Device for photocopying parts of documents

A pocket-sized device for photocopying parts of texts or diagrams on a reproduction base material, by linear displacement of the device with respect to a document, comprising:

• at least two incremental wheels wherein a first wheel rolls without sliding on the base material of the document to be reproduced and a second wheel rolls on the reproduction base material, the rotation of said first and second wheels furnishing a time base for the acquisition and restoration of data;
• a matrix pickup, having a window, for picking up and reading the part of the document to be reproduced.
• an electronic device for inputting data coming from the matrix pickup serially into a memory;
• a means for multiplexing the data output from the memory;
• a matrix printing system controlled by the amplifier-multiplexer, the matrix pickup and the matrix printing system having the same matrix arrangement;
• a clock controlled by the time base, furnished by the rotation of said incremental wheels, said clock controlling the transfers, at each clock interval, of data acquired by the pickup to the memory on the course of the reading cycle, and then from the memory to the printing system in the course of the printing cycle;
• and
• at least one shutter placed before the window of the pickup, the shutter being movable to adjust the width of the photocopied area on the document to be reporduced to a desired width.