| 摘要 |
This invention relates to an improvement in an apparatus for automatically controlling the speed of travel of an original and of copying material in dependence upon the translucency of the original for use in a copying machine having at least one photosensitive measuring unit means in the path of travel of the original upstream of an exposure station for the measurement of the translucency of the original, a drive motor the speed of which is controllable through a signal derived from the photosensitive measuring unit means, and at least one switching element means in the path of travel of the original upstream of the exposure station, the improvement comprising time computer means, actuatable by said switching element means, which during a time computed by said computer means in dependence upon the speed of travel of the original, connects said photosensitive measuring unit means to storage means the potential of which serves for speed control of the drive motor, said switching element means being positioned immediately downstream of the photosensitive measuring unit means, and said switching element means being actuatable by the leading edge of the original. |
