Imaging system and defect detection program based on toner image check pattern data

An imaging system comprising:

• a plurality of image carriers to carry toner images;
• a transfer belt to which the toner images are to be transferred from the plurality of image carriers, the transfer belt to convey the toner images;
• a medium conveying device to convey a medium;
• a transfer device to transfer the toner images conveyed by the transfer belt to the medium conveyed by the medium conveying device;
• a fixing device to fix the toner images transferred to the medium to the medium;
• and
• a control device, wherein
• at least one of the plurality of image carriers to carry a fixing check toner image including a check pattern to indicate whether an image defect is caused by the fixing device and a transfer check toner image including a check pattern to indicate whether the image defect is caused by the transfer device,
• each of the plurality of image carriers to carry a conveyance check toner image including a check pattern to indicate whether the image defect is caused by the toner image conveying device and a formation check toner image including a check pattern to indicate whether the image defect is caused by the toner imaging device,
• the transfer belt to convey the fixing check toner images, the transfer check toner images, and the conveyance check toner images,
• the transfer device to transfer the fixing check toner images and the transfer check toner images to the medium from the transfer belt,
• the fixing device to fix the fixing check toner images to the medium, and
• the control device to determine a stop state where the fixing check toner images are fixed to the medium, the transfer check toner images are transferred to the medium and are positioned on the upstream side of the fixing device, the conveyance check toner images are positioned on the transfer belt between the plurality of image carriers and between the image carrier, which is closest to the transfer device, and the transfer device, respectively, and the formation check toner images are positioned on the plurality of image carriers, respectively, the control device to stop operations of the plurality of image carriers, the transfer belt, and the medium conveying device in the determined stop state;
• and
• a memory in which check pattern data including the fixing check toner images, the transfer check toner images, the conveyance check toner images, and the formation check toner images is recorded, wherein
• the imaging system to form the fixing check toner image, to form the transfer check toner image, to form the conveyance check toner image, and to form the formation check toner image on the basis of the check pattern data recorded in the memory,
• the imaging system to form the fixing check toner image, to form the transfer check toner image, to form the conveyance check toner image, and to form the formation check toner image on the basis of the check pattern data recorded in the memory.

A non-transitory memory device having instructions stored thereon that, in response to execution by a processing device, cause the processing device to perform operations comprising:

• forming a toner image by a toner imaging device;
• conveying the toner image formed by the toner imaging device by a toner image conveying device;
• recording the toner image conveyed by the toner image conveying device on a medium conveyed by the medium conveying device;
• determining a stop state including at least one state of a state where a recording check toner image including a check pattern to indicate whether an image defect is caused by the toner image recording device is recorded on the medium, a state where a conveyance check toner image including a check pattern to indicate whether the image defect is caused by the toner image conveying device is positioned on the toner image conveying device, and a state where a formation check toner image including a check pattern to indicate whether the image defect is caused by the toner imaging device is positioned on the toner imaging device;
• in the determined stop state, stopping the formation of the toner image that is performed by the toner imaging device, stopping the conveyance of the toner image that is performed by the toner image conveying device, and stopping the conveyance of the medium that is performed by the medium conveying device;
• recording the check pattern data including the recording check toner image, the conveyance check toner image, and the formation check toner image in a memory;
• and
• forming the recording check toner image, the conveyance check toner image, and the formation check toner image on the basis of the check pattern data recorded in the memory.