USRE47928E1 - Media detection apparatus and method - Google Patents
Media detection apparatus and method Download PDFInfo
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- USRE47928E1 USRE47928E1 US15/586,455 US201215586455A USRE47928E US RE47928 E1 USRE47928 E1 US RE47928E1 US 201215586455 A US201215586455 A US 201215586455A US RE47928 E USRE47928 E US RE47928E
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- light
- print media
- media
- label
- intensity level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0095—Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
- B41J3/4075—Tape printers; Label printers
Definitions
- the present disclosure generally relates to label printers, and, more particularly, to an improved apparatus and method for automatically sensing and setting label length in a label printer.
- Labels are everywhere in our daily life and have many uses, for example, for the identification and tracking of products in the distribution chain, identification of laboratory samples, and for document and records identification. Almost every product, such as fruits, manufactured foods, electrical or mechanical equipment, books, consumer goods, etc., includes some form of label. Such labels may include graphic images, human-readable alphanumeric text, and machine-readable barcode. Many types of label media exist, and many techniques for printing labels are used. For example, thermal transfer techniques are widely used in modern industry.
- thermal label media Two kinds are commonly used.
- One is a tag stock (no adhesive) type.
- the media itself includes multiple pages attached end-to-end and wound on into a roll.
- This tag stock type uses an index mark, index notch, or an index hole to delineate labels from each other.
- This delineation feature may be used to set a starting position for printing whereby a label printer indexes the printed image from the starting position as defined, directly or indirectly, by the delineation feature of the media.
- a label type which has two layers: a backing (or liner) and a self-adhesive label attached to the backing.
- the self-adhesive labels are detached or peeled from the backing after printing, whereupon the label may be attached to the desired item.
- Each type of media may use a particular technique for separating the labels from the roll as they advance out of the printer.
- the tag stock type provides several methods. One of them is perforations on boundaries of each label or tag. The perforation method provides boundaries for each label and makes it easy for a user to cleanly tear off a label form the roll. Other methods include a manual (e.g., serrated edge) or automatic cutting mechanism (e.g., guillotine), a notch, hole, or mark for each label at a starting position for printing.
- a label printer must be manually calibrated to set a label starting position when a new supply of label media is loaded into the printer. Inaccurately setting the starting position by the user can cause printing problems such as poor registration, double feeding, and so forth, and as a result, waste labels and time. Thus, accurately setting a starting position for a label printer has substantial impact on the process of printing labels.
- the method includes operating a light-emitting unit emitting at least two light intensity levels: a first light intensity corresponding relating to the gap between labels, and a second light intensity that is greater than the first light intensity level relating to the label.
- the first and second light levels are selected such that a sufficient delta exists between the two levels to enable the detection of a transition between paper to gap, or gap to paper, as media advances through the print path.
- a light source unit is activated to emit light at the second light intensity level
- the method includes measuring an amount of the emitted light that is transmitted through the print media, advancing the print media, and setting the light source unit to emit light at the first light intensity level in response to a determination that the light transmitted through the print media is increasing decreasing.
- the method includes selecting at a first light intensity level and a second light intensity level that is greater than the first light intensity level.
- a light source unit is activated to emit light at the second light intensity level, and in some embodiments the method includes measuring an amount of the emitted light that is transmitted through the print media, advancing the print media, and setting the light source unit to emit light at the first light intensity level in response to a determination that the light transmitted through the print media is increasing decreasing.
- a position of the print media is recorded, and, in some embodiments, a position at which that the light transmitted through the print media increases or decreases is recorded.
- a measured amount of light transmitted through the print media is recorded.
- the disclosed method further includes determining whether a print media status has changed since a previous operation, determining whether an out-of-stock condition exists in response to determination that print media status has changed, signaling a fault condition in response to a determination that an out-of-stock condition exists.
- determining whether a print media status has changed since a previous operation includes comparing a current measured amount of light transmitted through the print media with a previously measured amount of light transmitted through the print media.
- determining whether an out-of-stock condition exists includes comparing a measured amount of light transmitted through the print media to a predetermined out-of-stock value.
- the setting unit is configured to select a first light intensity level and a second light intensity level greater than the first light intensity level and to cause the light source unit to emit light at the second light intensity level.
- the setting unit is configured to measure the amount of the emitted light transmitted through the print media into the light detector unit, to cause the media drive to advance the print media, and to set the light source unit to emit light at the first light intensity level in response to a determination that the light transmitted through the print media is decreasing.
- the setting unit is configured to select two intensity levels: a first “gap” light intensity level corresponding to a gap level, and a second “paper” light intensity level corresponding to paper level greater than the gap light intensity level, and to cause the light source unit to emit light at the paper light intensity level.
- a label printer in accordance with the present disclosure includes a print head in operable communication with the setting unit that is configured to imprint visible indicia upon a media label.
- the setting unit of a label printer in accordance with the present disclosure is configured to record a position of the print media.
- the position of the print media is recorded by recording a position at which that the light transmitted through the print media increases or decreases.
- the setting unit is further configured to record a measured amount of light transmitted through the print media.
- a setting unit in accordance with the present disclosure is configured to determine whether a print media status has changed since a previous operation, to determine whether an out-of-stock condition exists in response to determination that the print media status has changed, and to signal a fault condition in response to a determination that an out-of-stock condition exists.
- the determination whether a print media status has changed since a previous operation includes comparing a current measured amount of light transmitted through the print media with a previously measured amount of light transmitted through the print media.
- the determination of whether an out-of-stock condition exists includes comparing a measured amount of light transmitted through the print media to a predetermined out-of-stock value.
- a label printer in accordance with the present disclosure includes a communications interface operably coupled to the setting unit and configured to communicate via a protocol selected from the group consisting of a wired communication protocol or a wireless communication protocol.
- a label printer in accordance with the present disclosure includes a media drive having a stepper motor.
- a label printer in accordance with the present disclosure includes a setting unit, a feeding unit, a light source unit unit, and a light detecting unit.
- the setting unit sets a label starting position for the label printer when one or more conditions are met, as will be described in detail herein.
- the feeding unit feeds the media through the printer, e.g., from a supply of labels (typically a roll or fanfold supply), through a print path including a print head, and outward of the printer through an opening or slot provided in the printer housing.
- the feeding unit may include one or more drive motors configured to feed media through the printer.
- the light source unit emits light which passes through the label media, and the light detecting unit detects light transmitted through the label media.
- the detected light transitions from one range of light intensity to another range of light intensity as the media moves through the emitted light beam.
- the light source unit and the light detecting unit are aligned and placed opposite one another, and the media passes through the light beam such that the light detecting unit receives the varying levels of transmitted light detected after passing through the media.
- the light detecting unit can include a photovoltaic sensor, a photodiode, a phototransistor, or any suitable sensor that can detect light. In some embodiments, a photodiode is used for the light detecting unit, however, it is to be understood any suitable light detector unit may be employed.
- a reflective arrangement may be employed wherein the light source unit and light detector unit are positioned on the same side of the print media.
- Light source unit is configured to illuminate a region of the label media within the field of view of the light detector unit such that gap and paper light levels transitions are detected as the media advances through the field of view of the light detector unit.
- the light detecting unit is configured to detect two differing ranges of light intensity transmitted through two different portions of the print media.
- a first range is a One range of light intensity corresponds to light transmitted through the print media when the label portion of the print media is placed in positioned between the light source unit and the light detecting unit.
- a second range is a Another range of light intensity corresponds to light transmitted through the print media when the liner portion of the media (e.g., no label) or a gap, perforations, or an index hole between label portions of the media, or a gap between the label media (e.g., no layer) is placed in is positioned between the light source unit and the light detecting unit.
- the first range of light intensity detected when the label portion of the media is positioned in between the light source unit and the light detecting unit will be less than the second range if light intensity detected when the liner portion of the media (e.g., no label) or a gap, perforations, or an intex hole between label portions of the media, is positioned in between the light source unit and the light detecting unit, because the transmitted light may be partially or totally blocked by the label portion of the media.
- the second range of light intensity detected when the liner portion of the media e.g., no label
- the first range light intensity detected when the label portion of the media is positioned in between the light source unit and the light detecting unit, since the liner portion, gap, notch, or space between labels permits more light to pass therethrough.
- the described method and apparatus will attempt automatic recalibration when it is determined that a new supply of media has been loaded into the printer.
- the disclosed method can adapt to the new media regardless of whether the new supply of the same type of media as was used immediately prior, or, a different type of media has been loaded. For example, if the new media demonstrates values outside the range of those seen with respect to the previously-loaded batch of labels (e.g., is an outlier compared to the range of overall light transmissivity values of previous labels), then calibration of the detecting unit is configured to automatically adjust the two ranges of light intensity with respect to the new label media's light transmissivity.
- the light detecting unit sends a signal to the setting unit when it detects a range transition from one range to another range of light intensity of the light emitted by the light source unit and transmitted through the media, and, when the setting unit receives the signal two times, the setting unit sets the starting position of the media to be printed.
- the setting unit sets the starting position for printing, the auto-calibration process is complete and the label printer can proceed to print labels without wasting many labels for adjustment, and without user interaction.
- a flow chart which illustrates auto-calibration for the label printer.
- the light detecting unit detects the light transmitted though the label media, and transmits the value to the setting unit.
- the setting unit stores this light intensity value, which represents a transmissivity of the label media.
- the light intensity value is dependent upon the type of media in use, and the position of the media relative to the light beam.
- a motor associated with a feeding unit is stopped while the printer is waiting for a print or feed event.
- the label printer checks whether the media was changed during the time since the motor previously stopped. Determination of media change is done by checking light intensity value.
- the light detecting unit detects light intensity through the media and checks whether the detected value is same as the stored value. If a change is detected between the two values, then it is determined that new media have been loaded into the label printer; or, if no change is detected, the label printer assumes that the loaded media to be the same as which was previously placed under the light source unit.
- the label printer When it is determined that the media has changed, the label printer also checks whether the media is out of stock. If no more media remains in the label printer, then the label printer stops printing and displays a message indicating no more media is available. When there is media left to be printed, the label printer calibrates the light detecting unit to detect a gap or a liner of the media.
- predetermined values of light intensity for a gap or liner part of the media and for a liner label part for of the media are compared to measured values of light.
- the light source unit increases or decreases light intensity so that the light detecting unit can detect a predetermined value of light intensity for the gap or the liner part of the media, and/or a predetermined value of light intensity for the label part of the print media.
- a liner label part is placed under the light source unit in the beginning of the auto-calibration process.
- the light source unit increases or decreases the light intensity so that the detected value reaches a certain predetermined value designated for the liner label part.
- This invention is not limited to this assumption, and can be extended to include other embodiments that assume a liner or gap part is placed under the light source unit in the beginning of the auto-calibration process, or that assume the light source unit emits light only with a predetermined level of light intensity and the light detecting unit detects a transition of light intensity between non-predetermined ranges of light intensity through the media.
- the feeding unit now feeds the media by starting the motor until a range transition of light intensity through the media is detected.
- the label printer checks whether the transition is downward or upward. If it is a downward transition from the predetermined value for the paper/liner label part to a detected value at the time of the transition, the label printer updates the predetermined value for the liner or gap with the predetermined value for the paper/liner label part and the predetermined value for the liner label part with the detected value. When a downward an upward transition is detected, the calibration is not necessary and the label printer starts printing labels on the media.
- the setting unit sets the location where a second transition occurs as the starting position for printing. If a downward transition occurs first, then an upward transition will follow when a gap part is fed under the light source unit. If an upward transition occurs first, then a downward transition will follow when a liner label part right after the gap part is fed under the light source. Thus, the second transition occurs at boundaries of the gap part, namely, starting and ending of the gap between labels. Since a the gap portion is not used for label printing, auto-calibration for setting a starting position for label printing is done when detecting the second transition. After printing a label and pausing the motor, the value of light that the light detecting unit detects at the time printing is completed is recorded. In this manner, a stored or recorded value can be compared with a detected value when the label printer restarts the auto-calibration process.
- the light detecting unit provides an upward transition signal and a downward transition signal. If the setting unit receives one pattern of signals whereby an upward transition signal is received first and a downward transition signal second, then the setting unit sets the starting position for printing at the point at which it receives the second signal, e.g., the downward transition signal. This represents the location where the end of the gap portion or the start of the liner label portion is located. If the setting unit receives another pattern of signals, e.g., a downward transition signal first and an upward transition signal second, then the setting unit waits for a third signal, another downward transition signal, and sets the starting position for printing when it receives the third signal, i.e., the second downward transition signal.
- the setting unit receives one pattern of signals whereby an upward transition signal is received first and a downward transition signal second, then the setting unit sets the starting position for printing at the point at which it receives the second signal, e.g., the downward transition signal. This represents the location where the end of the gap portion or the start of the liner label
- the label printer sets the starting position for printing with precision.
- Embodiments in accordance with this disclosure are not limited to this kind of label media and can be extended to other media whose starting position for printing is a place other than the end of gap part.
- the media is a label type or tag stock type. If it is a label type, labels are attached on the media so that a label part has two layers and a boundary part is only one layer, the liner.
- the light detecting unit detects an upward transition of light intensity when the boundary region passes through the light beam because the boundary part only has one layer (e.g., the liner) and thus the emitted light would pass through the boundary more readily than at the beginning.
- the media is tag stock, perforations are along boundaries of the label, an index mark, or an index hole or slot is located on or near the boundary of each label.
- the light detecting unit detects an upward transition of light intensity when the boundary part, the perforations along the boundaries, and index mark, or the index hole or slot, is fed under the light source unit because most of the emitted light would pass through directly to the light detecting unit. Therefore, embodiments of the present disclosure may be applied to both types of labels in a similar manner.
- the intensity of the light source unit e.g., LED current or the transistor gain
- the intensity of the light source unit can be adjusted to assure that there is adequate differences in the levels to accurately detect range transitions and the start of a new label or tag. Detecting the levels at the end of media motion and start of motion the printer can determine if additional calibration is required.
- a sensor apparatus for a label printer includes a feeding unit configured to feed media of labels, a setting unit configured to set a starting position of each label of the media for the label printer, a light source unit configured to emit light through the media, and a light detecting unit configured to detect a range transition of light intensity through the media between a first range and a second range of light intensity of the emitted light, and send a signal to the setting unit when the range transition is detected, wherein the first range is lower than the second range, and the setting unit sets the starting position of each label of the media for the label printer when the setting unit receives a second signal from the light detecting unit.
- a method of automatic setting for a label printer includes feeding media of labels, emitting light on the media, detecting a range transition of light intensity through the media between a first range and a second range of light intensity of the emitted light, sending a signal when the range transition is detected, receiving the signal, and setting a starting position of the media for the label printer when receiving the signal receives a second signal.
- FIG. 1 shows an embodiment of a compact printer in accordance with the present disclosure having a top cover in a closed position
- FIG. 2 shows the FIG. 1 embodiment of a compact printer having a top cover in an open position
- FIG. 2A shows the FIG. 1 embodiment of a compact printer having a top cover in an open position and media positioned along a print path;
- FIG. 3 is a schematic diagram of an embodiment of a media detection system in accordance with the present disclosure.
- FIG. 4 is a flowchart illustrating a method of media detection in accordance with the present disclosure.
- orientation e.g., “top”, “bottom”, “up”, “down”, “left”, “right”, “clockwise”, “counterclockwise”, and the like, are used for illustrative purposes with reference to the figures and features shown therein. It is to be understood that embodiments in accordance with the present disclosure may be practiced in any orientation without limitation.
- like-referenced numbers represent elements which may perform the same, similar, or equivalent functions.
- FIGS. 1, 2, and 2A present an example embodiment of a printer 10 in accordance with the present disclosure.
- the printer 10 includes a bottom housing 18 and a selectively positionable top cover 11 that may be positioned in a closed position as shown in FIG. 1 and an open position as shown in FIG. 2 .
- Top cover 11 and bottom housing 18 are pivotably joined by a hinge 19 .
- Top cover 11 includes a user interface panel 12 , one or more user input devices 14 , and one or more indicators 13 .
- User interface panel 12 many be any suitable form of display panel, including without limitation an LCD screen.
- User input device 14 may be any suitable form of input device, e.g., a snap dome or membrane pushbutton switch.
- Indicator 13 may be any suitable indicator, such as without limitation a light-emitting diode (LED). Indicator 13 may illuminate to indicate the status an operational parameter, e.g., power, ready, media empty, media jam, self test, and the like.
- Printer 10 includes a power switch 15 .
- a pair of latches 16 are disposed on either side of top cover 11 to retain top cover 11 in a closed position, and may be disengaged using finger pressure to facilitate opening of top cover 11 .
- a media slot 17 is defined in bottom housing 18 and provides a point of egress for media, which may be advantageous with self adhesive labels whereby the labels peel away from the substrate upon exiting the printer.
- Top cover 11 includes a print frame assembly 20 (see FIG. 2 ) pivotably mounted therein.
- Print frame assembly 20 includes a ribbon supply 22 and a ribbon take up spool 21 that are arranged to supply transfer ribbon (not explicitly shown) across a print head assembly 38 .
- a pair of media support members 24 extend from a print bed 26 and are adjustable across a lateral axis 32 of the printer 10 to accommodate a print media supply 25 of various widths.
- Print media 25 includes a plurality of labels 23 , which may be self-adhesive style labels, releasably disposed on a backing material 27 . Each label 23 is separated from the adjacent label 23 by an inter-label gap 28 at which the backing material 27 is exposed.
- a media drive 39 is configured to advance labels 23 from media supply 25 , to a print head assembly 38 , and through media slot 17 .
- labels 23 feed from print media supply 25 along the print bed 26 along a longitudinal axis 31 of the printer 10 .
- a light detector unit 37 is positioned on print bed 26 . In the present embodiment, light detector unit 37 rides in a transverse slot 36 defined in print bed 26 to enable selective positioning of light detector unit 37 along the lateral axis 32 , however, in other embodiments light detector unit 37 may be positioned at a fixed location.
- a light source unit 29 is positioned on print head assembly 38 .
- light source unit 29 rides in a transverse slot 30 defined in print head assembly 38 to enable selective positioning of light source unit 27 along the lateral axis 32 , however, in other embodiments light source unit 29 may be positioned at a fixed location.
- Light detector unit 37 and light source unit 29 are arranged such that, when top cover 11 is positioned in a closed position, a light beam emitted from light source unit 29 is aligned with light detector unit 37 .
- light source unit 29 may provide a relatively narrow, focused beam while in other embodiments, light source unit 29 may provide a wide or ribbon-like beam spanning laterally across at least a portion of the print media supply.
- light detector unit 37 may provide a relatively narrow light sensing regions while in still other embodiments, light detector unit 37 may provide a wide or ribbon-like light sensing region spanning laterally across at least a portion of the print media supply.
- an embodiment of a printing system 100 in accordance with the present disclosure includes a media supply 110 that includes label media 113 having a plurality of labels 111 disposed on a backing 112 .
- the labels 111 are separated by a gap 114 at which the backing 112 is exposed.
- media supply 110 is shown as roll or web media, but it is to be understood that other types of media supplies may be successfully utilized by a printing system in accordance with the present invention, such as without limitation, fanfold media.
- media supply 110 may include tag or card stock which does not require backing 112 , and in these embodiments no backing is exposed at gap 114 and instead gap 114 is defined by a notch or other similar feature that separates labels 111 .
- Printing system 110 includes a media drive 120 that is configured to advance label media 113 from media supply 110 to a print head assembly 150 .
- media drive 120 includes a motor 121 having an output shaft operably coupled to a drive roller 122 that is configured to mechanically engage media 113 to impart advancing motion thereto.
- drive roller 122 is frictionally engaged with media 133 .
- drive roller 122 may include a pin feed arrangement whereby one or more mechanical features (not explicitly shown) project radially from drive roller 122 to engage corresponding openings provided by media 113 , e.g., along one or both edges of media 113 .
- Media drive 120 may include a pinch roller 123 that is configured to assist or enhance positive mechanical engagement between media 113 and drive roller 122 . While in the presently illustrated embodiment media drive 120 is disposed upstream of print head assembly 150 (e.g., between media supply 110 and print head assembly 150 whereby media drive 120 pulls media from media supply 110 and pushes media toward print head assembly 150 ), in other embodiments media drive 120 may be positioned on the downstream side of print head assembly 150 whereby media drive 120 pulls media through print head assembly 150 and from media supply 110 .
- Print head assembly 150 is configured to imprint visible indicia upon media 113 , and includes one or more print elements (not explicitly shown) which may include, without limitation, a thermal transfer element, an ink transfer element, a mechanical print element (e.g., dot matrix, impact print elements, etc.) and the like. In some embodiments, print head assembly 150 includes a plurality of individually addressable thermal heating elements (not explicitly shown).
- Printer 100 includes a media detection unit 132 that includes a light source unit 130 configured to direct a light beam 131 though media 113 towards a light detecting unit 140 .
- media detection unit 132 is positioned downstream of and substantially adjacent to print head assembly 150 , while in other contemplated embodiments, media detection unit 132 may be positioned upstream of print head assembly 150 and/or may be positioned substantially apart from print head assembly 150 .
- Print system 100 includes a setting unit 105 , which includes a number of features that interoperate with the aforedescribed elements.
- Setting unit 105 includes a controller 160 that includes in operative communication a processor 161 and a memory 162 .
- Memory 162 may include volatile memory (e.g., RAM) and may include non-volatile and/or non-transitory memory (e.g., ROM, EPROM, EEPROM, flash memory, disk memory, and the like).
- Setting unit 105 includes a communications interface 170 in operable communication with controller 160 that is configured to facilitate the communication of operational data to and from print system 100 via a communications ports 171 .
- Communications interface 170 may be configured to communicate via any one or a combination of wired or wireless communication protocols, including without limitation USB, IEEE 1394 “Firewire”, serial (RS-232, RS-422, RS-485, and so forth), parallel IEEE 1284 “Centronics”, Ethernet, TCP/IP, 802.11 wireless (“WiFi”), Bluetooth, or any other communication protocol now or in the future known.
- Communicated data may include, without limitation, label data, formatting data, printer status, media status, environmental data, font data, barcode data, quantity data, handshaking, and so forth, communicated to and from a host machine, application server, etc.
- Communicated data may include data generated by a software program, e.g., a label generation application or submodule.
- Print system 100 includes a user interface panel 165 in operable communication with controller 160 that may include visual and audio indicators.
- Light source interface 135 enables communication between controller 160 and light source unit 130 , and may include circuitry configured to vary the intensity and/or color of light emitted by light source unit 130 under the direction of an algorithm. In some embodiments, such an algorithm may be executed by processor 161 . In some embodiments, light source interface 135 may include, without limitation, at least one of a constant current source, a digital-to-analog (D/A) converter, or a pulse-width modulator. In some embodiments, light source interface 135 may include a sensing circuit configured to sense an operating parameter of light source unit 130 , e.g., operating current, resistance, output level, etc. Light source interface 135 may include a circuitry configured to provide power to light source unit to effectuate operation thereof.
- D/A digital-to-analog
- Light source interface 135 may include a circuitry configured to provide power to light source unit to effectuate operation thereof.
- Setting unit 105 includes light detector interface 145 that enables communication between controller 160 and light detector unit 140 , and may include circuitry configured to condition, read, sample, convert, digitize and/or scale a signal received from light detector unit 140 for use by controller 160 .
- light detector interface 145 may include an analog-to-digital (A/D) converter, a power circuit configured to provide power to light detector unit 140 .
- A/D analog-to-digital
- light detector interface 145 may include circuit elements configured to bias a phototransistor (not explicitly shown) in the proper operating region to facilitate the effective detection of light beam 131 .
- a phototransistor not explicitly shown
- Print head interface 155 may include one or more drivers that are configured to provide power to the one or more print elements of print head assembly 150 , and additionally or alternatively may include circuitry configured to communicate one or more operational and/or identification parameters with print head 150 .
- print head assembly 150 and/or print head interface 155 may be configured to communicate an operating temperature, an authentication code, a print command, and the like.
- Setting unit 105 includes a media drive interface 125 that is configured to provide drive signals to media drive 120 and/or to receive one or more sensor signals from media drive 120 for conveyance to controller 160 .
- media drive interface 125 may include a stepper motor driver circuit configured to provide a full step drive signals, half step drive signals, wave drive signals, and/or microstepping signals.
- media drive 120 includes a servo motor 121
- media drive interface 125 may include a servo driver circuit, and a feedback circuit configured to communicate positional (e.g., rotational) information to controller 160 .
- Other forms of drive signals are contemplated to accommodate any suitable media drive arrangement, e.g., linear steppers, brushless motors, commutator motors, DC motors, AC motors, and so forth.
- a method 200 for automatically sensing and setting label length in a label printer is illustrated.
- the printer is idle and ready to perform an operation such as a print event (e.g., a print command incorporating media feeding substantially concurrently with printing indicia thereupon) or a feed event (e.g., a form-feed command to advance print through the printer).
- a print event or a feed event occurs (e.g., a print command or a feed command is received by the printer).
- a determination is made as to whether the print media has been changed since the last operation, which indicates that media calibration is required.
- a light measurement MCURRENT is taken by light detector unit 140 and compared to a measurement MPREV taken at the conclusion of a prior print or feed event. If the two values are equal (or, in some embodiments, within a predetermined tolerance), it is determined that the print media has not changed. If, however, the two values are unequal (or, in some embodiments, outside a predetermined tolerance), or if no such previous measurement is available, it is determined the print media has changed.
- step 220 a determination is made as to whether an out-of-stock condition exists (e.g., end of roll or no media installed).
- an out-of-stock condition exists (e.g., end of roll or no media installed).
- a light measurement is taken by light detector unit 140 and compared to a predetermined out-of-stock value.
- the predetermined out-of-stock value is commensurate with a value corresponding to an unobstructed light path 131 existing between light source unit 130 and light detector unit 140 . If, in step 225 it is determined an out-of-stock condition exists, then in step 225 a fault condition is indicated.
- a fault indication may include presenting an alarm to the user indicating that a new supply of label media needs to be loaded; such an alarm may include without limitation, a visual indication and/or an audible indication.
- an out-of-stock status may be communicated via communication interface 170 .
- step 230 a media calibration is undertaken.
- Two preliminary light intensity levels for light source unit 130 are chosen to accommodate the two different portions of the label: a first, lower, light level L 1 corresponding to the gap 114 and a second, higher light level L 2 corresponding to the label 111 .
- the values of L 1 and L 2 can be reversed (e.g., L 1 is assigned the higher level and L 2 is assigned the lower level.
- the distinct values of L 1 and L 2 enable light detector unit 140 to detect a transition between gap 114 and label 111 as label media 113 advances through print system 100 .
- step 235 light source unit 130 is set at the higher (L 2 ) level, and in step 240 , label media 113 is advanced (e.g., to execute a print operation or feed operation).
- L 2 e.g., higher
- an assumption is made that the light source unit 130 is calibrated to provide the expected light transmission though the label 111 portion of label media 113 , therefore, a light transmission level is expected to transition from high to low is expected a predetermined value to a higher detected value when a gap 114 is reached.
- light detector unit 140 detects the light beam 131 passing through label media 113 .
- the output of light detector unit 140 is monitored, preferably in a substantially continuous manner in step 250 , to determine whether the level of detected light rises from a low level to a higher level increases from a predetermined value to a higher detected value (as expected per the assumption set forth above), or falls from a lower level to an even lower level decreases from a predetermined value to a lowe detected value (in contravention of the assumption).
- step 255 it is determined that the level of detected light rises from a low level to a higher level increases from a predetermined value to a higher detected value, then the assumption was correct. That is, initially, a gap 114 label portion 111 was positioned within light beam 131 , blocking some or all of light beam 131 and lowering the level of light detected by light detector unit 140, and subsequently a label 111 gap 114 passed into the beam, occluding some of all of allowing more light from light beam 131 to transmit through the gap 114 and lowering increasing the level of light detected by light detector unit 140 . In this case, the current output level L 2 of light source unit 130 is maintained, and the process continues with step 265 as discussed below.
- step 255 it is determined that the level of detected light decreases from a low level to a lower level predetermined value to a lower detected value, then the assumption was incorrect in that, initially, a gap 114 was positioned within light beam 131 and subsequently a label 111 portion passed into the beam, thus decreasing the level of light detected by light detector unit 140 .
- the position of the label 111 transition (edge) is recorded, step 260 is performed wherein output level of light source unit 130 is changed to L 1 (e.g., lowered).
- step 265 the position of the label 111 transition (edge) is recorded and the commanded operation is performed (e.g., a print command, a feed command, etc.).
- the label media 113 is advanced until the next gap 114 is positioned in the light beam 131 (e.g., positioned at the start of the next label 111 ).
- step 270 a light measurement MPREV is taken at the conclusion of the commanded operation for use during the next commanded operation, as described above.
- a printer according to the present disclosure includes the capability to automatically adjust and adapt to a wide variety of media supplies, particularly those of various lengths, of various label stock and arrangements, and of various light transmissivity.
Landscapes
- Handling Of Sheets (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US15/586,455 USRE47928E1 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
Applications Claiming Priority (4)
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---|---|---|---|
US201161579258P | 2011-12-22 | 2011-12-22 | |
US15/586,455 USRE47928E1 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
PCT/US2012/070605 WO2013096439A1 (fr) | 2011-12-22 | 2012-12-19 | Appareil et procédé de détection de support |
US14/368,113 US9024988B2 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
Publications (1)
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USRE47928E1 true USRE47928E1 (en) | 2020-04-07 |
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Family Applications (2)
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US14/368,113 Ceased US9024988B2 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
US15/586,455 Active USRE47928E1 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
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US14/368,113 Ceased US9024988B2 (en) | 2011-12-22 | 2012-12-19 | Media detection apparatus and method |
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US (2) | US9024988B2 (fr) |
EP (1) | EP2794278B1 (fr) |
CA (1) | CA2860207A1 (fr) |
WO (1) | WO2013096439A1 (fr) |
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JP6408789B2 (ja) * | 2014-05-26 | 2018-10-17 | サトーホールディングス株式会社 | ラベル供給装置 |
JP6469456B2 (ja) * | 2015-01-21 | 2019-02-13 | 株式会社沖データ | 画像形成装置、画像形成方法および画像形成プログラム |
JP2018187837A (ja) * | 2017-05-02 | 2018-11-29 | 株式会社寺岡精工 | 印刷装置 |
EP3991975B1 (fr) * | 2019-06-28 | 2023-11-15 | Sato Holdings Kabushiki Kaisha | Imprimante |
US20220388317A1 (en) * | 2021-06-08 | 2022-12-08 | Chien-Wen Chang | Label-sensing method |
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Also Published As
Publication number | Publication date |
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CA2860207A1 (fr) | 2013-06-27 |
US20140347431A1 (en) | 2014-11-27 |
WO2013096439A1 (fr) | 2013-06-27 |
EP2794278A4 (fr) | 2016-10-26 |
EP2794278A1 (fr) | 2014-10-29 |
US9024988B2 (en) | 2015-05-05 |
EP2794278B1 (fr) | 2019-07-24 |
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