ES273136U - Perfected portacopias (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improved portacopies, of the type of those that have a board supported by an articulated support stand, in which the copy is located and held, sliding over it a horizontal parallel displacement strip, by means of cords guided between pulleys, is essentially characterized by having a sliding strip, capable of positioning on a head guided in a rail, fixed longitudinally to a coast of the lower face of the board, this head being formed by two articulated parts, rotating around a common pin, in one of which and on both sides of its periphery, have been arranged a series of even notches, coinciding in a transverse plane, in one of which are housed to be positioned, respective lugs driven by an antagonistic spring, of which the other piece is provided with it articulated, which in turn is equipped with a crossbar and parallel to the lane, to whose ends has separate protrusions "T" and whose wings are included, running through it, being the section of the latter, in the form of "C" and equipped at the junction end of this "C" of a series of grooves, in correspondence with those made on the crosspiece of the "T" shaped projection of the piece that is guided on it; existing at the ends of the axis of rotation of the two articulated parts of the head, two control buttons, one of which is fixed, while the other is capable of moving axially with the axis when performing a manual pressure between them, so that when moving the shaft, it drives a rod perpendicular to it and housed inside the piece guided in the rail; which in its normal position presses, by means of an antagonistic spring, the movement transmission belt, this being fixed between two projections made inside a cutout open in this part and through which the belt passes; producing an axial displacement of the rod in the opposite direction to the action of the spring, leaving the belt free, which allows the displacement and positioning of the head at any point of the rail; the strip is fixed at its end, provided with an orthogonal sheet, when it is introduced between two lateral projections that press it, located in the articulated part of the head, the strip being applied against the copy, or rotated a certain angle, according to in which notch is made to confront the positioning lugs, existing in both parts of the head; having a gearmotor for driving the conveyor belt of the movement of the strip, which is of the synchronous single-phase type with constant speed, located on the underside of the board, the engine being connected to a potentiometer whose preselector control, located in the inner part of the top face of the board and through a foot switch, and a timer for the stop of the gearmotor, causes a constant and predetermined rotation of the gearmotor and therefore a partial displacement of the strip, until the stop command is received, existing two other foot switches, with which the descent and continuous and automatic elevation of the same is obtained, which ceases to leave the pressure on the corresponding switch button, because it belongs to an independent circuit of the timer and potentiometer. (Machine-translation by Google Translate, not legally binding)