Epson TM-T88II Series Manual de Instruções descarregar pdf (Página 49)

2-10 Mechanisms and Operation Rev. A

The shield plate provided around the sensor is grounded to the main frame. This printer is

designed so that the sensors are exposed when the frame cover is open, but the shield plate acts

as a lightning rod to protect sensors against electrostatic damage. The paper sensor board is

linked to the switch circuit board assembly-B by the paper sensor lead.

Printer Mechanism

The thermal head is designed so its heating element is positioned where it comes into contact

with the platen. The roll paper wrapped around the platen is kept in contact with the thermal

head’s heating element at a prescribed pressure, and printing is performed when heat is

generated by the heating element.

This printer employs a thick-film thermal head that consists of a head tip with a heating element,

a driver IC for driver control of the heating element, a thermistor that monitors the temperature

of the thermal head, a heat shield that protects the head tip against abnormal heat, a print circuit

board that is linked to the signal line, and head support shafts (spring pins).

The thermal head is connected to the main circuit board unit-A by an FFC connected to the

connector. Figure 2.4.12 shows a cross section of the thermal head heating unit and the (thermal)

roll paper.

Printing is performed according to the following steps:

1. The print signal sends a prescribed energizing pulse to the electrodes that correspond to

each dot to be printed.

2. Resistors at each electrode generate heat.

Figure 2.4.10 Paper end sensor mechanism

Paper guide

Photosensor

Shield plate

Main frame (bottom)

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Epson TM-T88II Series Manual de Instruções Página 49