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Method to change printer thermal algorithm on the fly

IP.com Disclosure Number: IPCOM000187546D
Original Publication Date: 2009-Sep-10
Included in the Prior Art Database: 2009-Sep-10
Document File: 1 page(s) / 18K

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IBM point of sale printers have a thermal algorithm so that the customer receipt (CR) motor does not overheat. The current algorithm is solely based on the number of motor steps. Once a maximum number is reached, the printer slows down printing under the number dips back below a set threshold. This method does not take into account the room temperature that the printer is operating in. If the printer is in a cooler environment, the CR motor should be able to be run longer before it overheats.

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Method to change printer thermal algorithm on the fly

This invention provides a way for the algorithm to adjust based on the operating temperature of the printer. The thermal printhead contains a thermistor which is only used to monitor the printhead temperature today. That thermistor can be used to take the temperature of the air inside the printer after the printhead cools down (this should happen within seconds after printing has completed). This thermal algorithm can then use this temperature to adjust the number of CR motor steps allowed before printing slows. Most customers run their printers in a normal "room temperature" (24° C) environment, so this would give them a large advantage, since the standard algorithm is written for a printer operating at 45° C.