Flatbed duplicators

A little while after the invention of the spirit duplicator, in 1935, Shinjiro Horii, an inventor from Tokyo, filed a patent for a flatbed duplicator. 1 This invention refers to a flat duplicator in which a stencil frame is connected to the paper tray of a copier and swivelling at one end. One task of the invention was to provide a duplicator of this type in which the position of the stencil frame could easily be adjusted relative to the bed in any direction horizontally.2 The above-mentioned invention was adopted in modern risographs: the position of the print drums and the master foils respectively, can also be relative to the substrate.3

  1. Shinjiro Horii, Patent US2,066,269, 1936, 1; http://www.freepatentsonline.com/2066269.pdf, last retrieved 25 September 2020.
  2. ibid.
  3. Riso Europe Ltd., RISO MZ 770 User’s Guide (London: Riso Europe Ltd., 2005), 113.