The pulley deflects the shape of the belt to provide tension in the belt.

Thus, a belt conveyer which performs stable belt running without applying useless tension to the endless belt is provided.

The apparatus includes rollers (19) for tracking and/or tensioning the belt (1,2).

A rotary electrical motor (84) is moved in one direction to tighten the belt (82) on the flywheel (80) and in the opposite direction to loosen the belt (82) on the flywheel.

The rotary shaft is rotated forward when the belt is drawn out and rotated reversely by the recovering force of the spring to pull in the belt automatically thus, stretching and tensioning the belt.

In normal use the piston (36) acts on the carriage (18) to cause tensioning of the belt (8), and so enable drive.

The tensioning tools (88) are pivoted into engagement with the tensioning members (26, 28), and include a cam surface (94) which forces the tensioning members outwardly to an extended position for tensioning the belt.

A drive mechanism, such as a fluid cylinder (47), is operably connected to the slides (41, 43) to move the slides in unison to tension the belt (3).

There is no need to adjust and tension the belt, our design utilizes tracking rollers and a toothed pulley.

The pulley deflects the shape of the belt to provide tension in the belt.

A belt tensioner for tensioning a belt for a motor vehicle comprises a pivot shaft (16), a pivoting structure (14) mounted for pivotal movement on the pivot shaft (16), and a pulley (12) mounted for rotation on the pivoting structure.

Thus, a belt conveyer which performs stable belt running without applying useless tension to the endless belt is provided.

The apparatus includes rollers (19) for tracking and/or tensioning the belt (1,2).

The biasing member urges the pivot arm and pulley against a belt to be tensioned.

The invention provides for a guide system (10) for tensioning a belt.