| 摘要 |
1,057,796. Electrostatic holding devices. SIMCO CO. Inc. April 23, 1965 [April 23, 1964], No. 17227/65. Heading H1P. [Also in Division G2. A copyboard comprises a conductive plate having a non-conductive layer on at least one side thereof, and means for applying a highvoltage D.C. potential to the conductive plate, so that a sheet of material applied to the non- conductive layer will adhere to it. As shown, the copyboard A may consist of a copper plate 16, to which is attached a layer or coating 18 of an insulating material. The plate is connected through a switch 22 to a high-voltage negative D.C. generator 20, so that both plate 16 and layer 18 receive a negative charge. A sheet B, e.g. a print or original to be copied photographically, now placed against layer 18, adheres thereto because of the electrostatic attraction. As a further step an ionising wand 24, connected to a high voltage positive D.C. generator 28, induces a positive charge on sheet B, which remains even after switch 22 is opened. To minimize the possibility of electric shock, a further non-conductive layer (34) (Fig. 3, not shown) is provided on the other side of the metal sheet. Figs. (not shown) 4A-4E, and also Figs. (not shown) 5A-5H, illustrate further methods of charging the copyboard so as to avoid shock to an operator. Fig. 6 (not shown) is a copyboard constructionally modified for the same purpose. |
