Those collectors with book music in absolute tatters will welcome this new development. Kevin Keymer has designed
and built from scratch a lo-cost twin array scanner for variable width book music. This is a one-of construction
for a neighbor with a large collection of fairground organs, no more will he build. It and its companion software
are still a work in progress, so watch this page as I announce changes and improvements. With these pics and his eventual software,
no reason why others cannot follow in his footsteps. Very encouraging to see how he incorporates the KISS principle.
Kevin has designed this book music scanner using many of the design concepts he developed for his earlier twin-array scanner for wide rolls.
Note the hinged wood bar which contains a pair of slim ccfl lamps aligned with a matched pair of A4 CIS sensors below.
The book music passes between the lamps and the CIS.
This is a close-up of the capstan drive, the two A4 CIS sensors,
and an alignment latch to lock the lamp bar into correct alignment every time.
This is an overview of the capstan drive and the two A4 CIS sensors.
Note that the capstan is riding in a pair of ball bearings within their mounting brackets.
In the background can be seen a glimpse of the end-of-book sensor.
This is a close-up of the end-of-book sensor, which shuts down both the scanner and the software.
The scanner is equipped to handle book music from 5" to 13" wide. The crank knob is hooked to a R/L screw,
along with a second R/L screw connected to the first one by means of a cog belt to keep the tracks parallel while adjusting for width.
Again, an overview, but with the light bar in place, showing the weighted pressure roller at rest.
The system board is a MK4 fabricated from a blank MK3a board, with the two channels being used for bass and treble CIS sensors.
The green circuit board on the left is an MD-1 stepper controller.
Here is a screen display of a fragment of a 58 key Gavioli CIS file, as seen through Anthony Robinson's CIS Viewer.
Note that in book music, adjoining notes do not have a paper bridge separating the notes,
posing special programming challenge which Kevin resolved.
And here what the finished midi emulation looks like in Cakewalk. To listen to this tune, do a left click on Book_06.MID.
To download the same tune, do a right click and, "Save Target As". The tune is "Down Yonder",
and is intended for use on a 58 key Gavioli Fairground Organ.
Image of a fragment of a 36 key Pluer.
Image of a fragment of a 78 keyless Richter
In actual practice, old book music needs to be baby-sat throughout each and every scan. And that is only after serious repairs needed for most. Many old books of organ music have been repeatedly repaired over the years, such they often do not fold properly, sometimes failing to flatten out before passing under the CIS sensors, due in large part to repeated layers of tape stiffening up the hinging action. Age also takes it toll on individual leaves, warping them, curling them, inflicting all kinds of unsavoury aggravating indignations. Repair methods need to be developed and documented for the guidance of others following in this ground breaking endeavor.
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