| 摘要 |
952,326. Stencils. BURROUGHS CORPORATION. Dec. 30, 1959 [Dec. 31, 1958], No. 44320/59. Heading B6C. [Also in Division G2] Electrostatic images produced by a dotprinting discharge head 46 as in Specifications 893,843 and 893,845 on a polythene coating on a paper strip rendered conductive by loading with carbon are developed by passage of the strip 40 upwardly through an electrically neutral developing non-friable powder 64 (see Division G2), powder adhering to the non- charged areas of the strip being detached by a strip vibrator 66 and a suction cleaner 70. The developed images are then fixed by passage between rollers 80, 82 which force the powder into the polythene coating. Typically the developing powder is formed of metal coated glass beads which may be darkened as by sulphiding or carbon-coated ceramic clay particles of diameter 10 to 80 Á. The developed strip 104 may be used to cut a stencil by passing the assembly of strip 104, perforatable stencil 132 and backing sheet 134 between pressure rollers 140, 142.
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