Lineární jednotky - EN

19 When speed and reliability are the primary concerns, the best option is a timing-belt drive. It supports extremely dynamic move- ments and therefore short cycle times. In a timing-belt drive, a toothed drive belt locks mechanically around a toothed pulley that is driven by a motor. This mechan- ical interlocking eliminates slip and ensures high forces can be transmitted. The drive can also reverse its direction rapidly and accelerate large masses. The timing belt comprises steel cables in a polyurethane sheath, has a long service life and supports a smooth running action. Because the belt itself has a low mass, it takes little energy to move it on its own. Linear Units with a timing-belt drive can be built in virtually any length. As a result, they produce Linear Units that combine high drive forces with long travel distances. The drive effect is applied where the timing belt is reversed. When using this type of drive in a vertical application, steps need to be taken to ensure the carriage does not run out of control if there is a power cut. Unless a motor brake is fitted, the timing belt can be easily moved and therefore does not hold its position independently. Linear Units with a timing-belt drive LINEAR UNITS