Abstract: An image formation apparatus according to one or more embodiments may include: a first conveyer; a second conveyer provided downstream of the first conveyer; a detector that detects a deflection of the medium between the first and second conveyers; a speed controller that controls a speed of the second conveyer within a first speed range; a calculator that calculates an average convey speed of the second conveyer. The calculator calculates a first average speed in a first period from when a leading end of the medium reaches the second conveyer to when the medium is conveyed a predetermined distance from the second conveyer. The speed controller changes, after the first period elapses, the speed of the second conveyer within a second speed range with the calculated first average convey speed as a criteria speed of the second conveyer, based on the detection result from the detector.

Abstract: An image formation apparatus according to one or more embodiments may include: a first conveyer; a second conveyer provided downstream of the first conveyer; a detector that detects a deflection of the medium between the first and second conveyers; a speed controller that controls a speed of the second conveyer within a first speed range; a calculator that calculates an average convey speed of the second conveyer. The calculator calculates a first average speed in a first period from when a leading end of the medium reaches the second conveyer to when the medium is conveyed a predetermined distance from the second conveyer. The speed controller changes, after the first period elapses, the speed of the second conveyer within a second speed range with the calculated first average convey speed as a criteria speed of the second conveyer, based on the detection result from the detector.

Abstract: A linear motor coil assembly includes a base plate (1), a line of iron cores affixed longitudinally on the upper surface of the base plate, multiple coils respectively provided for the iron cores, and a first cooling tube being in contact with contacts the multiple coils and through which a first refrigerant passes. The lower surface of the base plate can be attached to a precision table of a machine tool or a semiconductor manufacturing apparatus. A groove (8) that extends longitudinally in linear fashion is formed on the lower surface of the base plate. A second cooling tube (92, 94), through which a second refrigerant passes, provided within the groove is additionally provided in the linear motor coil assembly.

Abstract: A linear motor coil assembly includes a base plate (1), a line of iron cores affixed longitudinally on the upper surface of the base plate, multiple coils respectively provided for the iron cores, and a first cooling tube being in contact with contacts the multiple coils and through which a first refrigerant passes. The lower surface of the base plate can be attached to a precision table of a machine tool or a semiconductor manufacturing apparatus. A groove (8) that extends longitudinally in linear fashion is formed on the lower surface of the base plate. A second cooling tube (92, 94), through which a second refrigerant passes, provided within the groove is additionally provided in the linear motor coil assembly.

Abstract: A linear direct current motor comprises a center yoke (1) ending in the longitudinal direction X, an outer yoke (31) arranged parallel to the center yoke, a peat magnet (41) for generating magnetic field between the outer yoke and the center yoke, and a coil assembly (10) that is movable in the longitudinal direction X having an opening through which the center yoke passes. This coil assembly includes a flat cooling pipe (7) having a cross section elongated in the longitudinal direction and a U-shaped fold for passing the center yoke through, a manifold (9) having a cooling medium inlet (9A) and a cooling medium outlet (9B) and being connected to both ends of the cooling pipe, and a coil (5) wound around the cooling pipe and the manifold.

Abstract: A linear direct current motor comprises a center yoke (1) ending in the longitudinal direction X, an outer yoke (31) arranged parallel to the center yoke, a peat magnet (41) for generating magnetic field between the outer yoke and the center yoke, and a coil assembly (10) that is movable in the longitudinal direction X having an opening through which the center yoke passes. This coil assembly includes a flat cooling pipe (7) having a cross section elongated in the longitudinal direction and a U-shaped fold for passing the center yoke through, a manifold (9) having a cooling medium inlet (9A) and a cooling medium outlet (9B) and being connected to both ends of the cooling pipe, and a coil (5) wound around the cooling pipe and the manifold.

Abstract: An electric discharge machining apparatus has a pair of carbide formation detectors for minimizing carbide formation and for preventing abnormal discharges from occurring across the machining gap. If the discharge voltage is below a lower reference voltage for a predetermined period of time and for a predetermined number of ON/OFF cycles, then the first detector compares the discharge voltage with a higher voltage level. When the discharge voltage is greater than the higher level for a predetermined period of time and for a predetermined number of ON/OFF cycles, the first carbide detector generates an ARC STOP signal for halting the machining operation. A second carbide formation detector will generate an ARC STOP signal for halting the machining operation when the discharge waiting time is less than a predetermined period of time for a predetermined number of cycles.