| 摘要 |
PURPOSE:To prevent a sheet material from being soiled by a method wherein a stamping operation is prohibited when the sheet material shorter than a preset length is carried in an appratus for stamping a seal on the sheet material. CONSTITUTION:Carriage rollers 2, 3 are turned by a driving source, so that a sheet material is carried by means of a carriage belt supported by the rollers 2, 3. A detector 1 for detecting the sheet material comprises, for instance, a lilght detecting element and a light emitting element, making it known that one end of the sheet material has reached the detector. A seal impression 5 is provided on the surface of a stamping drum 6 to which the impression is applied when one end of the sheet material has reached the stamping position. As the sheet material and, by comparing its length with a reference value, it also prohibits the stamping operation when the length is shorter than the reference value. Thus it becomes possible to prevent the undersurface of the next sheet being soiled. |
