Writing plotting apparatus with keyboard

An integral writing/plotting recording apparatus, comprising:

• a main housing;
• a keyboard mounted to said main housing and having character keys corresponding to characters, function keys, and mode selecting means for selecting one of a writing mode and a plotting mode, said character keys including letter keys corresponding to letters, and numeral keys corresponding to numerals, said function keys including a start key;
• a paper feeding device mounted to said housing for feeding a sheet of paper;
• a carriage mounted to said housing for supporting a writing instrument, such that the carriage is movable in a direction substantially perpendicular to a feeding direction of said sheet of paper;
• a carriage driving device for reciprocating said carriage in said substantially perpendicular direction;
• a writing-instrument driving device for moving said writing instrument between a first position in which the writing instrument is in contact with said sheet of paper, and a second position in which the writing instrument is held away from the sheet of paper;
• a character pattern memory within said housing for storing sets of character data representative of patterns of said characters;
• a graphic pattern memory within said housing for storing sets of graphic pattern data respectively representative of a plurality of graphic patterns selected from the group consisting of a bar graph, a broken-line graph and a circular graph, said plurality of graphic patterns being selected by said numeral keys;
• a graph memory within said housing for storing numerical graph data which is entered through said numeral keys and which is plotted in the selected graphic pattern;
• and
• control means within said housing for receiving input data from said keys and mode selecting means of said keyboard and controlling said paper feeding device, carriage driving device and writing-instrument driving device, responsive to said input data including said numerical graph data, according to the following steps:
• (a) waiting for entry of first input data through said keyboard;
• (b) determining if the apparatus is already in said plotting mode;
• (c) if the apparatus is not already in said plotting mode, determining if said mode selecting means has been operated to select said plotting mode and, if so, establishing said plotting mode;
• (d) when said first input data is entered, and if the apparatus is already in said plotting mode or if said plotting mode has been established by said mode selecting means, checking if the first input data is a first set of numerical data entered through at least one of said numeral keys and, if so, reading in from said graphic pattern memory the set of graphic pattern data which corresponds to a graphic pattern designated by said first set of numerical data;
• (e) when second input data is entered after said first set of numerical data has been entered, checking if the second input data is another set of numerical data and, if so, storing said another set of numerical data as said numerical graph data in said graph memory;
• (f) repeating step (e) until said start key has been operated;
• (g) if said start key has been operated in said plotting mode, controlling said paper feeding device, said carriage driving device and said writing-instrument driving device to print a graph according to the set of graphic pattern data which has been read in, and said numerical graph data stored in said graph memory;
• and
• (h) if the apparatus is not already in said plotting mode, and if said mode selecting means has not been operated to select said plotting mode, performing in a writing mode by reading in from said character pattern memory the sets of character pattern data corresponding to the character keys operated, and controlling said paper feeding device, carriage driving device and writing-instrument driving device so as to print said characters on said sheet of paper.