installation for the manufacture of a window for the development of reading operation in a register of a printing machine or the like

摘要

Control apparatus for the registration of a printing press or the like incorporates means for generating a pulse of predetermined length, referred to as a window pulse, and a short reference pulse which is centered within the window pulse. The window pulse is generated by a flip-flop which is triggered at a predetermined time during each revolution of a printing cylinder, and an integrator, operative in response to triggering of the flip-flop, integrates an input signal proportional to the speed of the press until a predetermined level is reached, at which time the flip-flop is reset. A reference pulse is derived from a second integrator which integrates an input signal which is twice the rate of that of the first integrator so that the reference pulse always falls in the center of the window pulse.