| 摘要 |
A belt centering device automatically operable in a belt sander (10) of the type including spaced apart rolls 24,26). The centering device is needed to keep the belt (28) from wandering off a roll. The sander (10) includes adjustable mounting means (32,34) for supporting at least one roll (26). An endless belt (28) is positioned around the rolls (24,26) and drive means are provided for the rolls (24,26) and belt (28). Alignment means including a belt edge engaging means (72) are operatively connected to the roll mounting means (32,34), and a resilient force is applied by spring (50) to hold the engaging means (72) against a belt edge (74) as the belt (28) is moved by the drive means. This causes the engaging means (72) to follow variations in the belt edge position, and this movement is transmitted to the mounting means (32,34) whereby the variations are compensated.
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