HP 13255 Technical Information page 36

13255
Cartridge Taoe MOdule
13255-91032/34
Rev
AUG-OI-76
3.3
FUNC1IONAL DESCRIPTION -
CTU
TRANSPORT ASSEMBLY. Refer to tne exploded
view of the CTU Transport Assembly (figure
10),
mounting orovisions
(figure
11),
cartridge outline (figure
12),
and the parts lists
(02640-
60050, 02640-60054, 02b40-60055, 02610-60056, 02b40-60057, 02640-60067,
02640-60074, 02640-60076, 02640-00085,
and
02640-60102)
located in the
appendix.
The CTU Transport Assembly consists of a single major assembly which
fastens to the terminal mainframe with two captive screws. tach drive
has a signal cable and a motor cable connecting the drive to the Readl
Write PCA. In addition, a special bezel covers
th~
tront of tne termi-
nal mainframe with openings for each drive. The spring loaded doors
on the openings tor the cartridges provide finish fOr the unit and
protection for the drives.
Three major sub-assemblies make
UP
the transport assembly--the base
assembly, the head-bridge assembly an1 the motorltachometer assembly.
Each of these
sub-assembli~s
is oesigned to be seperately replaceable
without either special tools or adjustments. figure
10
shows an ex-
ploded view of the CTU Transport.
3.3.1 BASE ASSEMBLY - CTU
TRANSPORT ASSEMBLY.
3.3.1.1
The base assembly provides the support structure for the drive.
3.3.1.2
lhe base assembly is mounted to the terminal using two
5/16
inch well
nuts and two number
6-32
screws. The wall thickness at the mounting
surface should be )/: 12 gauge for metal or other material. The well
nuts with associated screws provide convenient captive fasteners.
More importantly, they attenuate mechanical vibrations in the 1 kHz
region and above. Without this attenuation, sharp impacts to the ter-
minal could cause read or write errOrs. A third mounting SUrface,
faced with a rubber pad, is used for location and stabilization of the
drive.
In the normal mounting attitude the cartridge is held at 15 degrees to
the horizontal. Other mounting positions may be possible but care
should be taKen to avoid having the head surface facinQ upwards to
collect dirt. Also the eject spring may have to be changed for other
mounting attitudes. Provision has been made in the tooling die for the
base for an alternate 0 degrees mounting attitude; however, this has
not yet been implemented In an optional prOduct. Mounting dimensions
and an outline of the mechanism are shown In figure 11. An outline of
th~
cartridge is shown in figure 12.
TO prevent loss of intimate tape-head contact due to insufficient wrap
and to minimize head and tape wear due to excessive wrap, the base