Abstract: The present invention provides a method for fabricating a metal matrix composite having high specific strength and stable performance and capable of fabricating at low cost, the method comprising heating a preform of metal matrix with reinforcing fiber to the temperature, which is below the high temperature region, of low temperature region or medium temperature region of the plastic deformation temperature of the metal matrix in a pressure vessel having an initial processing pressure and keeping for a predetermined time for a preparative treatment before the step of hot-isostatic-pressing the preform by keeping at a high temperature region capable of HIP treatment and of diffusing welding temperature of the metal matrix in a pressure vessel; for instance, in case metal matrix is titan or titan alloy, the preparative treatment is conducted at a preparative treatment temperature of about 300° C. to 700° C. and at a pressure in the pressure vessel of about 30 to 100 kg/cm2.

Abstract: An optically variable magnification mechanism that comprises a motor which rotates in one direction. A rotary cam is arranged so as to be rotated in one direction by the motor and has cam surfaces assigned on a periphery thereof corresponding to a plurality of magnification steps. A cam drive unit is arranged for transmitting a rotary force from the motor to the cam. An optical system is movable between positions corresponding to the magnification steps. A transmission system is arranged for transmitting a rotary force of the cam to the optical system to change the positions of the optical system sequentially.

Abstract: An automatic control system for a hulling machine including a fixed rotary hulling roll, a movable rotary hulling roll, means for moving the movable rotary hulling roll toward and away from the fixed rotary hulling roll to adjust the gap between the two hulling rolls and a main electric motor for driving the two hulling rolls. The system includes load detecting means for detecting the load applied to the main electric motor, and control means for connecting the load detecting means to the means for controlling the movement of the auxiliary shaft whereby the gap between the two hulling rolls can be automatically adjusted in accordance with the load applied to the main electric motor.

Abstract: A roll type huller including a housing, a pair of hulling rolls parallelly spaced apart within the housing, a main shaft carrying one of the rolls and supported by the housing rotatably about a fixed axis, and a counter shaft carrying the other roll and supported near the free end of an arm mounted at the base by a pivot which is spaced from, and parallel with, the fixed axis, so that the counter shaft can move toward and away from the main shaft while maintaining the parallelism. The pivot is supported by the housing in a relative position opposite to the roll-carrying portion of the counter shaft. The location of the pivot may be inside the housing beneath the counter shaft or outside of the housing above the shaft or elsewhere provided the aforesaid relationship with the shaft is maintained.