shaft 35 and articulated in the appendix 36 and shaft 9 maintaining the gearing nevertheless the adjustment of the frame to the aperture would normally transmit a rotation to the shutter partially blocking the projection this rotation however is neutralized at its point of origin by the support of the spline the base of which is a fixed semi gear centered with a shaft and coupled to the toothed support of the chassis centered with a pivot so that when the aperture is adjusted revolving the assembly formed by the external spindle internal spindle anterior rod posterior rod pivot the gear support and the shaft it obliges the spline support with its fixed semi gear coupled to the toothed support of the chasis to increase the angle described by the spline support causing the spline to push the feed ratchet and the whole assembly formed by the spring clutch plate shaft gear primary gear secondary gear and reduction gear to which it is coupled compensating for the shutter position so as to completely unblock the projection the mechanical system feeds the film in accordance with its frequency of frame change variable with pre established programmed pulses while rewinding the already projected film as can be seen in fig6 the film spool situated in its reel rests above a disc which revolves round the shaft actuated.