Printer with a power paper stacker

A paper stacker for use in combination with a printer comprising:

• a frame which is adapted to surround printed paper sheets without underlying said printed paper sheets as they are being stacked;
• means for moving said frame upwardly with respect to the printed paper sheets being stacked while retaining said printed paper sheets as said frame moves upwardly along the edges of said printed paper sheets and a surface for receiving the printed paper sheets which remains stationary while the frame is moving upwardly;
• paddles within said frame for impinging against the paper at least on two edges thereof;
• and,
• means for driving said paddles in a rotational manner.

A paper stacker in combination with a line printer comprising:

• a line printer having a hammerbank for printing on sheet of paper with a series of hammers on the hammerbank and permanent magnets for retaining said hammers, with coils to overcome the permanent magnetism and print with a ribbon against the sheets of paper;
• a surface for receiving said sheets of paper which has been printed and is to be stacked;
• a frame surrounding the said sheets of paper that has been printed;
• means for raising the frame in surrounding relationship to the sheets of paper after it has been printed in order to maintain the upper portion of the sheets of paper stack within the confines of the frame as said frame moves upwardly, while retaining and not moving the sheets of paper on the surface on which it is stacked where the surface for receiving the sheets of paper remains stationary as the frame is raised;
• and,
• a constant force spring connected to said frame so that as said frame moves upwardly and downwardly, said constant force spring balances it along its path of movement.

A paper stacker in combination with a line printer having a hammerbank with multiple hammers for printing on a series of connected sheets of paper that are to be stacked in a folded relationship after printing comprising:

• a line printer having a hammerbank for reciprocal movement having hammers retained on said hammerbank from release by a permanent magnet, and coils for releasing the hammers by overcoming the permanent magnetism whereby said hammers impinge against a ribbon and an underlying said sheets of paper media to be printed upon;
• a base for receiving said sheets of paper which has been printed on and is to be stacked;
• a movable frame separably movable upwardly from said base surrounding the sheets of paper that has been printed while the base for receiving the sheets of paper remains stationary as the frame is raised;
• a support for the frame;
• means for raising the frame upwardly in relationship to the paper as said frame is supported on the support such that after the sheets of paper has been printed, the frame moves on supports upwardly while retaining and surrounding a portion of the sheets of paper;
• fences within said frame that can adjustably move with respect to the edges of the sheets of paper;
• beam sensors for sensing the height of the sheets of paper to cause the frame to move in response to the height of the sheets of paper;
• a tractor for driving the sheets of paper which has been adapted for driving with perforation holes;
• and,
• a pair of rollers spring biased against each other which are journaled for rotation by movement of the paper between said rollers to iron the tractor paper perforation holes.

A paper stacker for use with a line printer which prints a series of connected sheets of paper that are to be stacked in a folded relationship after printing comprising:

• a surface for receiving said sheets of paper which has been printed and is to be stacked;
• a frame surrounding the sheets of paper that has been printed which moves upwardly in response to the height of the sheets of paper and is in surrounding relationship to the paper;
• pinch rollers which feed the sheets of paper that has been printed having at least one set of drive rollers and one set of idler rollers while the surface for receiving the sheets of paper remains stationary;
• drive rollers formed of a substantially low density material;
• and,
• a drive member for driving said drive rollers at a speed equal to or greater than the emerging speed of the sheets of paper as it emerges from the printer.