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Correction of the delay of the temperature of a print head sensor

IP.com Disclosure Number: IPCOM000013247D
Original Publication Date: 2001-Jun-26
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 58K

Publishing Venue

IBM

Abstract

Disclosed is a method for the correction of the delay of the thermal sensor in a dot-impact print head by counting the number of the printed dot to prevent overshooting the maximum head temperature. Figure 1 shows the configuration of the disclosure. The thermal sensor (thermistor) in the print head detects the temperature (Ts). The dot counter counts the dot count (Dc) printed in a specified period, for example one second. The dot count converter saves the dot count into an dot count array. The dot count converter calculates the total dot count from the latest elements of the dot count array, for example seven elements. The dot count converter converts the total dot count to the temperature (Td). The number of the element to use the calculation and the parameter of the conversion from the dot count to the temperature are previously decided. The delay compensation unit calculates the current head temperature (Tc) by adding Ts and Td (Tc Ts Td). When the head heat check unit detects that Tc runs to the limit, it request to stop printing to the control unit until Tc comes below limit. Control Unit Driver Unit (Tc)

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Correction of the delay of the temperature of a print head sensor

Disclosed is a method for the correction of the delay of the thermal sensor in a dot-impact print head by counting the number of the printed dot to prevent overshooting the maximum head temperature.

Figure 1 shows the configuration of the disclosure. The thermal sensor (thermistor) in the print head detects the temperature (Ts). The dot counter counts the dot count (Dc) printed in a specified period, for example one second. The dot count converter saves the dot count into an dot count array. The dot count converter calculates the total dot count from the latest elements of the dot count array, for example seven elements. The dot count converter converts the total dot count to the temperature (Td). The number of the element to use the calculation and the parameter of the conversion from the dot count to the temperature are previously decided. The delay compensation unit calculates the current head temperature (Tc) by adding Ts and Td (Tc = Ts + Td). When the head heat check unit detects that Tc runs to the limit, it request to stop printing to the control unit until Tc comes below limit.

Control UnitDriver Unit

(Tc)

(Td)

Print Head

Thermal

Sensor

(Thermistor)

Dot Count

(Ts)

Head heat Check unit

Delay Compensation Unit

Tc = Ts + Td

Dot Count

Converter

Dot Counter

(Dc)

Figure 1: Configuration of the disclosure.

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