Olivetti CMS 140 B euro, Service Manual, Page: 10 / 55

2-2 Service Manual 686770R
2.1.3 MECHANISMS
This printer consist of two print wheels, a hammer, and
a carriage equipped with an ink roll. It is a serial printer
with movable type, and it prints by sequentially moving
the carriage across from the lowest-order column.
When the motor is activated, the gear trains rotate and
cause the print wheels and detection wheel to rotate.
When the trigger coil charged by a signal (corresponding
a character) output from the sensor, a character is
selected, the print wheel stops, the print gear is rotated
by the action of the planet gear, and a character is
printed.
Fig. 2-1 Exterior View
The carriage then shifts to the next column (column-
shift operation). When charge to the trigger coil is
extended during character selection at the end of a line,
printing is performed and the carriage is returned to the
initial column. The paper is then fed forward to complete
the printing of one line.
This printer consist of five mechanism: the transmission
and select, defection, print, inking, and paper feeding.
Fig. 2-1 shows an external view of the Micro serial
Printer. For details on the operating principles and
handling of each mechanism, see Subsection
2.2
Operating Principles, and Chapter 3 Handling
and Maintenance.