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US 2013/0259498 A1Published application
Recording material end position detection apparatus and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsEijiro Ohashi, Haruki Ishibashi
Life of this patent
Estimating the term…
Abstract
An rotation angle of a crank arm is calculated on the basis of a period of time in which a recording material is detected or a period of time in which the recording material is not detected and an end position of the recording material is calculated from the calculated rotation angle, so that detection of the end position of the recording material can be started regardless of a stop position of a sensor and the end position of the recording material can be accurately detected without using a dedicated drive source or member to reciprocate the sensor.
Claims23
A recording material end position detection apparatus, comprising:
- a rotating member configured to be rotatably and pivotally supported, and rotated by a drive from a drive unit;
- a sensor unit configured to be connected to the rotating member and reciprocate by a rotation of the rotating member;
- and
- a recording material detection sensor configured to be mounted on the sensor unit and detect the presence or absence of a recording material,
- wherein the recording material detection sensor detects an end portion of the recording material in a direction perpendicular to a conveying direction of the recording material on the basis of information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is present while the sensor unit reciprocates by the rotation of the rotating member or information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is absent while the sensor unit reciprocates by the rotation of the rotating member.
2 more elements
A recording material end position detection apparatus, comprising:
- a rotating member configured to be rotatably and pivotally supported, and rotated by a drive from a drive unit;
- a sensor unit configured to be connected to the rotating member and reciprocate by a rotation of the rotating member;
- a recording material detection sensor configured to be mounted on the sensor unit and detect the presence or absence of a recording material;
- a flag configured to be used for detecting a position of the sensor unit;
- and
- a flag detection sensor configured to be mounted on the sensor unit and detect the presence or absence of the flag,
- wherein the recording material detection sensor detects an end portion of the recording material in a direction perpendicular to a conveying direction of the recording material on the basis of information related to an amount of rotation by which the rotating member rotates in a period of time in which the flag detection sensor detects that the flag is present while the sensor unit reciprocates by the rotation of the rotating member and information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is present while the sensor unit reciprocates by the rotation of the rotating member or information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is absent while the sensor unit reciprocates by the rotation of the rotating member.
4 more elements
An image forming apparatus, comprising:
- an image forming unit configured to form an image on a recording material;
- a rotating member configured to be rotatably and pivotally supported, and rotated by a drive from a drive unit;
- a sensor unit configured to be connected to the rotating member;
- and
- a recording material detection sensor configured to be mounted on the sensor unit and detect the presence or absence of the recording material,
- wherein the recording material detection sensor detects an end portion of the recording material in a direction perpendicular to a conveying direction of the recording material on the basis of information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is present while the sensor unit reciprocates by the rotation of the rotating member or information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is absent while the sensor unit reciprocates by the rotation of the rotating member, a position at which the recording material is conveyed is calculated, and an image write start position of the image forming unit is adjusted according to the calculated position of the end portion of the recording material in the direction perpendicular to the conveying direction of the recording material.
3 more elements
An image forming apparatus, comprising:
- an image forming unit configured to form an image on a recording material;
- a rotating member configured to be rotatably and pivotally supported, and rotated by a drive from a drive unit;
- a sensor unit configured to be connected to the rotating member and reciprocate by a rotation of the rotating member;
- a recording material detection sensor configured to be mounted on the sensor unit and detect the presence or absence of the recording material;
- a flag configured to be used for detecting a position of the sensor unit;
- and
- a flag detection sensor configured to be mounted on the sensor unit and detect the presence or absence of the flag,
- wherein the recording material detection sensor detects an end portion of the recording material in a direction perpendicular to a conveying direction of the recording material on the basis of information related to an amount of rotation by which the rotating member rotates in a period of time in which the flag detection sensor detects that the flag is present while the sensor unit reciprocates by the rotation of the rotating member and information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is present while the sensor unit reciprocates by the rotation of the rotating member or information related to an amount of rotation by which the rotating member rotates in a period of time in which the recording material detection sensor detects that the recording material is absent while the sensor unit reciprocates by the rotation of the rotating member, a position at which the recording material is conveyed is calculated, and an image write start position of the image forming unit is adjusted according to the calculated position of the end portion of the recording material in the direction perpendicular to the conveying direction of the recording material.
5 more elements
Dependencies are inferred from the claim text.