An apparatus to perform an operation on a conveyed object, the apparatus comprising: a head to perform the operation on the conveyed object; a plurality of sensors to detect surface data of the conveyed object; a moving device to move the plurality of sensors in an orthogonal direction orthogonal to a conveyance direction in which the conveyed object is conveyed; a first support (CR1K; CR1C; CR1M; CR1Y) disposed upstream, in the conveyance direction, from an operation position at which the head performs the operation on the conveyed object, the first support (CR1K; CR1C; CR1M; CR1Y) to support the conveyed object; and a second support (CR2K; CR2C; CR2M; CR2Y) disposed downstream from the operation position in the conveyance direction, the second support (CR2K; CR2C; CR2M; CR2Y) to support the conveyed object, wherein at least one of the plurality of sensors is disposed between the first support (CR1K; CR1C; CR1M; CR1Y) and the second support (CR2K; CR2C; CR2M; CR2Y) in the conveyance direction, and wherein the plurality of sensors is mounted on a sensor holder as a single unit to be moved by the moving device, wherein the sensor holder is configured to execute a rotational motion, wherein an area detected by one sensor of the plurality of sensors falls within an area detectable by the other sensors of the plurality of sensors located downstream from the one sensor of the plurality of sensors, or to execute a parallel motion to move the plurality of sensors to avoid a detectable portion on the surface of the conveyed object, which could degrade the accuracy in detection by the plurality of sensors; the apparatus further comprising: a light source to irradiate the conveyed object with light, wherein the surface data is image data representing a pattern generated by interference of the light reflected on a rugged shape of the conveyed object; and a calculator configured to generate a calculation result including at least one of a position of the conveyed object, an amount of movement of the conveyed object, or a speed of movement of the conveyed object, based on the surface data. a head to perform the operation on the conveyed object; a plurality of sensors to detect surface data of the conveyed object; a moving device to move the plurality of sensors in an orthogonal direction orthogonal to a conveyance direction in which the conveyed object is conveyed; a first support (CR1K; CR1C; CR1M; CR1Y) disposed upstream, in the conveyance direction, from an operation position at which the head performs the operation on the conveyed object, the first support (CR1K; CR1C; CR1M; CR1Y) to support the conveyed object; and a second support (CR2K; CR2C; CR2M; CR2Y) disposed downstream from the operation position in the conveyance direction, the second support (CR2K; CR2C; CR2M; CR2Y) to support the conveyed object, wherein at least one of the plurality of sensors is disposed between the first support (CR1K; CR1C; CR1M; CR1Y) and the second support (CR2K; CR2C; CR2M; CR2Y) in the conveyance direction, and wherein the plurality of sensors is mounted on a sensor holder as a single unit to be moved by the moving device, wherein the sensor holder is configured to execute a rotational motion, wherein an area detected by one sensor of the plurality of sensors falls within an area detectable by the other sensors of the plurality of sensors located downstream from the one sensor of the plurality of sensors, or to execute a parallel motion to move the plurality of sensors to avoid a detectable portion on the surface of the conveyed object, which could degrade the accuracy in detection by the plurality of sensors; the apparatus further comprising: a light source to irradiate the conveyed object with light, wherein the surface data is image data representing a pattern generated by interference of the light reflected on a rugged shape of the conveyed object; and a calculator configured to generate a calculation result including at least one of a position of the conveyed object, an amount of movement of the conveyed object, or a speed of movement of the conveyed object, based on the surface data. a light source to irradiate the conveyed object with light, wherein the surface data is image data representing a pattern generated by interference of the light reflected on a rugged shape of the conveyed object; and a calculator configured to generate a calculation result including at least one of a position of the conveyed object, an amount of movement of the conveyed object, or a speed of movement of the conveyed object, based on the surface data.