Method and system to calculate line feed error in labels on a printer

Abstract

A system to calculate line feed error in labels on a printer includes a holder assembly under the label line feed and before the printer burn line; a first sensor and a second sensor on the holder assembly, a fixed distance, L, between them; and a processor. The first sensor senses a first position of a label edge, L1A. The second sensor senses a second position of the label edge, L1B. The processor calculates the distance, L1AB, between the first position and the second position and calculates the line feed error over the fixed distance, L, by taking the difference (L−L1AB). The processor calculates the feed correction to be done to the label, given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer. The processor instructs the printer line feed to implement the calculated feed correction.

Description

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims the benefit of U.S. patent application Ser. No. 15/270,378 for a Method and System to Calculate Line Feed Error in Labels on a Printer filed Sep. 20, 2016, now U.S. Pat. No. 9,701,140. Each of the foregoing patent application and patent is hereby incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to label printers and in particular to methods and systems of determining line feed errors and correcting line feed errors.

BACKGROUND

Generally speaking instantaneous feed error between the Label Stop Sensor (LSS) and the Thermal Print Head's (TPH) burn line always varies depending upon the type of label, forces acting upon label and ambient conditions. The LSS is a positional sensor, identifying the edge or gap or black mark of the label.

Without instantaneous feed error correction the quality of the print registration would be challenged. Print registration is the accuracy of the position of the printed image on the label and effects print quality.

There are systems known in the art for determining label positions. For example US Publication 20130244872A1 discloses a thermal printer with an optical registration system especially for use with labels having fluorescent stripe patterns. However, no line feed correction calculation is provided for. Likewise, U.S. Pat. No. 8,029,083 discloses a label printer to determine the position of a label. However, the '083 reference makes no provision for the determination and correction of line feed error for the label.

Therefore, a need exists for a system and method of determining the position of labels on the line feed of a label printer, determining the line feed error of the label, and correcting the line feed error before the burn line on the label printer.

SUMMARY

Accordingly, the present invention embraces a method of calculating line feed error of at least one label on a printer.

In an exemplary embodiment, the method comprises the steps of: a) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; b) feeding the label over the first and second sensors on the holder assembly; c) sensing a position of a first edge of the label, L1A, by the first sensor as the label moves over the first sensor; d) sensing a second position of the first edge of the label, L1B, by the second sensor as the label moves over the second sensor; e) calculating the distance, L1AB, between the first position and the second position; f) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and g) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer.

In another exemplary embodiment, the method further comprises the step of h) correcting the line feed based upon the step (f) of calculating the feed correction.

In another exemplary embodiment of the method, the at least one label is every label fed over the first and second sensors.

In another exemplary embodiment of the method, the steps a-h are repeated for every label fed over the first and second sensors.

In yet another exemplary embodiment of the method, the calculating steps e-g and the correcting step are accomplished with a processor.

In another exemplary embodiment of the method, the fixed distance L has a tolerance of about +/−20 microns; that is, the fixed distance is from about L−20 microns to about L+20 microns.

In another exemplary embodiment of the method, the first edge is selected from a leading edge of the label and the trailing edge of the label as the label passes over the holder assembly.

In another aspect, the present invention embraces a method of calculating line feed error in at least one label having an optical feature on a printer.

In an exemplary embodiment, the method comprises the steps of: a) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; b) feeding the label over the first and second sensors on the holder assembly; c) sensing a position of the optical feature of the label, L1A, by the first sensor as the label moves over the first sensor; d) sensing a second position of the optical feature label, L1B, by the second sensor as the label moves over the second sensor; e) calculating the distance, L1AB, between the first position and the second position; f) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and g) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer.

In another exemplary embodiment of the method, the optical feature is a differential opacity of media between an edge of the label and a carrier media.

In another exemplary embodiment of the method, the edge of the label is the leading edge of the label or the trailing edge of the label.

In another exemplary embodiment of the method, the optical feature is a luminescent mark on the label.

In another exemplary embodiment, the method further comprises the step of h) correcting the line feed based upon the step (g) of calculating the feed correction.

In yet another exemplary embodiment of the method, the at least one label is every label fed over the first and second sensors.

In another exemplary embodiment of the method, the steps a-h are repeated for every label fed over the first and second sensors.

In another exemplary embodiment of the method, the fixed distance L, has a tolerance of about +/−20 microns.

In yet another exemplary embodiment of the method, the optical feature is a fluorescent stripe. The fluorescent stripe is disposed at a predetermined position on the label and at the same predetermined position on every label fed over the first and second sensors.

In another aspect, the present invention embraces a system to calculate line feed error in labels on a printer.

In an exemplary embodiment, the system is comprised of: a holder assembly positioned in the printer under the label line feed and before the printer burn line; a first sensor and a second sensor disposed on the holder assembly with a fixed distance, L, between the first sensor and the second sensor; and a processor communicatively linked to the first sensor and the second sensor and to the printer line feed. The first sensor is configured to sense a first position of a first edge of the label, L1A, as the label moves over the first sensor. The second sensor is configured to sense a second position of the first edge of the label, L1B, as the label moves over the second sensor. The processor is configured to calculate the distance, L1AB, between the first position and the second position. The processor is further configured to calculate the line feed error over the fixed distance, L, by taking the difference (L−L1AB). The processor is further configured to calculate the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, and where D is a distance between the first sensor and the burn line of the printer. The processor is yet further configured to instruct the printer line feed to implement the calculated feed correction.

In another exemplary embodiment of the system, the first edge is provided with an optical feature. The first and second sensors are optical sensors sensitive to the optical feature.

In another exemplary embodiment of the system, the optical feature is a differential in opacity of the media.

In another exemplary embodiment of the system, the fixed distance L has a tolerance of about +/−20 microns.

In another exemplary embodiment of the system, the first edge of the label is selected from the leading edge of the label and the trailing edge of the label.

In another aspect, the present invention embraces a system to calculate line feed error on a printer.

In an exemplary embodiment, the system is comprised of: a holder assembly positioned in the printer before a printer burn line, a first sensor and a second sensor disposed on the holder assembly with a fixed distance, L, between the first sensor and the second sensor, and a processor communicatively linked to the first sensor and the second sensor. The first sensor is configured to sense a first position of a first edge of the label, L1A, as the label moves over the first sensor. The second sensor is configured to sense a second position of the first edge of the label, L1B, as the label moves over the second sensor. The processor is configured to calculate a distance, L1AB, between the first position and the second position. The processor is further configured to calculate a line feed error over the fixed distance, L, by taking the difference (L−L1AB).

In another exemplary embodiment of the system, the processor is further configured to calculate the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the printer burn line.

In another exemplary embodiment of the system, the first edge is provided with an optical feature.

In another exemplary embodiment of the system, the optical feature is at least one of a differential in transmissivity of the media or a differential in reflectance of the media.

In another exemplary embodiment of the system, the fixed distance L has a tolerance of about +/−20 microns.

In yet another exemplary embodiment of the system, the first edge of the label is selected from the leading edge of the label and the trailing edge of the label.

In another aspect, the invention embraces a method of calculating line feed error on a printer comprising the steps of: a) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; b) feeding a label near the first and second sensors on the holder assembly; c) sensing a position of a first edge of the label, L1A, by the first sensor as the label moves near the first sensor; d) sensing a second position of the first edge of the label, L1B, by the second sensor as the label moves near the second sensor; e) calculating the distance, L1AB, between the first position and the second position; f) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and g) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and a burn line of the printer.

In another exemplary embodiment, the method further comprises the step of: h) correcting the line feed based upon the step g) of calculating the feed correction.

In another exemplary embodiment of the method, the calculating steps e-g and the correcting step are accomplished with a processor.

In another exemplary embodiment of the method, the fixed distance L has a tolerance of about +/−20 microns.

In yet another exemplary embodiment of the method, the first edge is selected from a leading edge of the label and the trailing edge of the label as the label passes near the holder assembly.

In another aspect, the invention embraces another method of calculating line feed error on a printer comprising the steps of: a) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; b) feeding a label having an optical feature near the first and second sensors on the holder assembly; c) sensing a position of the optical feature, L1A, by the first sensor as the label moves near the first sensor; d) sensing a second position of the optical feature, L1B, by the second sensor as the label moves near the second sensor; e) calculating a distance, L1AB, between the first position and the second position; f) calculating a line feed error over the fixed distance, L, by taking the difference (L−L1AB); and g) calculating a feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer.

In another exemplary embodiment of the method, the optical feature is at least one of a differential transmissivity or a differential in reflectance between an edge of the label and a carrier media.

In another exemplary embodiment, the method further comprises the step of h) correcting the line feed based upon the step g) of calculating the feed correction.

In another exemplary embodiment of the method, the fixed distance L has a tolerance of about +/−20 microns.

In another exemplary embodiment of the method, the edge of the label is selected from the leading edge and the trailing edge of the label.

In yet another exemplary embodiment of the method, the optical feature is a fluorescent stripe. The fluorescent stripe is disposed at a predetermined position on the label and at the same predetermined position on every label fed near the first and second sensors.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts the hardware portion of a system for calculating line feed error in labels on a printer in accordance with an exemplary embodiment of the present invention.

FIG. 2 schematically depicts a portion of a string of typical labels on a carrier media which could be used in conjunction with exemplary embodiments of the present invention.

FIG. 3 schematically depicts in a flowchart the functions of the hardware portion of the system for calculating line feed error in labels on a printer in accordance with an exemplary embodiment of the present invention depicted in FIG. 1.

FIG. 4 schematically depicts in a flowchart a method for calculating line feed error of at least one label on a printer in accordance with one exemplary embodiment of the present invention.

FIG. 5 schematically depicts in a flowchart another method for calculating line feed error of at least one label with an optical feature on a printer in accordance with another exemplary embodiment of the present invention.

DETAILED DESCRIPTION

The present invention embraces a system to calculate line feed error in labels on a printer.

In an exemplary embodiment, referring to FIG. 1, the system (10) is comprised of a holder assembly (20), with a first sensor, designated A (21), and a second sensor, designated B (22), disposed within the holder assembly (20) at a fixed distance, L (23) from each other. The fixed distance L preferably has a tolerance of +/−20 microns.

The holder assembly (20) is positioned in the printer under the feed line (14) where the label media (30) passes over the first sensor A (21) and the second sensor B (22) as the label media (30) progresses towards the burn line (16). The burn line (16) is a distance D (18) from the first sensor.

The label media (30), which can be seen in more detail in FIG. 2, is comprised of a carrier (33) and labels (34). Each label (34) has a leading edge (31) and a trailing edge (32). Generally, there is a difference in opacity between the carrier (33) and the labels (34).

Referring again to FIG. 1, the first sensor A (21) senses a first position (24) of an optical feature of a label (34) passing over the first sensor A (21). The second sensor B (22) senses a second position (25) of the same optical feature of the label (34) as the label (34) passes over the second sensor B (22). The optical feature may be the difference in opacity of the label (34) and the carrier (33). Thus the particular optical feature sensed by the first sensor A (21) at the first position (24) is either the leading edge (31) or the trailing edge (32) of the label (34). Accordingly, the same leading edge (31) or trailing edge (32) is sensed by the second sensor B (22) at the second position (25).

In another exemplary embodiment, as shown in FIG. 2, the optical feature may be a fluorescent stripe (35).

Referring now to FIG. 3, the system (10), whose hardware is depicted in the previous figures, has system functions which are depicted in the instant Figure. Sensor A (21) senses a first position of an optical feature of a label, the function and sensed data being designated (21a). In the present case, the optical feature is the first edge of the label. The second sensor B (22) senses a second position of the first edge of the label. This function and sensed data is designated (22a). The Sensor A (21) and Sensor B (22) are communicatively linked to a Processor (40). The communicative links are shown as arrows between the sensors (21 and 22) and the processor (40). The processor (40) receives the sensed data (21a and 22a) from the sensors (21 and 22). The processor (40) is configured to (41) calculate the distance, L1AB, between the first position and the second position. The processor (40) is further configured to (42) calculate the line feed error over the fixed distance, L, by taking the difference (L−L1AB). The processor (40) is yet further configured to (43) calculate the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer. Finally, the processor is configured to (44) instruct the printer line feed (50) to implement the calculated feed correction (43).

In another aspect, the present invention embraces a method of calculating line feed error of at least one label on a printer. The method of the hereinafter exemplary embodiment may advantageously employ the hardware and software function described hereinbefore in conjunction with FIGS. 1-3.

Referring now to FIG. 4, in an exemplary embodiment, the method (200) is comprised of steps: (210) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; (220) feeding the label over the first and second sensors on the holder assembly; (230) sensing a position of the optical feature of the label, L1A, by the first sensor as the label moves over or near the first sensor; (240) sensing a second position of the optical feature label, L1B, by the second sensor as the label moves over or near the second sensor; (250) calculating the distance, L1AB, between the first position and the second position; (260) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and (270) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer.

In another exemplary embodiment, the method (200) further includes the step of: (280) correcting the line feed based upon the step (270) of calculating the feed correction.

In another exemplary embodiment, the method (200) further includes the step of repeating steps (210-280) for every label fed over the first and second sensors.

In the method (200) the at least one label is every label fed over or near the first and second sensors. Thus the method is used continuously and repeatedly for every label feed through the printer.

In the method (200) the calculating steps (250-270) are accomplished with a processor as described hereinbefore with respect to the system.

In the method (200), the fixed distance, L, has a tolerance of about +/−20 microns.

In the method (200), the first edge may be the leading edge of the label as the label passes over or near the holder assembly. Alternatively, the first edge may be the trailing edge of the label as the label passes over or near the holder assembly.

In another exemplary embodiment, referring now to FIG. 5, a method (300) of calculating line feed error in at least one label having an optical feature on a printer is provided.

In an exemplary embodiment, the method (300) comprises the steps of: (310) providing a first sensor and a second sensor on a holder assembly with a fixed distance, L, between the first sensor and the second sensor; (320) feeding the label over or near the first and second sensors on the holder assembly; (330) sensing a position of the optical feature of the label, L1A, by the first sensor as the label moves over or near the first sensor; (340) sensing a second position of the optical feature label, L1B, by the second sensor as the label moves over or near the second sensor; (350) calculating the distance, L1AB, between the first position and the second position; (360) calculating the line feed error over the fixed distance, L, by taking the difference (L−L1AB); and (370) calculating the feed correction to be done to the label, where the feed correction is given by [(L−L1AB)/L]×D, where D is a distance between the first sensor and the burn line of the printer.

In another exemplary embodiment, the method (300) may further comprise the step of (280) correcting the line feed based upon the step (270) of calculating the feed correction.

In another exemplary embodiment, the method (300) includes the step of (390) repeating steps (310-380) for every label fed over or near the first and second sensors.

In the method (300), the optical feature is a differential opacity of media between an edge of the label and a carrier media. Thus, the sensors are sensing either the position of leading edge of each label, or sensing the trailing edge of each label.

In another exemplary embodiment of the method (300) the optical feature is a fluorescent stripe. The fluorescent stripe is disposed at a predetermined position on each label, and at the same predetermined position on every label fed over or near the first and second sensors.

In any of the embodiments of the method (300) described hereinbefore, the fixed distance L has a tolerance of about +/−20 microns.

In any of the embodiments of the method (300) described hereinbefore, the at least one label is every label fed over or near the first and second sensors.

In any of the embodiments of the method (300) described hereinbefore, the calculating steps (350-370) are preferably accomplished by the printer's processor.

To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.

Claims

1. A method of calculating line feed error on a printer comprising the steps of: a) providing a first sensor and a second sensor under a feed line, wherein the first sensor and the second sensor are separated by a fixed distance;b) sensing a first position of a first optical feature of a label by the first sensor as the label moves near the first sensor;c) sensing a second position of the first optical feature of the label by the second sensor as the label moves near the second sensor;d) calculating a deviation between the fixed distance and distance between the first position and the second position calculation;e) calculating a ratio of the calculated deviation with respect to the fixed distance; andf) calculating a feed correction by applying the ratio to a distance value, wherein the distance value is a distance between the first sensor and a burn line of the printer.

2. The method of claim 1, comprising the step of g) correcting the line feed based upon the step f) of calculating the feed correction.

3. The method of claim 2, wherein the calculating steps d-f and the correcting step are accomplished with a processor.

4. The method of claim 1, wherein the fixed distance has a tolerance of about +/−20 microns.

5. The method of claim 1, wherein the first optical feature is defined as a change in the opacity between label and edge.

6. The method of claim 1, wherein the first optical feature is a fluorescent stripe, the fluorescent stripe being disposed at a predetermined position on the label and at the same predetermined position on every label fed near the first and second sensors.

7. The method of claim 1, wherein the deviation is defined as the difference between the fixed distance and the distance between the first position and the second position calculation.

8. A method of calculating line feed error on a printer comprising: sensing, with a first sensor, a first position of an optical feature of a label as the label moves in a feed line;sensing, with a second sensor, a second position of the optical feature of the label as the label moves in the feed line, wherein the first sensor and the second sensor are separated by a fixed distance;calculating a distance between the first position and the second position; andcalculating a line feed error by subtracting the calculated distance from the fixed distance.

9. The method of claim 8, comprising calculating a feed correction by dividing the calculated line feed error by the fixed distance and multiplying the quotient by a distance between the first sensor and a printer burn line.

10. The method of claim 9, comprising correcting the line feed based on the calculated feed correction.

11. The method of claim 8, wherein the optical feature is at least one of a differential transmissivity or a differential in reflectance between an edge of the label and a carrier media.

12. The method of claim 8, wherein the fixed distance has a tolerance of about +/−20 microns.

13. The method of claim 8, wherein the optical feature of the label is selected from the leading edge and the trailing edge of the label.

14. The method of claim 13, wherein the optical feature is a fluorescent stripe.

15. A system to calculate line feed error on a printer, comprising: a first sensor and a second sensor separated by a fixed distance;the first sensor being configured to sense a first position of a first optical feature of a label as the label moves near the first sensor;the second sensor being configured to sense a second position of the first optical feature of the label as the label moves near the second sensor; anda processor communicatively linked to the first sensor and the second sensor, the processor being configured to: calculate a deviation between the fixed distance and distance between the first position and the second position calculation;calculate a ratio of the calculated deviation with respect to the fixed distance; andcalculate a feed correction by applying the ratio to a distance value, wherein the distance value is a distance between the first sensor and a burn line of the printer.

16. The system of claim 15, wherein the processor is further configured to correct the line feed based upon the calculated feed correction.

17. The system of claim 15, wherein the first optical feature is at least one of a differential transmissivity or a differential in reflectance between an edge of the label and a carrier media.

18. The system of claim 15, wherein the fixed distance has a tolerance of about +/−20 microns.

19. The system of claim 15, wherein the first optical feature of the label is defined as a change in the opacity between label and edge.

20. The system of claim 15, the first optical feature is a fluorescent stripe, the fluorescent stripe being disposed at a predetermined position on the label and at the same predetermined position on every label fed near the first and second sensors.