Copyright © 2016
by Full-Measure Response, Inc.
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rvoit@keyforceone.com
Enabling your customers to experience the ultimate in keyboard continuity
Profile_KeyForceOne_Down Force_Up Force_Down Weight
Click for Motion Profile
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Force vs Time
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Force vs Travel
Synchronizing Forces and Finger Travel
     Sure, it's great to be able to finally see actual, continuous reaction forces
as the key is moved in various ways by the KF1 finger.  This Measure While
MovingTM capability doesn't, however, reach its potential until all measured
forces are known versus the same time variable used by the Motion Profile.
So, relative to "time zero" on the Motion Profile, each force data point must
have a timestamp associated with it.  The process of making this association
is referred to as Force Transposition.  The exact manner it is done depends on
how the forces are acquired.    Interested readers can look at Voit's U.S.
patent no. 8,865,989 for much more detailed information on this.  The two
types of force acquisition are referred to there as displacement-based and
"scanning" acquisition.
     Once Force Transposition has occurred for any routine, one can plot forces
versus actual "finger" location, rather than versus a less meaningful time
parameter.  The three graphs just below show the force results for a typical
downstroke-dwell-upstroke routine.  The first figure shows the Motion
Profile followed by the finger.  The second has the forces plotted versus time,
while the last figure plots the forces versus finger travel/displacement.  As is
typical for this type of DownForce/UpForce routine, finger travel corresponds
to key travel.  In other words, the "zero point" for this routine corresponded to
the finger just barely touching the at-rest key.  This is also typical for all types
of KeyForce 1 force measurement routines.  Initial routines utilize the
innovative kinetic key leveling functionality, which locates both the bottom
and the at-rest position of a key action.  All subsequent routines - like the
DownForce/UpForce (Up Weight) routine shown here - are then able to
conveniently use that "at rest" position as their own zero point.
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