4.5.2.4 Drum rotation drive belt These appliances are fitted with elastic drive belts. The motor is mounted in a fixed position, and no regulation is possible. 1. Motor pulley 2. Elastic drive belt 3. Drum pulley Different types of drive belts, produced by various manufacturers and with different characteristics, are used in production. The length marked on the drive belt (1217, 1280 etc.) is the working length based on the belt mounted on the pulleys, which is calculated according to the following parameters:
D = diameter of drum pulley de = diameter of motor pulley I = centre-line distance between the pulleys For a given working length, the belts - which consist of different materials - have a different degree of elasticity. This means that, when not fitted to the appliance, their lengths may be different. It is normal that the length of a belt not fitted to the pulleys of one supplier is different to the belt of another supplier. The belts are of the poly-V type, and are marked with two further parameters: shape of the drive belt (J / H) number of teeth (4, 5, 6, 7, 8) SOI/DT 2006-03 dmm 27/70 599 37 67-82