Abstract: A video cassette recorder comprises a power transfer apparatus provided with a timing belt, a capstan motor pulley and a driven belt pulley. The capstan motor pulley includes a first contact body fixed to a capstan motor shaft of a capstan motor and adapted to be contacted with the timing belt, a first fixed guide plate integrally formed on one principal plane of the first contact body facing toward the capstan motor, and a first guide cap detachably mounted on the other principal plane of the first contact body, in order to prevent the timing belt from deviating from the first contact body. The driven belt pulley has a second contact body contacted with the timing belt, a second fixed guide plate integrally formed on one principal plane of the second contact body located in a same direction as the first fixed guide plate, and a second guide cap detachably mounted on the other principal plane of the second contact body in order to prevent the timing belt from deviating from the second contact body.

Abstract: The chain guide of the present invention, which will be utilized on the tight side of the chain of an engine system, is designed to reduce the lateral motion of the chain. The chain guide is constructed with raised side rails that taper inward to the center. The slot which guides and controls the chain gradually narrows towards the center.

Abstract: An improved driving force transmitting apparatus for a headphone stereo mechanism capable of reducing the number of parts necessary for transmitting the driving force is disclosed. The apparatus provides an idler engaged to a motor-side gear for increasing a driving force efficiency. The apparatus includes a motor having a drive gear disposed at a central shaft thereof and disposed at the lower surface of a main base, an idler gear intermeshed with the drive gear and having an idler pulley, and a reverse capstan pulley and a forward capstan pulley rotatable by a belt directly connected to the idler pulley of the idler gear.

Abstract: A synchronous belt drive, with a high multiplication ratio for transforming a rotary movement into a translation or rotary movement, has at least two rows of teeth with different pitches interconnected by a toothed belt. The rows of teeth with different pitches engage wheels of at least one pair of wheels secured against independent rotation. The products of the number of teeth of the wheels and the pitch of the corresponding row of teeth differ at least slightly from each other. The pitch difference between the toothed belts gives the drive a high multiplication ratio. Very fine gradations and therefore high multiplication ratios may be achieved, even when the tooth modulus is high for reasons of resistance.

Abstract: A drive arrangement includes an endless flexible drive element which cooperates with a pulley of variable effective diameter having two sheave members and a drive ring between the sheave members and able to run eccentrically when the sheave members move apart. The drive arrangement also includes a stabilising member for cooperating with the drive ring so as to maintain the axis of rotation of the drive ring at least substantially parallel to the axis of rotation of the sheave members.

Abstract: A chain guide mounting assembly for reducing chain related noise in a chain driven overhead cam internal combustion engine. The assembly includes vibration isolation means for mounting the chain guide to the engine. Resilient members, fitted within the chain guide, provide the vibration isolation, which, in turn, reduces undesirable chain noise. To prevent undue lateral movement of the chain guide member as a result of the chain force exerted thereon, a rigid sleeve in interference engagement is fitted within bores of the resilient members. As a result, a preload is provided on the resilient members so as to reduce the amount of undesirable lateral movement.

Abstract: A power transfer system is disclosed having a drop box for connecting a motor vehicle's drivetrain to an offset driveline. The drop box has an input that is angled relative to its output by means of a constant velocity (CV) universal joint. More specifically, a first rotary member is coupled for driven rotation about the rotary axis of the transmission output shaft while a second rotary member is supported for rotation about a second rotary axis that is angled relative to the first rotary axis. A CV joint drivingly interconnects the second rotary member to the first rotary member. The drop box also includes a third rotary member adapted for connection to the driveline and which is supported for rotation about a third rotary axis that is offset from the second rotary axis. A drive connection interconnects the third rotary member to the second rotary member. The CV joint allows the drop box to be angulated so that a reduced departure angle is achieved with respect to the prop shaft connection.

Abstract: A height adjustable stand for laboratory equipment, in particular for rotary evaporators, possesses a holder arrangement (6). The holder arrangement is able to be displaced vertically on a stand post (5). By way of a motor driven lifting arrangement (9, 11), the holder device (6) can be vertically raised or lowered. A coupling (12) is provided between the holder arrangement (6) and the lifting arrangement (9, 11) for the powered connection and its release.

Abstract: An infinitely variable ratio drive mechanism consisting of at least one variable diameter pulley and a flexible drive belt. A plurality of pulley segments are connected via links to a hub, such that their concerted arcs of motion describe a variable pulley diameter, the segments being biased one to another by resilient force. When two pulleys operate together, the effective diameters of both are adjusted in like direction. The drive pulley diameter is the resultant of a balance between the drive belt force exerted on the individual segments and the opposing resilient force. The plurality of belt engaging members describing the driven pulley adjust opposite the first, their position being actuated in the direction of belt force and restricted by belt length.

Abstract: A belt drive transmission is disclosed which comprises a first gear, a second gear and a belt. The preferred embodiment is for a bicycle transmission which employs a plurality of gears in place of said first and second gears and employs a derailer to move the belt among selected gear ratios. A novel design of gears and a derailer permits the transmission to employ lighter materials thereby reducing the overall weight associated with a transmission.

Abstract: Drive apparatus (2) for a cycle (4), which drive apparatus (2) comprises a frame (6), a motor (8), a first pulley (10) which is driven by the motor (8), a second pulley (12), and an endless belt (14) which passes around the two pulleys (10, 12) and which is driven by the first pulley (10), the drive apparatus (2) being such that during use the belt (14) as in driving engagement with a tire (16) of a wheel (18) of the cycle (4), and the drive apparatus (2) being such that during use the first pulley (10) does not engage the tire (16).

Abstract: A power window mechanism designed to be retrofitted onto the crankshaft of a conventional handcrank operated window opening and closing mechanism includes a motor, a rack with ball-type cogs driven by the motor, a gear driven by the rack, a transmission gear driven by the driven gear, and a separate conversion gear having a central hole shaped to fit onto the shaft and whereby transmit power from the motor to the shaft. The position of the motor is detected by a sensor which generates pulse generated in response to turning of the motor, without the need for an electrical input. The control circuit itself is provided with a processor capable of counting the pulses and controlling the operation of the motor, including its direction, in response to the pulses.

Abstract: A belt transmission mechanism has a crowned drive pulley, a crowned driven pulley, and a belt trained under tension around the crowned drive pulley and the crowned driven pulley. The crowned drive pulley and the crowned driven pulley are dimensioned to satisfy the equation:D2/D1=k.multidot.R1/R2where D1 is the diameter of the crowned drive pulley, D2 is the diameter of the crowned driven pulley, R1 is the radius of the crown of the crowned drive pulley, R2 is the radius of the crown of the crowned driven pulley, and k is a constant which is approximately 1. The belt transmission mechanism with the above drive and driven pulley dimensions can maintain its speed reduction ratio highly accurately even when the tension of the belt varies.

Abstract: A motor driven door drive mechanism is provided having a belt transmission including a flat belt or a round belt which passes around two rotating guide wheels of which at least one is driven to take along the belt. The driven wheel is embodied by a gear and another gear is provided which loosely meshes with the drive gear, partly pressing the belt into the gaps between the teeth thereof. This arrangement offers a sound compromise between the amount of drive force that can be transmitted, and the manufacturing cost and results in low noise level in operation.

Abstract: An adjustment apparatus is disclosed which adjusts the resolution of a pulse encoder. The adjustment apparatus includes at least first and second pulley sets having different pulley ratios and having substantially equal belt perimeters. A pulley belt has a belt circumference substantially equal to the belt perimeters. The pulley belt is transferable from one pulley set to the other so as to adjust the resolution of the pulse encoder.

Abstract: An assembly for guiding different types of inspection and machining apparatuses around permanently installed pipes and shafts in power plants and similar locations. Such assemblies are used for guiding equipment employed in the inspection and machining of elongated objects with a circular cross section around said objects. According to the invention the assembly is mounted around the object by a belt which is tightened between two belt pulleys so as to embrace the object. The belt pulleys are mounted on a body part to both sides of a drive motor that drives both belt pulleys synchronously via gear wheels. The mounting of the assembly on the object to be inspected is extremely rapid.

Abstract: An exerciser driving mechanism generally comprising a driving wheel, a timing belt, a tension wheel, a free wheel, a flywheel, and a wool felt, with which the feeling of "inoperative pedaling" likely happened to the free wheel as experienced in the prior art exerciser upon instantaneously actuating the belt may be eliminated, the gear ratio of driving wheel to free wheel is increased, the contact area of the wool felt with the flywheel is reduced to enhance the speed of inertial rotation in regard to the flywheel, while maintaining the desired friction drag efficiency, thus resulting in an excellent smooth operation.

Abstract: The chain drive described in the present disclosure, instead of using a single sprocket wheel, saves space by making use of two or more sprocket wheels coupled together by slip-free means, each sprocket wheel having only a small number of low sprockets. The number of sprocket wheels, the center-to-center distance between the sprocket wheels, the tip diameter of the sprocket wheels, and the phase offset of the sprockets as between the sprocket wheels which form a set of such wheels are all so matched that one sprocket of one sprocket wheel always engages in the chain in rhythmical sequence, so that all the sprocket wheels rotate smoothly when the chain moves evenly.

Abstract: Disclosed is an actuator having a frame in which a drive source and a slider displaced under the action of the drive source are held, and an actuator arrangement comprising a plurality of actuators connected to each other by connecting devices. A beam member, which constitutes the frame, has a concave portion defined in a side thereof and the drive source is held in the concave portion. A slider base is held in the concave portion and includes the slider displaced along the concave portion. A cover is used to cover the concave portion defined in the beam member. The beam member has grooves defined in respective outer sides thereof, which have substantially T-shaped cross sections and enable other beam members to be mounted to the beam member. The grooves are defined along the longitudinal direction thereof so as to be substantially identical in structure to one another.

Abstract: A drive pulley assembly is disclosed for a conveyor belt assembly which permits a reduction in the overall size of the conveyor assembly without any reduction in the size or width of the conveyor belt. The overall width of the conveyor assembly is reduced by providing recessed end cavities in the ends of the drive pulley to accommodate the mounting brackets for the pulley. In accordance with the present invention, the mounting brackets are secured to the inside of respective frame members and extend therefrom into the recessed end cavities of the drive pulley such that substantially the entirety of the mounting bracket lies within the drive pulley. Because the mounting brackets are contained substantially within the confines of the drive pulley, the drive pulley assembly of the present invention requires less space than conventional conveyor assemblies in which the mounts are disposed beyond the ends of the drive pulley.

Abstract: The friction drive mechanism has first and second wheels with at least one resilient elastomeric friction ring (O-ring) resiliently engaging on the outer peripheral surface of one of the wheels and against the surface of or against another such ring on the surface of the other wheel. The rings are radially compressed, but axially free. Rotation of the driving wheel causes rotation of the driven wheel through frictional engagement of the resilient elastomeric ring.

Abstract: A transmission system comprising at least two wheels and a belt wound around the wheels with an unambiguous transmission ratio in that the transmission system is free from clearance and is comparatively stiff, while geometric errors, such as the polygon effect, and manufacturing errors and the occurrence of slip are neutralized in that the wheels are subdivided into segments, which can separately perform a tangential displacement. The belt has spaced opening for receiving the segments, which tangentially displace in case of misalignment of the segments to the belt openings. The belt has spaced opening for receiving the segments, which tangentially displace in case of misalignment of the segments to the belt openings.

Abstract: An electrically driven brake controlled skateboard employing an electric motor and associated battery mounted on the bottom of its foot supporting board employs a pulley arrangement whereby the initial slipping of its belt acts as a clutch for transferring rotational power from the motor to a U-grooved drive wheel of the skateboard. The U-groove is low cut so that the drive belt is partially exposed to the road surface. A dual purpose tether mounted brake control and on/off switch is used to control the braking of the skateboard and the energization of the drive motor.

Abstract: A transmission assembly is provided for rotating a driver pulley connected to a belt by a driven pulley such that the two pulleys define an action plane. The assembly includes a rotatable output shaft having one end adapted to be connected to the driven pulley and extending in a direction perpendicular to the action plane. The output shaft is mounted on a pivotal axis parallel to the action plane for pivotal movement in a plane perpendicular to the action plane. A rotatable input shaft is provided which is adapted to have a torque applied thereto. Finally, a mechanical coupling is provided for coupling the input shaft to the other end of the output shaft such that the two shafts angularly intersect. As a consequence of this arrangement, the torque applied to the input shaft is resolvable into a couple, one force of which passes through the pivot axis and the other of which passes through the driver pulley for applying tension to the belt.

Abstract: The invention relates to a tangential belt drive for a plurality of similar work units of a machine for the production of twisted or twined yarn. These units are subdivided into sections each having at least approximately the same number of work units and each driven through a tangential belt by an electric motor. Thereby, the number of work units in each section is established taking into account the required power and permissible belt stretch, so that the tangential belts have a considerably reduced width and thickness, compared to the ones commonly used. Further, the guide rollers of the tangential belts of neighboring sections are corotationally connected to each other.In order to improve synchronization and power transmission between sections, the contact angle is increased at the guide rollers and the drive pulleys. This may be done through the corresponding spatial arrangement of the drive pulleys with respect to the guide rollers or through use of an intermediate belt arrangement.

Abstract: A transmission unit comprises a flexible element (1) in the form of a flexible metal wire (6) on which a plurality of small equidistant coaxial cylindrical bodies (8) are fixed; the element (1) passes endlessly about two opposing drive and driven sprocket wheels (2), (3) respectively, and the two outward and return portions of said element (1) are slidingly received in two flexible sheaths (10); the two sprocket wheels (2), (3) are rotatably mounted in respective casings (4), (5) in which the opposing ends of said two flexible sheaths (10) are clamped.

Abstract: The invention relates to a tangential-belt drive for a plurality of work units of the same kind, arranged at least in one row next to each other, of a machine for the production of twisted or twined yarns. The work units are divided into sections with at least approximately the same number of work units, each driven with an endless tangential belt. At least one electromotor is assigned to each section for driving the thereto pertaining tangential belt and guiding means for the tangential belt.In order to reduce the energy losses of such a tangential-belt drive, the width and thickness of the tangential belt used is considerably reduced, particularly to a width between 7 and 14 mm and a thickness between 2 and 2.7 mm. Size reduction becomes possible because the number of working units in each section is selected by considering the working capacity required by this number of work units and the acceptable belt stretch factor.

Abstract: There is provided chain deflecting means such as rollers, sprockets or guides affixed to the cycle frame independent of the swing arm. This chain deflecting mechanism, arranged to guide and control the location of the chain with respect to the engine drive, is placed rearward of the swing arm pivot point at a location which minimizes the effect of the drive system on the swing arm motion.

Abstract: A machine tool with one or more axially movable tool-carrying spindles is provided with a drive system for transferring drive to the spindle(s) from a driving shaft parallel to the spindle(s). The driving shaft, e.g. a motor shaft, carries a plain cylindrical pulley and driven pulley(s) are provided on the driven spindle(s). A poly-vee belt is entrained around the pulleys and the or each driven pulley is formed with an outer surface shaped to enter at least one of the grooves of the poly-vee belt. In use the driven spindle(s) may be moved axially relative to the driving shaft; the belt is retained by the driven pulley(s) and rides axially along the surface of the driving pulley. The drive system allows rapid axial movement without vibration or overshoot and provides high traction. It has particular utility in high speed drilling and routing machines and the like.

Abstract: A timing chain arrangement for the overhead camshafts of an internal combustion engine wherein the driving sprocket on the crankshaft has a smaller dedendum diameter than an adjacent crankshaft bearing surface.

Abstract: A multiple rotary drive system for a textile-working machine has first and second clutch-brake units. Each clutch-brake unit has a rotatable flywheel, a non-rotatable brake surface, and a rotatable shaft to be driven, whereby the rotatable shaft can be connected to the textile-working machine as a rotary drive of the system therefor. A clutch disc and a brake disc of each clutch-brake unit are connected to the shaft thereof for rotation therewith and are arranged for controllably engaging with, respectively, the flywheel for rotatably driving the shaft therefrom and the brake surface for braking rotation of the shaft therefrom. The flywheel of the first clutch-brake unit is rotationally driven, whereby the drive system can be driven by a continuously-rotating shaft of a continuously-operating electric motor. A belt extends about each flywheel for coordinate rotation of the flywheels when the one is rotatably driven by the electric motor.

Abstract: A variable diameter pulley and belt drive has a torque and pitch radius sensitive squeeze control. The variable diameter pulleys are interconnected by a flexible belt or chain. The input pulley is connected to a power source through a pair of meshing gears and a floating link. A hydraulic control mechanism establishes the desired diameter ratio of the pulleys while the floating link is responsive to the torque transmitted to adjust the center distance between the pulleys and establish the squeeze force on the belt.

Abstract: This invention relates to a method for transmitting power to and from wheels via a train of links. The wheels have cam actuated members that effectively control the radial position of individual links as they enter, travel around, and exit the said wheels; thus, allowing for high operating speeds. The wheels also have cam manipulated members that transmit pwoer to and from the train of links such that the required engagement and disengagement of the said wheel and train of links occurs without relative slip greatly reducing wear and allowing for high operating speeds. An arrangement of links is disclosed that is especially suitable and complimentary to said wheels. Other devices are introduced that aid the said wheels and train of links as they work.

Abstract: A spinning or twisting machine has a plurality of spindles which are rotatable about upright axes aligned in a row and which are each provided with a whorl tangentially engaged by the outer face of a straight stretch of a flat drive belt. This machine is driven by a system comprising a motor having an output pulley rotatable about an upright axis adjacent the flat drive belt, a drive wheel operatively tangentially engaging one face of the flat drive belt at a drive location, and another belt reeved over the output pulley and drive wheel and driving the latter from the former. A pinch roller is operatively engageable with the other face of the flat belt at the drive location and is pressed thereagainst to pinch the flat belt between the pinch roller and the drive wheel.

Abstract: Apparatus for mechanical storage of energy derived from the rotation of a first shaft and for driving a rotatable main shaft associated with a power generator comprising, in combination, means for rotating the first shaft, connecting means for communicating the rotation of the first shaft to a first sprocketed sheave, and gear train means connecting the rotatable main shaft to a second sprocketed sheave and adapted to cause a rate of rotation of the rotatable main shaft greater than the rate of rotation of the second sprocketed sheave, the first and second sprocketed sheaves being in communication with one another by means of continuous, flexible connecting means disposed on the first and second sprocketed sheaves in non-sliding relationship therewith, the continuous, flexible connecting means having disposed thereon a weight which is raised by the rotation of the first sprocketed sheave, the second sprocketed sheave being capable of being rotated by the descent of the weight to cause rotation of the rotatabl

Abstract: An angular transmission mechanism having two axles angularly disposed for torque transmission therebetween by two bevel gears which are embraced by an elastic toothed belt having a surface area which, in the untensioned condition of said belt, has the shape of a truncated cone, the belt having teeth which correspond to the teeth of the bevel gears.

Abstract: In a drive arrangement particularly for use with the chain drive of a cycle a rotatable mass or member, (3;13;19) is arranged to receive rotational drive from the chain (4). The rotatable mass or member is preferably statically and dynamically unbalanced by weight means (19) and is so driven in relation to the positions of the pedal cranks (5,6) during the rotation thereof by a rider of the cycle that impulses of force are imparted to the chain drive in such manner that the operational forces developed in the chain drive are augmented.

Abstract: A belt-drive assembly for use on air-moving systems in corrosive atmospheres comprising a larger non-metallic driven sheave in conjunction with a smaller metallic driver sheave wherein the metallic sheave may be located in a vented enclosure is disclosed. This arrangement prevents corrosion of the drive system and prolongs belt life.

Abstract: A continuously variable transmission for a vehicle (FIG. 1) has a drive pulley (4), a driven pulley (11), and a tension pulley (19) each having a pair of axially spaced rotors. The opposed inner faces of the rotors of each pulley are formed with slopes which have gradients with respect to the respective axis of rotation increasing continuously in proportion to the radii of the faces. A plurality of belts made up of thin bands (22a, 22b, 22c) run on the three pulleys (4, 11, 19) such that the respective band edges are in contact with the respective slopes of the three pulleys. The distances between the respective slopes of the drive and driven pulleys are variable, so that the rotating speed ratio between the drive and driven pulleys can be varied by varying the contacting radii of the belts with the drive and driven pulleys, while uniform tension is imparted to the belts by the tension pulley.

Abstract: A paper folder is disclosed, in which a drive motor and a crank mechanism supplied with power from the motor are not directly coupled together. Instead, they are secured to a common plate such that their respective shafts penetrate the common plate in a suitably spaced-apart relation to one another and coupled together by a belt. An adjusting screw mechanism is assembled in the crank mechanism to permit easy and accurate adjustment of the position of the paper folding knife. The device thus can be constructed as a belt drive unit type device, which produces less noise and is subject to less wear.

Abstract: In a belt and pulley system wherein motion is transferred between the two members, the belt is a metal belt having a pulley engaging face made of a relatively soft material and the pulley is one having a regular pattern of small hard protuberances, such as formed by knurling, on its belt engaging face which press into the soft metal of the belt to form permanent depressions arranged in a matching pattern which mesh with the protuberances to provide a positive slip-free motion transfer. The belt and pulley drive may be used advantageously in a device such as an X-Y plotter for accurately positioning, with good repeatibility and fine resolution, an associated member driven in one coordinate direction by the metal belt driven in turn by the knurled pulley.

Abstract: A toothed belt drive which is particularly suitable for use in harvesting machines has belt teeth which are trapezoidal in plan and cross-section perpendicular to the direction of motion of the belt. The belt teeth are alternately oriented with the larger side edge of the base adjacent opposite side edges of the strip-like belt. The belt teeth are adapted to engage in recesses in a belt pulley which are complementarily shaped. The recesses in the belt pulley are laterally open adjacent the wider side edge to enable any foreign matter entering said recesses to be readily ejected therefrom.

Abstract: An air conditioner refrigerant compressor driving and mounting apparatus for a helicopter of the type having a free rotating power output shaft, which rotates within a power take-off pad includes a compressor drive assembly drive shaft housing supported by the power take-off pad. A compressor drive assembly drive shaft is connected with the engine power output shaft, extends linearly through the compressor drive assembly housing, and is supported therein by bearing means. A compressor drive assembly drive shaft pulley is attached to the compressor drive assembly drive shaft and rotated thereby. Bracket means are provided for mounting an air conditioner refrigerant compressor on an outer surface of the compressor drive assembly housing such that a compressor drive shaft for driving the compressor is generally parallel with the compressor drive assembly drive shaft. A compressor pulley is attached to the compressor drive shaft and generally aligned with the compressor drive assembly drive shaft pulley.

Abstract: In taking dial indicator readings as a part of the so-called "reverse indicator" shaft alignment procedure for a turbine-to-compressor drive, the high breakaway torque necessary to initiate rotation of the turbine shaft is supplied by connecting such shaft to power drive means through a power chain. In this manner the turbine shaft may be quickly rotated in small, precisely controllable increments without overshoot, thus saving valuable time otherwise wasted in performing this function manually. Tapered, hollow alignment brackets minimize "bracket sag".

Abstract: A power transmission mechanism includes a gear member and an annular and eccentric floating member having internal gear teeth meshed with external gear teeth of the gear member. A pair of guide plates provided on both outer sides of either the gear member or floating member prevent lateral disengagement of the floating member from the gear member. A pair of seal rings arranged between the inner sides of the guide plates and the outer sides of either the floating member or gear member prevent entry of dust or the like foreign material into a substantially closed space between the teeth of the gear member and the floating member, to thereby improve the durability of the mechanism.

Abstract: A chain drive system (10) wherein the chain (12) includes a plurality of interconnected links (14) is provided. The chain drive system (10) includes a drive gear (28) for driving the chain (12). A rack (20) is provided and includes a plurality of spaced apart teeth (22) for engagement with the links (14) of the chain (12). Idler gears (38, 40) are provided for causing engagement between the chain (12) and the rack (20).

Abstract: An engine camshaft is driven from the crankshaft through a timing chain such that the chain has a taut side and a slack side. A second chain is drive connected between the crankshaft and a sprocket member which is maintained on the camshaft by a one-way device. The second chain has a taut side and a slack side opposite the corresponding sides of the primary timing chain. During the engine operating cycle, a torque reversal occurs at the camshaft. The second chain prevents the torque reversal from loosening or overrunning the taut side of the primary timing chain. The one-way device permits adjustment of the primary timing chain due to wear while maintaining the taut side of the second chain.

Abstract: A surface grinding machine wherein a tool holder is mounted on an upright feed screw which is in mesh with a rotary spindle nut. The latter is held against axial movement in the column of the grinding machine and is normally driven by a torque transmitting unit having an endless toothed belt trained over a first pulley which is coaxial with the nut and a second pulley mounted on the output shaft of an electric motor. A gear train is installed in parallel with the torque transmitting unit to prevent automatic lowering of the tool holder when the belt breaks. The gear train has a first gear coaxial with the first pulley, a second gear coaxial with the second pulley and an additional gear meshing with the first and second gears. The tension of the belt is monitored by a detector which transmits a signal when the belt breaks, and such signal is used to immediately arrest the motor.

Abstract: A precision roller chain with parallel runs and with an even number of links is trained around a sprocket wheel and an idler wheel and is driven around a racetrack-shaped path. To compensate for the inherent tendency of the chain to tighten and loosen in a cyclic manner, the idler wheel is formed with a smooth periphery and has a somewhat smaller diameter than the effective diameter of the sprocket wheel. In addition, compensating ramps hold the chain outwardly away from the idler wheel adjacent the tangency points of the idler wheel and keep the chain tight when the rollers of the chain are in angular positions which otherwise would cause the chain to inherently loosen.

Abstract: My invention relates to a method of power transmission using a new type belt drive. This belt drive will supply both axial motion with a speed reduction or increase and will also change a rotative force into a reciprocating force. All of this would be accomplished by a special flexible V-belt and special pulleys.