Sheet feeding device, image forming apparatus, and method for controlling a sheet feeding device
AssigneeKYOCERA Document Solutions Inc.
InventorAyato Morikami
Life of this patent
Estimating the term…
Abstract
A sheet feeding device has cursors slidable to regulate a sheet, a sensor portion including a variable resistor to output a voltage commensurate with the position of the cursors, a storage portion storing width detection data in which ranges of a sensor value based on the output of the sensor portion are defined for different sheet widths respectively, and a control portion calculating the sensor value, determining a particular range as a correction target range, calculating a difference between the actual sensor value and the center value of the correction target range, and correcting a limit value of the correction target range at the border with another range.
Claims9
A sheet feeding device, comprising:
- cursors arranged on a sheet tray on which a sheet is placed, the cursors being slidable to abut opposite edges of the placed sheet to regulate position of the sheet;
- a sensor portion including a variable resistor and outputting a voltage commensurate with position of the cursors;
- a storage portion for storing width detection data in which ranges, for different standard sheet widths respectively, of a sensor value are defined, the sensor value being a value commensurate with a level of an output of the sensor portion and obtained based on the output of the sensor portion;
- and
- a control portion
- which processes an output voltage of the sensor portion to obtain the sensor value,
- which performs sheet width detection to detect placement of a sheet of a width corresponding to one of the ranges to which the sensor value belongs,
- which makes the storage portion store the sensor value obtained during the sheet width detection,
- which takes as a correction target range one of the ranges corresponding to, out of different standard sheet widths, a sheet width that has been detected a number of times equal to a natural number times a predetermined number of times,
- which calculates a difference between the sensor value as actually obtained and a center value of the correction target range, and
- which corrects an upper or lower limit value of the correction target range at a border with another range.
A sheet feeding method, comprising:
- outputting from a sensor portion a voltage commensurate with position of cursors provided on a sheet tray to be slidable to abut opposite edges of a placed sheet to regulate position of the sheet;
- storing width detection data in which are defined ranges, for different standard sheet widths respectively, of a sensor value obtained based on an output of the sensor portion;
- obtaining the sensor value by processing an output voltage of the sensor portion;
- performing sheet width detection to detect that a sheet of a width corresponding to the range to which the sensor value belongs is placed;
- storing the sensor value obtained during the sheet width detection;
- taking as a correction target range one of the ranges corresponding to a sheet width that has been detected a number of times equal to a natural number times a predetermined number of times;
- calculating a difference between the sensor value as actually obtained and a center value of the correction target range;
- and
- correcting an upper or lower limit value of the correction target range at a border with another range.
Dependencies are inferred from the claim text.