Patent Grant
11900201
The present invention relates to printers, and more particularly, to methods, apparatuses, and systems for providing print quality feedback in response to verifying the print quality of printers and controlling the print quality of machine-readable indicia, including printed barcodes and printed OCR-B characters.
Applicant has identified many deficiencies and problems associated with existing printers. For example, a print error (or a “print quality problem”) may be introduced into the machine-readable indicia for many reasons. Print quality problems are particularly acute in the case of barcode printing, as the barcode encodes data in the width of the bar and space elements.
Various embodiments described herein relate to methods, apparatuses, and systems for providing print quality feedback and controlling print quality of machine-readable indicia.
In accordance with various embodiments, a printer-verifier system for providing print quality feedback and controlling print quality is provided. The printer-verifier system comprising: a printing mechanism configured to print a machine-readable indicia on a print media; a verifier device in electronic communication with the printing mechanism, the verifier device being configured to scan the machine-readable indicia on the print media; a print quality monitoring device in electronic communication with the printing mechanism and the verifier device, the print quality monitoring device being configured to: analyze the print quality of the machine-readable indicia on the print media; determine that the print quality of the machine-readable indicia does not meet predetermined quality standards; and in response to determining that the print quality does not meet the predetermined quality standards, instruct the printing mechanism to print diagnostic information on the print media.
In some embodiments, the diagnostic information comprises at least one of gray levels, ANSI grade levels, numeric ANSI grades, and bar width growth amounts.
In some embodiments, the print quality monitoring device is configured to utilize the diagnostic information to detect errors in the print quality.
In some embodiments, the diagnostic information comprises instructions defining an appropriate course of at least one corrective action, and the at least one corrective action comprises at least one of changing pressure that a printhead of the printing mechanism applies to the print media, changing a temperature of the printhead, cleaning the printhead, repairing the printhead, replacing the printhead, realigning the print media within the printing mechanism, and realigning a printer ribbon within the printing mechanism.
In some embodiments, the print media comprises at least one label, and the machine-readable indicia comprises at least one barcode.
In some embodiments, in response to determining that the print quality does not meet the predetermined quality standards, the print quality monitoring device is further configured to instruct the printing mechanism to print the diagnostic information over the machine-readable indicia on the print media.
In some embodiments, when analyzing the print quality of the machine-readable indicia on the print media, the print quality monitoring device is further configured to: identify a print quality problem associated with the machine-readable indicia; retrieve association data that associates each of a plurality of print quality problems with a plurality of prescribed corrective actions; and determine a prescribed corrective action from the plurality of prescribed corrective actions based on the association data.
In some embodiments, in response to determining that the print quality does not meet the predetermined quality standards, the print quality monitoring device is further configured to instruct the printing mechanism to print the prescribed corrective action on the print media.
In some embodiments, the machine-readable indicia comprises a printed barcode, and analyzing the print quality of the machine-readable indicia further comprises comparing one or more barcode quality parameters of the printed barcode and a barcode print quality standard.
In some embodiments, the one or more barcode quality parameters comprise a modulation parameter, and identifying the print quality problem further comprises identifying a modulation problem in the printed barcode in at least one of a picket fence orientation and a ladder orientation. In some embodiments, determining that the print quality of the machine-readable indicia does not meet the predetermined quality standards further comprises determining a modulation grade of the printed barcode fails to meet an acceptable modulation grade according to a printing application requirement.
In accordance with various embodiments, a method for providing print quality feedback and controlling print quality is provided. The method comprises: printing, by a printer-verifier apparatus, a machine-readable indicia on a print media; scanning, by the printer-verifier apparatus, the machine-readable indicia on the print media; analyzing, by the printer-verifier apparatus, the print quality of the machine-readable indicia on the print media; determining, by the printer-verifier apparatus, that the print quality of the machine-readable indicia does not meet predetermined quality standards; and in response to determining that the print quality does not meet the predetermined quality standards, printing, by the printer-verifier apparatus, diagnostic information on the print media.
In accordance with various embodiments, a printer verification device comprises a sensing device configured to optically sense an image printed onto print media within a printer. The printer verification device further comprises a quality analyzing device configured to analyze the print quality of the image printed onto the print media. A printer control device is configured to instruct a printing mechanism to print diagnostic information onto the print media when the quality analyzing device determines that the print quality does not meet predetermined quality standards.
In accordance with various embodiments, a printer is provided. The printer in this embodiment includes a printing mechanism configured to print images onto print media and a print verification device configured to monitor the print quality of the images printed onto the print media. The print verification device is configured to analyze the print quality to determine if the print quality meets predetermined quality standards. When the print verification device determines that the print quality does not meet the predetermined quality standards, the print verification device instructs the printing mechanism to print diagnostic information onto the print media.
In accordance with various embodiments, a method associated with a printer is provided. The method includes a first step of analyzing the print quality of a barcode printed by a printing mechanism onto a label. Another step includes determining if the print quality meets predetermined quality standards. The method also includes instructing the printing mechanism to print diagnostic information onto the label if the print quality does not meet the predetermined quality standards.
In accordance with various embodiments, a method is provided for controlling a print quality of a machine-readable indicium from a printer. An image of the machine-readable indicium is captured. The print quality of the machine-readable indicium from the captured image is evaluated. A print quality problem as a result of the evaluating step is identified. A prescribed corrective action to resolve the print quality problem is determined by retrieving association data that associates different print quality problems with a respective prescribed corrective action. The prescribed corrective action is caused to be implemented such that a next machine-readable indicium does not have the print quality problem. Data is generated from controlling the print quality of the machine-readable indicium. The association data is updated with the data and/or the data is collected and stored for use in printing process control.
In some embodiments, the method further comprises repeating the capturing and evaluating steps for each machine-readable indicium. In some embodiments, the method further comprises generating at least one diagnostics report.
In some embodiments, causing implementation of the prescribed corrective action comprises adjustment of a printhead temperature and a speed of the printer when the modulation problem of the printed barcode is in both the picket fence orientation and the ladder orientation; implementing an adjustment in printhead temperature when the modulation problem of the printed barcode is in the picket fence orientation only; and implementing an adjustment in print speed when the modulation problem is in the ladder orientation only.
In some embodiments, one of the barcode quality parameters comprises a defects parameter. Identifying the print quality problem comprises identifying defects in the printed barcode, and causing implementation of the prescribed corrective action comprises communication to a user of the printer to change print media for a next printed barcode.
In some embodiments, the machine-readable indicium comprises a printed OCR-B character and evaluating the print quality comprises: applying a binarization algorithm to the printed OCR-B character and comparing the printed OCR-B character after application of the binarization algorithm to a print quality standard.
In some embodiments, identifying a print quality problem comprises identifying the print quality problem in the printed OCR-B character by non-conformity of the printed OCR-B character with a Stroke Width Template described in ISO/IEC standard 30116.
In some embodiments, causing implementation of the prescribed corrective action comprises implementing an adjustment in at least one of print speed and printhead temperature if the printed OCR-B character does not conform with the Stroke Width Template by exceeding or being short of an outer character boundary of the Stroke Width Template and by communication to a user of the printer to change print media for next printed OCR-B character if the printed OCR-B character does not conform with the Stroke Width Template by having defects therein.
In some embodiments, the captured machine-readable indicium comprises a first captured image. The method further comprises: capturing the image of the next machine-readable indicium from same printer to obtain a second captured image; evaluating the print quality of the next machine-readable indicium from the second captured image; and verifying, after the prescribed corrective action has been implemented, that the next machine-readable indicium does not have the print quality problem, thereby determining that the prescribed corrective action resolved the print quality problem.
In accordance with various embodiments, a method is provided for controlling print quality of a printed barcode from a printer, according to various embodiments of the present invention. An image of the printed barcode from a printer is captured to obtain a captured image. The printed barcode is formatted in a picket fence orientation and in a ladder orientation. A print quality of the printed barcode is evaluated. A modulation problem in both the picket fence orientation and the ladder orientation of the printed barcode is identified as a result of the evaluating step. A prescribed corrective action is determined for improving a modulation grade of the printed barcode. Adjustment of the printer is caused to implement the prescribed corrective action to improve the modulation grade of a next printed barcode.
In some embodiments, causing adjustment of the printer to implement the prescribed corrective action comprises adjusting a printhead temperature for the next printed barcode in the picket fence orientation and adjusting a print speed of the printer for the next printed barcode in the ladder orientation.
In accordance with various embodiments, a method is provided for controlling print quality of a printed barcode from a printer, according to various embodiments of the present invention. An image of the printed barcode from a printer is captured (a captured image). A print quality of the printed barcode from the captured image is evaluated. A defect in the printed barcode is identified as a result of the evaluating step. A prescribed corrective action for decreasing defects in a next printed barcode is determined. The prescribed corrective action is communicated to a user of the printer.
In some embodiments, the printed barcode comprises one of: on same print media, a first one-dimensional printed barcode in the picket fence orientation and a second one-dimensional printed barcode in the ladder orientation, the modulation problem identified in both the first one-dimensional printed barcode and the second one-dimensional printed barcode; or a two-dimensional barcode.
In accordance with various embodiments, a method is provided for controlling print quality of a printed OCR-B character from a printer, according to various embodiments of the present invention. An image of the printed OCR-B character from a printer is captured to obtain a captured image. A print quality of the printed OCR-B character is evaluated by applying a binarization algorithm to the printed OCR-B character and comparing the printed OCR-B character after the binarization algorithm has been applied to a print quality standard. A print quality problem in the printed OCR-B character is identified as a result of the evaluating step. A prescribed corrective action is determined for improving a grade of the printed OCR-B character. Adjustment of the printer is implemented based on the prescribed corrective action to improve the grade of a next printed OCR-B character.
In some embodiments, evaluating the print quality comprises analyzing one or more barcode quality parameters of the printed barcode from the captured image and comparing the results against a barcode print quality standard, wherein one of the barcode quality parameters comprises a defects parameter; identifying the defect in the printed barcode comprises identifying that defects grade of the printed barcode fails to meet an acceptable defects grade according to a printing application requirement; and determining the prescribed corrective action comprises retrieving association data that specifically associates a failure to meet the acceptable defects grade with the prescribed corrective action.
In some embodiments, communicating the prescribed corrective action to the user of the printer comprises communicating that the prescribed corrective action comprises at least one of changing print media and cleaning a printhead.
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 in the following detailed description and its accompanying drawings.
The description of the illustrative embodiments may be read in conjunction with the accompanying figures. It will be appreciated that for simplicity and clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements are exaggerated relative to other elements. Embodiments incorporating teachings of the present disclosure are shown and described with respect to the figures presented herein, in which:
Some embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the disclosure are shown. Indeed, these disclosures may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Like numbers refer to like elements throughout.
The phrases “in one embodiment,” “according to one embodiment,” and the like generally mean that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure, and may be included in more than one embodiment of the present disclosure (importantly, such phrases do not necessarily refer to the same embodiment).
The word “example” or “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations.
If the specification states a component or feature “may,” “can,” “could,” “should,” “would,” “preferably,” “possibly,” “typically,” “optionally,” “for example,” “often,” or “might” (or other such language) be included or have a characteristic, that a specific component or feature is not required to be included or to have the characteristic. Such component or feature may be optionally included in some embodiments, or it may be excluded.
Various embodiments of the present invention will be described in relation to a thermal transfer printer. However, the present invention may be equally applicable to other types and styles of printers (inclusive of printer-verifiers) (e.g., a thermal direct printer, a laser toner printer, an ink drop printer, etc.).
As used herein, the term “printer” refers to a device that prints barcodes, OCR-characters, text, illustrations, etc. onto print media (e.g., labels, tickets, plain paper, synthetic paper, receipt paper, plastic transparencies, and the like). Unless otherwise indicated, the term “printer” encompasses printers with or without an integrated verifier. The print media may be continuous or non-continuous.
As used herein, the terms “machine-readable indicia,” “machine-readable indicium,” “barcode” and “OCR-B character” refer to an optical representation of data (e.g., data is encoded into the barcode and OCR-B character) that may be scanned (i.e., machine read) by a machine-reader. There are many types of barcodes and OCR-B characters for many applications. Barcodes may be one-dimensional barcodes (e.g., Universal Product Code, U.P.C.) having dark lines (i.e., bars) and light lines (i.e., spaces) of various widths arranged along a scan axis. Barcodes may be two-dimensional matrix symbols (e.g., Aztec Code, Data Matrix, QR Code), PDF417, etc.) (herein a “two-dimensional barcode”) having a two-dimensional array of light features, dark features, and (in some cases) alignment features. The light and dark features may include “modules”, i.e., the printed (or unprinted) squares in a two-dimensional matrix symbol. An exemplary two-dimensional barcode (e.g., QR Code) is partially depicted in
Barcodes and OCR-B characters are printed on the print media. Once printed on a print media, the barcode is referred to herein as a “printed barcode.” Similarly, the OCR-B character is referred to herein as a “printed OCR-B character” once printed on a print media. The print media on which the machine-readable indicium is printed may also be referred to herein as a “printed medium.” The printed medium may be affixed to an item. For example, the encoded data of the printed barcode may relate to the item(s) on which the printed medium is affixed. The terms “barcode” and “symbol” may be used interchangeably herein.
The tolerance of the machine-readable indicia is closely related to the machine reader's ability to read the printed indicium (e.g., a printed barcode) in a single scan, and to correctly interpret the encoded data. Additionally, a “machine-readable indicium” or “machine-readable indicia” (such as a OCR-B character) may suffer from a print quality problem such that it is not actually machine readable.
Embodiments of the present invention may be implemented as apparatus and systems for providing print quality feedback and controlling print quality of machine-readable indicia.
A. Print Media and Machine Readable Indicia
Referring to
The quality of the printed barcodes 104a and 104b depends in part on the orientation of the printed barcodes 104a and 104b on the print media 102 (e.g., the label orientation) and the printing direction of the printed barcodes 104a and 104b.
When the bars of a one-dimensional linear barcode (e.g. the barcode 104a) are parallel to the movement of the print media stock through the printer, this is referred to as printing the barcode 104a as a “picket fence.” As illustrated in
Further, as shown in
Referring to
B. Printer and Printer-Verifier
Referring now to
Referring now to
As shown in
Referring back to
Referring now to
The imaging module 410 may further comprise an image sensor 403. The image sensor 403 uses an imaging lens (or lenses) to form a real image of the field of view 406 on an array of photo sensors (e.g., a linear or 2D array CCD, CMOS sensor, CIS, etc.). Electronic signals from the photo sensors are used to create gray level or color images, e.g., which would result in a digital image that may be obtained by a digital camera. The image sensor 403 is configured to capture an optical image of the machine-readable indicium (such as the printed barcode 404) within the field of view 406. The printed barcode 404 is printed on a print media 408.
As shown in
While
Referring now to
The imaging module 502 is further in electronic communication with the processor 506, the graphical user interface (GUI) 510, the memory 508, and the communication module 512. The GUI 510 may display visual and/or auditory information and receiving information from the user. The printer-verifier 501 may be communicatively connected to a computer or a network 518 via a wired or wireless data link using the communication module 512.
As shown by comparing
In accordance with various embodiments of the present invention, the printer-verifier 501 depicted in
In accordance with various embodiments of the present invention, when the verifier is attached to the printer, the verifier may rely on the memory and the processor of printer for executing the steps as hereinafter described. In embodiments where the verifier is a standalone device, the verifier has its own verifier memory and processor for executing the steps as hereinafter described.
Additionally, or alternatively, the printer may rely on the memory and processor of verifier attached to the printer for executing the steps as hereinafter described. Therefore, the processor in at least one of the printer and the verifier (or in the printer-verifier) is configured by the computer program to execute the steps as hereinafter described.
Referring now to
The printer/printer-verifier 600 (for example, a thermal transfer printer/thermal transfer printer-verifier) may comprise a ribbon supply spindle 604 contained within the body 602. A ribbon supply roll 606 is configured to be disposed on the ribbon supply spindle 604. The ribbon supply roll 606 comprises ink ribbon 608 on a ribbon supply spool 610. The ink ribbon supplies the media (e.g., ink) that transfers onto the print media.
The printer/printer-verifier 600 may further comprise a thermal printhead 613 utilized to thermally transfer a portion of ink from the ink ribbon 608 to the print media 601 as the ink ribbon is unwound from the ribbon supply spool 610 along a ribbon path (arrow B in
The media supply roll 616 comprises the print media 601 on the media supply spool 618. A media supply spindle 614 on which the media supply roll 616 is configured to be disposed is contained within the body 602. A ribbon rewind spindle 620 on which unwound ribbon is wound up may also be contained within the body 602. A ribbon take-up 622 may be disposed on the ribbon rewind spindle 620, although the ribbon take-up 622 on the ribbon rewind spindle 620 may not be necessary.
The printer/printer-verifier 600 may further comprise one or more motors for rotating the ribbon supply spindle 604 and the ribbon roll disposed thereon (if present) in a forward (arrow A in
The printer/printer-verifier 600 may further comprise a graphical user interface (GUI) 623 for displaying visual and/or auditory information and receiving information from the user (e.g., typed, touched, spoken, etc.). The body 602 of the printer/printer-verifier 600 may include the graphical user interface 623 with, for example, a display 624 and a keypad 626 with function buttons 630.
Further, similar to those embodiments described above in connection with
Embodiments of the present invention may be implemented as methods for providing print quality feedback and controlling print quality of machine-readable indicia.
It will be understood that each block of the flowchart, and combinations of blocks in the flowchart, may be implemented by various means, such as hardware, firmware, one or more processors, circuitry and/or other devices associated with execution of software including one or more computer program instructions. For example, one or more of the procedures described herein may be embodied by computer program instructions. In this regard, the computer program instructions which embody the described procedures may be stored by the verifier memory of a printing and verifying system employing an embodiment of the present disclosure and executed by a processor in the printing and verifying system.
As will be appreciated, any such computer program instructions may be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus provides for implementation of the functions specified in the flowcharts' block(s). These computer program instructions may also be stored in a non-transitory computer-readable storage memory that may direct a computer or other programmable apparatus to function in a specific manner, such that the instructions stored in the computer-readable storage memory produce an article of manufacture, the execution of which implements the function specified in the flowcharts' block(s). The computer program instructions may also be loaded onto a computer or other programmable apparatus to cause a series of operations to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide operations for implementing the functions specified in the flowcharts' block(s). As such, the operations of
Accordingly, blocks of the flowchart support combinations of means for performing the specified functions and combinations of operations for performing the specified functions. It will also be understood that one or more blocks of the flowchart, and combinations of blocks in the flowchart, can be implemented by special purpose hardware-based computer systems which perform the specified functions, or combinations of special purpose hardware and computer instructions.
A. Controlling Print Quality
A verifier may determine, in a verification process, whether the machine-readable indicia meets print quality standards. The verifier automates the verification process by capturing an image of the machine-readable indicia (or indicium), and evaluating the machine-readable indicium in the captured image according to a print quality standard. If the machine-readable indicium fails to meet the print quality standard, the rejected printed medium may be retracted back into the printer and branded with the word “void”, after which a next machine-readable indicium is printed by the printer.
The user may adjust the printer in an effort to correct the print quality problem for the next machine-readable indicium, but the correction may or may not be successful, in addition to taking time. The end result is that more than one unusable printed medium may be printed. In addition, the verifier may be attached to the printer or used as a standalone device to where the user brings the machine-readable indicium and indicia for verification. In the case of a standalone device, branding the word “void” may not occur.
Therefore, a need exists for methods for controlling print quality of machine-readable indicia including printed barcodes and OCR-B characters. A further need exists for increasing a modulation grade and/or a defects grade of succeeding printed barcodes, including a next printed barcode. An additional need exists for increasing a grade of succeeding printed OCR-B characters, including a next printed OCR-B character. A still further need exists for methods for controlling print quality of machine-readable indicia to automatically adjust the quality of succeeding machine-readable indicia and generate data for long-term printing process control.
Various embodiments of the present invention embrace methods for controlling print quality of machine-readable indicia such as printed barcodes and printed OCR-B characters. Various embodiments may be particularly useful for substantially correcting poor modulation (i.e., improving a modulation grade) in a next printed barcode in at least one of a picket fence orientation and a ladder orientation, and substantially correcting printing defects (i.e., improving a defects grade) in the next printed barcode, and plotting/analyzing the captured data for long-term printing process control. Improving a modulation grade and/or a defects grade respectively comprises “substantially correcting” the modulation problem and defects problem. Various embodiments are useful for improving a grade of a next printed OCR-B character, and enable automatic diagnosis of the print quality problem and automatic adjustments as a corrective action in response to identification of the print quality problem.
Referring now to
The method 700 begins by capturing an image of the machine-readable indicium (at step 702). As noted above, the image is captured by an imaging module (for example, imaging module 302) of a verifier (either a separate verifier or a printer-verifier). The machine-readable indicium may be a printed barcode or a printed OCR-B character.
For example, the printed barcode may be a one-dimensional barcode (e.g.,
Referring now to
Referring back to
The step of evaluating the print quality of the machine readable indicium from the captured image, in the case of a printed barcode, comprises analyzing one or more barcode quality parameters of the printed barcode from the captured image (more particularly, a quality level achieved for each assessed parameter), and comparing the results against a barcode print quality standard such as a barcode print quality standard set forth in the ISO/IEC 15415, 29158, or 15416 barcode print quality test specifications.
The parameters of barcode quality affect the quality of the printed barcode and are based on the optics of bar code scanning systems. Barcode print quality parameters may include, among other parameters, a modulation parameter and a defects parameter. Each quality parameter will indicate Pass, Fail, or a grade. Both the modulation parameter and the defects parameter may be graded. In this regard, various embodiments of the present invention improve a modulation/defects grade of a printed barcode to “substantially correct” an identified modulation problem.
In addition to evaluating barcode print quality for meeting a print quality standard based on, for example, ANSI/CEN/ISO guidelines, the evaluation of barcode quality includes matching a printing application requirement such as a customer specification. Depend on the printing application requirement, higher or lower modulation grades and/or defects grades may be required.
The step of evaluating the print quality of the machine-readable indicium from the captured image, in the case of a printed OCR-B character (such as the exemplary printed OCR-B character 802a of
Various embodiments of the present invention are directed to improving the grade of the printed OCR-B character to “substantially correct” an identified print quality problem as hereinafter described. The exemplary printed OCR-B character 802a of
Referring back to
If there is print quality problem identified at step 705, the method 700 may identify the particular print quality problem in step 706. In accordance with some embodiments of the present invention, as used herein, “identifying a print quality problem” in step 706 may incorporate the step of detecting a print quality problem in step 705.
In various embodiments, identifying a print quality problem may comprise identifying a modulation problem in the printed barcode having at least one of a picket fence orientation and a ladder orientation. The modulation problem is identified when a modulation grade of the printed barcode fails to meet an acceptable modulation grade according to the printing application requirement. In various embodiments, a printed barcode in the picket fence orientation, the ladder orientation, or in both the picket fence orientation and the ladder orientation may have a modulation problem. As noted above, the printed barcode in both the picket fence orientation and the ladder orientation may comprise, on the same print media, a first one-dimensional printed barcode in the picket fence orientation (printed barcode 104a in
Modulation is based on the relationship between the minimum edge contrast and the symbol (barcode) contrast (ECmin/SC, wherein ECmin=Edge Contrast Minimum and SC=Symbol Contrast). The greater the difference between minimum edge contrast and symbol contrast, the lower the modulation grade. Stated another way, modulation is related to how a machine-reader “sees” different elements (bars or spaces in a one-dimensional barcode) relative to one another as well as the light and dark features (e.g., the modules) of two-dimensional barcodes as represented by reflectance values. For the same element, readers usually “see” spaces narrower than bars, and they also see narrow elements as being less distinct than wide ones. A scan reflectance profile typically shows narrow spaces being less intense or not as reflective as wide spaces, and narrow bars as being less dark than wide bars.
In accordance with various embodiments, identifying a print quality problem may comprise identifying a defect in the printed barcode. Defects are irregularities in bars, spaces and quiet zones of one-dimensional barcodes and irregularities in the light and dark features of two-dimensional barcodes (e.g., a “spot” in a space or a “void” in a bar). Defects are measured based upon the relationship between the largest defect in the symbol (printed barcode) and the symbol contrast (ERNmax/SC, wherein ERNmax=Element Reflectance Non-uniformity and SC=Symbol Contrast). The smaller the defect, the better the defect grade.
Referring now to
For example,
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Still referring to
For example, a modulation problem in the printed barcode having both a picket fence orientation and a ladder orientation may be associated with the prescribed corrective action of adjusting the printhead temperature and adjusting the speed of the printer. A modulation problem in the printed barcode having a picket fence orientation may be associated with the prescribed corrective action of adjusting the printhead temperature. A modulation problem in the printed barcode having a ladder orientation may be associated with the prescribed corrective action of adjusting the print speed. A defects problem may be associated with a prescribed corrective action of changing the print media (e.g., to a higher quality print media) for the next printed barcode.
The prescribed corrective action associated with the modulation problem improves the modulation grade of the next printed barcode. The prescribed corrective action associated with the defect problem improves the defect grade.
As used herein, improvement in the modulation grade and/or defects grade comprises “substantial correction” of the print quality problem. A print quality problem in the printed OCR-B character (such as depicted in
Referring back to
For example, if a modulation problem in the printed barcode in both a picket fence orientation and in a ladder orientation is identified in step 706, the processor in the printer, the verifier, or both, or the processor in the printer-verifier causes automatic adjustment of the printhead temperature and the speed of the printer. If a modulation problem is identified in the printed barcode in the picket fence orientation only, the processor in the printer, the verifier, or both, or the processor in the printer/printer-verifier 600 causes automatic adjustment of the printhead temperature. The printhead temperature may be either reduced or increased, depending upon the specifics of the modulation problem identified. If poor modulation results from bars that are too light, i.e., high up in the Scan Reflectance profile (as defined, for example, in 15416 barcode print quality test specification), then an increase in printhead temperature is implemented. If the bars are too dark, i.e., near the bottom of a Scan Reflectance Profile, a reduction of printhead temperature is implemented. If the identified modulation problem is in a ladder orientation only, the processor in the printer, the verifier, or both, or the processor in the printer-verifier causes automatic adjustment in print speed. The print speed may either be reduced or increased. If the identifying step results in identifying a defect problem in the printed barcode, causing implementation of the prescribed corrective action comprises communicating to a user of the printer to change the print media (e.g., to a higher quality print media) for the next printed barcode.
If the identifying step 706 results in identifying a print quality problem in the OCR-B character, the prescribed corrective action that is caused to be implemented depends upon the specific non-conformity of the printed OCR-B character. For example, as noted above, the prescribed corrective action when the printed OCR-B character that exceeds (or is short of) the outer character boundary of the Stroke Width Template (such as depicted in
Returning to
Still referring to
Still referring to
Still referring to
A print quality problem in the machine-readable indicium may be identified and automatically (substantially) corrected (at least for modulation problems and some print quality problems in printed OCR-B characters) ideally before a next machine-readable indicium is printed or shortly thereafter, thereby substantially preventing the generation of multiple unusable printed medium. The print quality of each machine-readable indicium may be evaluated immediately after an image thereof has been captured, with the prescribed corrective action automatically implemented as soon as the machine-readable indicium is identified as having the print quality problem. As a result, there is a continual adjustment to achieve optimal print quality in each machine-readable indicium, with the identified print quality problem substantially corrected in succeeding machine-readable indicia including the next printed machine-readable indicium.
From the foregoing, it is to be understood that various embodiments of the present invention control the print quality of machine-readable indicia such as printed barcodes and printed OCR-B characters. Various embodiments enable automatic implementation of the prescribed corrective action for the print quality problem as soon as the print quality problem is identified in the machine-readable indicium. As a result, the print quality problem is substantially corrected in succeeding machine-readable indicia from the same printer.
B. Providing Print Quality Feedback
Although many printing applications do not necessarily require a high quality of printing, there are some applications in which the print quality is particularly important. For example, when printing barcodes, the print quality of barcodes must meet standards ISO/IEC 15415 and ISO/IEC 15416, among others. Even when verifying the quality of barcodes, barcode verifiers must meet standards ISO/IEC 15426-1 and ISO/IEC 15426-2, among others.
To determine print quality, verifiers may use a gray-level print quality analysis (often called “ANSI grading”). When an error is detected, verifiers may provide a simple message to communicate that an error has been detected. For example, the verifiers may simply print “VOID” on the barcode or display an error message on a display screen of the printer or printer verifier.
There is a need for systems and methods to provide more information. By communicating more information to a user, the user can more easily maintain the printers and printer verifiers to keep the devices operating properly. In accordance with various embodiments, the present invention provides systems and methods of improving the process of verifying print quality. In addition to the indication of “failure” or “success,” the present invention further provides a great amount of information when the verification test results in a failure. In other words, the present invention provides more feedback than just a ‘VOID’ message as there may be many different levels of quality that could generate a failure. In addition to the notice that the label fails, the present invention prints useful information about what to do about the failure.
Not only do the verifiers of the present disclosure determine print quality, the verifiers are also further configured to print information onto the print media or label when the print quality does not meet an acceptable threshold. Printing the information communicates the reasons why the print quality is not acceptable, and can also provide information on how a user can correct or improve the print quality. Otherwise, with only a simple notification that the printer has failed a verification test, the user may not know how to correct the issues that caused the failure, and the printer may continue to print out defective products. The present invention provides detailed information that can be printed directly onto the labels so that the user can have a record of the error and instructions about how to fix the error.
Similar to the embodiments described above in connection with
The verifier associated with the label printer 900 may be configured to analyze the print quality of images printed onto the labels. The verifier may further compare the analyzed print quality with certain quality standards, such as ISO/IEC 15415, ISO/IEC 15416, ISO/IEC 15426-1, ISO/IEC 15426-2, ANSI X3.182, among others. If the print quality does not meet the standards or contains parameters that fall below a minimum acceptable threshold, then the verifier can print diagnostic information onto the label.
For example, the diagnostic information may include gray levels, ANSI grade levels, numeric ANSI grades, and/or bar width growth percentages. The diagnostic information may also include instructions defining an appropriate course of action that a user may take for correcting any issues. The corrective actions may include, for example, changing the pressure of a printhead of a printing mechanism. The printhead pressure is the pressure applied by the printhead to the print media that is supported by a platen roller or other printing surface. Other corrective actions may include reducing the temperature of the printhead, cleaning the printhead, repairing the printhead, replacing the printhead, realigning the print media within the printer, realigning a printer ribbon within the printer, and/or other actions.
Some verifiers may determine information regarding the ANSI grades (for example, by evaluating the gray-level image to a standard such as ISO/IEC 15415 and 15416). That information may be stored in a digital file for later retrieval or displayed temporarily on a computer screen. With the configuration of
In the present invention, detailed print quality information and/or diagnostic information can be printed directly on a failed label. Examples of useful information that can be printed on the label may include (1) an ANSI grading level (e.g., “A”-“F”), (2) a numeric ANSI grade level (e.g., from 0.0 to 4.0), and (3) bar width growth (e.g., +5.9%).
In accordance with various embodiments, the present invention may further provide information to the user as to what to do about a failed label. For instance, in high-impact printing installations (such as pharmaceutical labeling), it may be necessary to stop all printing on a specific label printer if a failed label is detected. In this case, the printing and verifying apparatus 1000 may print a message on the label such as “Stop the Printer and Notify your Supervisor.”
In another embodiment, process-specific information is provided. For example, if a parameter of a label exceeds a given threshold (e.g., bar width growth >10%), the printing and verifying apparatus 1000 can print a message to instruct the user to adjust the printer. For instance, a message printed on the failed label may read “Reduce Printhead Temperature Slightly.” Similarly, if the reason for failure is in the Defects Grade, the message printed on the label may be “Stop Printing and Clean Printhead.”
In another embodiment, the printing and verifying apparatus 1000 may detect burned-out dots in the printhead of the printing mechanism 1002 based on the analysis of the print quality. Burned-out dots may be detected by comparing sequential scan grades of a linear bar code symbol or by other methods. If printhead dot failure is detected, the print verification device 1004 may use a certain threshold, which could be a predetermined threshold or set by the user for a particular use. For example, the burned-out dot threshold could be as low as one defective dot or may be as high as a maximum number that still allows acceptable results. Therefore, if the printhead exceeds the threshold, the printhead would be considered defective and in need of repair or replacement. The burned-out dot threshold may alternatively include a maximum number of adjacent defective dots, such as two or three adjacent defective dots. If one of these thresholds is exceeded, the printing mechanism 1002 may print a message such as “Printer Maintenance Required” or “Replace the Printhead” depending on the environment and/or the level of operator competency.
As described above, when the user is presented with useful barcode quality information from the integrated printing and verifying apparatus 1000, the user can better understand the printing issues so that he can act on the knowledge of barcode print quality. Receiving appropriate feedback enables the user to more easily analyze why the printer is producing unacceptable labels. In some embodiments, the feedback may include instructions regarding the appropriate course of corrective action by communicating with the user by instructions that can be printed directly on the failed label.
Therefore, according to some embodiments, a printer (e.g., the label printer 900) may comprise the printing mechanism 1002 configured to print images onto print media 1001. The printer may further comprise a print verification device 1004 configured to monitor the print quality of images printed onto the print media. The print verification device 1004 may be configured to analyze the print quality to determine if the print quality meets predetermined quality standards. When the print verification device 1004 determines that the print quality does not meet the predetermined quality standards, the print verification device 1004 may instruct the printing mechanism 1002 to print diagnostic information onto the print media.
In response to receiving the instruction to print the diagnostic information, the printing mechanism 1002 may be configured to print the diagnostic information onto the print media 1001. For example, the printing mechanism 1002 may print the diagnostic information on the same label that is determined to be defective. Printing on the same label may include printing an image over the printed barcode information. In other embodiments, when the defect is detected after the label has passed through the printing mechanism 1002, the printing mechanism 1002 may print the diagnostic information on the next label after the defective one. Some embodiments may also include a process of retracting the defective label by reversing the rotation of the platen roller 1010 and printing the diagnostic information on top of the printed images of the defective label.
As mentioned above, the diagnostic information may include information regarding a level of print quality. The diagnostic information may include gray levels, ANSI grade levels, numeric ANSI grades, and/or a bar width growth percentage. The print verification device 1004 may be configured to utilize the diagnostic information for comparison purposes to detect errors in the print quality.
As mentioned above, the diagnostic information may include maintenance instructions defining at least one user action to improve or correct the print quality. For example, the at least one user action may include changing the pressure that a printhead of the printing mechanism 1002 applies to a print media that is supported by a platen roller or other printing surface, reducing the temperature of the printhead when the bar width growth is greater than a predetermined percentage, cleaning the printhead when a defects grade failure is determined, repairing or replacing the printhead when a dot failure exceeds a predetermined threshold, realigning the print media 102 within the printer, and/or realigning the ink ribbon 1006 within the printer.
As mentioned above, the print media 1101 may include at least one blank label on which images are printed. The printed images may include at least one barcode. When the print verification device 1004 determines that the print quality does not meet the predetermined quality standards, the printing mechanism 1002 may be configured to print the diagnostic information over the at least one barcode. In some embodiments, the diagnostic and/or quality grading information may be printed on the media as a bar code symbol or other type of symbology.
The printing and verifying device 1100 is configured such that the printing mechanism 1102 and the verifier 1104 comprising a contact image sensor (CIS) device are positioned adjacent to or near each other. In this way, the sensing or scanning of the print quality can take place immediately after the printing mechanism 1102 prints images onto the labels. The CIS device senses or scans images of the labels and forwards sensor signals to the print quality monitoring device 1106, which acts as a control device. The print quality monitoring device 1106 processes the sensor signals to determine print quality and provides feedback to the printing mechanism 1102.
In operation, print media 1101 is fed through the printer in the direction of arrow 1112, as shown in
The print quality monitoring device 1106 may be configured to monitor a variety of possible issues. For example, the print quality monitoring device 1106 may detect ribbon wrinkle, stained print media, damaged print media, defective print media, printing lapses, and/or barcode width variations. After analysis, the print quality monitoring device 1106 may provide signals to the printing mechanism 1102 to control the printing mechanism 1102 to print diagnostic information onto the labels 1114.
In some embodiments, the print media 1101 may include an embedded radio frequency identification (RFID) tag on each label 1114. The printing and verifying device 1100 may be configured with an RFID writing device configured to write or encode the diagnostic and/or quality information into the embedded RFID tags. For example, the RFID writing device may be incorporated in the printing mechanism 1102 or may be a separate component positioned elsewhere in the housing 1108.
The sensing device 1202 is configured to sense or scan images printed on a label and/or obtain sensed image signals. The image information is transmitted to the quality analyzing device 1204, which is configured to analyze the print quality of the images. The analysis conducted by the quality analyzing device 1204 may include comparing the characteristics of the printed images with certain quality standards or thresholds. Also, the quality analyzing device 1204 may determine whether the printed image meets the standards and/or are acceptable based on comparisons with quality threshold levels.
In some embodiments, the printer verification device 1200 may comprise the sensing device 1202 within a printer to optically sense or scan an image printed onto print media 102. The quality analyzing device 1204 may be configured to analyze the print quality of the image printed onto the print media. The printer control device 1206 may be configured to instruct a printing mechanism (e.g., printing mechanism 1002, 1102) to print diagnostic information onto the print media when the quality analyzing device 1204 determines that the print quality does not meet predetermined quality standards.
As mentioned above, the diagnostic information provided by the printer verification device 1200 may include any suitable information that can be helpful for maintenance or repair purposes. For example, the diagnostic information may include gray levels, ANSI grade levels, numeric ANSI grades, bar width growth amounts, and/or other parameters. The quality analyzing device 1204 may be configured to utilize the diagnostic information to detect errors in the print quality. The diagnostic information provided by the printer control device 1206 may include instructions defining an appropriate course of corrective actions. The corrective action performed by a user or maintenance worker may include changing the pressure that a printhead of the printing mechanism 1102 applies to a print media, reducing the temperature of the printhead, cleaning the printhead, repairing the printhead, replacing the printhead, realigning the print media 102 within the printer, and/or realigning a printer ribbon within the printer.
The print media may include at least one label and the image printed on the label may include at least one barcode. The printer verification device may be further configured such that the quality analyzing device 1204 determines if the print quality meets the predetermined quality standards. The printer control device 1206 instructs the printing mechanism (e.g., printing mechanism 1002, 1102) to print the diagnostic information over the image printed onto print media (e.g., print media 1001, 1101) when the print quality does not meet the quality standards.
In
A verifying device may be positioned such that it can verify the barcodes 1302 immediately after the barcodes 1302 are printed and before the rest of the label 1300 is printed. Similarly, the print quality monitoring device 1106 or quality analyzing device 1204 can determine if the barcodes 1302 meet the quality standards. The print quality can therefore be analyzed before the rest of the label 1300 is fed through the printer or during a pause in the feeding process if extra time is needed to analyze the quality. If it is determined that the quality does not meet the standards, then the print quality monitoring device 1106 or printer control device 1206 can change the image buffer of the printer on the fly so that the label 1300 is printed with an error message 1308 in place of the user information 1304.
The next lines of the error message 1308 may include details, such as the barcode type, an ANSI grading, a bar width growth, or other diagnostic information, details, properties, and/or measurements for communicating the issues to the user who may view the defective barcode label 1300. The error message 1308 may be incorporated in a text box. The error message 1308 and/or text box may include a certain level of visibility to show that the regular barcode label 1300 is defective.
The additional information printed in the text box of the error message 1308 can communicate the reason for the print failure. This feedback may be provided by an integrated verifier within a printer. When one of the parameters of the barcode does not meet acceptable thresholds, the printer verification device 1200 can decide whether a barcode label 1300 has failed, and determine whether to print the text box 1308. In this example, a minimum acceptable threshold value for the bar width growth may be 10%, and, as shown in
The text box 1308 may include any acceptable form, text font, text size, box design, etc. In some embodiments, the text box 1308 may be a white box with a black outline (having any thickness or design) and the diagnostic information may include black text, as shown in
According to embodiments shown in
According to another embodiment, the printer may print the entire label 1300 but leave the blank area 1306 as shown in
Alternatively, instead of retracting the label back into the printer, a second printing mechanism can be used for printing the error message 1308 and/or user information 1304. Thus, the image buffer would not be changed on the fly for each specific label, as is done in the embodiments described above. The second printing mechanism may also be configured to print the user information 1304 if no errors are detected, or it may include portions of the user information 1304 outside the text box 1308 if errors are detected.
If an error is detected, the label 1400 can be retracted back into the printer so that the error message 1406 (as shown in
As shown in
As indicated in decision block 1506, the method 1500 includes determining whether the barcode meets the quality standards, as described above. If not, then the method 1500 proceeds to block 1508, which indicates that the method 1500 further includes instructing a printer to print diagnostic information onto a label associated with the barcode. In some embodiments, the printer that prints the diagnostic information is the same printer that prints the defective barcode.
After printing the diagnostic information, the method 1500 ends. If it is determined in decision block 1506 that the barcode meets the quality standards, no further actions are required.
Therefore, according to some embodiments of the present invention, a method may be executed in association with a printer. The method may comprise the steps of analyzing the print quality of a barcode printed by a printing mechanism onto a label (e.g., block 1502), determining if the print quality meets predetermined quality standards (e.g., decision block 1506), and instructing the printing mechanism to print diagnostic information onto the label (e.g., block 1508) if the print quality does not meet the predetermined quality standards.
The diagnostic information associated with block 1508 may include information regarding a level of print quality as described above. For example, the diagnostic information may include gray levels, ANSI grade levels, numeric ANSI grades, and/or bar width growth amounts. The diagnostic information may also include maintenance instructions explaining how to improve or correct the print quality.
In some example embodiments, certain ones of the operations herein may be modified or further amplified as described. Moreover, in some embodiments additional optional operations may also be included. It should be appreciated that each of the modifications, optional additions or amplifications described herein may be included with the operations herein either alone or in combination with any others among the features described herein.
The foregoing method descriptions and the process flow diagrams are provided merely as illustrative examples and are not intended to require or imply that the steps of the various embodiments must be performed in the order presented. As will be appreciated by one of skill in the art the order of steps in the foregoing embodiments may be performed in any order. Words such as “thereafter,” “then,” “next,” etc. are not intended to limit the order of the steps; these words are simply used to guide the reader through the description of the methods. Further, any reference to claim elements in the singular, for example, using the articles “a,” “an” or “the” is not to be construed as limiting the element to the singular.
The hardware used to implement the various illustrative logics, logical blocks, modules, and circuits described in connection with the aspects disclosed herein may include a general purpose processor, a digital signal processor (DSP), a special-purpose processor such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA), a programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. Alternatively, or in addition, some steps or methods may be performed by circuitry that is specific to a given function.
In one or more example embodiments, the functions described herein may be implemented by special-purpose hardware or a combination of hardware programmed by firmware or other software. In implementations relying on firmware or other software, the functions may be performed as a result of execution of one or more instructions stored on one or more non-transitory computer-readable media and/or one or more non-transitory processor-readable media. These instructions may be embodied by one or more processor-executable software modules that reside on the one or more non-transitory computer-readable or processor-readable storage media. Non-transitory computer-readable or processor-readable storage media may in this regard comprise any storage media that may be accessed by a computer or a processor. By way of example but not limitation, such non-transitory computer-readable or processor-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), FLASH memory, disk storage, magnetic storage devices, or the like. Disk storage, as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray Disc™, or other storage devices that store data magnetically or optically with lasers. Combinations of the above types of media are also included within the scope of the terms non-transitory computer-readable and processor-readable media. Additionally, any combination of instructions stored on the one or more non-transitory processor-readable or computer-readable media may be referred to herein as a computer program product.
It is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, the steps in the method described above may not necessarily occur in the order depicted in the accompanying diagrams, and in some cases one or more of the steps depicted may occur substantially simultaneously, or additional steps may be involved. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
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.
This non-provisional application is a continuation of U.S. application Ser. No. 16/688,197, filed Nov. 19, 2019, which is a continuation of U.S. application Ser. No. 16/240,109, filed Jan. 4, 2019, now U.S. Pat. No. 10,546,160, issued Jan. 28, 2020, which claims the benefit of U.S. Provisional Patent Application No. 62/614,089, filed Jan. 5, 2018, the entire contents of which are incorporated herein by reference.
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| 20230041346 A1 | Feb 2023 | US |
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| 62614089 | Jan 2018 | US |
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| Parent | 16688197 | Nov 2019 | US |
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