Incremental printing of symbolic information – Thermal marking apparatus or processes – Record receiver driving means
Patent
1996-11-19
1999-08-10
Le, N.
Incremental printing of symbolic information
Thermal marking apparatus or processes
Record receiver driving means
400708, G03G 2100
Patent
active
059366559
ABSTRACT:
Method and apparatus for preventing paper jams in thermal printers are disclosed. A thermal printer of the present invention includes a motor for advancing the free end of a roll of paper between a thermal print head and a roller in a conventional manner. A controller provides control signals to the motor for controlling the amount and direction of movement of the motor. A sensor is positioned just beyond the thermal print head for detecting the presence of paper thereunder and for providing a paper detect signal indicative of same to the controller via an appropriate interface. Upon the elapse of a predetermined time period, the controller reads the paper detect signal generated by the sensor and, if the signal indicates that paper is detected by the sensor, the controller causes the motor to retract the paper. Conversely, if the paper detect signal indicates that paper is not detected under the sensor, the controller causes the motor to advance the paper so that it is detected by the sensor. If a paper jam occurs, a message is sent to an operating system to notify an attendant to take remedial action.
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Dresser Industries
Le N.
Vo Anh T. N.
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