove that communicates with the communication section and an external relief hole provided in the plunger on the surface in contact with the top surface on the front side of the plunger hole to constitute an orifice.

Abstract: A hydraulic tensioning device for a chain drive, having a tensioning piston which is guided in a holder and which, on its outer circumferential surface, has locking grooves, an inner guide which projects into a cavity of the piston, and a locking element which has at least two annular sections and at least two radial extensions, wherein the locking element can be placed in engagement by the at least two annular sections with one of the locking grooves, and having a clamping stop and a sliding stop which are axially spaced apart from one another. To simplify the structural design, the holder has at least two axial extensions which extend in an axial direction between the clamping stop plane and the sliding stop plane, wherein the at least two axial extensions and the tensioning piston do not enclose the at least two radial extensions.

Abstract: A belt tensioning system includes a stretch belt rotationally connected to a crankshaft pulley and an accessory pulley, and a tensioning device including a pivoting arm having a tensioning pulley coupled thereto and an arm stop positioned in a path of the pivoting arm to limit the rotation of the pivoting arm. Additionally, the tensioning device does not include a spring tensioner and is configurable in a tensioned configuration and an un-tensioned configuration.

Abstract: To provide a simple-structured tensioner that generates less knocking noise at the start-up of the engine and that prevents an excessive chain tension, severe friction, noise or vibration during the running of the engine, while also reducing production costs. The tensioner includes a ring control mechanism that controls the position of a resilient ring. The ring control mechanism includes a front-side restricting part having a front-side restricting surface and capable of restricting forward movement of the resilient ring, and a rear-side restriction member having a rear-side restricting surface and capable of restricting rearward movement of the resilient ring. The front-side restricting part is fixed to or formed integrally with the housing. The rear-side restriction member is disposed movable in a front to back direction relative to the housing and the plunger.

Abstract: The present invention pertains to an auto tensioner (1) to be provided in an auxiliary-driving belt system, including a friction member (6) that is sandwiched between an arm (3) and an inner circumferential surface of an outer cylindrical portion (21) of a base (2) in the radial direction of the outer cylindrical portion (21) and that has an arc-shaped surface (60) locked to the arm (2) and slidable with respect to the inner circumferential surface of the outer cylindrical portion (21), in which the friction member (6) is provided so that the arc-shaped surface (60) remains at a height equal to or higher than a horizontal plane (HP) passing through a central axis (R) when sliding with respect to the inner circumferential surface of the outer cylindrical portion (21) as the arm (3) oscillates.

Abstract: A method for producing a high frequency circuit board includes forming an antenna pattern on an upper surface of the provisional substrate. The method includes performing hot-press in a state where a thermoplastic resin and a provisional conductor are stacked on the upper surface of the provisional substrate, to form a first dielectric layer portion covering the antenna pattern. The method includes removing the provisional conductor and shaving the first dielectric layer portion to form a cavity to house an electronic component. The method includes mounting the electronic component on the antenna pattern in the cavity. The method includes performing hot-press in a state where a thermosetting resin and a ground conductor are stacked at an opening side of the cavity in the first dielectric layer portion, to form a second dielectric layer portion to embed the electronic component in the cavity. The method includes removing the provisional substrate.

Abstract: The tensioning pulley arrangement for a belt drive in an engine, is provided. In one example, the tensioning pulley arrangement includes a first tensioning pulley and a second tensioning pulley tensioning a belt with a spring force and a spring preload force generated by a first spring device coupled to the first and second tensioning pulleys. The tensioning pulley arrangement further includes an intensifying device that decreases belt tension during low belt load conditions and increases belt tension during high belt load conditions. In this way, friction losses during low belt loads may be reduced and belt slippage caused by high belt loads and/or dynamic shifts in belt loads may also be reduced.

Abstract: Provided is a tensioner which can ensure, with a simple structure, both the stability of the installation state of a check valve and the capacity of an oil storage chamber. A tensioner has a plunger, a housing, a check valve, and a coil spring. The plunger has a front-side plunger part having a pressing front end portion, and a rear-side plunger part disposed on the rear side of the front-side plunger part and having a valve movement restricting portion. The check valve is disposed on the rear side of the valve movement restricting portion. The coil spring is disposed so that one end thereof is in contact with a housing bottom portion and the other end thereof is in contact with the rear side of the check valve.

Abstract: A belt tensioner (1) for a belt drive for auxiliary units in an internal combustion engine, including a tensioner housing (2), a tensioner lever (3) and a plain bearing for radially mounting the tensioner lever (3) in the tensioner housing (2) in order to allow the tensioner lever (3) to pivot; a bearing partner associated with the tensioner lever (3) is in sliding contact with a second bearing partner associated with the tensioner housing (2). One of the two bearing partners is suspended in a radially elastic manner on the associated part that supports the bearing partner in a rotationally fixed manner.

Abstract: To simplify a structure and reduce costs. A shoe for a chain guide or for a chain tensioner arm is constructed. Here, a shoe (3) has a chain sliding surface (30) on which a chain slides. A locking protrusion such as a clip, a tab or a hook for locking the shoe (3) to a tensioner arm main body (2) of a chain tensioner arm (1) is not provided on an end surface of the shoe (3) or on a surface on the rear side of the chain sliding surface (30). Furthermore, the shoe (3) has a uniform cross-sectional shape over the whole length and extends linearly in the longitudinal direction.

Abstract: In a shift lever device, a first facing cavity and a second facing cavity of a lever, and a first facing hole and a second facing hole of a printed wiring board, respectively face each other when the lever is disposed in an “H” position. Thus, in a state in which the lever is disposed in the “H” position when the shift lever device is being assembled, the first facing cavity and the second facing cavity respectively face the first facing hole and the second facing hole, thereby enabling the accuracy of relative assembly positions of a magnet of the lever and detection elements of the printed wiring board to be increased, and enabling the detection accuracy of a shift position of the lever to be improved.

Abstract: The invention provides a simple-structured tensioner lever capable of suppressing deflection of a stopper member and allows smooth assembly of the tensioner lever into an engine. The tensioner lever includes a stopper member for locking a coil spring, this stopper member including: a stopper pin portion inserted into a pin hole; a stopper front side extension portion continuous with one end of the stopper pin portion and protruding toward a base front surface; a stopper rear side extension portion continuous with the other end of the stopper pin portion and protruding toward a base rear surface; a spring lock portion formed in the stopper rear side extension portion and making engagement with a spring support arm; and a stopper movement restricting portion making engagement with the spring support arm to restrict movement of the spring support arm in a direction away from the base rear surface.

Abstract: Provided is a simple-structured tensioner that can reduce the processing and assembling workload. A tensioner 10 includes a plunger 20, a housing 30, a main spring 60, and a relief valve 40. The relief valve 40 includes a seat member 41, a valve member 42, and a relief spring 43. The plunger 20 includes an outward relief passage 23, and a bottom protrusion 22a protruding rearward integrally with and continuously from a plunger bottom 22. The relief spring 43 is disposed such that one end thereof is in contact with the valve member 42 while the other end is attached to the bottom protrusion 22a.

Abstract: An object of the present invention is to provide a chain tensioner that allows a necessary and sufficient amount of oil to be fed during restart following a long stoppage of oil feeding and that maintains a proper pressure, thus preventing possible noise and vibration. An oil storing chamber 123 is formed inside a plunger 120 and forward of a check valve 150 in a protruding direction of the plunger 120. A tensioner body 110 has an oil feeding hole 114 through which a cylindrical surface portion 113 of a plunger housing hole 111 communicates with an outside and a high-pressure discharge hole 115 through which a pressure oil chamber 101 in the plunger housing hole 111 communicates with the outside. A relief valve 160 that is opened under a high pressure is provided in the high-pressure discharge hole 115 and closer to the pressure oil chamber 101.

Abstract: A chain guide includes a guide base pivotable about a fulcrum shaft. The fulcrum shaft is between a roller bearing located at an end portion of the guide base, which is closer to the fulcrum shaft, and the center of the guide base in the longitudinal direction of the guide base such that the roller bearing is outside of the fulcrum shaft.

Abstract: A chain guide includes a curved guide base extending along the direction in which a torque transmitting chain moves. The guide base includes, on its surface opposed to the chain, a rolling guide portion including a plurality of roller element bearings which are rotatable and configured to guide the chain while kept in rolling contact with the chain, and a sliding guide portion in the form of a curved surface. The rolling guide portion reduces a loss in torque transmission, while the sliding guide portion reduces flapping of the chain, thus reducing noise and vibrations of the chain.

Abstract: A compliant tensioner arm assembly including an arm, an elastically deformable body disposed on a surface of the arm, and a sliding surface disposed on the elastically deformable body is disclosed. The elastically deformable body allows the sliding surface to yield to a load condition of the sliding surface so that the sliding surface yields to the load condition.

Abstract: An injector head used in coiled tubing systems including at least two opposed counter-rotating chain loops having a first end and a second end, the chain loops having a chain. The injector head further includes a fixed drive sprocket disposed at the first end of a chain loop and a floating sprocket disposed at the second end of the chain loop. In the injector head, there is a force applied to the floating bottom sprocket to maintain the chain loop at a desired chain tension. Additionally, the injector head includes a tension cylinder that automatically maintains the chain loop at the desired chain tension.

Abstract: A tension mechanism for a robotically-controlled medical device measures the tension applied to an actuation tendon to provide feedback to a robotic controller. In one embodiment, the device comprises an elongated instrument, an elongated member, and a base. The elongated member is coupled to the distal end of the elongated instrument, configured to actuate the distal end of the elongated instrument in response to tension in the elongated member. The base is located at the proximal end of the elongated instrument, and comprises a first redirect surface that redirects the elongated member. The first redirect surface is coupled to a lever element that is configured to exert a reactive force on a sensor in response to tension in the elongated member.

Abstract: In an aspect, a tensioner for an endless drive member, comprising a shaft and base that are mountable to be stationary relative to an engine, a tensioner arm that is pivotable relative to the shaft about a tensioner arm axis, a pulley on the tensioner arm rotatable about a pulley axis that is offset from the tensioner arm axis, and that is engageable with an endless drive member, a tensioner spring that is positioned to urge the tensioner arm towards a free arm position, a damping element that engages the tensioner arm and that is engaged by a plurality of axially spaced segments of the tensioner spring.

Abstract: A machine navigation system includes a monitoring mechanism for monitoring configuration of an implement movable between configurations relative to a frame such that a center of mass of the machine moves in response to the moving of the implement. A second monitoring mechanism monitors track speed in the machine. A location of an origin of the track speed varies based upon location of the center of mass. A control unit is coupled with the monitoring mechanisms and structured to determine a control term for compensating for movement of a reference location on the machine relative to the track speed origin. The control unit further calculates velocity based on the track speed and the compensatory control term.

Abstract: A tensioning system including a base and an arm pivotally coupled to the base, the arm having an engagement surface and being configured to pivot relative to the base about a pivot axis. The system further includes a biasing mechanism operatively coupled to the arm to bias the arm relative to the base, and a seal assembly sealingly positioned between the arm and the base. The seal assembly is coaxial with the pivot axis and configured to accommodate relative axial movement between the base and the arm and relative radial movement between the base and the arm while still maintaining a seal therebetween.

Abstract: A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl.

Abstract: A tensioner force assembly is provided for applying tension to an engine timing chain that changes the direction of the force acting on a chain tensioning arm such that the tensioner piston is oriented in parallel with the long axis of the crankshaft. The tensioner assembly includes a crankshaft sprocket attached to the crankshaft, a cam shaft sprocket attached to the cam shaft, and a timing chain engaging the sprockets. A timing chain tensioner is pivotally attached to the engine block. A chain tensioner mechanism is provided that takes up timing chain slack. The chain tensioner mechanism includes a pivotable force transfer mechanism, a cylinder body having a long axis parallel to the long axis of the crankshaft, and a reciprocating tensioner piston in the body and engaged with the transfer mechanism for moving the transfer mechanism to apply required tension to the timing chain through the timing chain tensioner.

Abstract: A cleaner head comprising a main body rotatably coupled to a neck, and a locking arrangement operable to permit rotation of the main body relative to the neck when the cleaner head is positioned on a surface and to prevent rotation of the body relative to the next when the cleaner head is lifted off a surface. The locking arrangement therefore stops the cleaner head from rotating undesirably when the cleaner head is lifted away from a cleaning surface.

Abstract: A spring, especially for use in a belt tensioning device, with a number of at least 1.25 and at a maximum 2.5 coils, which extend around a spring axis A8, wherein a first coil end 42 has an axial offset Va relative to a first coil region 48, arranged at an angle of 360° around the spring axis A8, and wherein a second coil end 49 has an radial offset Vr relative to a second coil region 50 arranged at an angle of 360° around the spring axis A8. A belt tensioning device and an assembly with such a belt tensioning device include such a spring.

Abstract: A power transmission system transmits power from an internal combustion engine to a first and a second auxiliary device through an endless transmitting member. Prior to issuing of an engine start request, the first auxiliary device is actuated to move a tensioner pulley to a given position to increase the degree of tension of the endless transmitting member. The actuation of the first auxiliary device as an engine starter upon the issuing of the engine start request, therefore, enables a drive shaft of the engine to be rotated immediately within a required time to crank the engine. This achieves a quick start of the engine and results in a decrease in amount of time between the issuing of the engine start request and the actual start of the engine.

Abstract: A tensioner comprising a piston slidably received within a piston bore of the housing having a plurality of grooves formed on an outer circumference, the piston forming a first pressure chamber with the piston bore. The tensioner uses a mechanism to remove a sliding pawl or expandable clip from engaging the grooves on the piston, such that the piston can move towards the housing and reduce chain load when fluid pressure is reduced in the first pressure chamber during engine shutdown, but not so much as to leave the chain uncontrolled during engine restart. The mechanism may for example be a fluid biased spool piston which engages the expandable clip or a pawl piston that engages a sliding pawl.

Abstract: To provide a chain tensioner that has a simple structure, is universally usable and capable of supplying sufficient and necessary oil when restarted after a long time after the stop of oil supply, and enables reduction of its length and size. Urging unit 140 provided in an oil pressure chamber 101 to be extendable and contractible urges a plunger 120 outward from a plunger bore 111 in a tensioner body 110 of the chain tensioner 100. A connection groove 122 is formed in the outer circumference of the plunger 120 to form a supply chamber 102. An oil reservoir chamber 123 is formed inside the plunger 120. A leak groove 125 is formed in the outer circumference of the plunger 120 on the side of the oil pressure chamber 101 such as to extend into the supply chamber 102.

Abstract: In one aspect, the invention relates to a tensioner that is capable of precognitively anticipating when it is desirable to increase the tension in a belt or other endless drive element so as to prevent belt slip prior to events that would raise the risk of it.

Abstract: In a ring-type tensioner, a resilient ring that cooperates with external grooves formed on a plunger to restrict retracting movement of the plunger in a tensioner housing, is formed with manipulation parts that extend through a cut-out portion in the housing and have bulged portions that are spaced by gaps from opposed walls of the cut-out portions. A rod-shaped tool inserted into one of the gaps cooperates with the bulged portion and the wall on opposite sides of the gap to expand the ring. The manipulation parts can be formed with tool-holding portions.

Abstract: In a tensioner having a housing and a plunger protruding in an advancing direction from a plunger-accommodating hole formed in the housing. The plunger has a cylindrical outer wall for sliding contact with the wall of the plunger-accommodating hole, and a tapered the rear end wall. A small clearance between the cylindrical outer wall of the plunger and the wall of the plunger-accommodating hole allows the plunger to become inclined by a small amount, which increases as the plunger advances. The angle of the taper at a boundary where the end wall meets the cylindrical outer wall is substantially equal to the maximum inclination of the plunger when the plunger is in its fully advanced condition.

Abstract: An apparatus (10) for imparting tension to multiple strands of an endless power transferring member loop (12) encircling a drive sprocket (14) and at least one driven sprocket (16a, 16b). Two tensioning arms (18a, 18b) are spaced apart and have guided movement relative to at least one fixed pin (26), and support inwardly facing shoes (20a, 20b) with power-transferring-member-sliding faces (22a, 22b). A link assembly (60) includes at least two link members (32a, 32b) pivotally connected to one another at respective first ends (40a, 40b). The connected first ends (40a, 40b) are constrained for limited movement along a fixed slot (36) extending generally along a centerline of the power transferring member loop (12) between the drive sprocket (14) and the driven sprockets (16a, 16b). The link members (32a, 32b) are pivotally connected individually to opposite ends of the two spaced apart tensioning arms (18a, 18b) at second locations (42a, 42b).

Abstract: A tensioner for an engine accessory drive system includes a tensioner arm pivotally mounted for movement between a free arm position and a load stop position. The tensioner arm includes a pulley which engages a belt. A piston, disposed in a cylinder, is pivotally linked to the tensioner arm. A spring urges the tensioner arm towards the free arm position. A moveable load stop member, controlled by an actuator, projects into the cylinder. The load stop member abuts the piston to thereby arrest movement of the tensioner arm and define the load stop position. The actuator may drive the load stop member against the piston to move the tensioner arm towards the free arm position so as to increase belt tension.

Abstract: A tensioner having a simplified structure, using engaging teeth having increased strength and reduced backlash, constructed from a reduced number of parts, reduced in cost, and having increased design freedom. A tensioner comprises: a tubular member (1) having engaging teeth (1b) formed thereon; one or more engaging elements (2) having formed thereon engaging teeth (2a) engaging with the engaging teeth (1b); and a shaft member (3) provided inside the tubular member (1) and having an engaging-element receiving section (3c) or an engaging-element supporting section which receives the engaging elements (2) of the tubular member (1). Either the tubular member (1) or the shaft member (3) functions as an advancing member which is moved by urging force in an advancing and retracting manner.

Abstract: In one aspect the invention relates to a tensioner that is capable of precognitively anticipating when it is desirable to increase the tension in a belt or other endless drive element so as to prevent belt slip prior to events that would raise the risk of it.

Abstract: Aspects of the present invention generally provide tensioner for varying tension applied to a continuous drive member based on temperature changes. In one embodiment, a temperature compensating chain tensioner is provided. The temperature compensating chain tensioner includes a fixed support member, a first idler sprocket coupled to the fixed support member, a support arm having a proximal end pivotably coupled to the fixed support member, a second idler sprocket coupled to a distal end of the support arm, and a spring form coupled intermediate of the fixed support member and the support arm, wherein the spring form has a spring constant that increases with increasing temperature, which causes the distal end of the support arm to move relative to the fixed support member.

Abstract: An auto-tensioner includes a plunger slidably inserted in a cylinder and having a closed front end protruding from the cylinder and an open rear end which is located in the cylinder. The plunger is formed with an internal thread on its inner periphery. A screw rod having an external thread formed on its outer periphery thereof and inserted in the plunger with its external thread in threaded engagement with the internal thread of the plunger. The screw rod has a rear end protruding from the open rear end of the plunger. A seat member is mounted in the cylinder and in abutment with the rear end of the screw rod. A return spring having one end thereof supported by the screw rod biases the plunger outwardly of the cylinder to press the closed front end of the plunger against a chain or a belt. An elastic member which is compressible in the axial direction of the cylinder supports the seat member.

Abstract: The present disclosure relates to a chain drive assembly for a work machine, in particular for a crawler-mounted crane or a crawler excavator, having a drive crawler track, at least one displaceably supported sprocket wheel, in particular a guide wheel or idler wheel, and at least one tensioning device to tension the crawler track, wherein at least one abutment is provided which bounds the displacement of the displaceably supported sprocket wheel. The present disclosure further relates to a work machine, in particular to a crawler-mounted crane or a crawler excavator, having such a chain drive assembly.

Abstract: A tensioning device for compensating for elongations of the traction mechanism, in particular a chain or a timing belt, of a power transmission drive, in particular on an internal combustion engine, having a tensioning mechanism, in particular a tensioning rail, a sliding shoe or tensioning arm having a tensioning roller. A tensioning element is disposed between a support surface on the tensioning mechanism and a support, in particular on the internal combustion engine, and the support surface on the tensioning mechanism is made of a material which has a high strength.

Abstract: A belt tensioner includes a support housing at least in part defining a spring cavity and an arm pivotally attached to the support housing. A spring is located in the spring cavity and is operatively connected to the arm and the support housing to bias the arm about a pivot axis toward an unloaded position relative to the support housing. A damping member includes a hub and deflectable, force-applying elements that are connected to and spaced apart about a periphery of the hub. The force-applying elements are biased toward a contact surface of the arm to apply a frictional force between the contact surface and the force-applying elements to impede rotation of the arm relative to the support housing.

Abstract: A tensioner for a chain or similar power transmission medium comprises a spring-biased plunger having annular rack teeth with gradually sloping forward surfaces and steeper rearward surfaces. The teeth are engaged by radially movable balls received in inclined grooves in an axially movable annular ball seat disposed in an annular groove formed in the wall of a plunger-accommodating hole in a tensioner housing. The bottoms of the inclined grooves face a steep rearward surface of a rack tooth, and the annular ball seat is axially movable in the annular groove and biased in the plunger protruding direction by a spring that exerts a biasing force greater than the biasing force exerted on the plunger. The balls and the movable annular ball seat block retraction of the plunger on engine start-up, but permit retraction when excessive force is imparted to the plunger while the plunger is in a protruding condition.

Abstract: Disclosed is an assembling method for a timing system of an engine to wind a timing chain (30) around a sprocket (20) attached to a crankshaft (18) and a sprocket (24, 28) attached to a camshaft (22, 26).

Abstract: A printing apparatus comprises a print head moving module comprising a mounting plate, a first wheel, a second wheel, an endless belt, a retaining member of the mounting plate to clamp with the second wheel; an adjusting device comprising a positioning member of the mounting plate, a driving member of the positioning member comprising an indicating block, a moveable member of the positioning member abutting the retaining member, the moveable member comprises a receiving portion having graduations; the indicating block is through the positioning member in the receiving portion; a resilient member in the receiving portion between the driving and the moveable members; wherein the driving member drives the moveable and the retaining members from a first to a second position, in the first position, the indicating block is away from a predetermined graduation; in the second position, resilient member deformed, the indicating block is at the predetermined graduation.

Abstract: A hydraulic tensioner includes an inlet portion which defines a pressurized fluid inlet. The hydraulic tensioner also includes a housing defining a chamber which is coupled to the inlet portion. A band check valve separates the pressurized fluid inlet from the chamber, and a piston slideably engages the housing. A method of manufacturing the hydraulic tensioner is also disclosed.