Patent ID: 8766113

Claim:
A sensor mechanism body, comprising: a main Roberval mechanism provided with a first fixed column fixed to or integrated with an electronic balance base, a first movable column for transmitting load of an object to be measured placed on a weighing plate, and two first beams parallel to each other for connecting the first movable column to the first fixed column so that the first movable column transmits the load of the object to be measured in a vertical direction; a sub-Roberval mechanism provided with a second fixed column fixed to or integrated with the electronic balance base, a second movable column for transmitting load of an internal weight mounted on an engaging section, and two second beams parallel to each other for connecting the second movable column to the second fixed column so that the second movable column transmits the load of the internal weight in the vertical direction; a first lever rockably supported by a first fulcrum; and a second lever rockably supported by a second fulcrum, wherein: the first movable column in the main Roberval mechanism is connected to a first end of the first lever and the second lever is connected to a second end of the first lever, the second movable column in the sub-Roberval mechanism is connected to a first end of the second lever, and an electromagnetic force generating device and the second end of the first lever are connected to a second end of the second lever, and the second fixed column in the sub-Roberval mechanism is connected to the second lever through a thin-walled connection section where cuts are created in opposite ends from both sides of the sensor mechanism body in a direction of a thickness, which is perpendicular to the vertical direction.