Abstract: Traction sheave elevator comprising a drive machine (10), a traction sheave (7) connected to the drive machine, two diverting pulleys (5,6), an elevator car (1), a counterweight (2) and a hoisting rope rigging (3) on which rigging the elevator car and its counterweight are suspended. Each deflection of a hoisting rope in the rigging (3) takes place along a circular path determined by a rope groove on the traction sheave (7) or a diverting pulley (5 and 6), occurs in essentially the same direction with respect to the direction of the shafts of the traction sheave and diverting pulleys.

Abstract: In a method for checking and monitoring the friction between the traction sheave and the suspension ropes of an elevator, the slippage between the traction sheave and the suspension ropes of the elevator is measured, the elevator comprising an elevator machine, a hoistway and an elevator car and a counterweight moving in the hoistway. The rope slippage is measured either periodically by performing test drives or continuously by means of an impulse device placed in the elevator machine and measuring the motion of the tractin sheave, an impulse device monitoring the movement of the elevator car and an impulse device monitoring the load in the car. The data provided by these impulse devices is transmitted to a computer which calculates and monitors the relative slippage between the traction sheave and the suspension ropes of the elevator.