Abstract: A method for adjusting the tension of a drive belt wherein a tensioning device is pretensioned, e.g., after manufacturing at the plant, with a force corresponding to the force desired for subsequent operation. At this position, calibration markings are formed which can be checked during subsequent adjustments. After being mounted, the drive belt is tensioned until the markings line up.

Abstract: In a monitoring arrangement for a belt drive in which a torque produced by a drive motor is transmitted by way of an endless drive belt to a rotary member to be rotated, the drive belt is provided in its longitudinal direction with markings which are adapted to be sensed and which are disposed at equal spacings from each other. First and second sensing members are arranged at a given spacing from each other in succession in the direction of travel of the belt and are operable to sense the markings on the drive belt as they move past the sensing members. The sensing members output corresponding sensing signals in response to the markings. A signal evaluation member is connected to the first and second sensing members, for interrelating the sensing signals in respect of time in dependence on the spacing between the first and second sensing members and the speed of movement of the drive belt.

Abstract: A belt driven system (1) employs a dynamoelectric machine (11) to rotate a pulley (7) on which is positioned a drive belt (13). An improvement is a belt locator (19) for locating the belt on the pulley. The locator is effective to properly locate the belt on the pulley if it is initially mis-installed with respect to the pulley, and maintains the belt position if the belt begins to slip off the pulley during operation of the system.

Abstract: A conveyor is shown having an endless material transporting member running between an idler sprocket at one end and a drive sprocket at the other, both supported in a frame of the conveyor. A drive motor is used to drive the drive sprocket, and hence the conveyor. A controlling device for the motor is provided having a pivotally mounted slack sensing lever having a first rest position spaced apart beneath an upper flight of the endless material transporting member. A counterweight, resting on a stop urges the lever in position. The lever is fixed to a pivot pin, which has a trip lever attached. Upon slack in the chain deflecting the slack sensing lever, the pivot pin rotates moving the trip lever which in turn activates a microswitch controlling the motor. Upon sufficient deflection, the motor will be de-activated.

Abstract: A belt steering control system for a belt press having a frame and a plurality of rolls around which a pair of belts passes, said system comprising a paddle-type belt edge position sensor lightly biased against the edge of the belt for sensing the actual position of the belt edge and producing an error signal indicative of the deviation of the belt edge relative to its position where the belt is centered; the paddle sensor being connected by a control shaft to a rotary drive transfer means; the drive transfer means transmitting movement of the paddle sensor to a rotary hydraulic valve by means of a variably tensioned, spring-loaded disc which engages the rotary drive transfer means; a belt steering roll around which the belt is trained and having two ends mounted in bearings on the frame, one of the ends being mounted for translation relative to the frame; and a steering roll actuator which is controlled by the rotary hydraulic valve and skews the steering roll when necessary to maintain proper belt tracking.

Abstract: Apparatus and a method is disclosed herein whereby flexible drive members such as for example conventional V-belts may be automatically prestretched and tensioned to a particular predetermined value with both a high degree of reliability and repeatablity. The apparatus comprises a sensor for continuously monitoring the actual tension on the flexible member and providing a signal to a central control unit. A force generating apparatus is also interconnected with the central control unit and operates to exert a force such as to increase or decrease the tension to which the flexible member is subjected. Wrench means may also be provided which are connected to the central control unit and actuated thereby so as to lock the movable pulley member or the like in position once the predetermined tension has been achieved on the flexible interconnecting member.

Abstract: A printing belt extends around a rotatable cylinder having independently rotatable belt drive sprockets at the opposite ends thereof. A torque-assist drive connected with the cylinder is selectively operable for imparting supplemental traction to the belt for preventing relative slippage between the belt and drive sprockets.

Abstract: A system for correcting deflection of a belt from its normal path of movement, the belt being trained over a plurality of rollers for movement in a predetermined direction, including optical sensors for sensing a deflection of the belt in one direction, and a center axis displacing mechanism including a cam for obtaining a displacement of at least one of the rollers.

Abstract: An apparatus in which the lateral movement of a belt arranged to move along a pre-determined path is controlled. The apparatus includes a belt sensor mounted translatably on a belt support. As the belt moves laterally, the sensor translates therewith causing the belt support to pivot so as to return the belt to the pre-determined path.

Abstract: A sprocket drum assembly is constituted by two complementary, radially-separable sprocket drum assembly parts. The assembly comprises a hollow, cylindrical drum and a sprocket wheel having an odd number of sprocket teeth. The two assembly parts meet along two surfaces. The inner edges of at least those portions of said surfaces associated with the drum lie in a diametrical plane of the assembly. Each of the outer edges of those portions of said surfaces associated with the sprocket wheel lie between a respective pair of sprocket teeth.