| 摘要 |
The conveyor disclosed has power-driven rollers (11) of a type consisting in a tube (10) journalled at either end to insertable bosses (6) carrying rolling bearings (13) and provided at one end (101) with a sprocket (1) paired in constant mesh with a drive chain (18). According to the invention, the design and operation of such a roller are rendered simpler and more efficient by the incorporation of a helical catch spring (3) that ensheaths the hub (15) of the sprocket and the adjacent lip (61) of the relative journal boss (66), the boss and the end (101) of the tube being clutch-coupled via their breasted radial surfaces (8); roller drive is disconnected by an electromagnetically or mechanically operated detent mechanism (9) that engages a tooth (7) offered by a collar (4) fitted over the spring (3). In a preferred embodiment, rollers used to form a bend in the conveyor (14) may be fitted with clutch-coupled sleeves (16) so that the same nominal length of cylindrical a tube (10) can be employed as in the standard rollers used for straight stretches of the system. |
