Abstract: An object hardness measuring device includes a first side portion, a second side portion, a pedestal unit, a load unit, a measuring unit, and a holding unit. The load unit applies a load to the measurement object. The measuring unit is able to measure, in a state where the load acts on the measurement object, at least one of a movement distance of the second side portion with respect to the first side portion and a change amount of the load when the second side portion is moved either at a predetermined speed or to a predetermined position. The holding unit is able to hold the measurement object, and is movable between the first side portion and the second side portion by the slide rail unit.

Abstract: An object hardness measuring device includes a first side portion, a second side portion, a pedestal unit, a load unit, a measuring unit, and a holding unit. The load unit applies a load to the measurement object. The measuring unit is able to measure, in a state where the load acts on the measurement object, at least one of a movement distance of the second side portion with respect to the first side portion and a change amount of the load when the second side portion is moved either at a predetermined speed or to a predetermined position. The holding unit is able to hold the measurement object, and is movable between the first side portion and the second side portion by the slide rail unit.

Abstract: A data recording disk file, wherein head positioning servo information is located in sectors angularly spaced around the disk, utilizes an improved head positioning control system for data track following. The control system includes timing circuitry and head position detection circuitry for generating, respectively, a servo sector initiation signal and a signal representative of the head position relative to the centerline of the desired data track to be followed. The control system also includes a velocity detector for determining the velocity of the head relative to the data tracks, a microprocessor for computing an actuator input current signal for moving the actuator and the attached head so as to maintain the head on the desired data track between servo, and memory storage means for storing predetermined constants and values of previously measured head velocity and previously computed actuator input current signals.