Abstract: A mounting structure for a printed circuit board comprises a rack frame having guide rails to receive the circuit board. The circuit board is retained in fixed position in the rack frame by a leaf spring which is flexibly mounted on the circuit board and has a detent portion engageable in a recess in the rack frame. A rod member mounted on the circuit by means of a bracket is engageable with the leaf spring and is operable to flex the leaf spring between a position in which the detent portion is engaged in the recess of the rack frame to secure the circuit board in position in the rack frame and a position in which the detent portion of the leaf spring is disengaged from the recess so as to release the circuit board for removal from the rack frame. In one form the rod member is rotatable and has a flat portion which is engageable by the leaf spring to disengage the detent portion from the recess.

Abstract: A printing or stamping device for marking checks and similar documents comprises a rotatable type ring having a plurality of types around its periphery and a keyboard having a plurality of manual key-switches each corresponding to one type on the type ring. An angular position detector detects the angular position of the type ring and includes a coded disc which rotates in synchronism with the type ring and develops successive position signals indicative of the successive angular positions of the type ring. Control circuitry including a memory stores data typed-in on the keyboard and transmits successive typed-in signals to a coincidence detector which detects the coincidence of a typed-in signal and the corresponding position signal and provides a coincident signal. The coincident signal activates a stopper mechanism to stop the rotation of the type ring at a position where the typed-in type faces the check.