Browse Prior Art Database

Rotary Scan Mechanism

IP.com Disclosure Number: IPCOM000075777D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 3 page(s) / 58K

Publishing Venue

IBM

Related People

Arrington, WM: AUTHOR

Abstract

This device is a modular type rotary input scanning mechanism for use on recording machines using either a sheet, belt or disc for the recording media, both flat and pregrooved. The device incorporates the following features: 1) The mechanism allows the operator to accurately position the magnetic record/playback head to find the portion of the recoating and/or track position desired. This is due to the fact that the input is a relatively small knob that requires rotation to effect movement of the magnetic head, and requires only finger movement. No movement of the wrist, elbow or arm, which are suitable only for relatively coarse movement is required.

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Rotary Scan Mechanism

This device is a modular type rotary input scanning mechanism for use on recording machines using either a sheet, belt or disc for the recording media, both flat and pregrooved. The device incorporates the following features:
1) The mechanism allows the operator to accurately position the

magnetic record/playback head to find the portion of the

recoating and/or track position desired. This is due to

the fact that the

input is a relatively small knob that requires rotation

to effect movement of the magnetic head, and requires

only finger

movement. No movement of the wrist, elbow or arm, which

are suitable only for relatively coarse movement is required.
2) The mechanism is so designed that inadvertent movement and/or

striking of the exposed scanning knob does not disturb

the head position

and/or the remainder of the mechanism, thus preventing

damage to the internal machine parts such as the leadscrew and

leadscrew follower or pawl in the case of flat media and the

head, head mounting, and media in the case of a pregrooved

media. This is accomplished thru the use of an internal

toothed clutch so arranged that the rotary knob must be pushed

in to scan. At such a time that the teeth on the clutch start

to engage, the mechanism has retracted the pawl from the

leadscrew or the head from the groove in the media so that all

mechanisms involved are free to move.
3) The mechanism incorporates positive stops, so that at the

extreme ends of the desired travel the possibility of stressing

any of the mechanism involved is eliminated.
4) The mechanism is of a modular design, which can be assembled

and

adjusted independently of the rest of the machine and then

mounted in the machine. The only positive connection between

it and the remainder of the mechanism is where the drive band

is attached to the head carrier mechanism.
5) An indication of head position is immediately possible by

inspection at any time during recording, this being indicated

by a dial which moves in conjunction with the magnetic head

during record and playback. The time recorded or the time

left to

record is determined by an auxiliary scale o...