| 摘要 |
An apparatus <?delete-start id="DEL-S-00001" date="20070424" ?>for use on<?delete-end id="DEL-S-00001" ?> <?insert-start id="INS-S-00001" date="20070424" ?>comprising a vehicle adapted to move across <?insert-end id="INS-S-00001" ?>a surface and responsive to an operator. A head assembly <?insert-start id="INS-S-00002" date="20070424" ?>connected to a support on the vehicle <?insert-end id="INS-S-00002" ?>is adapted to carry a device for engaging the surface. An actuator <?insert-start id="INS-S-00003" date="20070424" ?>on the vehicle <?insert-end id="INS-S-00003" ?>raises and lowers the <?delete-start id="DEL-S-00002" date="20070424" ?>head assembly<?delete-end id="DEL-S-00002" ?> <?insert-start id="INS-S-00004" date="20070424" ?>support <?insert-end id="INS-S-00004" ?>relative to the surface. A position control responsive to operator input indicates a <?delete-start id="DEL-S-00003" date="20070424" ?>head<?delete-end id="DEL-S-00003" ?> position <?delete-start id="DEL-S-00004" date="20070424" ?>of the device relative to the surface or range of head positions<?delete-end id="DEL-S-00004" ?> of the <?delete-start id="DEL-S-00005" date="20070424" ?>device<?delete-end id="DEL-S-00005" ?> <?insert-start id="INS-S-00005" date="20070424" ?>head assembly <?insert-end id="INS-S-00005" ?>relative to the <?delete-start id="DEL-S-00006" date="20070424" ?>surface<?delete-end id="DEL-S-00006" ?> <?insert-start id="INS-S-00006" date="20070424" ?>support<?insert-end id="INS-S-00006" ?>. <?delete-start id="DEL-S-00007" date="20070424" ?>The head position or the range of head positions indicates a distance or range of distances, respectively, between the device and the surface.<?delete-end id="DEL-S-00007" ?> A controller responsive to the position control selectively actuates the actuator or maintain the <?delete-start id="DEL-S-00008" date="20070424" ?>device<?delete-end id="DEL-S-00008" ?> <?insert-start id="INS-S-00007" date="20070424" ?>head assembly <?insert-end id="INS-S-00007" ?>in the <?delete-start id="DEL-S-00009" date="20070424" ?>head<?delete-end id="DEL-S-00009" ?> position <?delete-start id="DEL-S-00010" date="20070424" ?>or within the range of head positions as<?delete-end id="DEL-S-00010" ?> indicated by the position control. As a result, a repeatable position <?delete-start id="DEL-S-00011" date="20070424" ?>or range of positions<?delete-end id="DEL-S-00011" ?> of the <?delete-start id="DEL-S-00012" date="20070424" ?>brush<?delete-end id="DEL-S-00012" ?> head <?insert-start id="INS-S-00008" date="20070424" ?>assembly <?insert-end id="INS-S-00008" ?>is obtained, the relative engagement between the head assembly and surface is controlled and the treatment of the surface by the head assembly is controlled. Position control may be used in combination with torque control of motors driving brushes for engaging the surface. Position control may also be used in combination with a pressure control measuring the pressure <?delete-start id="DEL-S-00013" date="20070424" ?>between<?delete-end id="DEL-S-00013" ?> <?insert-start id="INS-S-00009" date="20070424" ?>of <?insert-end id="INS-S-00009" ?>the <?delete-start id="DEL-S-00014" date="20070424" ?>brush<?delete-end id="DEL-S-00014" ?> head <?delete-start id="DEL-S-00015" date="20070424" ?>and<?delete-end id="DEL-S-00015" ?> <?insert-start id="INS-S-00010" date="20070424" ?>assembly on <?insert-end id="INS-S-00010" ?>the surface.
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