Method and system of determining a width of a printer ribbon

Abstract

A printer ribbon supply spindle assembly is provided. The ribbon spindle has multiple segments contiguous to each other. The spindle assembly includes a commutator disposed circumferentially on the first segment of the ribbon spindle and two carbon brushes connected to a voltage source and disposed generally in electrical contact with and on either side of the commutator. The voltage source, the carbon brushes, and the commutator complete an electrical circuit. C-shaped conductive springs are disposed over each of the multiple segments. The c-shaped conductive springs compress when covered by a printer ribbon and become in electrical contact with the commutator and adjacent compressed c-shaped springs, forming additional parallel circuits. An electronic element is disposed at the center of the c-shaped conductive springs. Measuring a change in the circuit due the additional parallel circuits with the electronic element indicates the printer ribbon width.

Description

FIELD OF THE INVENTION

The present invention relates to printer ribbon supply spindles and particularly to sensing the ribbon width of a ribbon loaded on such a printer ribbon supply spindle.

BACKGROUND

Generally speaking certain printers employing ribbons on spindles allow various printer ribbon widths to be loaded on the spindle for different printing media. Printer ribbons of different widths have different torque requirements. The torque requirements affect print quality, print registration, ribbon slippage, and ribbon wrinkling. Thus it is important for the printer torque value to be set appropriate to the ribbon width loaded on the ribbon spindle.

While systems exist to automatically sense the size of print media loaded into a printer by having an electrical feedback connected to the media size adjustment mechanism, nothing such exists for printer ribbon rolls. Further such systems would not be tell the printer or user anything about the proper torque values to be used for any given printing job.

Therefore, a need exists for an automatic system which can sense a printer ribbon width on a printer ribbon spindle assembly and feedback this information to an onboard processor which can implement torque requirements.

SUMMARY

Accordingly, in one aspect, the present invention embraces a printer ribbon supply spindle assembly. Generally, the printer ribbon supply spindle assembly has a base and multiple segments. The first of the multiple segments being contiguous to the base, and each subsequent segment of the multiple segments being contiguous to the previous segment of the multiple segments.

In an exemplary embodiment, the printer ribbon supply spindle is comprised of a commutator disposed circumferentially on the first segment of the ribbon spindle, and at least two carbon brushes connected to a voltage source. The carbon brushes are disposed generally on either side of the commutator and in electrical contact with the commutator. Thus, the voltage source, the carbon brushes, and the commutator form a closed electrical circuit. The printer ribbon supply spindle further is comprised of a c-shaped conductive spring disposed on each of the multiple segments. The c-shaped conductive springs each have two ends and a center portion. The c-shaped conductive springs are in an uncompressed state when there is no printer ribbon on the ribbon spindle positioned over the c-shaped conductive spring on each of the segments. The c-shaped conductive springs compress when a printer ribbon is positioned on the ribbon spindle over the c-shaped conductive spring on each of the segments. In particular, the c-shaped conductive spring over the second of the multiple segments has a length such that when the c-shaped conductive spring is in the compressed state, the two ends of the c-shaped conductive spring make electrical contact with the commutator, completing a first additional electrical circuit in parallel with the closed electrical circuit. Further, the c-shaped conductive springs over subsequent segments of the multiple segments have lengths such that when the c-shaped conductive springs are in the compressed state, the two ends of the c-shaped conductive springs make electrical contact with the c-shaped conductive spring of the previous segment, thus completing additional electrical circuits in parallel with the closed electrical circuit. The printer ribbon supply spindle assembly is further comprised of a basic electronic element disposed proximate to each of the center portions of the c-shaped conductive springs and in electrical contact with the center portion of the c-shaped conductive springs.

In another exemplary embodiment of the printer ribbon supply spindle assembly, the basic electronic element is a resistor.

In another exemplary embodiment of the printer ribbon supply spindle assembly, the basic electronic element is a dielectric material.

In another exemplary embodiment of the printer ribbon supply spindle assembly, the center portion of the c-shaped conductive springs is comprised of two conductive plates and a dielectric material. The conductive plates are disposed on either side of the dielectric material. The conductive plates come into contact with the dielectric material based upon the c-shaped conductive springs being compressed.

In yet another exemplary embodiment, the printer ribbon supply spindle assembly further comprises, a meter in the closed electrical circuit. The meter is sensitive to the electrical properties of the basic electronic element, such that the reading on the meter indicates how many additional parallel circuits are completed.

In another exemplary embodiment of the printer ribbon supply spindle assembly, the closed electrical circuit comprised of the voltage source, the carbon brushes, and the commutator also includes the basic electronic element.

In another exemplary embodiment of the printer ribbon supply spindle assembly, the c-shaped conductive springs are metallic.

In another aspect, the present invention embraces a printer spindle assembly.

In an exemplary embodiment, the printer spindle assembly is comprised of multiple segments. The first segment of the multiple segments is adjacent to a base. Each subsequent segment of the multiple segments is adjacent to the previous segment of the multiple segments. The printer spindle assembly is also comprised of a commutator, at least two brushes, and a c-shaped conductive spring disposed on each of the multiple segments. The commutator is disposed circumferentially on the first segment of the spindle. The brushes are connected to a voltage source and are disposed generally on either side of the commutator. The brushes are in electrical contact with the commutator. The voltage source, the brushes, and the commutator form a closed electrical circuit. The c-shaped conductive spring has two ends and a center portion. Further, the c-shaped conductive springs are in an uncompressed state in the absence of a printer ribbon over the one or more c-shaped conductive springs. The c-shaped conductive springs are in a compressed state in the presence of a printer ribbon positioned over the one or more c-shaped conductive springs.

In another exemplary embodiment of the printer spindle assembly, the c-shaped conductive spring on each segment of the multiple segments has a length such that when the c-shaped conductive spring is in the compressed state, the two ends of the c-shaped conductive spring make electrical contact with the commutator or the c-shaped conductive spring of a previous segment, thus completing an additional electrical circuit in parallel with the closed electrical circuit.

In another exemplary embodiment of the printer spindle assembly, a basic electronic element is disposed proximate to the center portions of each of the c-shaped conductive springs and in electrical contact with the center portion of the c-shaped conductive springs.

In another exemplary embodiment of the printer spindle assembly, the basic electronic element is a resistor.

In another exemplary embodiment of the printer spindle assembly, the basic electronic element is a dielectric material.

In another exemplary embodiment of the printer spindle assembly, the center portion of the c-shaped conductive springs is comprised of two conductive plates and a dielectric material. The conductive plates are disposed on either side of the dielectric material. The conductive plates come in contact with the dielectric material when upon the c-shaped conductive springs are compressed.

In yet another exemplary embodiment, the printer spindle assembly further comprises a meter. The meter is connected to the closed electrical circuit, such that the reading on the meter indicates how many additional parallel circuits are completed.

In another exemplary embodiment of the printer spindle assembly, each additional circuit includes the basic electronic element.

In another exemplary embodiment of the printer spindle assembly, the c-shaped conductive springs are metallic.

In yet another exemplary embodiment, the printer spindle assembly further comprises a processor communicatively linked to the meter. The processor is configured to determine a width of a ribbon roll loaded on the printer spindle based upon a reading on the meter and to implement printer functions based upon the reading on the meter.

In another exemplary embodiment of the printer spindle, the processor is further configured to send information on the width of the ribbon roll loaded on the spindle to a display.

In another exemplary embodiment of the printer spindle assembly, the printer functions include torque requirements of the printer.

In another exemplary embodiment of the printer spindle, the basic electronic element is a resistor. The printer spindle assembly further comprises a meter. The meter is connected to the closed electrical circuit. The meter reads the resistance of the completed circuits.

In another exemplary embodiment of the printer spindle assembly, the basic electronic element is a dielectric material. The printer spindle assembly further comprises a meter. The meter is connected to the closed electrical circuit. The meter reads capacitance changes in the circuits completed.

In another aspect, the present invention embraces a system for determining the width of a ribbon roll mounted on a printer ribbon spindle.

In an exemplary embodiment, the system is comprised of: a printer ribbon supply spindle having a base and multiple segments. The first of the multiple segments are contiguous to the base, and each subsequent segment of the multiple segments is contiguous to the previous segment of the multiple segments. The system further comprises a commutator disposed circumferentially on the first segment of the ribbon spindle and at least two carbon brushes connected to a voltage source. The carbon brushes are disposed generally on either side of the commutator and are in electrical contact with the commutator. Thus, the voltage source, the carbon brushes, and the commutator form a closed electrical circuit. The system further comprises a c-shaped conductive spring disposed on each of the multiple segments. Each of the c-shaped conductive springs has two ends and a center portion. The c-shaped conductive springs are in an uncompressed state when no printer ribbon is loaded on the ribbon spindle over the c-shaped conductive spring on each of the segments. On the other hand, the c-shaped conductive springs are in a compressed state when a printer ribbon is loaded on the spindle and positioned over the c-shaped conductive spring on each of the segments. In particular, the c-shaped conductive spring over the second of the multiple segments has a length such that when the c-shaped conductive spring is in the compressed state, the two ends of the c-shaped conductive spring make electrical contact with the commutator, thus completing a first additional electrical circuit in parallel with the closed electrical circuit. In a similar way, the c-shaped conductive springs over subsequent segments of the multiple segments have lengths such that when the c-shaped conductive springs are in the compressed state, the two ends of the c-shaped conductive springs make electrical contact with the c-shaped conductive spring of the previous segment, thus completing additional electrical circuits in parallel with the closed electrical circuit. The system further is comprised of a basic electronic element disposed proximate to each of the center portions of the c-shaped conductive springs and in electrical contact with the center portion of the c-shaped conductive springs. Further, a meter is provided in the closed electrical circuit. The meter is sensitive to the electrical properties of the basic electronic element, such that the reading on the meter indicates how many additional parallel circuits are completed. The system further comprises a processor communicatively linked to the meter. The processor is configured to determine the width of the ribbon roll loaded on the printer ribbon supply spindle based upon the reading on the meter. Further, the processor is configured to implement printer functions based upon the reading on the meter.

In another exemplary embodiment of the system, the basic electronic element is a resistor, and the meter reads the resistance of the completed circuits.

In another exemplary embodiment of the system, the basic electronic element is a dielectric material, and the meter reads capacitance changes in the circuits completed.

In another exemplary embodiment of the system, the processor is further configured to send information on the width of the ribbon roll loaded on the printer ribbon supply spindle to a display on the printer.

In another exemplary embodiment of the system, the printer functions include torque requirements of the printer.

In another aspect, the invention embraces a method of determining a width of a printer ribbon loaded on a ribbon spindle having multiple segments.

In an exemplary embodiment, the method comprises the steps of: providing, on a base segment of the ribbon spindle, a commutator electrically in contact with two carbon brushes disposed on either side of the commutator; forming a closed electrical circuit by connecting the two carbon brushes to a voltage source; providing compressible conductive elements on each of the multiple segment, and being in electrical contact with each other and with the closed electrical circuit when compressed, thus forming additional completed parallel electrical circuits with the closed electrical circuit when the conductive elements are compressed; loading the printer ribbon on the ribbon spindle; compressing at least one of the compressible conductive elements under the printer ribbon; measuring the change in electrical properties of the closed electrical circuit due to the additional completed parallel electrical circuits; determining, based upon the measuring step, how many compressible conductive elements are compressed under the loaded printer ribbon; and determining the printer ribbon width from the determination of the number of compressible conductive elements being compressed under the loaded printer ribbon.

In another exemplary embodiment, the method further comprises the step of: providing the compressible conductive elements with a basic electronic element. The change in electrical properties measured in the measuring are due to the basic electronic elements included in the completed additional parallel circuits formed by the compressing step.

In another exemplary embodiment of the method, the basic electronic element is a resistor, and the measuring step measures a change in resistance.

In another exemplary embodiment of the method, the basic electronic element is a dielectric material, and the measuring step measures a change in capacitance.

In another exemplary embodiment, the method further comprises the step of displaying the ribbon width determined in the second determining step on a printer display.

In yet another exemplary embodiment, the method further comprises the step of implementing printer functions based upon the ribbon width determined in the second determining step.

In another exemplary embodiment of the method, the implementing step is accomplished with a processor. The printer functions implemented by the processor include torque requirements.

In another exemplary embodiment of the method, the measuring step is accomplished with an electrical meter sensitive to the electrical properties of the basic electronic element.

In another aspect, the present invention embraces a method of determining a width of a printer media loaded on a media spindle having multiple segments.

In an exemplary embodiment, the method includes the steps of: (i) loading a printer media on a spindle; (ii) providing, on a base segment of a spindle, a commutator electrically in contact with two brushes disposed on either side of the commutator; (iii) forming a closed electrical circuit by connecting the two brushes to a voltage source; (iv) providing compressible conductive elements on each of the multiple segments on the spindle; (v) compressing one or more of the compressible conductive elements under the printer media, the compressible conductive elements when compressed being in electrical contact with each other and with the closed electrical circuit, thus forming additional completed parallel electrical circuits with the closed electrical circuit; (vi) measuring a change in electrical properties of the closed electrical circuit due to the additional completed parallel electrical circuits; (vii) determining, based upon the measured change, how many compressible conductive elements are compressed under the loaded printer media; and (viii) determining a printer media width from the determination of the number of compressible conductive elements being compressed under the loaded printer media.

In another exemplary embodiment of the method, the media is selected from a ribbon, a label, a receipt, and a thermal transfer ribbon.

In another exemplary embodiment, the method further comprises the step (ix) of providing the compressible conductive elements with a basic electronic element.

In another exemplary embodiment of the method, the change in electrical properties measured in the measuring step are due to the basic electronic elements included in the completed additional parallel circuits formed by the compressing step.

In another exemplary embodiment of the method, the basic electronic element is a resistor.

In another exemplary embodiment of the method, the measuring step measures a change in resistance.

In another exemplary embodiment of the method, the basic electronic element is a dielectric material. The measuring step measures a change in capacitance.

In yet another exemplary embodiment, the method further comprises the step (x) of displaying the media width determined in the second determining step on a display.

In another exemplary embodiment, the method further comprises the step (xi) of implementing printer functions based upon the media width determined in the second determining step.

In another exemplary embodiment of the method, the printer functions include torque requirements.

In another exemplary embodiment of the method, the measuring step is accomplished with an electrical meter sensitive to the electrical properties of the basic electronic element.

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

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts a printer ribbon spindle assembly with the compressible clamps uncompressed in accordance with an exemplary embodiment of the present invention.

FIG. 2 schematically depicts the commutator and carbon brushes in accordance with an exemplary embodiment of the present invention.

FIG. 3 schematically depicts the printer ribbon spindle assembly of FIG. 1 with the compressible clamps compressed, in accordance with an exemplary embodiment of the present invention.

FIG. 4 schematically depicts a printer ribbon spindle assembly with the compressible clamps uncompressed in accordance with another exemplary embodiment of the present invention.

FIG. 5 schematically depicts the printer ribbon spindle assembly of FIG. 4 with the compressible clamps compressed, in accordance with an exemplary embodiment of the present invention.

FIG. 6 schematically depicts an exemplary embodiment of a system for determining a width of a printer ribbon in accordance with the present invention.

FIG. 7 depicts in a flowchart an exemplary embodiment of the method of determining a width of a printer ribbon in accordance with the present invention.

FIG. 8 depicts in a flowchart an exemplary embodiment of the method of determining a width of a printer media in accordance with the present invention.

DETAILED DESCRIPTION

The present invention embraces a printer ribbon supply spindle assembly. The printer ribbon supply spindle assembly generally has a base and multiple segments. The first of the multiple segments is contiguous to the base, and each subsequent segment of the multiple segments is contiguous to the previous segment of the multiple segments.

Referring now to FIG. 1, in an exemplary embodiment, the printer ribbon supply spindle assembly (10) is depicted with base (12) and multiple segments 14a-14h. The first segment (14a) is contiguous to the base (12). The subsequent segments (14b-14h) are contiguous to the previous segment. For example, segment (14b) is contiguous to segment (14a). Likewise, segment (14c) is contiguous to segment (14d), and so on. The segments may be, for example, one inch long. A two inch ribbon supply will cover 2 segments; a four inch ribbon supply will engage 4 segments. In the present embodiment, the printer ribbon supply spindle (10) has eight segments (14a-14h); however other numbers of segments are possible.

In an exemplary embodiment schematically depicted in the present FIG. 1, the printer ribbon spindle assembly (10) is comprised of a commutator (20) disposed circumferentially on the first segment of the ribbon spindle (10) contiguous to the base (12). Two carbon brushes (22a and 22b) are provided and connected to a voltage source (designated generally as 24 in this Figure). The carbon brushes (22a and 22b) are disposed generally on either side of the commutator (20) and are in electrical contact with the commutator. The arrangement of the carbon brushes (22a and 22b) with the commutator (20) in isolation is illustrated in FIG. 2.

Referring back to FIG. 1, the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20) form a closed electrical circuit.

The printer ribbon spindle assembly (10) is further comprised of a series of c-shaped conductive springs (30a-30g) disposed on each of the multiple segments. Each of the c-shaped conductive springs (30a-30g) has two ends (32a and 32b) and a center portion (34a-30h). The c-shaped conductive springs (30a-30g) remain in an uncompressed state (as shown) when no printer supply ribbon is loaded on the printer ribbon spindle assembly (10). Preferably, the c-shaped conductive springs (30a-30g) are metallic.

The c-shaped conductive spring (30a) over the second (14b) of the multiple segments has a length such that when the c-shaped conductive spring (30a) is compressed, the two ends (32a and 32b) of the c-shaped conductive spring (30a) will make electrical contact with the commutator (20), thus completing a first additional electrical circuit in parallel with the closed electrical circuit of the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20).

The c-shaped conductive springs (30b-30g) over subsequent segments of the multiple segments (14c-14h), have lengths such that when the c-shaped conductive springs (30b-30g) are compressed, the two ends (32a and 32b) of each of the c-shaped conductive springs (30b-30g) make electrical contact with the c-shaped conductive spring of the previous segment, thus completing additional electrical circuits in parallel with the closed electrical circuit consisting of conductive spring (30a) and the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20). This arrangement will be shown more clearly herein below in conjunction with FIG. 3.

The printer ribbon spindle assembly (10) is further comprised of basic electronic elements (40b-40h) disposed proximate to each of the center portions (34) of the c-shaped conductive springs (30a-30g) and in electrical contact with the center portions (34a-34h) of the c-shaped conductive springs (30a-30g). Additionally a basic electronic element (40a) may be provided at in the closed electrical circuit on the commutator.

In the present figure, the basic electronic elements (40a-4h) are resistors of known value. Thus the resistance of the closed electrical circuit will change depending on how many additional parallel electrical circuits are connected to the closed electrical circuit. When a resistance meter is placed in the electrical circuit, the change in resistance can be measured when a printer ribbon (not shown) is loaded on the printer ribbon supply spindle (10) indicating how many segments have been added to the circuit.

Referring now to FIG. 3, the printer ribbon supply spindle (10) of FIG. 1 is shown with a printer ribbon (16) loaded on the printer ribbon supply spindle (10). In the Figure, the printer ribbon (16) covers and engages the commutator (20) and three segments (14a-14d), compressing c-shaped conductive springs (30a-30c). Thus three additional parallel electrical circuits are added to the closed electrical circuit consisting of the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20). The c-shaped conductive springs (30d-30g) remain uncompressed. The path of electrical current (29) is shown passing through the connected electrical circuits.

Referring now to FIG. 4, in another exemplary embodiment, the printer ribbon supply (11) is similar to that of FIGS. 1 and 3, except that the basic electronic element (42a-42h) is a dielectric material.

In the present embodiment, the center portions of the c-shaped conductive springs (30a-30g) are comprised of two conductive plates (36a and 36b). The dielectric material (42a-42h) lies between the two conductive plates (36a and 36b). The two conductive plates (36a and 36b) come in contact with the dielectric material (42a-42h) when the c-shaped conductive springs (30a-30g) are compressed.

Referring now to FIG. 5, the printer ribbon supply spindle (11) of FIG. 4 is shown with a printer ribbon (16) loaded on the printer ribbon supply spindle (11). In the Figure, the printer ribbon (16) covers and engages the commutator (20) and three segments (14a-14d), compressing c-shaped conductive springs (30a-30c). Thus three additional parallel electrical circuits are added to the closed electrical circuit consisting of the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20). The c-shaped conductive springs (30d-30g) remain uncompressed. The path of electrical current (29) is shown passing through the connected electrical circuits. When a capacitance meter is placed in the electrical circuit, the change in capacitance can be measured when a printer ribbon (16) is loaded on the printer ribbon supply spindle (11) indicating how many segments have been added to the circuit.

In another exemplary embodiment, depicted in FIG. 6, a system (60) for determining the width of a ribbon roll mounted on a printer ribbon spindle is provided. The Figure is particularly directed to the electrical and the communicative links in the system (60) and thus some of the particular components, as illustrated in FIGS. 1-5 hereinbefore are not shown. For example, the printer ribbon supply spindle has a base and multiple segments. The first of the multiple segments are contiguous to the base. Each subsequent segment of the multiple segments is contiguous to the previous segment of the multiple segments. Thus the segments and the printer ribbon spindle assembly themselves are not shown. As in the exemplary embodiments described hereinbefore, the printer ribbon supply spindle comprises a commutator (20) disposed circumferentially on the first segment of the ribbon spindle. Also provided are two carbon brushes (22a and 22b). The carbon brushes (22a and 22b) are disposed generally on either side of the commutator (20) and are connected to a voltage source (24). The carbon brushes are in electrical contact with the commutator (20). Thus, the voltage source (24), the carbon brushes (22a and 22b), and the commutator (20) form a closed electrical circuit.

C-shaped conductive springs (30a-30e) are disposed over each of the multiple segments. The c-shaped conductive springs (30a-30e) each has two ends and a center portion as described hereinbefore. The c-shaped conductive springs (30a-30e) are in an uncompressed state when no printer ribbon is loaded over c-shaped conductive springs (30a-30e). When a printer ribbon is loaded over the c-shaped conductive springs c-shaped conductive springs (30a-30e), the c-shaped conductive springs c-shaped conductive springs (30a-30e) compress.

The c-shaped conductive spring (30a) over the second of the multiple segments has a length such that when the c-shaped conductive spring (30a) is in the compressed state, the two ends of the c-shaped conductive spring (30a) make electrical contact with the commutator (20) completing a first additional electrical circuit in parallel with the closed electrical circuit. In the present Figure, the c-shaped conductive spring (30a) is in a compressed state.

The c-shaped conductive springs (30b-30e) over subsequent segments of the multiple segments have lengths such that when the c-shaped conductive springs 30b-30e) are in the compressed state, the two ends of the c-shaped conductive springs make electrical contact with the c-shaped conductive spring of the previous segment, completing additional electrical circuits in parallel with the closed electrical circuit. In the present Figure, c-shaped constructive springs (30b-30c) are in a compressed state and conductive springs (30d-30e) are in an uncompressed state. This condition of the conductive springs (30a-30c) signifies that a printer ribbon that has a length of four segments is loaded on the printer ribbon spindle.

The system (60) further comprises a basic electronic element (40) disposed proximate to each of the center portions of the c-shaped conductive springs (30a-30e) and in electrical contact with the center portion of the c-shaped conductive springs (30a-30e). The basic electronic elements (40) are included in the additional electrical circuits in parallel with the closed electrical circuit when the c-shaped conductive springs (30a-30e) are compressed.

The system (60) further comprises a meter (28) in the closed electrical circuit. The meter (28) is sensitive to the electrical properties of the basic electronic element (40) such that the reading on the meter (28) indicates how many additional parallel circuits are completed.

The system further comprises a processor (50) communicatively linked to the meter (28). The processor is configured to determine the width of the ribbon roll loaded on the printer ribbon supply spindle based upon the reading on the meter (28). The processor is further configured to implement printer functions (52) based upon the reading on the meter (28). The printer functions (52) include torque requirements of the printer.

In a further exemplary embodiment, depicted in FIG. 6, the processor (50) is configured to send information on the width of the ribbon roll loaded on the printer ribbon supply spindle to a display (534) on the printer.

The basic electronic elements (40) may be resistors or dielectric material. If the basic electronic element (40) is a resister, then the meter (28) is an ohm-meter and reads the resistance of the completed circuits. If the basic electronic elements (40) are of a dielectric material, then the meter (28) reads capacitance changes in the circuits completed.

Referring now to FIG. 7, the present invention embraces a method (200) for determining a width of a printer ribbon loaded on a ribbon spindle having multiple segments. The method (200) is comprised of the steps of: (210) providing, on a base segment of the ribbon spindle, a commutator electrically in contact with two carbon brushes disposed on either side of the commutator; (220) forming a closed electrical circuit by connecting the two carbon brushes to a voltage source; (230) providing compressible conductive elements on each of the multiple segments, the compressible conductive elements being in electrical contact with each other and with the closed electrical circuit, thus forming additional completed parallel electrical circuits with the closed electrical circuit based upon the compressible conductive elements being compressed; (240) loading the printer ribbon on the ribbon spindle; (250) compressing at least one of the compressible conductive elements under the printer ribbon; (260) measuring a change in electrical properties of the closed electrical circuit due to the additional completed parallel electrical circuits; (270) determining, based upon the measuring step, how many compressible conductive elements are compressed under the loaded printer ribbon; and (280) determining the printer ribbon width from the determination of the number of compressible conductive elements being compressed under the loaded printer ribbon.

The method hereinabove described is particularly suitable to be used in conjunction with the system shown in FIG. 6.

In an exemplary embodiment, the method (200) may further comprised the step of (290) providing the compressible conductive elements with a basic electronic element. The change in electrical properties measured in the (260) measuring step are due to the basic electronic elements included in the completed additional parallel circuits formed by the (250) compressing step. In an exemplary embodiment, the basic electronic element is a resistor. The (260) measuring step measures a change in resistance.

In another exemplary embodiment, the basic electronic element is a dielectric material. The (260) measuring step measures a change in capacitance.

In another exemplary embodiment, the method (200) further includes the step of (300) displaying the ribbon width determined in the second (280) determining step on a printer display.

In another exemplary embodiment, the method (200) further includes the step of (310) implementing printer functions based upon the ribbon width determined in the second (280) determining step. The (310) implementing step is accomplished with a processor. The printer functions include torque requirements for the printer ribbon.

In the method (200) the (260) measuring step is accomplished with an electrical meter sensitive to the electrical properties of the basic electronic element.

Referring now to FIG. 8, the present invention embraces a method (500) for determining a width of a printer media loaded on a spindle having multiple segments. The method (500) is comprised of the steps of: (510) loading a printer media on a spindle; (520) providing, on a base segment of a spindle, a commutator electrically in contact with two brushes disposed on either side of the commutator; (530) forming a closed electrical circuit by connecting the two brushes to a voltage source; (540) providing compressible conductive elements on each of the multiple segments on the spindle; (550) compressing one or more of the compressible conductive elements under the printer media; (560) measuring a change in electrical properties of the closed electrical circuit due to the additional completed parallel electrical circuits; (570) determining, based upon the measured change, how many compressible conductive elements are compressed under the loaded printer media; and (580) determining a printer media width from the determination of the number of compressible conductive elements being compressed under the loaded printer media. Referring to step (550), the compressible conductive elements, when compressed, are in electrical contact with each other and with the closed electrical circuit. Thus the compressed conductive elements form additional completed parallel electrical circuits with the closed electrical circuit.

The media loaded on the printer spindle may be a conventional printer ribbon, labels, receipts, a thermal transfer ribbon, and the like.

The method (500) preferably also includes the step (590) of providing the compressible conductive elements with a basic electronic element. The change in electrical properties measured in the measuring step (560) is due to the basic electronic elements included in the completed additional parallel circuits formed by the compressing step (550).

The basic electronic element may be a resistor. The measuring step (560) measures a change in resistance when the basic electronic element is a resister.

Alternatively, the basic electronic element may be a dielectric material. In the present case, the measuring step (560) measures a change in capacitance.

The method (500) may also include the step of (600) displaying the media width determined in the second determining step (580) on a display. The display may be on the printer or on a display communicatively linked to the printer.

The method (500) may also include a step (610) of implementing printer functions based upon the media width determined in the second determining step (580). The printer functions may advantageously include torque requirements. For example, the printer may be provided with a processor to accomplish the second determining step (580), the displaying step (600), and the implementing step (610).

The measuring step (560) may be advantageously accomplished with an electrical meter sensitive to the electrical properties of the basic electronic element. That is, a resistance meter or capacitance meter, depending on the basic electronic element.

The method (500) hereinabove described and depicted in FIG. 8 is particularly suitable to be used in conjunction with the system shown in FIG. 6 and the printer spindle assembly shown in FIGS. 1-5.

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

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

Claims

1. A printer spindle assembly, comprising: multiple segments, the first segment of the multiple segments being adjacent to a base, each subsequent segment of the multiple segments being adjacent to the previous segment of the multiple segments;a commutator, the commutator being disposed circumferentially on the first segment of the spindle;at least two brushes, the brushes being connected to a voltage source, disposed generally on either side of the commutator, and in electrical contact with the commutator, wherein the voltage source, the brushes, and the commutator form a closed electrical circuit;a c-shaped conductive spring disposed on each of the multiple segments;wherein the c-shaped conductive spring has two ends and a center portion;wherein the c-shaped conductive springs are in an uncompressed state in the absence of a printer ribbon over the one or more c-shaped conductive springs; andwherein the c-shaped conductive springs are in a compressed state in the presence of a printer ribbon positioned over the one or more c-shaped conductive springs.

2. The printer spindle assembly of claim 1, wherein the c-shaped conductive springs are metallic.

3. The printer spindle assembly of claim 1, wherein the c-shaped conductive spring on each segment of the multiple segments has a length such that when the c-shaped conductive spring is in the compressed state, the two ends of the c-shaped conductive spring make electrical contact with the commutator or the c-shaped conductive spring of a previous segment completing an additional electrical circuit in parallel with the closed electrical circuit.

4. The printer spindle assembly of claim 3 wherein a basic electronic element is disposed proximate to the center portions of each of the c-shaped conductive springs and in electrical contact with the center portion of the c-shaped conductive springs.

5. The printer spindle assembly of claim 4, wherein the basic electronic element is a resistor.

6. The printer spindle assembly of claim 4, wherein the basic electronic element is a dielectric material.

7. The printer spindle assembly of claim 6, wherein the center portion of the c-shaped conductive springs is comprised of two conductive plates and a dielectric material; the conductive plates being on either side of the dielectric material; the conductive plates coming in contact with the dielectric material based upon the c-shaped conductive springs being compressed.

8. The printer spindle assembly of claim 4, wherein each additional circuit includes the basic electronic element.

9. The printer spindle of claim 4, wherein the basic electronic element is a resistor; the printer spindle assembly further comprising a meter, the meter being connected to the closed electrical circuit; and wherein the meter reads the resistance of the completed circuits.

10. The printer spindle of claim 4, wherein the basic electronic element is a dielectric material; the printer spindle assembly further comprising a meter, the meter being connected to the closed electrical circuit; and wherein the meter reads capacitance changes in the circuits completed.

11. The printer spindle assembly of claim 3, further comprising a meter, the meter connected to the closed electrical circuit, such that the reading on the meter indicates how many additional parallel circuits are completed.

12. The printer spindle assembly of claim 11, further comprising a processor communicatively linked to the meter, the processor being configured to determine a width of a ribbon roll loaded on the printer spindle based upon a reading on the meter and to implement printer functions based upon the reading on the meter.

13. The printer spindle of claim 8, wherein the processor is further configured to send information on the width of the ribbon roll loaded on the spindle to a display.

14. The printer spindle of claim 8, wherein the printer functions include torque requirements of the printer.

15. A method, comprising: loading a printer media on a spindle;providing, on a base segment of a spindle, a commutator electrically in contact with two brushes disposed on either side of the commutator;forming a closed electrical circuit by connecting the two brushes to a voltage source;providing compressible conductive elements on each of multiple segments on the spindle;compressing one or more of the compressible conductive elements under the printer media, the compressible conductive elements when compressed being in electrical contact with each other and with the closed electrical circuit, forming additional completed parallel electrical circuits with the closed electrical circuit;measuring a change in electrical properties of the closed electrical circuit due to the additional completed parallel electrical circuits;determining, based upon the measured change, how many compressible conductive elements are compressed under the loaded printer media; anddetermining a printer media width from the determination of the number of compressible conductive elements being compressed under the loaded printer media.

16. The method of claim 15, wherein the media is selected from a ribbon, a label, a receipt, and a thermal transfer ribbon.

17. The method of claim 16, wherein the measuring step is accomplished with an electrical meter sensitive to the electrical properties of the basic electronic element.

18. The method of claim 15, further comprising the step of providing the compressible conductive elements with a basic electronic element.

19. The method of claim 18, wherein the basic electronic element is a dielectric material; and the measuring step measures a change in capacitance.

20. The method of claim 18, wherein the change in electrical properties measured in the measuring step are due to the basic electronic elements included in the completed additional parallel circuits formed by the compressing step.

21. The method of claim 18, wherein the basic electronic element is a resistor.

22. The method of claim 21, wherein the measuring step measures a change in resistance.

23. The method of claim 15, further comprising the step of displaying the media width determined in the second determining step on a display.

24. The method of claim 15, further comprising the step of implementing printer functions based upon the media width determined in the second determining step.

25. The method of claim 24, wherein the printer functions include torque requirements.