LOAD MEASURING ACTUATOR OF WEIGHING MACHINE

• Main Authors: FUJIMOTO TSUNEZO, SUZUKI MICHIHIRO, OKI EIJI
• Format: Patent
• Language: English
• Published: 05.04.1986
• Subjects: MEASURING; PHYSICS; TESTING; WEIGHING

PURPOSE:To improve weighing precision without any influence of environmental oscillation by providing a load to be measured to one terminal side of a lever and an actuator consisting of a magnet, bobbin, and coil to the other terminal side, and making the bobbin of a material containing a magnetic material. CONSTITUTION:The load 6 to be weighed and actuator 7 are provided at both sides of the fulcrum 4 of the lever 2. This actuator 7 consists of the bobbin 9, coil 10, and magnet 11 and magnetic flux is produced by flowing a current through the coil 10 to put a force F in up-down motion, performing weighing operation. Further, the input of the current to the coil 10 is adjusted by the deviation between a part 14 to be detected and a switch 15 at the left end of the lever 2, which is balanced. The part 9a of the bobbin 9 which faces the magnet 11 is made of a magnetic material. Consequently, there is residual magnetism at the facing part 9a even when no current flows through the coil 10. Therefore, magnetic attractive force operates between the facing part 9a of the bobbin and the magnet 11 to reduce the influence of the oscillation, so the weighting operation is performed stably and precisely.