Abstract: A capless filler includes a housing, a flap, and a biasing spring. The housing has a fuel hole. The flap includes a supported part, a base, and a protrusion. The supported part is provided at an end part and is supported by the housing. The base extends to the supported part. The protrusion protrudes from the base. The flap is turned on a fulcrum at the supported part between open and closed positions. The biasing spring biases the flap in a direction from the open position to the closed position. The biasing spring pushes the base against an opening rim of the fuel hole at the closed position. The flap is turned in a direction from the closed position to the open position in response to the protrusion being pushed. At least a part of the protrusion is provided as a nozzle guide.

Abstract: A host sends each page of image data to a page printer in band units and the page printer writes the received each band data into a reception buffer in DRAM by DMA and transfers the band data from the reception buffer to an image formation section made up of members. The host gets an available buffer capacity from the printer just before transmitting each band data, and transmits the band data only when the printer can receive the band data. In the printer, a CPU permits transfer DMA to be started after reception data as much as the data amount calculated based on the data reception speed and the transfer rate is stored in the buffer to prevent an underrun error from occurring. If an underrun error occurs, the CPU sets an error flag, and sends the error flag to the host just before the host starts transmitting each band data. When receiving the error flag, the host drops image resolution and resends the page data with the resolution dropped.