Abstract: A belt tensioner mounted on mounting structure in normal and reverse modes which comprises a hub structure. An arm structure is pivotally mounted on the hub structure for pivotal movements with respect thereto about a pivot axis central to the hub structure between first and second limiting positions. A belt-engaging pulley is rotatably mounted on the arm structure for rotational movement about a rotational axis parallel with the pivotal axis. A spring system is provided for resiliently biasing the arm structure away from the first limiting position and toward the second limiting position. The hub structure includes a central opening extending axially therethrough configured to allow a mounting bolt to extend therethrough and into secured relation to the mounting structure. The hub structure includes a normal mode mounting plate on one axial end thereof which engages the mounting structure when the mounting bolt is secured therein as aforesaid.

Abstract: The invention comprises a tensioner having an inner race rotation idler pulley. The pulley having a web and a belt bearing surface connected to the web. The web is attached to an inner race of a bearing by a fastener. The pulley may be stamped out of sheet metal or of spun metal and may have a central hole for alignment with the central axis of the bearing. The outer race of the bearing is mounted to a pivot arm. The pivot arm comprises as least two pivot points for pivotably attaching the pivot arm to a mounting plate and a biasing member. The pivot points are contained within a periphery of the pulley. The biasing member urges the pivot arm and pulley against a belt to be tensioned.

Abstract: A combination starter-generator system for use in a vehicle is provided. The vehicle has an internal combustion engine and a battery. The system includes a starter-generator electrically coupled to the battery to generate a current and to start the internal combustion engine. A drive mechanism connects the starter-generator machine and the internal combustion engine. The starter-generator machine generates the current by receiving a charging torque from one side of the drive mechanism and starts the internal combustion engine by imparting a starting torque to a different side of the drive mechanism. The charging torque or the starting torque is a greater torque. A passive tensioning system cooperates with the drive mechanism to tension the drive mechanism only at the side of the greater torque.

Abstract: A quiet drive device for motor vehicle sliding sunroofs is proposed capable of withstanding even strong drive forces and permitting an equal, that is to say, smooth displacement of a cover of the motor vehicle sliding sunroofs. The drive device comprises a toothed belt, which is guided so that two parallel line sections are formed on the toothed belt. On the running line sections the toothed belt, with an external toothing extending without interruption over its outer circumference, is in meshing engagement with two drive cables for a cover. An internal toothing extending without interruption over the inner surface of the toothed belt is in meshing engagement with a toothed pinion that can be driven to rotate in both directions and is partially wrapped by the toothed belt.

Abstract: The invention comprises a conveyor device 1, provided with a turning station (3) and a supply belt for supplying products to the turning station in a direction of conveyance with a first orientation. The turning station comprises a cam belt (20) that is rotatable in a closed loop and has cams (28) placed at regular intervals, and also a retaining element (26), for retaining products during the transition from the first track part (24) to the second track part (25). The cams on the belt (20) and the retaining element (26) ensure that at high speeds the products are positioned in an accurate manner during the change of direction. The invention also relates to a motor suspension (30). A drive motor (33) and a drive roller for a conveyor belt are suspended from two arms. With the motor suspension, the belt tension and belt orientation can be adjusted in a simple manner, and the motor can be removed in a simple manner for repair or replacement.

Abstract: A transmission assembly has a frame having a through hole, a transmission gear, a driven gear, and a transmission chain surrounding the transmission gear and the driven gear. A torsion spring has a first end and a second end. A swing arm has a round hole, a circular hole, and a through aperture. A shaft rod is inserted in the round hole of the swing arm. The shaft rod passes through the torsion spring and the through hole of the frame. An idle wheel engages with the transmission chain. A bearing is adjacent to the idle wheel. The pivot rod is inserted in the circular hole of the swing arm. The pivot rod passes through the ring and the idle wheel. The first end of the torsion spring is inserted in the through aperture of the swing arm. The second end of the torsion spring is hooked on the frame.

Abstract: A device for tensioning a drive belt extending between a vehicle power source and its driven attachment is provided. The device includes first and second members slideably coupled together and adapted to extend between and operably engage a first powered shaft member and a second shaft member carried on the attachment. A compression spring is coupled with the slideable members for urging them apart and tensioning a belt entrained around pulleys carried on the two shaft members. An overcenter locking structure is provided to secure the spring in its compressed configuration or release the compression and retract the slideable members for removal, adjustment and/or installation. Adjustable stops abutting the ends of the spring permit the level of spring force to be selected for a variety of applications.

Abstract: The invention is an improved belt drive system for a power plant. It is of the type having a crankshaft pulley, an accessory pulley, a motor/generator pulley, a belt tensioner, and a belt tensioner pulley. It also includes a power transmission belt trained about the crankshaft, accessory, motor/generator, and the belt tensioner pulleys. The power transmission belt has spans defined by terminations proximate to each of the pulleys, including intermediate spans beginning at the crankshaft pulley and ending at the motor/generator pulley following the direction of belt travel in normal operation. The first of the intermediate spans has a first termination end proximate the crankshaft pulley. The last of the intermediate spans has a last termination end proximate the motor/generator pulley. It is improved by the tensioner pulley being proximate a termination end of an intermediate span not being either the first termination end or the last termination end.

Abstract: A drive belt tensioning method and assembly using a dual spring tensioner. A pulley from a drive belt/pulley system is mounted onto a pivot arm having a pivot point. A tensioner spring mounts between the machine frame and the pivot arm, such that is causes rotation of the pivot arm about the pivot point in the opposite direction that the belt/pulley system causes rotation about the pivot point. A stop is used to keep the pivot arm in the position of tensioner spring/belt/pulley system equilibrium. This stop is mounted to the machine frame after the pivot arm equilibrium is reached. A retainer spring mounts between the machine frame and the pivot arm such that when in tension it causes a rotational force about the pivot point in the same direction that the tensioner spring causes a rotational force about the pivot point.

Abstract: A tensioning device for a chain or a belt drive for a motor of a hand machine tool, especially for a chain saw or a grinding or abrasive cutting-off machine, with a longitudinally movable bracket, such as a bracing or an arm, which can be fixed together with a cover with at least one bolt with a screwable nut to a casing or to another part of the hand machine tool, whereby the tensioning device has an adjusting screw extending in the longitudinal direction of the bracket on which a rider screw is movable to-and-fro by rotating the adjusting screw, the rider screw having a trunnion extending through an opening of the bracket so that, for tensioning the chain or the belt drive, the bracket follows a movement of the rider screw.

Abstract: A belt tension mechanism for tensioning an associated belt drive system on an associated vehicle is provided. The associated belt drive system includes a double stacked pulley, a first belt for providing power from a power mechanism to the double stacked pulley and a second belt for providing power from the double stacked pulley to an associated implement. A first tensioning mechanism is provided for tensioning the first belt and a second tensioning mechanism is provided for tensioning the second belt. A tension arm selectively simultaneously tensions the first and second belts from an inoperative condition to an operative condition or from an operative condition to an inoperative condition. A balancing mechanism is also provided for balancing tension on the first and second belts as the implement is selectively height adjusted.

Abstract: A belt tensioner includes a stationary bracket mounted at the front of an engine and a pivotal arm operatively connected to the bracket and forming a plurality of channels with respective supporting surfaces of the bracket. The channels receive a plurality of bushings so as to increase an overall supporting surface of the belt-tensioner.

Abstract: The drive-chain tensioner is automatically self-adjusting. A chain-slipper is guided to follow wear-movement of the chain. A cam is mounted on the follower. If slack in the chain increases, the cam is rotated by a cam spring to a position in which a larger radius of the cam lies under the follower. The cam provides a solid abutment that prevents the chain from compressing the tensioning springs and becoming slack when drive is reversed. For compactness and good load distribution, the chain is supported on a saddle between two cams. The cams have ratchet teeth.

Abstract: Disclosed is a tensioner for use in an engine. The tensioner comprises a fixed structure that fixes to the engine. A movable structure is mounted for movement relative to the fixed structure in a belt tensioning and opposite directions. A pulley member has a belt engaging surface that engages with the belt. One of the fixed and movable structures has an interior surface defining a fluid chamber containing fluid and the other includes a chamber dividing structure. The chamber dividing structure defines first and second chamber portions on opposing sides thereof. A biasing element biases the movable structure in the tensioning direction to tension the belt. Relative movement of the movable structure in the tensioning direction displaces fluid from the first to the second chamber portion and increases fluid pressure in the first chamber portion and decreases fluid pressure in the second chamber portion, and the reverse occurs during movement of the movable structure in the opposite direction.

Abstract: A belt tension mechanism for tensioning an associated belt drive system on an associated vehicle is provided. The associated belt drive system includes a double stacked pulley, a first belt for providing power from a power mechanism to the double stacked pulley and a second belt for providing power from the double stacked pulley to an associated implement. A first tensioning mechanism is provided for tensioning the first belt and a second tensioning mechanism is provided for tensioning the second belt. A tension arm selectively simultaneously tensions the first and second belts from an inoperative condition to an operative condition or from an operative condition to an inoperative condition. A balancing mechanism is also provided for balancing tension on the first and second belts as the implement is selectively height adjusted.

Abstract: An auto tensioner comprising a support shaft whose one end is fixed to a target attaching object and which has an arm support portion, an arm whose one end is rotatably supported by the arm support portion of the arm and which has a pulley support portion projecting fowardly and axially beyond the top end of the support shaft, a tension pulley which is rotatably supported by the pulley support portion of the arm and arranged at a position offset from the support shaft and a friction plate arranged between one end of the arm and the arm support portion of the support shaft and adapted to apply a rotary resistance to the arm. Further, the friction plate is provided with a load bearing member in its zone where a load resulting from the offset arrangement of the tension pulley is applied whereby the zone of the friction plate can have a sufficient degree of load-resistant property.

Abstract: A tensioner for traction elements such as belts and chains comprises a tension lever (2) on which is arranged a tension roller (3) for the traction element. A mounting lug (5) of the tension lever (2) is pivoted by a radial bearing (13) on an axle (6) provided on an engine block (4), while axial stops (8) are arranged on both ends of the mounting lug (5). The tensioner further comprises a tension spring element (1) which acts at one end on the tension lever (2) and at a second end on the engine block. To prevent rattling noises which result from axial displacements of the tension lever (2), the invention provides the arrangement of sealing rings (12) on the two axial ends of the mounting lug (5), which sealing rings (12) seal the radial bearing (13) at its front ends while projecting axially beyond the end surfaces of the mounting lug (5), the axial distance between the axial stops (8) being larger than the axial distance between the end surfaces of the sealing rings (12).

Abstract: To provide a belt-drive mechanism wherein the tension degradation of the circular belt and slips of the dviving pulley are prevented, and a precise tension adjustment of the circular belt is enabled aw well, a belt-drive mechanism, having a fixed pulley (24), an adjust pulley (26), a circular belt (25), and an adjustment assembly (41) for adjusting distance between the fixed pulley (24) and the adjust pulley (26) by shifting position of the adjust pulley (26), comprises a pair of fastening members (32) for fixing the distance after the distance is adjusted. The adjustment assembly (41) comprises: a coupling member (31) having a screw hole (30); a pair of elastic members (32) for tensioning the shaft (27) outward of the circular belt (25); and an adjusting screw (29) set through a hole of another supporting face (28) to be screwed into the screw hole (30) of the coupling member.

Abstract: A slide idler for a chain drive wherein the idler is provided with easily replaceable and rotatable bushings. The slide idler comprises two elongated members, each elongated member is provided with two inwardly extending polygonal mounting assemblies. Two cylindrical bushings having polygonal apertures corresponding to the polygonal mounting assemblies are mounted to these mounting assemblies and are sandwiched between the elongated members. A split pin is used to hold the slide idler together.

Abstract: Stretcher for a transmission belt comprising a fixed part suitable for being rigidly connected to a support structure and provided with a pin defining a first axis, a movable part comprising a hub rotating on the pin about the first axis, a pulley carried by the movable part and rotating with respect thereto about a second axis distinct from the first axis and parallel thereto, and a spiral spring interposed between the fixed part and the movable part and suitable for loading in use the movable part in the direction tending to keep the pulley in engagement with the relative belt. The spring has an internal end secured to the pin, and an external end secured to the hub, and is interposed between two bushes which support the hub on the fixed part and are provided with respective flanges cooperating axially with the spring.

Abstract: A tensioner for belts and chains having a housing (1) in which a cylinder (3) containing a slidably guided piston (4) is arranged which piston (4) is supported radially by a guide bush (5), one end of a compression spring (13) engaging the piston (4), while the other end thereof engaging a cylinder base (6) of the cylinder (3), which cylinder base (6) is axially supported on a housing bottom (9) by a self-adjusting bearing (10) whereby, to improve the correction of alignment errors between the cylinder (3) and the piston (4), a plurality of peripherally adjacent raised portions (10) made of a ductile material are arranged between the housing bottom (9) and the cylinder base (6) and are plastically deformable under loading by the spring-loaded cylinder base (6).

Abstract: A tensioner with a base, a pivot-arm that oscillates about a pivot secured to the base, a pulley attached to the pivot-arm, a compression spring with a first end operatively connected to the pivot-arm and a second end operatively connected to a shoe that presses a convex surface of the shoe against a concave arcuate surface of the pivot-arm, to the shoe held in place against a protuberance secured to the base by a balance of forces.

Abstract: A tensioner with a base, a pivot-arm that oscillates about a pivot secured to the base, a pulley attached to the pivot-arm, a compression spring with a first end operatively connected to the pivot-arm and a second end operatively connected to a shoe that presses a convex surface of the shoe against a concave arcuate surface of the pivot-arm, and a second pivot-arm secured to the shoe and a second pivot secured to the base.

Abstract: A belt tensioner for tensioning a drive belt or timing belt comprises an eccentric adjusting member having an end surface thereof constructed and arranged to be mounted directly in surface-to-surface engagement with respect to a belt tensioner mounting surface for an engine frame. A pivoted structure is mounted on the eccentric adjusting member for pivoted movement between a first position and a second position, and a belt tensioning pulley is mounted for rotational movement on the pivoted structure.

Abstract: An auto-tensioner has an arrangement wherein a pivoting member rotatably supports a pulley in contacted relation with a belt and is pivotally biased by a spring for pressing the pulley against the belt. A bracket is press fitted around the outer periphery of the pivoting member and one end of the spring is locked to the bracket. A first fit portion disposed at the pivoting member and a second fit portion disposed at the bracket are fitted with each other for restriction of a relative rotation between the pivoting member and the bracket.

Abstract: A centrifuge includes an elastically supported centrifuge basket, a drive unit, and an endless drive arrangement, such as a drive belt arranged on a drive pulley of the drive unit and a driven pulley of the centrifuge basket support unit, for driving the centrifuge basket. A tension relieving device is provided for relieving or counteracting the tension forces of the endless drive arrangement. Thus the elastic supporting members of the centrifuge basket support unit are not stressed by the tension forces of the endless drive arrangement, and the tension relieving device can be pre-stressed so that the basket is in a neutral position during operation. For pre-stressing the tension relieving device, it includes an elastic thrust element, such as a compression spring packet, in addition to a length adjustable strut. To avoid tilting moments, the tension relieving device is arranged in a plane of the endless drive arrangement between the two pulleys.

Abstract: Irregularities on the face of the pulley groove of the pulley for driving the rotor shaft of the generator through the one-way clutch are positively extended and a frictional force between the face and the belt is increased, so that a higher torque than the drag torque can be transmitted to the one-way clutch without causing a slippage of the belt. Since no slippage occurs on the belt, the belt life can be extended. Since the one way clutch is positively operated, the inertial energy of the rotor can be effectively recovered.

Abstract: An auxiliary chain tension system for a rear derailleur in a bicycle, the auxiliary chain tension system being composed of: an elongated member having two opposed ends, one end being formed to secure the member in a fixed position relative to the rear wheel fork of the bicycle so that the other end extends rearwardly from the rear wheel fork, the other end of the elongated member being formed to retain; a spring retention member securable to a pulley shield of the derailleur; and a tension spring having a first end connectable to the other end of the elongated member and a second end connectable to the spring retention member for imposing an auxiliary tension force on the bicycle drive chain.

Abstract: A tensioner with a pivot-arm that is free to move toward a belt of a belt drive system to tighten the belt and is also free to move away from the belt a predetermined amount to slacken the belt and adjust belt tension while avoiding tooth jump in extreme torque reversal situations. An adjustable stop is provided to restrict movement of the pivot-arm and inhibit tooth jump as the tensioner pulley moves to slacken the belt.

Abstract: A conveying device for transportation of extended line products such as cables or tubes has tension elements to exert a tension force on at least two tension chain wheels in the direction away from the driving chain wheels. A self-locking wedge prevents the tension chain wheels from moving back and forth. The automatic adjustment of the roller chains reduces wear of the conveying device and prevents speed changes during transportation of the extended line product.

Abstract: An auto tensioner comprises a rocking member the base end portion of which is supported by a fixed shaft so that it can rock freely, and on the tip end portion of which there is a pulley that is freely rotatably supported, a torsional coil spring for applying a resilient force in the rotational direction to the rocking member so that it pushes the pulley onto the belt, a damper device located between the rocking member and a fixed projection located in a base member wherein when the rocking member is turned by the resilient force of the torsion coil spring, the bottom of the damper device and the projection supported by the base member are separated so as to move the pulley quickly, and when the rocking member is turned in the opposite direction, the rocking arm pushes the top end of the damper device, so that the pulley is displaced slowly by the movement of the damper device whereby it does not require much space, and so that it can effectively do away with slack in the belt.

Abstract: A belt grinder includes a base plate mounting a drive motor, belt drive wheel, and belt tensioning idler wheel. A tension arm movably mounted on the base plate is biased to an extended position under a predetermined adjustable bias force to regulate belt tension. Air cylinder and weighted pivot arm embodiments for biasing the tension arm are disclosed. The idler wheel is pivotally mounted on the tension arm for adjusting position of the belt along the axis of the idler wheel. A plurality of grooves in the base plate allow precise securement of various attachments in repeatable alignments. A platen assembly attachment includes a tool rest and belt platen disposed between belt supporting rollers which may be quickly removed from the base plate and reattached in precise alignment without disturbing the adjustment of the tool rest and platen.

Abstract: A photoreceptor apparatus constructed of a photoreceptor belt releasably attached to the surface of a cylindrical mandrel. The photoreceptor belt is preferably attached to the mandrel by means of a slot in mandrel capable of accepting a portion of the belt and retained therein by means of a releasable key.

Abstract: A belt tensioning system for maintaining consistent and constant tension in a serpentine drive system consisting of a series of pulleys and an endless belt interconnecting the pulleys. The tensioning system includes a power spring with an appropriate nominal torque and rate which acts on the idler pulley, and through the idler pulley on the belt, and is suitable to maintain sufficiently constant tension over a broad range of belt length variations and pulley locations while providing damping sufficient to prevent undue pulley oscillation over a broad range of vibration conditions. In one form of the invention, the spring itself is fixed at one end to the prime mover and the other end to a tensioner arm so as to operate on the idler pulley and maintain the belt tension and provide the damping. The hysteresis of the spring responding to pulley movement thus assists in the damping. In another form of the invention additional damping is provided by a spring loaded band brake.

Abstract: An auto tensioner comprises a rocking member the base end portion of which is supported by a fixed shaft so that it can rock freely, and on the tip end portion of which there is a pulley that is freely rotatably supported, a torsional coil spring for applying a resilient force in the rotational direction to the rocking member so that it pushes the pulley onto the belt, a damper device located between the rocking member and a fixed projection located in a base member wherein when the rocking member is turned by the resilient force of the torsion coil spring, the bottom of the damper device and the projection supported by the base member are separated so as to move the pulley quickly, and when the rocking member is turned in the opposite direction, the rocking arm pushes the top end of the damper device, so that the pulley is displaced slowly by the movement of the damper device whereby it does not require much space, and so that it can effectively do away with slack in the belt.

Abstract: A hydraulic tensioner having a plunger slidably fitted in a mounting cavity n a housing and biased in a protruding direction by a spring and fluid. A variable orifice check valve permits fluid to only flow into, and thereby protrude the plunger, but not out of the mounting cavity is disclosed. The variable orifice check valve is accomplished with a cylindrical compression spring in which the spring coils are normally mutually contacting and which has a top spring cap molded directly to an end of the spring and a bottom spring retainer molded directly to the opposite end of the spring. Such a construction reliably secures the top spring cap and bottom spring retainer to the spring. A mechanical no-return capability is provided to the plunger through an internal ratchet positioned within the mounting cavity and constructed from a cylinder having two helical openings which the plunger engages when the plunger experiences sufficient force to be pushed inwardly.

Abstract: A belt tensioner and method of making the same are provided, the tensioner comprising a support for being fixed relative to a belt, a belt engaging arm carried by the support and being movable relative thereto, a spring operatively associated with the support and the belt engaging arm for urging the belt engaging arm relative to the support and against the belt with a force to tension the belt, the support comprising a shaft having a longitudinal axis, the belt engaging arm being rotatably mounted on the shaft, the arm having a bearing surface angled relative to the axis and the support having a bearing surface angled relative to the axis and facing the bearing surface of the arm, and a bushing disposed between the bearing surfaces and in engagement therewith to facilitate movement therebetween and to tend to prevent cocking of the arm on the shaft when the belt engaging arm is tensioning the belt.

Abstract: A belt tensioning assembly that simultaneously controls belt tension and belt drive speed is provided. A pivotable bracket is pivotably attached to a lawn mower or other light duty, belt driven equipment. A variable speed pulley for holding a pair of rotatable belts is attached to a slide bracket and the slide bracket is slidably attached to the pivotable bracket. A spring or other biasing mechanism can be used to connect the slide bracket to the pivotable bracket to maintain substantially constant belt tension.

Abstract: A pre-adjustable, spring-loadable tensioner for belts or chains, in particular for a control gear of an internal combustion engine, comprising a tension roller (2) mounted on a tension roller support (3) of eccentric configuration which in turn is guided on an eccentric inner component which can be screwed onto a housing (20), the tensioner (1) further comprising a spring (12, 29) resiliently urging the tension roller support (3) against the housing (20), characterized in that the inner component comprises a flanged eccentric bush (5) which engages freely rotatable into a base plate (7) which is guided by a radial guide arm (9) on the housing (20).

Abstract: A belt drive tensioning system for a motor drive positioning system, especially for X-Y digital plotters. The tensioning system employs spring-loading involving pivoting motion of a motor-mounted plate relative to a fixed plate to accurately preset and maintain constant the desired belt tension. A preferred embodiment provides a self-contained modular unit using two pivot bushings interconnecting the two plates.

Abstract: A tensioner for a power transmission belt that is adapted to be operated in an endless path and a method of making the tensioner is provided, the tensioner comprising a support unit for being fixed relative to the belt, a belt engaging unit carried by the support unit and being movable relative thereto, a coiled torsion spring having a first end operatively interconnected to the support unit and a second end operatively interconnected to the belt engaging unit for urging the belt engaging unit relative to the support unit and against the belt with a force to tension the belt, the spring having a certain torque when the belt engaging unit is disposed at a certain position relative to the support unit, the tensioner having changeable structure holding one of the ends in an adjusted position relative to its respective operatively interconnected unit so as to provide for the certain torque of the spring when the belt engaging unit is disposed at the certain position relative to the support unit.

Abstract: A belt autotensioner having a support shaft secured to a pulley support surface of a stationary member. A pulley support is rotatably supported on the support shaft at an offset position. A tension pulley is rotatably supported on the pulley support. A spring coupling member is mounted on the pulley support. A tension adjusting spring is provided to bias the pulley support in a belt stretching direction by exerting a spring force on the spring coupling member. A damper is provided to dampen vibrations transmitted from the belt to the pulley support through the tension pulley. At least one of the spring coupling member and the tension adjusting spring is mounted on the pulley support at a side remote from the stationary member.

Abstract: An autotensioner for a belt has a pulley support shaft secured to a base and an eccentric ring rotatably supported by the pulley support shaft with the center of its outer peripheral surface offset from the center of the pulley support shaft. A pulley is rotatably supported around the eccentric shaft through a rolling bearing. A spring for biasing the eccentric ring is provided to press the pulley against the belt. A damper for imparting resistance to rotation to the eccentric ring is provided to restrain the pivoting motion of the pulley. The resistance to rotation is imparted to the eccentric ring by the damper at the side of the rolling bearing opposite to the base.

Abstract: A belt tensioning device for a belt sander is disclosed in the form of a guided U shaped saddle permitting economies in manufacture associated with external milling of the cantilever extension bar of a small belt sander for use with handheld power tools.

Abstract: A belt tension system for a power tool such as a demolition saw. The system includes a driven gear and a drive gear. The drive gear is orientated perpendicular to the driven gear for more convenience access to adjust the driven gear and, hence, adjust the drive belt. The driven gear can include a second member movably connected to a first member. The second member has a threaded portion and a shaft portion. The first member has helical grooves to interact with the drive gear and a center hole with the second member shaft portion slidingly located therein. The first member can axially rotate the second member when it is axially rotated.

Abstract: An adjusting device for varying a phase angle between a drive shaft and a driven shaft of an endless chain drive extending between a sheet feeder and a printing unit of a printing press and being formed with a tight side and a slack side defining an inner space therebetween includes a first tensioning element for applying a tensioning force outwardly from the inner space against the slack side of the endless chain drive, a second tensioning element for applying a tensioning force outwardly from the inner space against the tight side of the endless chain drive, a slide carrying the first and the second tensioning elements and being displaceable substantially perpendicularly to a plane in which the drive shaft and the driven shaft are disposed, and one additional chain tensioning device for applying a force from outside the endless chain drive against the slack side thereof, the additional chain tensioning device being adjustably movable with respect to the first tensioning element.

Abstract: A tensioner for a power transmission belt that is adapted to be operated in an endless path and a method of making the tensioner is provided, the tensioner comprising a support unit for being fixed relative to the belt, a belt engaging unit carried by the support unit and being movable relative thereto, a coiled torsion spring having a first end operatively interconnected to the support unit and a second end operatively interconnected to the belt engaging unit for urging the belt engaging unit relative to the support unit and against the belt with a force to tension the belt, the spring having a certain torque when the belt engaging unit is disposed at a certain position relative to the support unit, the tensioner having changeable structure holding one of the ends in an adjusted position relative to its respective operatively interconnected unit so as to provide for the certain torque of the spring when the belt engaging unit is disposed at the certain position relative to the support unit.

Abstract: An apparatus for transporting and tracking a belt arranged to move in a predetermined path and controlling lateral movement of the belt from the predetermined path includes a stationary non-rotating arcuate tracking shoe with a belt defining surface for supporting a belt including vertically oriented flanges at each side of said path defining surface and extending from said path defining surface outwardly to provide belt edge guides. An unconstrained slip belt is positioned between the tracking shoe and the belt. When driving the belt around the tracking shoe the velocity of the belt in the axial direction of the tracking shoe is zero when the belt touches an edge guide. Therefore, the friction force acting on the belt from the tracking shoe in the axial direction approaches zero, which helps to keep the total system force applied at the edge guide less than the minimum force necessary to produce buckling of the side of the belt.

Abstract: A tensioner with a pulley rotatably mounted to a pivot arm that is biased with a spring means, the pivot arm includes a leg extension for inhibiting movement of the arm with a damping means.

Abstract: A belt tensioner and method of making the same are provided, the tensioner comprising a support for being fixed relative to a belt, a belt engaging arm carried by the support and being movable relative thereto, a spring operatively associated with the support and the belt engaging arm for urging the belt engaging arm relative to the support and against the belt with a force to tension the belt, the support comprising a shaft having a longitudinal axis, the belt engaging arm being rotatably mounted on the shaft, the arm having a bearing surface angled relative to the axis and the support having a bearing surface angled relative to the axis and facing the bearing surface of the arm, and a bushing disposed between the bearing surfaces and in engagement therewith to facilitate movement therebetween and to tend to prevent cocking of the arm on the shaft when the belt engaging arm is tensioning the belt.