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US 11,429,052 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomoya Inuzuka
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes an image bearing member, an image forming portion, an endless belt, a plurality of stretching rollers including an inner roller, an outer roller, a position changing mechanism capable of changing a position of the inner roller to a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt, a feeding member, a feeding member driving portion, and a controller. A feeding start timing of a recording material by the feeding member depends on the position of the inner roller during transfer of a toner image onto the recording material.
Claims24
An image forming apparatus comprising:
- an image bearing member configured to bear a toner image;
- an image forming portion configured to form the toner image on the image bearing member;
- an endless belt onto which the toner image formed on the image bearing member is transferred at a primary transfer portion;
- a plurality of stretching rollers including an inner roller, the plurality of stretching rollers being configured to stretch the endless belt;
- an outer roller configured to form a secondary transfer portion, in cooperation with the inner roller, where the toner image is transferred from the endless belt onto a recording material;
- a position changing mechanism configured to move the inner roller to change a position of the secondary transfer portion with respect to a circumferential direction of the inner roller,
- wherein the position changing mechanism is capable of changing a position of the inner roller to a plurality of positions including a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt;
- a feeding member configured to feed the recording material to the secondary transfer portion;
- a feeding member driving portion configured to drive the feeding member;
- and
- a controller configured to control a feeding start timing of the recording material by the feeding member,
- wherein the feeding start timing of the recording material by the feeding member depends on the position of the inner roller during transfer of the toner image onto the recording material.
9 more elements
An image forming apparatus comprising:
- an image bearing member configured to bear a toner image;
- an image forming portion configured to form the toner image on the image bearing member;
- an endless belt onto which the toner image formed on the image bearing member is transferred at a primary transfer portion;
- a plurality of stretching rollers including an inner roller, the plurality of stretching rollers being configured to stretch the endless belt;
- an outer roller configured to form a secondary transfer portion in cooperation with the inner roller, where the toner image is transferred from the endless belt onto a recording material;
- a position changing mechanism configured to move the inner roller to change a position of the secondary transfer portion with respect to a circumferential direction of the inner roller, the position changing mechanism being capable of changing a position of the inner roller to a plurality of positions including a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt;
- a feeding member configured to feed the recording material to the secondary transfer portion;
- a feeding member driving portion configured to drive the feeding member;
- and
- a controller configured to control a time difference from a predetermined reference timing to a feeding start timing of the recording material by the feeding member,
- wherein, in a case that the toner image is transferred onto the recording material in a state in which the inner roller is in the first position, the controller controls the time difference so that a value obtained by dividing the time difference by a driving speed of the endless belt during transfer becomes a first predetermined value, and, in a case that the toner image is transferred onto the recording material in a state in which the inner roller is in the second position, the controller controls the time difference so that the value obtained by dividing the time difference by the driving speed of the endless belt during transfer is a second predetermined value that is different than the first predetermined value.
8 more elements
Dependencies are inferred from the claim text.