| 摘要 |
PURPOSE:To indicate accurate measured values quickly by providing a fin to a rotary indicating plate of a weight measuring device having an accurate Roberval's parallel motion mechanism of parallelograms using the same members in opposite parts between a load receiving pan and a housing. CONSTITUTION:A stationary part 6 and a movable part 5 of the same shape are secured to the bottom surface of a housing 1 and the lower side of a load receiving tray 2, and oscillating parts 7, 8 of the same shape are connected freely turnably between both, whereby parallelograms 5 7(8) 6 7a(8a) of the same shape are formed on both side surfaces. A spring 10 is provided between stationary and movable holding arms 9, 11. In accordance with the weight of an object placed on the pan 2, the movable part 5 lowers and balances with the spring 10, then the tooth 15 of a magnifying around lever 12 turns a disc 17 by way of a rack 16 and a pinion 18. The marks 19 around the disc are detected by a photosensor 19, are digitized and are displayed in a display part 3. A fin 28 provided to the disc 17 damps the rotation of the disc to stop it quickly. Thereby, the errors owing to the position of the load receiving pan are prevented and the accurate value is displayed quickly. |
