Abstract: A laser machining apparatus comprising jet liquid, a laser beam, and a laminar flow forming channel for supplying jet liquid to a nozzle. The channel includes a distribution channel formed by a cavity, an interconnecting channel disposed to communicate with said channel downstream in an axial direction of the nozzle and formed by an annular cavity around the axis of the nozzle to provide a narrower flow passage, and a liquid reservoir chamber. Said chamber has an outer peripheral edge communicating with the interconnecting channel over an entire circumference of the annular shape. An outer peripheral surface and an outer peripheral surface of the chamber form a continuous surface and an inner peripheral wall surface and an inner peripheral surface of the channel are both formed as an inclined inward surface that is downstream, the inner peripheral surface and the inner peripheral wall surface forming a planar continuous surface.

Abstract: A laser machining apparatus comprising jet liquid, a laser beam, and a laminar flow forming channel for supplying jet liquid to a nozzle. The channel includes a distribution channel formed by a cavity, an interconnecting channel disposed to communicate with said channel downstream in an axial direction of the nozzle and formed by an annular cavity around the axis of the nozzle to provide a narrower flow passage, and a liquid reservoir chamber. Said chamber has an outer peripheral edge communicating with the interconnecting channel over an entire circumference of the annular shape. An outer peripheral surface and an outer peripheral surface of the chamber form a continuous surface and an inner peripheral wall surface and an inner peripheral surface of the channel are both formed as an inclined inward surface that is downstream, the inner peripheral surface and the inner peripheral wall surface forming a planar continuous surface.

Abstract: A laser machining apparatus comprises a nozzle for ejecting a jet liquid to a workpiece and a liquid supply unit for supplying the jet liquid to the nozzle, while a laser beam is introduced into a jet liquid column ejected from the nozzle. The laser machining apparatus further comprises a laminar flow forming channel for supplying the jet liquid to the nozzle in a laminar state.

Abstract: A laser machining apparatus comprises a nozzle for ejecting a jet liquid to a workpiece and a liquid supply unit for supplying the jet liquid to the nozzle, while a laser beam is introduced into a jet liquid column ejected from the nozzle. The laser machining apparatus further comprises a laminar flow forming channel for supplying the jet liquid to the nozzle in a laminar state.

Abstract: A liquid pressuring device comprises a reciprocating pump (1), pressure sensor (23) and pressure control unit (25) which is adapted to control the motion of the plungers (5A, 5B) so as to make an actual delivery pressure value reach a predetermined threshold and, after reaching the threshold, control the actual delivery pressure value so as to determine an optimum feed rate, and thereafter maintain the feed rate of the plungers constant at the optimum feed rate. The pressure control means (25) may include a proportional control element for performing, after the actual delivery pressure value has reached the threshold, the proportional control of the actual delivery pressure value during a time until the plungers (5A, 5B) first reach the forward stroke end thereof.

Abstract: A liquid pressuring device comprises a reciprocating pump (1), pressure sensor (23) and pressure control unit (25) which is adapted to control the motion of the plungers (5A, 5B) so as to make an actual delivery pressure value reach a predetermined threshold and, after reaching the threshold, control the actual delivery pressure value so as to determine an optimum feed rate, and thereafter maintain the feed rate of the plungers constant at the optimum feed rate. The pressure control means (25) may include a proportional control element for performing, after the actual delivery pressure value has reached the threshold, the proportional control of the actual delivery pressure value during a time until the plungers (5A, 5B) first reach the forward stroke end thereof.

Abstract: A high pressure hydraulic pump apparatus constituting a two-stage pressurizing hydraulic booster combining a pair of plunger pumps. The first and second pumps are driven into a push-pull synchronous operation at the equal stroke with each other. The per-stroke displacement of the first pump is greater than that of the second pump. The first pump draws by self-suction the liquid from a reservoir while the second pump is on the pressurizing and delivery stroke. When the first pump is on the delivery stroke, the liquid pressurized to a certain intermediate pressure by the first pump is sucked into the second pump. During the next reverse stroke the second pump further pressurizes and discharges the liquid while the first pump effects the suction stroke.