HP INCFollow

Abstract

The following document describes a system to detect printer’s cutter-carriage engagement / disengagement using Hall effect sensor output voltage to determine at any time the engagement/disengagement status. This system’s intention is to prevent failures in customer side due to firmware not knowing if the cutter engagement / disengagement status is the correct one. In some cases, for example, the cutter is not disengaged when it should, and when the firmware triggers a carriage movement towards the service station, the cutter gets broken when it hits the service station. On some other cases, the cutter is not engaged when it should and therefore, the printer is not able to cut properly the media when the firmware triggers this action. To do so, the system consists of a magnet assembled into the cutter module of the printer and a Hall effect sensor assembled into the cutter engaging area in the printer’s carriage (perpendicular to the magnet). When the cutter is disengaged, the distance between the magnet and the sensor will be large. Hence, the magnetic field applied to the Hall sensor will be low. On the contrary, when the cutter is engaged, the distance between the magnet and the sensor will be short, hence, the magnetic field applied to the Hall sensor will be high. The Hall sensor produces an output voltage which is proportional to the magnetic field applied to the sensor. This voltage is sensed by a PCA. Firmware of the printer can read this voltage and know at any time the status of the cutter (engaged / disengaged).

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Creative Commons License
This work is licensed under a Creative Commons Attribution-Share Alike 4.0 License.

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