Photoelectric device for sensing the height of a pile of paper sheets

摘要

The invention is a photoelectric sensing device, in the body of which is rotatably mounted a photoelectric sensing element, the sight opening of which is arranged in a plane with the front stops and bears on the vertical front plane of the pile of paper sheets. The body of the photoelectric sensing device can be mounted on the carrier rod of the front stops. The sensing device provides an advantage in that the device works with daylight and also with artificial light so that a special source of light is not necessary for operation of the sensing device. As a result of arranging the photoelectric sensing element in the plane of the front or lateral stops, the sight opening glass is continually wiped by falling paper sheets and is not obscured by dust. The photoelectric sensing device is simple to manufacture and is reliable.