Abstract: A computer is provided with a base unit having a receptacle, under a keyboard, capable of housing a tracking device (mouse) in the inoperative position. The tracking device is supported by a flexible sheet suitably guided by the base unit so that it may be easily withdrawn from its receptacle. The flexible sheet has a precurved part so that it causes the tracking device to snap into a raised position adjacent to the keyboard when it is in its operating position. In a variant, a supporting structure for a mouse is also provided and enables the mouse to be positioned on the left side of the computer.

Abstract: The carriage is displaced by a tooth belt which is moved continuously by an electric motor and is connected to the carriage be means of an element engaged between two teeth of the belt and slidable on the carriage in a direction perpendicular to the direction of displacement of the carriage. The pulleys are provided with a recess capable of engaging the element in such a way as to move it positively in said perpendicular direction. The carriage is also connected by means of a tension spring to a strip provided with areas of an optical encoder in respect of the print positions. The upper paper pressure arrangement is formed by two rollers carried by two sliders fitted into corresponding longitudinal slots in the fixed support. The paper is carried by a feed reel which is carried by two arms which can be fitted by catch engagement on corresponding shoulders on the fixed support. The printer is particularly suitable for being connected to the output of a personal or home computer.

Abstract: A paper and a continuous-form feed system for a desk-top printing electronic calculating machine comprises a platen, pin elements spaced from the platen and rotatable for driving perforated forms, and a guide support for supporting and conveying the forms towards the pin elements. A pair of guide elements disposed at the sides of the guide support guide the continuous forms laterally. A pair of locating elements, associated with the guide elements, position the forms transversly with respect to the guide support and the pin elements. A container, fixed removably to the calculating machine during the use of the forms, comprises a distributor from which the forms are conveyed toward the machine and a collector in which the forms coming from the machine are accommodated.