| 摘要 |
<p>The weighing apparatus includes weigh members wich are movable in sequence in a continuous path. Each weigh member receives an item to be weighed and includes a member which is movable in response to the weight of the carried item. When an item to be weighed is deposited on a weigh member, the movable member moves in response to the weight and then "springs" back in an oscillating fashion. The weigh members, each carrying an item to be weighed, are rapidly moved in sequence along the continuous path to a weighing location and the time, is sufficient to substantially cease by the time that the weight member arrives at the weighing location. At the weighing location, light radiation is impinged upon a boundary edge of the movable member and a pattern of light radiation is provided which is characterised by the position to which it moved in response to the weight of the item carried by the weigh member. Diffraction waves from the boundary edges interact to form an interference pattern wich is characteristic of the position of the movable boundary edge relative to the fixed boundary edge. The pattern is analysed to determine the weight of an item borne by each respective weigh member.</p> |
