David Saul's precision roll scanner, used for scanning rolls for later production of new recut rolls on his own personal perforator.
Leonardo Perretti's scanner
Kevin Keymer's scanner
Another view of Kevin Keymer's scanner
Peter Phillips and his scanner (1971)
Lee Roan's scanner
Ross Chapman's scanner. Paper flow from top right to bottom left.
Note hand scanner in use as a position encoder at supply end.
Richard Stibbons' Mk3 circuit board at bottom left. CIS beneath paper, light source above.
Ian McLaughlin with his scanner and Mk 3 board, with Richard Stibbons and Julian Dyer, March 2003.
Warren Trachtman's highly resourceful scanner made with simple materials and components
commonly available. Note his MK3 board mid-right,
Julie Porter's test roll scanner using a MK3 system. For further information and pics, see:
Gene Gerety's multi-format scanner capable of accepting rolls from 4" to 20" wide
with a variety of spool chuck adapters. Operates with Gene's RollSCAN-1 system. See:
Scanner built by Spencer Chase, owned by Richard Stibbons, and loaned to Julian Dyer. Note the curved
platen, a significant modification by Julian, to ensure faithful punch-for-punch roll scans. In this scanner,
the CIS sensor is mounted inside the curved surface, looking through a narrow slot at the roll passing by,
and illuminated from above by a conventional high-frequency beneath-the-counter fluorescent lamp.
Two more scanners built by Spencer Chase. The one on the left is his second one, following the one gifted
to Richard Stibbons. The one on the right is a new one capable of scanning rolls up to 16" wide,
using a pair of overlapping CIS sensors.
Albert de Boer's scanner.
Bob Pinsker's scanner, basically constructed out of a spool box from a Wurlitzer player piano.
Note his handwired breadboard version of his own unique design for a roll scanning system.
Another view of Bob Pinsker's scanner showing a roll being scanned.
Note the use of an old hand scanner being used as an encoder to report paper movement to the software.
David Stankov's roll scanner built from a conventional player piano spool box.
Dave Kerr with YARS4, known affectionately as "Big Red"
Music roll "reader" built by Richard Tonnesen in 1979. The music roll in the transcribing assembly is moved by rotating identical capstans above and below the tracker bar. The paper wraps about one-quarter turn around each rubber-coated capstan; a pressure roller is not used. 100 hoses from the brass tracker bar connect to vacuum operated pneumatic pouches which operate tiny wire switch contacts. A rotating shutter connected to the paper drive system interrupts a light beam at each 0.022 inch of paper travel. This signal causes the electronic commutator circuit to read the state of the pouch switches. The transcriber system has been in continuous use since 1979, and it requires no more maintenance than a well-maintained player piano.
Back of Richard Tonnesen's Reader. The wooden contact blocks at the top were the very first part of the whole project to be built. Vacuum is supplied to each block through a manifold at the top. Tubes from the tracker bar enter the front side of the blocks. Red wires from the contacts are routed down the back to the electronic boards. A small single board computer at the left generates scanning signals to read the state of the contacts. If a change of state is detected, the computer generates an ON or OFF event code for the appropriate channel. These events are queued in the computer until they can be sent to the reader program in the control computer, which eventually writes the output file on disk.
Close-up of reader contacts of Richard Tonnesen's roll reader. Each tube from the tracker bar is connected to a one inch diameter pouch in the lower part of the block. The pouch pushes up on a 1/8 inch wooden dowel which slides up through a brass tube in the top block. A 1/4 inch leather disk is glued to the top of the dowel on the outside. The contact assemblies are mounted on the outside of the pouch boards where the wooden dowel pushes the lower contact up against the upper one. The contacts can be cleaned and adjusted as needed. The lower contact is 3/16 inch phosphor bronze. It provides the restoring force to the pouch. The upper contact is a U shaped piece of silver wire. When the contacts are closed, the lower part and the upper part have a different radius. This provides a scraping motion at the point of contact, which helps keep them clean. The contacts are operated at 21 volts DC.
For more information and pics of Richard's companion perforator, see mmd.foxtail.com/Pictures/tonnesen.html.