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US 11,231,672 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasato Suzuki
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a flag, a sensor, a loop controller, a detector, and an image controller. The flag is disposed between the first and second conveying units and moves when in contact with a recording material having a loop. A signal value output from the sensor varies per a flag position. The loop controller changes a recording material speed based on the signal value output. The detector detects the recording material or an image formed on the recording material and the image controller changes an image forming condition based on the detection. The detector includes first and second contacting members that move to nip the recording material. A position of the flag, for changing a signal value output from the sensor, is included in a range in which first and second contacting members are movable.
Claims15
An image forming apparatus comprising:
- a first conveying unit configured to convey a recording material;
- a second conveying unit configured to convey the recording material;
- a flag disposed between the first and second conveying units and configured to be moved in a case where the flag is in contact with a recording material having a loop formed between the first and second conveying units;
- a sensor configured to output a signal of an output value that varies depending on a position of the flag;
- a loop controller configured to change a speed of conveyance of the recording material conveyed by at least one of the first and second conveying units in accordance with the signal output from the sensor;
- a detector disposed between the first and second conveying units and configured to detect the recording material or an image formed on the recording material;
- and
- an image controller configured to change, in accordance with a result of the detection performed by the detector, an image forming condition to form the image on the recording material,
- wherein the detector includes a first contacting member configured to contact with a surface of the recording material and a second contacting member configured to contact with the other surface of the recording material and which faces the first contacting member to nip the recording material, and further includes a first urging member configured to urge the first contacting member to the second contacting member and includes a second urging member configured to urge the second contacting member to the first contacting member,
- wherein the first and second contacting members are movable in a direction in which the first and second contacting members nip the recording material, and a position of the flag, for changing the output value of the signal output from the sensor, is included in a range in which the first and second contacting members are movable when viewed in a direction which is orthogonal to the direction in which the first and second contacting members are movable and which is orthogonal to a conveying direction of the recording material,
- wherein the first contacting member and the second contacting member nip the recording material both in a case where the signal output from the sensor has a first output value and in a case where the signal output from the sensor has a second output value, and
- wherein (i) a position of the flag in which a value of the signal output from the sensor is changed coincides with (ii) a position in which (a) urging forces of the first and second urging members are balanced and (b) the first and second contacting members are stopped when viewed in the direction which is orthogonal to the direction in which the first and second contacting members are movable and which is orthogonal to the conveying direction of the recording material.
9 more elements
An image forming apparatus comprising:
- a first conveying unit configured to convey a recording material;
- a second conveying unit configured to convey the recording material;
- a flag disposed between the first and second conveying units and configured to be moved in a case where the flag is in contact with a recording material having a loop formed between the first and second conveying units;
- a sensor configured to output a signal of an output value that varies depending on a position of the flag;
- a loop controller configured to change a speed of conveyance of the recording material conveyed by at least one of the first and second conveying units in accordance with the signal output from the sensor;
- a detector disposed between the first and second conveying units and configured to detect the recording material or an image formed on the recording material;
- and
- an image controller configured to change, in accordance with a result of the detection performed by the detector, an image forming condition to form the image on the recording material,
- wherein the detector includes a first contacting member configured to contact with a surface of the recording material and a second contacting member configured to contact with the other surface of the recording material and which faces the first contacting member to nip the recording material, and further includes a first urging member configured to urge the first contacting member to the second contacting member and includes a second urging member configured to urge the second contacting member to the first contacting member,
- wherein the first and second contacting members are movable in a direction in which the first and second contacting members nip the recording material, and a position of the flag, for changing the output value of the signal output from the sensor, is included in a range in which the first and second contacting members are movable when viewed in a direction which is orthogonal to the direction in which the first and second contacting members are movable and which is orthogonal to a conveying direction of the recording material,
- wherein the first contacting member and the second contacting member nip the recording material both in a case where the signal output from the sensor has a first output value and in a case where the signal output from the sensor has a second output value,
- wherein a light emission unit and an ultrasonic wave reception unit are disposed on the first contacting member and an ultrasonic wave transmission unit is disposed on the second contacting member, and
- wherein, when viewed in the direction which is orthogonal to the direction in which the first and second contacting members are movable and which is orthogonal to the conveying direction of the recording material and in a condition that the recording material exists in the first conveying unit and the second conveying unit, (i) the flag, the sensor, and the first contacting member are disposed to be on a first side of the recording material and (ii) the second contacting member is disposed to be on a second side of the recording material that is a side that is different from the first side.
10 more elements
Dependencies are inferred from the claim text.