Patent GB-1037153-A (GB)
Title: Improvements in or relating to apparatus for setting a type roller or similar type carrier
IPC: G06F3/09
Filed: 1965-02-19
Abstract: 1,037,153. Selective printing. SIEMENS & HALSKE A.G. Feb. 19, 1965 [Feb. 20, 1964; Jan. 15, 1965], No. 7162/65. Heading B6F. [Also in Division G4] A printer used for the read-out from electronic computers or teleprinters comprises a type cylinder 21 (shown as eight octagonal members rigidly coupled together) which is selectively rotated and axially moved by stepping motors H.V. These motors each have a plurality of windings on its stator, each of which windings is associated with one or more respective poles and have a single pole or multi-pole rotor which is stepped angularly when any one of the stator windings is energized thereby drawing the rotor into the nearest transverse magnetic field of that one winding. The rotary movement to the cylinder 21 is imparted via a keyway in the spindle 22 and gearing 23 from the stepping motor H. Axial sliding movement is derived from a heartshaped cam 28 which is formed so that for each #th of a revolution the cylinder 21 moves two places. This ensures an even backward and forward movement. In an alternative construction (Fig. 9, not shown) the cylinder 21 is held in a bracket formed with a toothed rack which is engaged by a gear on the shaft 26. Electrical operation.-Upon each spindle 22, 26 is mounted a contact disc divided into eight sectors to correspond with the character positions. The discs also have three annular rings so that the three areas in each sector represent a binary code, e.g. zone al disc 21 represents code 001, a2=010, a3=011 &c. These codes are compared with incoming signals and the rotative and axial position of the cylinder 21 is set accordingly. In one manner of doing this (Fig. 4, not shown) the two stepping motors H, V are started and continued to step by way of mechanical relay contacts operated in cooperation with the annular contact rings. When the binary code represented by the zone on the disc corresponds with relays operated by an incoming signal motor relays HH, HV are operated and the motors stop. In an alternative method the motors are controlled by electrical gates (Fig. 6, not shown). The incoming signal comprises six elements S1, S2, S4, S11, S12, S14 whilst the locally generated signals from the contact discs 24, 27 appear on lines C1, C2, C4, C11, C12, C14. These two sets of signals are compared in OR-gates G1 &c. and when coincidence is detected there is no output to step the motors WIH, WIIV. To ensure step-by-step movement the line C1, which is live for each second step of the motor, applies its voltage to two control gates GIH, GIIH which receive a voltage also from the output of the gates G1 &c. This enables the winding WIH of the stepping motor to be energized to draw its rotor into the next position. In this position the code disc 24 cuts off voltage from c1 and motor stops. For further stepping the second winding WIIH is energized if required. In a further arrangement, Fig. 7 (not shown), the motors are capable of selective operation in either direction and a coincidence comparison device considers the actual position of the type carrier and the position it has next to be, so the shortest route thereto is taken. Case-shift.-One of the signal lines is devoted to case-shift or letters to figure and vice versa. The type-cylinder has its figures and letters arranged on separate parts so that selection movements are as small as possible.