Reciprocating drafting pen

Drafting pen apparatus suitable for stippling or drawing interrupted lines comprising a barrel;

• piston means disposed within said barrel and longitudinally movable therein over a stroke length;
• adjustable piston stop means for selectively limiting the stroke length of said piston means;
• a drawing pen device attached to said piston means and movable therewith having an ink reservoir and a pen nib extending out one end of said barrel for applying ink to a medium when the nib is in contact therewith;
• a guide foot at said one end of the barrel and adjustably connected thereto for maintaining a desired standoff between the barrel and the medium;
• and electromechanical drive means for longitudinally moving said piston means, and with it said drawing pen device, such that said nib is brought into contact and out of contact with said medium;
• wherein said adjustable piston stop means includes plug means disposed in said barrel for blocking the stroke of said piston means, and setting means outside said barrel and coupled to the plug means through an elongated slot in the barrel, for setting the position of said plug means.

Drafting pen apparatus for stippling or drawing dotted or broken lines or the like on a sheet of drafting medium, comprising a barrel;

• piston means disposed within said barrel and longitudinally movable therein over a stroke length;
• a drawing pen device attached to said piston means and movable therewith having an ink reservoir and a pen nib extending out one end of said barrel for applying ink to said medium when the nib is in contact therewith;
• guide foot means adjustably mounted at said one end of the barrel for maintaining a desired standoff between the barrel and the medium;
• piezoelectric drive means bending under the influence of an applied electric voltage to urge said piston longitudinally, such that the drawing pen device moves with it and said nib is brought into contact and out of contact with said medium;
• and drive voltage supply means for applying a drive voltage to said piezoelectric drive means.

Hand-held drafting pen apparatus for drawing interrupted lines, comprising a barrel;

• a technical pen slidably disposed within the barrel and including an ink reservoir and a pen nib extending from one end of the barrel for applying ink to a medium when the nib is in contact therewith;
• a guide foot adjustably mounted on said one end of said barrel and extending generally axially relative to the barrel for maintaining a desired standoff of said one end of the barrel from the surface of said medium;
• piston means attached to said technical pen and slidably disposed within the barrel;
• electrically powered drive means within said barrel for moving said piston relative to said barrel such that said technical pen nib is brought alternately into contact and out of contact with said medium;
• power supply means contained within said barrel supplying electrical drive power to said electrically powered drive means;
• and switch means disposed on said barrel for selectively actuating said drive means when interrupted lines are desired to be drawn.

Drafting pen apparatus for stippling or drawing dotted or broken lines or the like on a sheet of drafting medium, comprising a barrel;

• piston means disposed within said barrel and longitudinally movable therein over a stroke length;
• a drawing pen device attached to said piston means and movable therewith having an ink reservoir and a pen nib extending out one end of said barrel for applying ink to said medium when the nib is in contact therewith;
• piezoelectric drive means bending under the influence of an applied electric voltage to urge said piston longitudinally, such that the drawing pen device moves with it and said nib is brought into contact and out of contact with said medium;
• and drive voltage supply means for applying drive voltage to said piezoelectric drive means.