An assembly for conveying glass sheets on machines for working sheets, comprising an assembly for feeding the sheets to be worked, which engages the longitudinal edges of the sheets and is arranged upstream of a frame for supporting at least one working head, and an assembly for removing the sheets, which engages the edges of the sheets and is arranged downstream of the frame for supporting a working head.

A pneumatic device for continuously varying the pressure of compressed air for feeding pneumatic actuators, comprising a pressure regulation device, which is adapted to receive in input an unregulated pressure line and to provide in output a regulated pressure; an error amplifier, which is adapted to drive an actuation device, which in turn is adapted to actuate the pressure regulation device; and a pressure transducer, which is adapted to detect a pressure value downstream of the pressure regulation device and to feed it back to the error amplifier, for closed-loop control of the pressure regulation device.

A device for measuring the power of a motor, having a measurer for measuring the current sent to the motor and a measurer for measuring the voltage, related to the current, that is sent to the motor, a rephaser for rephasing the waveform of the voltage measured by the voltage measurer and a multiplier suitable to multiply the current measured by the current measurer with the voltage rephased by the rephaser, the output signal of the multiplier being processed in order to obtain active power.

An edge grinding unit for machines for working the edges of plates in general and of glass sheets in particular comprising at least at one rim of a plate being worked, a grinding wheel which is accommodated in a carousel element provided with a rotatable cage formed by a plurality of circumferentially distributed rollers. The edge grinding unit further comprising an arm for supporting the grinding wheel which provides, for the grinding wheel, a first oscillation axis and a second oscillation axis which are spaced one another and are substantially perpendicular to the advancement plane of the plate.

A bilateral automatic machine for machining the edges of plates of glass, stone-like and of other plate shaped materials and the like, comprising a supporting frame which has a conveyor for the plates to be machined. There are also provided an abutment shoulder and a movable shoulder for supporting abrasive grinding wheels which act on the opposite edges of the plates. The machine comprises, for each shoulder, downstream of the last grinding wheel in the direction of advancement of the plates, a sensor for detecting the dimensions of the plates being machined which drives an advancement device for the advancement of the last grinding wheel. Each grinding wheel except for the first grinding wheel along the advancement direction of the plates is provided with a detector for detecting the energy absorbed by the corresponding motor and an actuator for actuating the advancement device of the grinding wheel that is located immediately upstream as the energy absorbed by the grinding wheel located immediately downstream of it increases.