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[3] Mechanical descriptions
(1) General
Since the mechanical unit of this model shares the use with that of
the PA-3140II, procedures are identical to disassembly, re-assembly,
and adjustments. (Only the hammer unit specially prepared for this
model.)
This mechanism is made more simple by eliminating the adjustment
locations as compared with the conventional model and designed
with high reliability with more rigidity incorporated.
1. Paper feed mechanism
The paper feed mechanism employs the pulse motor drive system
which works to rotate the platen via the pinion gear ® and idler gear
@ when the paper drive signal is given from the main PWB.
As it uses a pulse motor, it can feed the paper with ease in both
forward and backward directions. Paper is fed by 1/96" per pulse, and
the detent works 1/24".
Mechanical fine adjustment is not provided. Fine adjustment is per-
formed by means of software.
The pulse motor @ and the idler gear @, both mounted on the
flexible PF holder ©, are pulled by the spring © toward the platen
gear © with a fixed force. This keeps zero clearance between the
idler gear @ and the platen gear ©, and no adjustment is necessary.
IFig. 3-1]
PA-W1400
2. Paper release mechanism
—
{Fig. 3-2]
3. Carriage structure and driving method
(Structure)
The carriage unit consists of the following drive blocks.
@® Printwheel drive motor (WH motor)
@ Ribbon lift/feed drive motor (RB motor)
@® Print hammer solenoid (HM solenoid)
(Drive system)
The carriage is driven by the carriage motor (CR motor), located on
the right side frame of the printer, via the carriage timing belt.
(Home position)
[Fig. 3-3]
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