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A&D COMPANY, LIMITED
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Conventionally, the device for moving the mass uses a geared motor. Despite the high cost of the geared motor, it is plagued by a number of inherent problems. For example, drive failure due to galling of the gear itself, mechanical problems due to increased complexity of the force transmission mechanism to convert the rotational motion of the motor to the up-and-down motion of the mass, or other problems such as those caused by dust getting inside the high precision driving mechanism. In order to solve these problems, A&D has changed the rules of the game and adopted a direct-driving method with a balloon-like actuator, which utilizes air pressure for its power source. Using this method, the mechanism for generating the driving force has been significantly simplified to consist of three elements; namely, a low-cost air pump, an electromagnetic valve and an air container called a “bladder.” When there is an unexpected interruption to the power supply, the pump will halt and the valve will remain open, naturally releasing the air inside the bladder and automatically transferring the mass (load) from the weighing sensor back to the original position. This provides a fail-safe mechanism for the sensor. With enhanced reliability thanks to the simplified structure, it has become possible to minimize possible problems that users might have encountered otherwise.
