Abstract: A small, highly reliable and inexpensive switching equipment, in which digital signals to be switched, stored as the presence or absence of magnetic domains in a first magnetic sheet or applied as the presence or absence of light to a flat plane formed by bundles of optical fibers, are switched by switching condition determining signals stored as the presence or absence of magnetic domains in a second magnetic sheet.

Abstract: An impact receiving structure for an impact type printing mechanism, in which vibration members for guiding along branched paths the vibration of an impact receiving face member, which is vibrated by the striking energy of a printing hammer, are provided at other positions than the printing face of a platen or at the inside of a type drum in the impact type printing mechanism, and in which elastic vibration absorbing materials are packed in close contact with the vibration members, so that noise attendant with the printing hammer impact can be effectively attenuated.

Abstract: A flying printing system using a type belt, in which in order to determine a type pitch M different from a predetermined print pitch N determined by the pitch of type hammers, the respective numbers d.sub.1 and d.sub.2 (d.sub.1 >d.sub.2) of print pitches N and type pitches M per a unit length L selected to be an integral of the print pitch N are selected so that M=N.multidot.d.sub.1 /d.sub.2. Types are arranged on the type belt in the order such that respective telegraph codes of the successively arranged types successively increase or decrease in binary numbers. Type-corresponding codes are shifted in a shift register in response to shift pulses synchronized with shifting of each type of the type belt. The type-corresponding codes in the shift register and input codes to be printed are compared with each other at time intervals d.sub.1 /d.sub.2 times the pulse intervals of the shift pulses to obtain a coincidence output to thereby drive the corresponding type hammers.

Abstract: A magnetic recording system using a magnetic tape, in which information codes are recorded on a wider magnetic tape, block by block, in its transverse width dimension by reciprocating a magnetic head along the magnetic tape widthwise thereof so as to correspond with the shift direction of a secondary memory of the information codes. Indication bits are added to each block of the information codes to indicate the sweep direction of the magnetic tape by said magnetic head. Input codes are applied to the secondary memory through a primary memory. Each block of readout information codes is temporarily stored in the primary memory in accordance with states of the indication bits added to the block of readout information codes in the right or left direction so as to meet with the readout sweep direction of the magnetic head. The readout information codes are obtained from the secondary memory. A line printer may be provided to couple with the secondary memory.