Frame line inserting circuit for printer

A frame line insertion circuit, comprising:

• counter means coupled to receive column pixels and row pixels of an input video signal, for counting a number of vertical synchronization signals of video signals to produce therefrom a first logic signal, said number of vertical synchronization signals corresponding to a period for inserting a vertical frame-line, and for counting a number of horizontal synchronization signals of said video signals to produce therefrom a second logic signal, said number of horizontal synchronization signals corresponding to a period for inserting a horizontal frame-line;
• gating means coupled to said counter means for producing a third logic signal from a combination of said first and second logic signals;
• memory means having at least one data set prepared to designate selected color for use in said vertical and horizontal frame-lines upon printing said video signals in the printer;
• and
• switching means coupled to receive said video signals line-by-line, for selecting an input under control of said third logic signal to a line memory, said input corresponding to either one of the input video signal or said at least one data set from said memory means.

A frame line insertion circuit, comprising:

• counter means coupled to receive column pixels and row pixels of an input video signal, for counting numbers of horizontal and vertical synchronization signals of said video signal to produce horizontal and vertical frame-line signals indicative of selected horizontal and vertical printing starting points and ending points on a printable medium, based upon numbers of said column pixels and row pixels per frame;
• memory means having data indicative of a selected color component for use in printing said vertical and horizontal frame-line signals;
• and
• means coupled to receive said input video signal line-by-line for printing said video signal within said selected horizontal and vertical printing starting points and ending points on said printable medium, and receiving said data indicative of said selected color component for printing said horizontal and vertical frame-line signals at said horizontal and vertical starting points and ending points of said printable medium.

A frame line insertion circuit for a printer having a line memory for temporarily storing video signals on a line-by-line basis, comprising:

• first counter means coupled to receive first clock signals of said video signals and counting a number of pixels per column line of said video signal to determine vertical framelines representative of vertical boundaries separating a vertical printable area from first and second vertical non-printable areas within a printable medium, said vertical frame-lines corresponding to a first period for inserting said vertical frame-lines at said vertical boundaries;
• second counter means coupled to receive second clock signals of said video signals and determining horizontal frame-lines representative of horizontal boundaries separating a horizontal printable area from first and second horizontal non-printable areas within said printable medium, said horizontal frame-lines corresponding to a second period for inserting said horizontal frame-lines within said horizontal boundaries;
• and
• switching means for responding to said vertical and horizontal frame-lines by enabling transmission of selectable color data to said line memory during said first and second periods for inserting said vertical and horizontal frame-lines representative of said vertical and horizontal boundaries of said printable medium, said vertical and horizontal boundaries forming a window within said printable medium separating a printable area from a non-printable area, said window having a third period representative of said printable area, said switch means enabling transmission of said input video signals to said line memory during said third period representative of said printable area.