Carriage Mechanism (Ha) - Centronics 101AL Technical Manual

COVER
CARRIAGE MECHANISM
5.2.1.3 Adjustments
Side covers (A-4, A-3) lock into speed clips located on inside walls
of covers. For perpendicular adjustment of covers, in relation to base, ad-
just length of ball stud (A-19) with nut (A-32) located at ends of standoffs
(A-39), if required.
9.2.2 CARRIAGE MECHANISM (Figure HA)
5.2.2.1 OQperation
The function cf the carriage mechanism is to hold the head under the
best condition to print characters against the platen and to move the head from
left to right and return it to the starting position after printing the last
character.
The carriage (HA-9) has two guide rollers (upper) (HA-10), a guide
roller unit (HA-21) and two rollers (upper and lower) (HA-26, 31) to hold
the carriage on the guide bar (HE-8) and guide plate (HE-23). The head
bracket (HA-1), mounted on the carriage, holds the head by four screws and
is movable back and forth up to 1 mm (0.039-in.). This adjustment is made
by turning an eccentric shaft on the head penetration adjusting knob (HA-32).
The adjustment is determined by the number of copies to be run. The head
lock knob (HA-33) is mounted on the left-hand side of the carriage and locks
the eccentric shaft after positioning head in relation to platen. Play be-
tween head bracket and carriage can be eliminated by gib (HA-45) which is
fixed on carriage by two screws (HA-46) and positioned by set-screws (HA-48).
When the carriage is positioned over the right or left-hand reed switch
(HE-78) a magnet, mounted on lower portion of carriage, closes the reed
switch and sends a signal to indicate the carriage position to electronic
ogic.
The carriage is moved by the main driving belt (HA-36). Parts
(HA-41) through (HA-44) and HA-58) through (HA-64) are mounted on the under-
side portion of the carriage. These parts are designed to absorb shock on
the belt and are adjustable for proper belt tension and linear alignment.
The ribbon guide roller (HA-5), mounted on the carriage and head
bracket, holds the ribbon at proper position and ensures proper tension on
the ribbon while printing. Bracket (HA-50) supports the ribbon cable, lamp
holder, and fiber optic assembly. This assembly determines print registration.
5.2.2.2 Removal/Replacement Procedure
A. Head
For removal and installation of print head, refer to Section
5.2.13.2.A. : |
9-3