Transparency having printing surface discriminating area method

Details Transparency having printing surface discriminating area method Transparency having printing surface discriminating area method

1997-05-15

2000-09-19

Tran, Huan

Incremental printing of symbolic information

Thermal marking apparatus or processes

Record receiver driving means

B41J 232, B41J 1146

Patent

active

061219894

ABSTRACT:
A transparency having a printing surface discriminating region includes an activating region for activating an optical sensor and a nonactivating region so that whether a printing paper is properly supplied can be detected by the sensor. Also, an apparatus for discriminating the printing surface of the transparency in a thermal printer includes a CPU for controlling a printing process by driving a thermal print head heat generator when the printing medium is paper and performing a printing surface discriminating process when the printing medium is a transparency, a stepping motor for transferring the printing medium in a predetermined step unit under the control of the CPU, a printing surface detecting sensor for detecting a region for discriminating the printing surface of the transparency under the control of the CPU, when the printing medium is a transparency, a comparator for receiving the output of the printing surface detecting sensor and outputting a digital signal to the CPU, and a memory for storing printing surface discriminating data which is output from the CPU. Therefore, when the transparency is improperly supplied, it is automatically discharged, so that damage to a thermal print head is prevented.

REFERENCES:
patent: 5438345 (1995-08-01), Hisaaki
patent: 5519428 (1996-05-01), Van Peteghem

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