Abstract: The device for conveying a card used for a card reader of this invention includes a part for inserting the card into the reader, a path for guiding the inserted card in a predetermined direction, means for transferring the card along with the guiding path, the transferring means being provided on the guiding path, means for driving the transferring means and means for cleaning the card, the cleaning means being provided between said inserting part and the card transfer means near to the inserting part.

Abstract: A selective switching circuit which is operative to successively switch a plurality of other circuits, one at a time in a predetermined order, into an existing circuit configuration. An embodiment of the invention is described in relation to a magnetic strip card writing device, whereby information to be written on each of a plurality of strips is successively stored in corresponding registers, and later applied to the strips all at one time. Information in any of the registers may be preserved therein, with new information to be recorded being directed into the next ordered register.

Abstract: An information writing device is used to write information on a card such as magnetic card. Information to be written on a card is manually fed into the device through a keyboard. The card may be reciprocated through a driving unit to write information thereon during its forward stroke and to read out the information during its backward stroke. The information read out is collated with the input one to visually indicate resulting coincidence or non-coincidence thereof.

Abstract: A card reader protecting device is provided which prevents any wrong card or foreign substance from being pushed thereinto by providing a material to be detected such as metal foil for indicating the authenticity of any normal card, and detecting adaptive signals produced by such a material, said device comprising a detection circuit for detecting said material, and a control circuit for controlling feed of said normal card to the card reader.