The role of photoelectric switches in printers

The function and application scenarios of photoelectric switches in printers
As the "sensing nerve" of the printer, the photoelectric switch achieves non-contact detection through the principle of light signal obstruction or reflection, covering the entire process control from paper processing to equipment safety. It is a key component to ensure the automation operation of the printer. Its applications can be divided into three categories: medium detection, equipment status monitoring, and precision control. The specific functions and corresponding sensor types are as follows:
Media detection and processing: ensuring precise and controllable paper flow
Paper edge and position detection
Real time tracking of paper edges through reflective or reflective sensors, such as KODENSHI's Paper Edge Detection Sensor, can accurately identify paper offset and avoid paper jams or printing misalignment. The paper feed sensor (such as PSR11 series) triggers a signal when the paper enters the printing channel, initiating the subsequent printing process
Identification of Paper Boxes and Media Types
Paper box detection: Sensors (such as KIT501A) detect whether the paper box is installed in place. If it is not placed correctly, an error is triggered.
Size and Type Recognition: The Paper Cassette Size Sensor determines paper size (such as A4, A5) based on differences in reflected light intensity, while the Media Detection sensor can distinguish between media types such as regular paper and photo paper, and automatically adjust printing parameters.
Paper output and stacking control
The paper output sensor detects the passing status of the paper and controls the speed of the paper output roller to avoid paper stacking or jamming. It is commonly used in the rear section of the fixing unit of laser printers