| 摘要 |
A mechanism for transporting flat articles (130), such as envelopes, onto and across the tray (36) of a scale (12). A belt (110) is trained about a combination of rollers (74) received within slots (38) of the tray (36) which, in combination with flaps (120) supported by the tray, are used to transport a flat onto the weighing scale. When a flat is to be weighed, it is transported onto the tray (36), the rollers (74) are withdrawn below the tray by an increase in tension in the belt (110) and the flaps (120) hold the flat (130) securely against the tray. The tray (36) is then oscillated by an electromagnet (37) and the weight of the flat is determined from the harmonic period of oscillation. Upon completion of weighing, the tension in the belt (110) is reduced to permit the rollers (74) to rise back above the tray (36) to remove the flat from the tray. |
