Oki ML421 Maintenance Manual - Page 34

Spacing Operation See

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Oki Data CONFIDENTIAL 2.2.2 Spacing Operation (See Figure 2-4.) The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom of the carriage frame. Items included in the spacing mechanism are as follows: (a) DC motor with motor gear (b) Carriage frame (stationary yoke and motor driver board included) (c) Carriage shaft (d) Space rack (e) Sensor (f) Encoder disk (1) Spacing operation The carriage frame, on which the printhead and space motor are mounted, moves along the carriage shaft in parallel with the platen. When the spacing motor rotates counterclockwise, the driving force is transmitted to the motor gear. As the motor gear rotates, the carriage moves from left to right. Mechanically, it is designed in such a way that for every revolution of the DC motor, the carriage frame moves 0.8 inch (20.32 mm). At the same time the encoder disk rotates together with the motor and passes the sensor. The position of the carriage frame can be determined by counting the interrupts detected by the sensor. In the same way, the rotation of the space motor can be recognized and controlled by measuring the cycle of interrupts detected by the sensor. Printhead Carriage shaft Carriage frame Space rack Encoder disk Encoder sensor Motor gear 42113901 Rev.2 Slider Guide rail Figure 2-4 34 /

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42113901
Rev.2
34 /
Oki
Data
CONFIDENTIAL
2.2.2
Spacing Operation (See Figure 2-4.)
The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and
a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom
of the carriage frame. Items included in the spacing mechanism are as follows:
(a)
DC motor with motor gear
(b)
Carriage frame (stationary yoke and motor driver board included)
(c)
Carriage shaft
(d)
Space rack
(e)
Sensor
(f)
Encoder disk
(1)
Spacing operation
The carriage frame, on which the printhead and space motor are mounted, moves along
the carriage shaft in parallel with the platen. When the spacing motor rotates
counterclockwise, the driving force is transmitted to the motor gear. As the motor gear
rotates, the carriage moves from left to right.
Mechanically, it is designed in such a way that for every revolution of the DC motor, the
carriage frame moves 0.8 inch (20.32 mm).
At the same time the encoder disk rotates together with the motor and passes the sensor.
The position of the carriage frame can be determined by counting the interrupts detected
by the sensor.
In the same way, the rotation of the space motor can be recognized and controlled by
measuring the cycle of interrupts detected by the sensor.
Figure 2-4
Slider
Guide rail
Printhead
Carriage shaft
Carriage frame
Space rack
Encoder disk
Encoder sensor
Motor gear