Automatic printing register for telephone call recording

The ticket printer is an electro-mechanical apparatus operated by impulses delivered by the automatic central office equipment; its functions are to record all indications delivered to it in sequence by the automatic equipment and to send alarm and suitable status signals to the latter. The ticket is made from a continuous strip of thick paper wound on a roll. The numbers are printed, the elapsed time-units are recorded by punched holes, the tape is then severed and the ticket ejected. The printing of the subscribers' numbers and the charge per time-unit is made digit by digit. The date, the time of day and the serial number are printed in three operations, one for each. The duration of the connection is recorded by punched holes which are made one by one at the beginning of every minute, except that the first 3-min. unit is recorded by three holes shortly after the called subscriber answers. The mechanism of the printer is described by means of a line diagram.