MAGNETIC SPRING SUPPORT TYPE APPARATUS FOR MEASURING IMBALANCE

• Main Authors: KONO TAKASHI, MATSUSHITA OSAMI, KAWACHI MASANORI, TOMIZAWA HIDEO, TERAYAMA TAKAO
• Format: Patent
• Language: English
• Published: 18.08.1989
• Subjects: BLASTING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MEANS FOR DAMPING VIBRATION; MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES; MEASURING; MECHANICAL ENGINEERING; PHYSICS; SHOCK-ABSORBERS; SPRINGS; TESTING; TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES; TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR; THERMAL INSULATION IN GENERAL; WEAPONS

PURPOSE:To measure highly precisely the imbalance of a rotating body such as a VTR cylinder, by providing a vibrating plate on a fixed board with interposition of a magnetic spring support means made up of steel balls and magnets and by detecting vibrations of this vibrating plate by means of a non-contact- type sensor. CONSTITUTION:A vibrating stage 2 is supported movably on a foundation fixed board 8 with three or more steel balls 5 interposed, while a magnetic circuit is constituted by magnets 4 and a magnetic body (foundation fixed board 8) so that the steel balls 5 are held therebetween. By a magnetic spring effect of this magnetic circuit, a spring rigidity being uniform in all directions around some static point is given between the vibrating stage and the foundation fixed board 8. When a VTR cylinder 1 mounted on the vibrating stage 2 rotates, the vibrating stage 2 vibrates. Vibration sensor 6 and 7 are constructed by eddy-current-type or optical-type non-contact sensors, and they measure vibrations without applying useless forces to a vibration system.