Abstract: A generator for arc welder, of the type composed of a rectifier stage followed by a PFC stage and by an inverter stage, both of the high-frequency type, the latter stage supplying power to a final rectifier stage for a welding arc, the PFC stage being composed of two inductors that are mutually magnetically coupled, two diodes with opposite conduction directions, two leveling capacitors and means for controlling the succession of the on and off switchings of the two first switches, so as to shape the current absorbed by the rectifier stage by correlating it to the waveform of the line voltage. The inverter stage comprises four triads of second controlled switches, diodes and capacitors, and there is also a control device for the four second switches and for the current for the final stage that supplies power to the welding arc.

Abstract: A generator for unitary power factor arc welders, comprising a current transformer that supplies, at a secondary winding thereof, a welding arc and is in turn supplied, at a primary winding thereof, by an input leveling and rectifying unit, between the rectifier unit and the transformer being interposed an electronic circuit with two electronic switches that provide a half-bridge structure that performs DC/DC conversion by way of the combination of the transformer and of a rectifier stage connected to the secondary winding of the transformer, and a leveling inductor, the circuit having the combination of resonant capacitive and inductive components arranged on the side of the primary winding of the transformer, the components charging the bank of capacitors arranged downstream of the electronic switches, furthermore keeping the voltage across it constant.

Abstract: A welding generator comprising an input rectifier stage, a bank of leveling capacitors, an inverter block, a transformer, a rectifier stage and an inductor downstream of which the arc forms and an input voltage adapting regulator stage having, in series at the output of the input rectifier, a first controlled electronic switch with in output a first diode also connected to the common line, an inductor, a second controlled electronic switch and a second diode being connected in series downstream of the first controlled electronic switch, the output of the inductor being connected to the common line, the second diode being connected to the bank of leveling capacitors; the voltage Vin measured at the output of the rectifier stage having thus the same orientation as the voltage V0 measured across the bank of leveling capacitors.

Abstract: A generator for arc welding machines provided with an input rectifier stage which has a unit power factor and comprises an inductor, on the mains side, two diodes and two electronic switches, one for each diode, which are driven by a driver which renders the absorption of the input rectifier stage practically sinusoidal.

Abstract: A machine for cutting panels, featuring pressure clamping devices for clamping the panels; the machine being characterized in that the carriage houses a supporting and fast-fit connecting element for supporting a cutting tool presenting a circular saw and a fast-fit connector for connection to the element.

Abstract: A welding generator comprising an input rectifier stage, a bank of leveling capacitors, an inverter block, a transformer, a rectifier stage and an inductor downstream of which the arc forms and an input voltage adapting regulator stage having , in series at the output of the input rectifier, a first controlled electronic switch with in output a first diode also connected to the common line, an inductor, a second controlled electronic switch and a second diode being connected in series downstream of the first controlled electronic switch, the output of the inductor being connected to the common line, the second diode being connected to the bank of leveling capacitors; the voltage Vin measured at the output of the rectifier stage having thus the same orientation as the voltage V0 measured across the bank of leveling capacitors.

Abstract: A machine for cutting parts, wherein a carriage, movable in a given direction, is fitted with at least one rotary tool for cutting the parts parallel to the given direction; an actuating assembly moving the carriage in the given direction to and from an idle position; the carriage supporting a drive assembly presenting a motor and a gear transmission assembly interposed between the motor and the tool; and the transmission assembly rotating the tool at a speed other than that of the motor according to at least one given reduction ratio.

Abstract: A machine for cutting panels, the substantially horizontal worktable of which supports the panels and presents a lateral guide extending in a given direction; the guide supporting a carriage presenting at least one cutting member; the carriage being movable in freely-sliding manner in the aforementioned direction to cut the panels by means of a cutting member; clamping means being provided over the worktable to clamp the panels during cutting; a store containing further cutting members being provided to the side of the worktable; and a device for picking up the cutting members being provided between the carriage and the store to replace a cutting member on the carriage with a cutting member from the store.

Abstract: A cutting machine which includes a work table made up of numerous hollow slats laid side to side and end to end, and having air holes for providing an air cushion as well as workpiece sensors in their upper surface, the sensors being associated with controls such that an air curtain is provided under the workpiece to be cut thereby keeping the workpiece from contacting the flat upper surface of the slats by air blown through the air holes located only in those slats, both longitudinally and laterally, above which the workpiece resides, and not providing air to those slats which do not sense any part of a workpiece residing above it.

Abstract: A machine including a loading station for loading a pack of panels; a cutting station in which a cutting line is defined; a fixed structure located between the loading and cutting stations presenting a work surface; and a device for 90.degree. rotation of the pack of panels loaded onto the work surface. The 90.degree. rotation device includes: a frame for supporting the pack; a mechanism for moving the frame from a level below to a level above the work surface and vice versa; and a mechanism for rotating the frame 90.degree. clockwise and vice versa. The work surface presents first and second openings with longitudinal axes respectively parallel and perpendicular to the cutting line, for enabling movement of the frame from a level below to a level above the work surface and vice versa.

Abstract: A system for notching a pack of edged panels, and including: a work surface for supporting the pack; a squaring bar for aligning the panels in the pack; a notching blade for notching the edges of the panels in the pack; a body for supporting the notching blade; and means for controlling the body. The system is mainly characterized in that, during notching, the body is moved along a horizontal path; and the notching blade presents a diameter greater than the thickness of the pack.

Abstract: A system having a stack of panels from which a pack of any given height may be removed, a work station having a supporting surface, a transfer bar for feeding the pack onto the supporting surface using at least one push member, and an arresting assembly for arresting the panels underlying the pack which tend to slip towards the supporting surface when the pack is fed by the transfer bar. The arresting assembly comprises at least one body installed between the stack and the supporting face for arresting the panels underlying the pack, an actuator for pushing the body against the bottom of the moving pack, and sensing means for detecting movement of the pack to a given point, and for activating the actuator so as to bring the body into contact with the bottom edge of the pack.

Abstract: A machine that includes: A transportation system is disclosed for transporting panels such as wood panels between two cutting stations which cut the panels along different axes. The transportation system includes, between the cutting stations, a work surface of parallel bars. The work surface further includes three portions disposed at different levels while maintaining the bars in a parallel and aligned fashion such that a slide, also including parallel bars, may pass horizontally between the three portions. The slide operates vertically as well as horizontally to pick up the panels for transport among the three work surface portions, whose different heights permit a number of different stages of operation for the slide.

Abstract: A cutting station comprising a bed; a work surface supported on the bed; a carriage traveling along the longitudinal axis of the bed by virtue of a first motor; two cutting members connected to two second motors; and a structure supporting the cutting members and second motors, and designed to travel, by virtue of actuators, along vertical slideways supported on the carriage, and to be carried by the carriage during traversing of the same. The bed comprises two fixed parallel beams supporting the work surface, and a first of which also supports two horizontal slideways for supporting and guiding the carriage. The center of gravity of the second motors lies within the space defined between the horizontal slideways.

Abstract: The invention relates to a cutter disc arbor for divider machines having a first rotating body and a first flange on which a cutter is centered. A second rotating body has a second flange facing the first flange. The second flange is movable axially between a first position in which the second flange clamps the blade against the first flange, and a second unclamped position.