Abstract: A control device for a USB interface including at least one first terminal for inputting the data to be transmitted and at least one second terminal for the transmission of the packet data on a bus; the packet data include one end-of-packet signal. The USB interface includes one circuit for the data transmission on said at least one second terminal; the USB interface is adapted to receive as an input a signal for the activation of the transmission circuit when data are received from the at least one first terminal and the transmission circuit includes a bias circuit. The control device includes a circuit for the detection of an end-of packet signal on said bus and a control circuit adapted to activate the bias circuit of the transmission circuit if said end-of-packet signal is detected by said detection circuit.

Abstract: A clock signal constituted by pulses with given frequency of repetition and a data signal is able to assume two logic levels are transmitted simultaneously on a two-wire line in the form of a bipolar differential pulse signal with frequency of repetition of the pulses equal to the frequency of repetition of the pulses of the clock signal and in which the sign of the pulses of the pulse signal applied to said two-wire line varies according to the logic level of the data signal.

Abstract: A workpiece-gripping device for tool machines having a motorized chuck mounted on an operating head comprises a housing, a driving shaft journaled in the housing and provided with a shank engageable in the chuck, a locking member configured to engage a reaction member integral with the operating head when the shank engages the chuck, whereby the rotation of the device is prevented when the chuck is driven, and at least a pincer having jaws, of which at least one is movable and operatively connected via transmission means to said driving shaft for opening and closing.

Abstract: A control device for a USB interface including at least one first terminal for inputting the data to be transmitted and at least one second terminal for the transmission of the packet data on a bus; the packet data include one end-of-packet signal. The USB interface includes one circuit for the data transmission on said at least one second terminal; the USB interface is adapted to receive as an input a signal for the activation of the transmission circuit when data are received from the at least one first terminal and the transmission circuit includes a bias circuit. The control device includes a circuit for the detection of an end-of packet signal on said bus and a control circuit adapted to activate the bias circuit of the transmission circuit if said end-of-packet signal is detected by said detection circuit.

Abstract: A clock signal constituted by pulses with given frequency of repetition and a data signal is able to assume two logic levels are transmitted simultaneously on a two-wire line in the form of a bipolar differential pulse signal with frequency of repetition of the pulses equal to the frequency of repetition of the pulses of the clock signal and in which the sign of the pulses of the pulse signal applied to said two-wire line varies according to the logic level of the data signal.

Abstract: A workpiece-gripping device for tool machines having a motorized chuck mounted on an operating head comprises a housing, a driving shaft journaled in the housing and provided with a shank engageable in the chuck, a locking member configured to engage a reaction member integral with the operating head when the shank engages the chuck, whereby the rotation of the device is prevented when the chuck is driven, and at least a pincer having jaws, of which at least one is movable and operatively connected via transmission means to said driving shaft for opening and closing.

Abstract: A pull-up circuit for input/output terminals of electronic appliances is disclosed. The circuit is arranged between an input/output terminal and a supply voltage terminal and includes a first transistor and a resistance serially connected and coupled between the input/output terminal and the supply-voltage terminal and circuitry suitable for driving the transistor so as to switch it on or off depending on whether the values achieved by the voltage of the input/output terminal belong or do not belong to a set range of voltage values within the supply-voltage value.

Abstract: A circuit for providing a minimum wake-up time, in which a monostable circuit generates the WAKE-UP signal for a time at least as long as a minimum time established by the monostable circuit. The circuit is structured to extend the WAKE-UP signal for a time necessary to equal the minimum time that is established by the monostable circuit and to disable the WAKE-UP signal at the end of the variation of the input signal of the device being controlled.

Abstract: The present invention refers to a circuit for current injection control comprising a first transistor having an input terminal, an output terminal and a control terminal, having the characteristic of comprising a second transistor having an input terminal connected to said output terminal of said first transistor, an output terminal and a control terminal and also comprising coupling means placed between said input terminal and said control terminal of said second transistor, said coupling means being active when said first and second transistor are in cut-off zone.

Abstract: A pull-up circuit for input/output terminals of electronic appliances is disclosed. The circuit is arranged between an input/output terminal and a supply voltage terminal and includes a first transistor and a resistance serially connected and coupled between the input/output terminal and the supply-voltage terminal and circuitry suitable for driving the transistor so as to switch it on or off depending on whether the values achieved by the voltage of the input/output terminal belong or do not belong to a set range of voltage values within the supply-voltage value.

Abstract: A frame (10) carries two fixtures (16, 20), of which at least one (20) is movable, and which have respective crescents (18, 22) adapted to be brought together to form a circular profile engageable with the big end of a connecting rod and separable by opening means for fracturing the big end of the connecting rod.

Abstract: The present invention refers to a circuit for current injection control comprising a first transistor having an input terminal, an output terminal and a control terminal, having the characteristic of comprising a second transistor having an input terminal connected to said output terminal of said first transistor, an output terminal and a control terminal and also comprising coupling means placed between said input terminal and said control terminal of said second transistor, said coupling means being active when said first and second transistor are in cut-off zone.

Abstract: A machining head (36) is drivable along a vertical axis and two horizontal axes with respect to a workpiece held on a workpiece-holding device, and has, at progressively lower levels along said vertical axis, one or two high-speed spindles (44), one or two low-speed spindles (46) and one or two feed-out spindles (48), all arranged at right angles to said vertical axis and driven by one or more motors (42) mounted on the head. The machining head can bring the high-speed spindles to cooperate with a tool-changing magazine (52). The workpiece-holding device (54; 154) is adapted to carry two sets of workpieces on respective supports (56, 58; 170), and to shift said supports in succession between a working position near the head and a tool-changing position remote from the head.

Abstract: A working head for numeric-control machine tools is adapted to be moved along two or three axes relative to one or two parts mounted on respective worktables which can rotate about respective parallel axes. According to the present invention, the head supports one or preferably two tool-supporting spindles which are pivoted about a common axis which is transverse to the axes of the spindles under the actuation of motor means which are rigidly coupled to the head and are controlled by a numeric control unit.

Abstract: According to the invention, parting of the cap of the connecting rod is achieved by engaging the eye of the big end of the connecting rod with two semicylindrical fixtures, respectively a fixed fixture and a movable fixture, which are actuated by a hydraulic actuator which is interposed between them and is adapted to expand the fixtures in a diametrical direction against the inner surface of the eye of the big end of the connecting rod, subjecting the piston of the actuator to the action of a hydraulic fluid fed into the respective actuation cylinder at an optional pre-loading pressure that is in any case lower than the pressure required to reach the yield point of the material of the connecting rod, and producing an instantaneous peak in the pressure of the fluid fed to the hydraulic actuator by means of an auxiliary piston that is subjected to the momentary action of a striking mass.