Granted Patent B2

US 6,840,689 · App. 10/281,716 · Granted Jan 11, 2005

Abstract

Claims (62)

1. A thermal printer having a thermal printer head and a platen over which various width print ribbons pass between them comprising:

at least one pivotal support across the width of a print ribbon before or after the passage of said print ribbon over said printer head which can be oriented to provide central pivotal support with respect to the width of said print ribbon;

sensor to determine the width of said print ribbon;

a processor in said thermal printer responsive to the width of the print ribbon;

a ribbon width driver connected to said processor; and,

a ribbon width motor for moving said pivotal support along the various widths of print ribbon to an approximately center position along the width of each print ribbon.

2. The thermal printer of claim 1 , further comprising:

support for a spool of media; a rotatable print ribbon supply spindle for a print ribbon supply spool;

a rotatable take-up spindle for taking up print ribbon and forming a take-up spool from said supply spool as it moves in association with said media between said platen and printer head;

a motor connected to said print ribbon supply spindle having a Back EMF (BEMF);

a ribbon tension driver;

a motor connected to said take-up spindle;

a second processor to provide current settings and engine control to said ribbon tension driver to provide movement and continuous tension of said print ribbon by controlling the movement of said motors during supply and take-up movement of said ribbon;

a print head motor to position said printer head with respect to said platen;

a driver for driving said print head motor; and

a third processor for controlling the amount of pressure by said print head motor placed on said print head in association with said platen.

3. The thermal printer as claimed in claim 2 , wherein:

said second processor calculates a desired tension on said print ribbon on said supply spindle, and tension on print ribbon of said take-up spindle and adjusts their respective velocities.

4. The thermal printer as claimed by claim 2 wherein said second processor calculates a desired tension of the print ribbon on said print ribbon supply spool and said take-up spool and adjusts their respective motor torques.

5. The thermal printer as claimed in claim 2 wherein: said second processor calculates a desired movement of said supply spool based upon the Back EMF (BEMF) of the motor connected thereto.

6. The thermal printer as claimed in claim 2 further comprising:

a fourth processor for determining the amount of ribbon remaining on the respective supply spool and take up spool by calculating the axial velocity of each spool.

7. The thermal printer as claimed in claim 6 further comprising:

a printer control panel; and,

a sensor for providing an output as to the amount of ribbon remaining through current status software connected to said printer control panel.

8. The thermal printer as claimed in claim 2 further comprising:

a print head temperature sensor;

a print intensity driver connected to said print head for providing appropriate temperature of said print head for printing; and,

a fifth processor with current settings for controlling said print intensity driver based upon input from said print head temperature sensor.

9. The thermal printer as claimed in claim 2 further comprising:

a motor for adjusting the printer as to the width of the print ribbon; and,

a sixth processor for controlling the ribbon width driver based upon an input from a host computer, a control panel, or an on board controller.

10. The thermal printer as claimed in claim 2 wherein said second processor having a media usage output based upon the radial velocity of at least one motor.

11. The thermal printer of claim 1 , further comprising:

a temperature sensor to determine the temperature of said printer head;

a print intensity driver; and,

a second processor connected to said print intensity driver for changing the heat of said print head in response to print head temperature.

12. The thermal printer of claim 1 , wherein said printer head has heating elements for dot matrix printing, further comprising:

a temperature sensor to determine the temperature of said printer head with respect to said heating elements;

a print intensity driver; and,

a processor connected to said print intensity driver for changing the heat of said printer head heating elements in response to temperature.

13. The thermal printer as claimed in claim 12 wherein;

said print intensity driver is connected to engine control software which is established by current settings and a pre-established input based upon a desired degree of intensity of the print of said printer.

14. The thermal printer system as claimed in claim 12 further comprising:

a printer verifier which is placed in association with said thermal printer to read printed media and in connected relationship to said print intensity driver to change the heat on the printer head depending upon pre-established printing criteria.

15. The thermal printer as claimed in claim 1 further comprising:

input means to said processor with regard to pre-established widths of print ribbon.

16. The thermal printer as claimed in claim 1 wherein:

said ribbon width sensor as connected to said processor causes a change of the positioning of said support as said ribbon moves over said support to accommodate for variances in ribbon size within a single ribbon.

17. A thermal printer comprising:

a media support for holding media that is to be printed upon;

a spindle for holding and collecting print ribbon of various widths used to print upon said media;

a print head in associated relationship with a platen between which said media and print ribbon can be moved for printing on said media;

at least one centrally oriented pivotal support for said print ribbon before or after said print ribbon passes over said print head pivotally held for support across the width of said ribbon;

a drive for moving the pivotal support along the various widths of print ribbon to an approximately center position along the width of each print ribbon; and,

a processor associated with said drive for causing said drive to move in response to ribbon width and the center of pivotal support.

18. The thermal printer as claimed in claim 17 wherein:

said pivotal support is a roller.

19. The thermal printer as claimed in claim 17 wherein:

said pivotal support is a plate curved in cross-section.

20. The thermal printer as claimed in claim 17 further comprising:

an electronic control for moving the pivotal center automatically with respect to the edge of said ribbon.

Assignments (10)