| 摘要 |
A rotary drive apparatus comprises a housing including an intermediate transmission portion, an input shaft portion connected to one end of the intermediate transmission portion and extending outwardly therefrom in a first direction and an output shaft portion connected to the opposite end of the intermediate transmission portion and extending outwardly therefrom in a second opposite direction. The intermediate transmission portion is provided with an exhaust port for the exhaust of air which is directed under pressure to an air motor which is carried eccentrically in a rotatable mounting in the input shaft portion of the housing. The air motor includes a drive pulley on its drive shaft which is connected through a belt to a driven pulley carried on a output shaft which is rotatably supported in the output shaft portion of the housing and which includes an outer drive end which is connected to a drive element, for example, a grind stone. Compressed air which is circulated through the drive motor is discharged through the exhaust port of the intermediate transmission portion of the housing. The tension on the drive belt extending between the input pulley on the air motor drive shaft and the output pulley carried on the output shaft may be adjusted by rotating the mounting for the air motor so as to vary the spacing between the input and the output shafts and thereby to adjust the tension on the belt. After this tension is adjusted the mounting for the air motor is clamped into position. |
