Identifying print media borders
AssigneeHewlett-Packard Development Company, L.P.
InventorsFrancisco Javier Roses Conesa, Jorge Solanas Lerida
Life of this patent
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Abstract
Devices and methods for identifying border positions 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, changes in friction are identified when the cutter contacts the print media, positions of the cutter are identified when the changes in friction are identified and border positions are determined based on the identifying of cutter positions.
Claims15
A method of identifying a border position of a print medium, the method comprising:
- advancing the print medium in a feeding direction to reach a cutting position;
- advancing a cutter in a cutting direction, perpendicular to the feeding direction to cut the print medium;
- identifying a change in friction when the cutter contacts the print medium;
- identifying the position of the cutter when the change in friction is identified;
- determining the border position based on the identifying of the position of the cutter.
A device to determine a print medium's width along a cutting dimension, 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 border positions of the print medium based on the identified respective cutter positions;
- determine width of print medium based on the identified border positions.
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
- 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 border of the print medium along the cutting direction based on the detected changes in the motor speed and the registered position of the cutter when a change in the motor's speed is detected.
Dependencies are inferred from the claim text.