GB1129711A - Improvements in and relating to electro-mechanical printers - Google Patents

Abstract

1,129,711. Selective printers. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 15 Oct., 1965 [16 Oct., 1964], No. 43800/65. Heading B6F. [Also in Division. G4] In a continuously rotating type-cylinder machine a hammer is provided for each character position and they are mounted on a carrier so that only one hammer at a time is in effective position. As shown in Fig. 3 the hammers h 1 are mounted! on a continuously rotating disc H and at the end of arms which are angularly spaced. andi are of progressively increasing lengths so that the hammers form a helical array and each one extends to its own column of character on a type drum T. In this embodiment the disc is geared so that its axis is at right angles to that of the type drum T and it rotates once for each angular characterpitch on. the cylinder; i.e. as many revolutions as there are characters (or blanks) spaced manually on the drum T. This applies to a. system of printing where all. characters of a like nature in the line are printed at a first step, the type drum is advanced to the next character when all positions in the line requiring this character are printed, and so on until the line is complete. The gearing could be arranged so that a complete revolution of the drum is made for each letterspace position with the appropriate timing of the operation of the hammer in that position. In an embodiment described in Fig. 2 (not shown) the hammers h 1 , h 2 &c. are arranged on small springs f at the periphery of the drum in a helical array. An operating electromagnet is located inside the drum. The printing can be effected by the two methods described in respect to the embodiment employing hammers on a disc. The paper web P, Fig. 1, is advanced by an electromagnet Mv driving rollers R 1 , R 2 . The operation of the electrical circuits is described in Divisions G4-G6.