摘要:
In a liquid ink printer, two printing-medium (30) guide systems restrain the medium. One (21) is in an area upstream along the direction of medium advance (33) from the pen (11,34) and extending laterally across the width of the medium (30) except in one or more regions that are laterally near the engagement of a print-medium advancing device (24, 25). The other guide system (23) is disposed laterally from the pen (11, 34), and extends laterally across the medium only in one or more regions that are laterally near the engagement of the advancing device (24, 25). The first guide system (21) restrains the medium (30) over an area that stops short of the lateral edges (35) and the second guide system (23) is bifurcated (23L, 23R) and disposed laterally in two directions from the pen (11, 34), and restrains the medium across only the lateral edges (35) of the medium. A human-actuable control (52) selects a print-medium (30, 30') width, and shifts (23L, 23R') at least one bifurcation (23L) of the second guide system (23). A tensioning system (26, 27) longitudinally beyond the marking head (11, 34) from the medium advancing device (24, 25) and generally aligned laterally with that device, tensions the medium (30) away from the advancing device (24, 25) to hold the medium (30) taut at the pen (11, 34). When tensioned, the medium moves a normal distance (41) through the apparatus at each operation of the advancing device (24, 25) ; but after a trailing edge (32) of the medium (30) passes the advancing device (24, 25), the advance distance is decreased (42) preferably by about half).
摘要:
Images are printed using marks formed in pixel arrays by a scanning print head. For transparent and glossy media, with poor absorbance, drying is enhanced by a multipass (preferably six-pass) print mode in which the total number of ink drops or spot is allocated among correspondingly multiple masks, though some may be duplicates. To further hasten drying, heat is applied --through the medium, from the opposite side as that on which ink is deposited -- but the amount of heat is strictly moderated, particularly for nontransparent glossy media, to accommodate the hypersensitivity of these media to heat-induced warping. Heating for glossy media is preferably restricted to about one-third the power used for drying plain paper. Convective drying too is promoted, by operating a fan over the printed image. Certain special techniques well-suited for plain-paper printing have been found undesirable for use with plastic media; these techniques include so-called "resolution-enhanced technology", bidirectional printing (particularly of black), and optical-density controlled printing speed. At top and bottom of each page or sheet of printing medium, where it is undesirable to operate with the pen partly off the edge of the sheet, and where also the printing medium is constrained from only one direction rather than being held taut beneath the pen, the print mask is rotated while the printing medium is held stationary -- thereby entirely avoiding reliance upon accuracy of print-medium advance.
摘要:
In a liquid ink printer, two printing-medium (30) guide systems restrain the medium. One (21) is in an area upstream along the direction of medium advance (33) from the pen (11,34) and extending laterally across the width of the medium (30) except in one or more regions that are laterally near the engagement of a print-medium advancing device (24, 25). The other guide system (23) is disposed laterally from the pen (11, 34), and extends laterally across the medium only in one or more regions that are laterally near the engagement of the advancing device (24, 25). The first guide system (21) restrains the medium (30) over an area that stops short of the lateral edges (35) and the second guide system (23) is bifurcated (23L, 23R) and disposed laterally in two directions from the pen (11, 34), and restrains the medium across only the lateral edges (35) of the medium. A human-actuable control (52) selects a print-medium (30, 30') width, and shifts (23L, 23R') at least one bifurcation (23L) of the second guide system (23). A tensioning system (26, 27) longitudinally beyond the marking head (11, 34) from the medium advancing device (24, 25) and generally aligned laterally with that device, tensions the medium (30) away from the advancing device (24, 25) to hold the medium (30) taut at the pen (11, 34). When tensioned, the medium moves a normal distance (41) through the apparatus at each operation of the advancing device (24, 25) ; but after a trailing edge (32) of the medium (30) passes the advancing device (24, 25), the advance distance is decreased (42) preferably by about half).
摘要:
Images are printed using marks formed in pixel arrays by a scanning print head. Certain special techniques well-suited for plain-paper printing have been found undesirable for use with plastic media; these techniques include so-called "resolution-enhanced technology", bidirectional printing (particularly of black), and optical-density controlled printing speed. At top and bottom of each page or sheet of printing medium, where it is undesirable to operate with the pen partly off the edge of the sheet, and where also the printing medium is constrained from only one direction rather than being held taut beneath the pen, the print mask is rotated while the printing medium is held stationary -- thereby entirely avoiding reliance upon accuracy of print-medium advance.
摘要:
Images are printed using marks formed in pixel arrays by a scanning print head. For transparent and glossy media, with poor absorbance, drying is enhanced by a multipass (preferably six-pass) print mode in which the total number of ink drops or spot is allocated among correspondingly multiple masks, though some may be duplicates. To further hasten drying, heat is applied --through the medium, from the opposite side as that on which ink is deposited -- but the amount of heat is strictly moderated, particularly for nontransparent glossy media, to accommodate the hypersensitivity of these media to heat-induced warping. Heating for glossy media is preferably restricted to about one-third the power used for drying plain paper. Convective drying too is promoted, by operating a fan over the printed image. Certain special techniques well-suited for plain-paper printing have been found undesirable for use with plastic media; these techniques include so-called "resolution-enhanced technology", bidirectional printing (particularly of black), and optical-density controlled printing speed. At top and bottom of each page or sheet of printing medium, where it is undesirable to operate with the pen partly off the edge of the sheet, and where also the printing medium is constrained from only one direction rather than being held taut beneath the pen, the print mask is rotated while the printing medium is held stationary -- thereby entirely avoiding reliance upon accuracy of print-medium advance.
摘要:
Images are printed using marks formed in pixel arrays by a scanning print head. Certain special techniques well-suited for plain-paper printing have been found undesirable for use with plastic media; these techniques include so-called "resolution-enhanced technology", bidirectional printing (particularly of black), and optical-density controlled printing speed. At top and bottom of each page or sheet of printing medium, where it is undesirable to operate with the pen partly off the edge of the sheet, and where also the printing medium is constrained from only one direction rather than being held taut beneath the pen, the print mask is rotated while the printing medium is held stationary -- thereby entirely avoiding reliance upon accuracy of print-medium advance.