CROSS-REFERENCE TO RELATED APPLICATION
The present application claims the benefit of Singapore Patent Application No. 10201408779P for a Thermal Printer Including Heater for Pre-Heating Print Media filed Dec. 29, 2014, which is hereby incorporated by reference in its entirety.
FIELD OF THE INVENTION
This application is generally related to thermal printing systems, and, more specifically, to direct thermal printing systems used in mobile receipt printing applications.
BACKGROUND
Direct-thermal print media sensitivity is highly temperature related. In certain print conditions, such as extreme cold, excessive energy is required from the thermal print head, causing printing errors and/or slowing print time. This issue is also present for certain print media that require very high energy to receive an image. In certain cases, these issues can also be found in thermal ink transfer printing systems.
If a thermal printing system could stabilize energy requirements for thermal print heads in a variety of temperatures and printing conditions, printing errors could be reduced and overall print quality could be improved.
SUMMARY
In an aspect of the invention, a thermal printer comprises a rotatable printhead platen; a thermal printhead mounted in cooperative association with the printhead platen, the printhead having an upstream side and a downstream side; a continuous web of thermal print media passing between the printhead platen and the printhead, the thermal printhead being operable for creating an image directly on the print media; a print media drive mechanism operable to draw the print media past the printhead in a downstream direction; a print media heating device positioned upstream of the printhead, the print media heating device being operable for pre-heating the print media to a predetermined temperature prior to printing.
In an embodiment, the print media heating device is adjacent to the printhead.
In an embodiment, the continuous web of print media is a roll media.
In another embodiment, the print media heating device is a heated plate and the print media passes over the heated plate and is in thermal contact with the heat plate.
In an embodiment, the drive mechanism directly drives the printhead platen.
In an embodiment, the thermal printer comprises a continuous web of thermal ink transfer film passing between the print media and the printhead, the thermal printhead being operable for transferring ink from the transfer film onto the print media to create an image on the print media.
In another aspect of the invention, a method of thermal printing comprises providing a thermal printer having a thermal printhead and a continuous web of thermal print media passing beneath the printhead, the thermal printhead being operable for creating an image directly on the print media; and heating the print media to a predetermined temperature prior to printing.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described by way of example, with reference to the accompanying Figures, of which:
FIG. 1 is a schematic plan view of a direct thermal printer; and
FIG. 2 is a schematic plan view of an ink transfer thermal printer.
DETAILED DESCRIPTION
Referring now to the drawings, an exemplary embodiment of the thermal printer is illustrated and generally indicated at 10 in FIG. 1.
The thermal sensitivity of direct-thermal print media is temperature related. An optical density (darkness) of an image created increases with higher temperatures applied to the media. Accordingly, individual dots of the thermal printhead need to be precisely controlled to deliver energy sufficiently high enough to darken the print media. However, in certain conditions, such as extreme cold, the calibrated operating ranges may be ineffective for producing an image, i.e. the printhead does not deliver enough energy to heat the media sufficiently to create the image. This issue can sometimes be worse with certain print media that have very high energy requirements.
The direct-thermal printing system 10 and method improve printing quality over conventional systems and methods, because the print media is pre-heated to a predetermined temperature prior to printing. The pre-heating steps reduces the amount of energy required to print on the media and generally improves both print quality and print speed in both desktop and portable direct-thermal printing systems.
Referring to FIG. 1, the direct-thermal printer 10 includes a rotatable printhead platen 12 and a thermal printhead 14 mounted in cooperative association with the printhead platen 12.
The printhead 14 has an upstream (input) side and a downstream (output) side.
A continuous web of direct-thermal print media 16 passes between the printhead platen 12 and the printhead 14 (from right to left on the Figures) where the thermal printhead 14 is operated (energized) to heat individual printhead dots (not labeled) and thereby thermally create an image directly on the print media 16. In the exemplary embodiment, the web 16 is a roll of media. However, the media may be fan-fold or other continuous formats.
The printhead 14 is mounted for movement between an engaged printing position (as shown in FIG. 1) where the printhead 14 is engaged with the platen 12 and captures the print media 16 between the printhead 14 and the printhead platen 12, and a disengaged loading position (not shown) where the printhead 14 is spaced from the platen 12 for loading of the print media 16. In accordance with various known types of thermal printers, the printhead 14 is pivotably mounted for movement between the engaged and disengaged positions and is spring biased to create sufficient friction with the platen 12 to draw the print media therebetween.
A print media drive mechanism 18 operates to drive the printhead platen 12 and draw the print media 16 by friction past the printhead 14 in a downstream direction. In the exemplary embodiment as shown, the printhead platen 12 rotates counterclockwise thus moving the print media 16 from right to left (see arrow 20). The drive mechanism 18 directly drives a shaft (not shown) of the platen 12, or alternatively, the drive mechanism 18 may drive a belt (not shown), which in turn drives the platen 12. The system 10 is not limited to any specific configuration. In other printer configurations, a separate set of drive platens may be provided on the downstream side to draw the print media 16 past the printhead 14.
To stabilize and reduce the print energy required by the printhead 14 to create an image on the print media 16, a heating device 22 is positioned immediately upstream of the printhead 14 whereby the print media 16 is pre-heated to a predetermined temperature prior to printing. In the exemplary embodiment, the heating device 22 is a heated plate over which the media 16 passes and absorbs heat therefrom. In an embodiment, the heating device plate 22 is heated by conventional resistance heating. In other embodiments, the heating device plate 22 may be heated by over conventional heating methods. Other exemplary embodiments include heated rotatable platens, and/or heating elements and a fan system which would force warm air over the surface of the print media 16 immediately prior to printing or during printing.
As indicated above, pre-heating of the media 16 elevates the print media temperature to a known temperature, thus reducing the energy required from the printhead 14 to exceed the print energy threshold and create an image on the print media 16.
Turning to FIG. 2, in another exemplary embodiment, indicated at 10A, the thermal printer 10A is an ink transfer thermal printer and includes a continuous web of thermal ink transfer film 24 passing between the print media 16 and the printhead 14. Otherwise, the general construction and function of the printer is the same as the earlier embodiment. The thermal printhead 14 in this embodiment, is operable for transferring ink from the transfer film 24 onto the print media 16 to create an image on the print media 16.
Pre-heating of the media 16 in this embodiment also elevates the temperature of the print media, thus reducing the energy required from the printhead 14 to melt and transfer the ink from the transfer film 24 onto the print media 16 to create image on the print media 16.
While there is shown and described herein certain specific structure embodying the thermal printing system, it will be manifest to those skilled in the art that various modifications and rearrangements of the parts may be made without departing from the spirit and scope of the underlying inventive concept and that the same is not limited to the particular forms herein shown and described except insofar as indicated by the scope of the appended claims.
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