Image forming apparatus with mode for setting transfer voltage

An image forming apparatus comprising:

• an image bearing member;
• a transfer member configured to transfer a toner image carried on the image bearing member to a sheet by being applied with a voltage;
• a controller configured to execute a mode of outputting a test chart, which is formed by transferring a plurality of test toner images from the image bearing member, to the sheet, for adjusting a transfer voltage to be applied to the transfer member during image formation, the plurality of test toner images being formed by applying a plurality of different test voltages to the transfer member, the plurality of different test voltages including a reference voltage, a plurality of first test voltages set in conjunction with the reference voltage and having a voltage level lower than the reference voltage, and a plurality of second test voltages set in conjunction with the reference voltage and having a voltage level higher than the reference voltage;
• and
• an operation portion configured to input a type of a sheet on which the mode is executed,
• wherein after outputting the test chart in the mode, the controller is configured to adjust the transfer voltage applied to the transfer member during image formation based on the test voltage corresponding to the plurality of test toner images selected from the operation portion, and
• wherein in a case the type of the sheet inputted from the operation portion in a previous execution of the mode and the type of the sheet inputted from the operation portion in a next execution of the mode are the same, the controller is configured to set the reference voltage in the next execution of the mode based on the transfer voltage adjusted in the previous execution of the mode.

An image forming apparatus comprising:

• an image bearing member;
• a transfer member configured to transfer a toner image carried on the image bearing member to a sheet by being applied with a voltage;
• an image detecting unit configured to detect information relating to a density of test images;
• a controller configured to execute a mode of outputting a test chart, which is formed by transferring a plurality of test toner images from the image bearing member, to the sheet, for adjusting a transfer voltage to be applied to the transfer member during image formation, the plurality of test toner images being formed by applying a plurality of different voltages to the transfer member, the plurality of different test voltages including a reference voltage, a plurality of first test voltages set in conjunction with the reference voltage and having a voltage level lower than the reference voltage, and a plurality of second test voltages set in conjunction with the reference voltage and having a voltage level higher than the reference voltage;
• and
• an operation portion configured to input a type of a sheet on which the mode is executed,
• wherein the controller is configured to adjust the transfer voltage to be applied to the transfer member during image formation based on a detection result of the test images detected by the image detecting unit in the mode, and
• wherein in the case the type of the sheet inputted from the operation portion in a previous execution of the mode and the type of the sheet inputted from the operation portion in a next execution of the mode are the same, the controller is configured to set the reference voltage in the next execution of the mode based on the transfer voltage adjusted in the previous execution of the mode.

An image forming apparatus comprising:

• an image bearing member;
• a transfer member configured to transfer a toner image carried on the image bearing member to a sheet by being applied with a voltage;
• controller configured to execute a mode of outputting a test chart, which is formed by transferring a plurality of test toner images from the image bearing member, to the sheet, for adjusting a transfer voltage to be applied to the transfer member during image formation, the plurality of test toner images being formed by applying a plurality of different test voltages to the transfer member, the plurality of different test voltages including a reference voltage, a plurality of first test voltages set in conjunction with the reference voltage and having a voltage level lower than the reference voltage, and a plurality of second test voltages set in conjunction with the reference voltage and having a voltage level higher than the reference voltage;
• and
• an operation portion configured to input a type of a sheet on which the mode is executed,
• wherein the operation portion is configured to input a reference value for changing the reference voltage.