Fusing And Paper Exit - Star Micronics LS-5 SERIES Technical Manual

3-3. Fusing and Paper Exit

[1] Fuser Assembly:
Comprising a heater rod, heat roll, pressure roll, temp. sensor assembly, thermostat and fuse, it fuses, on a sheet of
paper, toner transferred on it by heat and pressure.
The items related to the fuser assembly are referred to as fuser.
• Heater Rod:
A lamp with a heated coil sealed in it, located inside of the heat roll, serving as a heat source of the heat roll.
• Heat Roll:
Provides heat for fusing toner on sheets of paper.
• Pressure Roll:
Provides pressure for applying toner on sheets of paper.
• Temp. Sensor Assembly (Temp.: Temperature):
Detects surface temperature of the heat roll with which the thermistor (electric resistor to react with temperature
change) is in contact.
Based on surface temperature of the heat roll thus detected, it controls ON/OFF operations of the heater rod and
prevents excessive rise in primary temperature.
• Thermostat:
In series with the power supply of the heater rod, it prevents excessive rise in secondary temperature through
opening of the contact resulted when secondary temperature reaches the constant ambient temperature if the
preventive function by the thermistor against excessive rise in temperature (primary) fails.
• Fuse:
This is inserted next to the power supply of the heater rod. If a problem occurs such as overheating caused by the
thermistor(primary)and then by the thermostat(secondary), the fuse melts when the ambient temperature reaches
a certain level, to prevent tertiary overheating.
[2] Exit Sensor:
Detects the state of printing paper transportation in the exit area.
The state of printing paper being detected shall be ON.
Figure 2-7 Fusing and Paper Exit
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THEORY OF OPERATION