Abstract: Provided is a work machine capable of achieving both low fuel consumption and ensuring of workability. The work machine is configured to, in a state where an output of an engine or hydraulic pump has increased to an increase threshold (S12: Yes) with the rotational speed being at a first rotational speed (S11: Yes), raise the rotational speed from the first rotational speed to a second rotational speed (S13); in a process of raising the rotational speed to the second rotational speed, output, to a regulator, a signal instructing reduction in the discharge rate (S14) so as to keep the output of the engine or hydraulic pump constant; and after the rotational speed has reached the second rotational speed, output, to the regulator, a signal instructing increase in the discharge rate (S16) so as to make the output of the engine or hydraulic pump have a value corresponding to a request load.

Abstract: A predetermined value is used for adjusting welding power to an optimum value to consistently achieve sturdy welds. The predetermined value is not affected by variations in workpiece materials and in wear of electrodes. Preferably, total power per unit volume of the workpieces is used as the predetermined value. In a resistance welding system, total power per unit volume required to satisfactorily weld the workpieces is calculated from a total thickness of the workpieces and a welding time. From this calculated total power per unit volume, power per unit volume and per unit time is calculated. The present welding system adjusts one of the welding current or the welding voltage to an optimum value required to produce the predetermined value.

Abstract: A magnetic head unit comprising a magnetic head supporting member provided with a magnetic head receiving hole formed in an extremity thereof, and a reading/writing magnetic head placed within the magnetic head receiving hole at a correct position with respect to reference surfaces formed in the underside of the magnetic head supporting member and adhesively fixed to the inner surface of the magnetic head receiving hole.

Abstract: A magnetic head assembly including a carriage which carries thereon a first magnetic head for information writing and reading to and from one side of a disc-like magnetic recording medium, and a hold case which carries thereon a second magnetic head for information writing and reading to and from the other side of the magnetic recording medium, the second magnetic head being disposed in a position opposed to the first magnetic head, the hold case being connected to the carriage through hinge means rotatably to a certain degree relative to the carriage, and the magnetic head assembly being reciprocated in a radial direction of the magnetic recording medium. The first magnetic head is mounted on the carriage through a gimbal spring which is formed rotatably to a certain degree with respect to biaxial hinge portions, and the second magnetic head is mounted on the hold case through a spring plate which is formed rotatably to a certain degree with respect to a uniaxial hinge portion.