| 摘要 |
<p>A scrub wheel 18 is provided in document processing equipment where a wheel 28 is removable and replaceable. The wheel 28 is held between a base member 26 and a top member 30 where the top member 30 comprises retaining lugs 60 at the distal ends of retention arms 58 which engage the lower surface 108 of a ledge 100 in the centre of the base member subsequent to passage therethrough when in a correct angular orientation, the lower surface 108 comprising recesses 110 which bind the top member 30 and the base member 26 under the elastic restitution force of a helical spring 56 in the top member.</p> |
