| 摘要 |
A multiple copy electrostatic hold-down apparatus includes a unidirectional high voltage generator having one side, usually at ground potential, connected to a pinning applicator while an automatic switching device periodically and alternately applies first one side and then the other side of the generator's D.C. output to the back surface of the copyboard. As the applicator is drawn over the outer face of sheets abutted against the copyboard front surface, areas of positive and negative charge are deposited in random distribution on each layer of copy material successively applied to the copyboard whereby electrostatically laminated pinning of such copy material is effected. |
