| 摘要 |
Roller ( 1 ), particularly a castor-type roller, with rotational movement of a running wheel ( 12 ), with an operating shaft ( 20 ) which passes through a control cam ( 19 ) of the roller ( 1 ) and on which an electric motor ( 37 ) acts via a gear mechanism to operate it, wherein the electric motor ( 37 ) acts on the operating shaft ( 20 ) by means of an electric motor shaft ( 39 ) via a toothed gear mechanism ( 38 ), the toothed gear mechanism ( 38 ) having a driven gear wheel ( 41 ), a hub ( 40 ) of which is passed through by the operating shaft ( 20 ).
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