When a cassette is inserted, the Model CD1200A senses which cassette size has
been inserted (Small, Medium or Large) and moves the reel motors into the proper
position. The cassette is then automatically lowered onto the tape deck and the
tape is extracted from the cassette's shell by flangeless roller guides. The
CD1200A will then run a complete cleaning/inspecting cycle, which is from BOT to
EOT and then back. Optical inspection takes place in the 'reverse' mode. When
the cycle is completed the tape is retracted into the cassette shell and
automatically ejected. The units are also capable of fully manual operation.
In one cycle the tape is automatically extracted from the cassette, wrapped
around four automatically advancing tissue stations, scrapped by a sapphire
cleaning blade, optically inspected and then ejected. The automatically
advancing cleaning tissues are made of non-shedding nylon material that are
placed such that both the oxide and back sides of the tape are cleaned, both
upstream and downstream of the sapphire cleaning blade. The cleaning blade,
which burnishes the tape, is a precise bi-directional double-edged sapphire
blade designed to remove debris adhered to the tape. The CD1200A also has
operator selectable cleaning cycles, allowing the CD1200A to be run unattended.
These selections are: "one pass with tissue and blade", "two
passes with tissue only", "four passes with tissue and blade",
and "four passes with blade and two with tissue only".
The CD1200A incorporates the most advanced tape path in the digital cassette
industry. It is comprised of a completely "flangeless guiding" tape
path and a breakthrough "active guide" design that provides totally
safe and gentle handling of high-density digital tape. This breakthrough design
will not damage the tape in any manner, further it will handle previously
damaged tape as well.
Active guiding has been the subject of many discussions and experiments
throughout the tape industry. It has long been recognized that flanged guides if
not properly aligned will cause significant edge damage. Further, poor tape
stack quality has been traditionally solved by the use of a pack wheel or pack
roller that removes air between layers of tape to provide a precision stack, but
use of a pack wheel is not possible with digital cassettes. BOW Industries’
"active guiding" system provides a uniform tape stack by simply
sensing where the tape is coming out of the cassette shell and making minor
corrections to guide the tape through the tape path and onto the other reel.
FRONT PANEL AND ACCESS PANEL
The front control panel provides the operator with clear at a glance
information. Displayed are; tape in motion, blade remaining, blade in/out,
replace tissue, clean cycles, cassette size and tape footage. A System Monitor
is provided and is always operational. If a failure should occur, a number is
displayed to tell the technician which board or assembly has failed and should
be repaired or replaced.
The tissue spools and sapphire cleaning blade are easily accessible through a
top access door, which is located directly over the cleaning station.
In 1978, BOW Industries pioneered the idea of optically scanning the tape for
physical damage. Over the years this technology has been improved to its current
level, which is now available in the Model CD1200A. The optical inspector is a
reflective device that looks for physical damage such as folds, creases,
scratches, and oxide 'nicks' along the helical or transverse scan line. By
placing the sensors along the helical or transverse scan line, we can simulate
the potential loss of data under recording conditions. User adjustable
sensitivity controls allow you to change the length of the 'lost' scan line and
the number of scan lines from 1 to 64. Defects are registered as Center Defect
and Upper/Lower Edge Defects. After the tape has been cleaned and inspected, an
UP/DOWN scan feature, which works in conjunction with a footage counter, locates
the footage at which the defects occurred. This information can be displayed or
printed out for review.
A Stop on Defect (SD) option, which works in conjunction with the optical
inspector, can also be added that will allow the operator to stop the tape at a
defect location and view the physical defect in the cassette window.
With a fast operating speed of 200 ips (inches per second), gentle tape
handling, precise cleaning and optical inspection, the Model CD1200A is the
choice for maintaining your D1 and D2 digital cassette tape library.