Identifying printing substrate types
AssigneeHewlett-Packard Development Company, L.P.
InventorsFrancisco Javier Roses Conesa, Jorge Solanas Lerida
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Abstract
Devices and methods for identifying categories or types of print media in image forming apparatuses are disclosed. In an example method print media are advanced in a feeding direction to reach a cutting position, a cutter is advanced in a cutting direction, perpendicular to the feeding direction to cut the print media, friction between the cutter and the print medium is measured, and the print media are identified based on the measured friction.
Claims15
A method of identifying a category or type of a print medium in an image forming apparatus, the method comprising:
- advancing the print medium in the image forming apparatus in a feeding direction to reach a cutting position;
- advancing a cutter of the image forming apparatus in a cutting direction, perpendicular to the feeding direction to cut the print medium;
- measuring friction between the cutter and the print medium;
- and
- identifying the category or type of the print medium based on the measured friction.
A device to identifying a category of a print medium, comprising:
- a cutter, to cut the print medium along the cutting dimension;
- an actuator, to advance the cutter along the cutting dimension;
- an encoder, coupled to the actuator;
- a controller, connected to the actuator, to register the position of the cutter along the cutting dimension and to measure friction changes as a result of the cutter finding resistance from the print medium when cutting;
- and
- a processor to
- receive measured friction changes;
- identify respective cutter positions;
- identify a first average friction value when the cutter is advancing without cutting;
- identify a second average friction value when the cutter is advancing during cutting the print medium;
- calculate a change in friction value as a function of the identified first and second friction values;
- and
- identify the print medium based on the calculated change in friction value.
An image forming apparatus, comprising:
- a feeder, to advance a print medium in a feeding direction;
- a cutter, to cut the print medium in a cutting direction, perpendicular to the feeding direction;
- a motor, connected to the cutter, to advance the cutter in the cutting direction;
- an encoder, connected to the motor, to register positions of the cutter along the cutting direction in time;
- and
- a controller, coupled to the encoder, to:
- detect changes in the motor's speed as the cutter advances in the cutting direction to cut the print medium;
- and
- identify the registered position at the encoder during the motor speed changes,
- wherein the printer is to identify a category of the print medium based on the detected changes in the motor speed and associated friction value changes when a change in the motor's speed is detected.
Dependencies are inferred from the claim text.