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6. Mechanical Function
Carriage Shaft
6.1 Carriage Drive System
Idle Pulley
Carriage
This operation uses a pulse motor to move the
carriage 1/120 inch per single drive pulse. The
carriage slides on the carriage guide plate and
carriage shaft when spacing to the right and left. The
| printhead is fixed on the carriage by 2 screws.
Timing Belt
6.1.1 Power Transmission Mechanism
The rotation of the carriage motor is transmitted to
the carriage through the carriage drive pulley. The
timing belt fixed under the carriage is looped around
the idle pulley and carriage drive gear. This causes
the carriage to move left and right along the carriage
shaft. Also, the timing belt is given proper tension by
Carriage Drive Gear
the idle pulley tension spring hooked between pulley
Motor
bracket and chassis.
6.1.2 Print Timing
Print timing for pica (1/60 inch) and elite (1/72 inch) is
generated by a software operated timer. Refer to
"Carriage Motor Drive Block" page 8-10.
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6.1.3 Home Position Detector Mechanism
The home switch is a leaf switch located at the far left
of the printer. Its function is to notify the CPU of the
reference position of the carriage. During spacing
operation, when the carriage approaches the left
margin, the barrier tab, mounted under the carriage,
_ actuates the home switch, generating the signal and
indicating carriage position to the CPU.
Leaf Switch
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