Abstract: A control mechanism for floppy disk drive units. A single control rod having cam lobes is mounted with an operating end extending through the front bezel of the unit. The control rod has a lobe cooperating with surfaces to establish positive loaded and unloaded positions of the driving cone and spindle of the unit. The driving cone is carried from an arm having an actuating spring cooperating with a lobe of the control rod. The actuating spring has angular detent parts whereby the control rod moves with a snap action between loaded and unloaded positions of the cone. The control rod has a further cam lobe carrying a pressure pad which comes into contact with the diskette in the loaded position along with an arm dropped or loaded with the head.

Abstract: A disk drive assembly having a shallow or low profile construction. The assembly includes a drive spindle and drive cone for the diskette. The drive cone is mounted directly from a part of the frame or chassis of the assembly. The drive spindle is cylindrical having a bottom which is dished or raised upwardly providing a bottom recess. The bushing which contains the journal bearings for the spindle shaft extends into the recess so that overall dimension of the assembly is minimized.

Abstract: A driving motor of low profile construction for use in a disk drive assembly or unit having shallow or low profile construction. The chassis has an integrally molded motor housing which is circular. A stator is received in the upper part of the integral motor housing with the rotor below the stator in the integral housing and held in position by the magnetism in the rotor. The end of the rotor shaft is coupled to the drive spindle by way of coupling in the form of a belt.

Abstract: A noise suppression circuit adapted for use with bifilar windings such as normally present in magnetic pick-up heads. The signals from the windings are coupled to a pair of operational amplifiers having a common gain control resistor for filtering out common mode noise. The first stage amplifiers are coupled to a pair of second stage amplifiers biased at the voltage of the bifilar windings and have resistance-capacitance filter circuits. The second stage amplifiers are coupled to a third stage amplifier which transforms the signal to digital form, the remaining noise appearing as spikes in the signal. The output of this amplifier is coupled to a digital noise filter circuit which includes a one-shot multivibrator coupled to a flip-flop arranged to control the digital waveform so as to filter out the spikes, that is, to eliminate the noise in the signal.