FIELD OF THE INVENTION
The present invention relates to printing quality, and more particularly to a clutch bearing assembly for controlling media tension, and a method for reversing direction of printing media.
BACKGROUND
Generally speaking, high printing precision depends on constantly maintaining media in a printer flat and under tension. In most printers media is moved from a media supply with a platen roller. While media can be kept flat (and under tension) in a forward direction in such printers, reversing the direction is highly likely to cause media buckling, leading to incorrect media edge sensing and print registration. To overcome this issue, a mechanism capable of maintaining media tension in forward and reverse directions is needed.
Standard means of maintaining media tension often suffer some delay in response to reversing media feeding direction, which may result in media buckling. Such a delay may be introduced by the time needed to disengage the gears, or by having some parts (such as a platen roller) directly coupled to a motor, while having the other parts (such as a feed roller) coupled indirectly, and hence requiring more time to be activated. For example, U.S. Pat. No. 8,011,611 by Yoshimaru et al. discloses a recording medium transporting mechanism having a flange member attached on either side of a roll paper, support rollers, and a rewinding roller. U.S. Pat. No. 9,061,522 by Obenshain discloses a reversible printer assembly, which includes printing a label on an end-portion of a label roll and advancing the label roll such that the end-portion passes a cutter mechanism. The assembly has a drive clutch configured to engage with a take-up printer ribbon spool, and a reverse clutch having a return spring. U.S. Pat. No. 5,951,177 by Schanke et al. discloses a bidirectional handheld label printer with a labeling media and ink ribbon drive mechanism. A delay is introduced to pretension the ribbon prior to feeding labeling media and ribbon past the printhead. While these options may be acceptable for printing long labels, they do not leave enough time to compensate for buckling during short-label printing. Moreover, neither of these references discusses an option of using a pair of gears for controlling the media movement in forward and reverse directions, while each gear is paired with a clutch capable of functioning in both drive and slip modes. By avoiding gear disengagement and movement delay, such a combination can prevent damage of printer parts and media buckling.
Therefore, a need exists for a system capable of maintaining sufficient media tension in both forward and reverse media feeding directions. Such a system should be applicable to printing short and long labels, while avoiding mechanisms that may cause jamming and printer part damage.
SUMMARY
Accordingly, in one aspect, the present invention embraces a clutch bearing assembly configured to control media tension.
In an exemplary embodiment, a clutch bearing assembly includes a platen and feed roller assemblies configured to spin in a clockwise and counterclockwise directions; a compound gear assembly configured to be driven by a pulley assembly with a belt; a first shaft coupled to the feed roller assembly, and having a first gear configured to turn along with the first shaft, and a first clutch bearing configured to grip tightly when the first shaft is spinning in the clockwise direction, and to slip when the first shaft is spinning in the counterclockwise direction; and a second shaft having a second gear configured to turn with the second shaft, and a second clutch bearing configured to grip tightly when the second shaft is spinning in the clockwise direction, and to slip when the second shaft is spinning in the counterclockwise direction.
In another exemplary embodiment, a bidirectional media supporting system includes a first and second rollers configured to rotate to feed media in a forward and reverse feed modes; a first clutch bearing set, and a second clutch bearing set configured to engage with the first clutch bearing set; and a gear transmission assembly configured to transfer a driving force from the first roller to the second roller.
In another aspect, the present invention embraces a method for reversing direction of printing media. The method includes advancing media with a feeding roller assembly and a platen roller assembly, while maintaining a rotational speed of the platen roller assembly above that of the feeding roller assembly; receiving a signal to reverse the direction of advancing media; and adjusting operation of the feeding and platen roller assemblies by reversing a direction of rotation of a transmission, and by rotating the feeding and platen roller assemblies in an opposite direction, while maintaining the rotational speed of the platen roller assembly below that of the feeding roller assembly.
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. 1A graphically depicts a clutch bearing assembly, according to an embodiment.
FIG. 1B graphically depicts an enlarged portion of a clutch bearing assembly, according to an embodiment.
FIG. 2 schematically depicts a block diagram of a bidirectional media supporting system, according to an embodiment.
FIG. 3 schematically depicts a method for reversing direction of printing media, according to an embodiment.
DETAILED DESCRIPTION
The present invention embraces a clutch bearing assembly for controlling media tension, a bidirectional media supporting system, and a method for reversing direction of printing media.
FIGS. 1A and 1B show an exemplary embodiment of a clutch bearing assembly 100. The assembly 100 includes a platen roller assembly 102 having a longitudinal axis 104, a first end 106, and a second end 108. The platen roller assembly 102 is configured to spin in a clockwise direction and in a counterclockwise direction around the longitudinal axis 104. A pulley assembly 110 is operably coupled to the first end 106 of the platen roller assembly 102. The pulley assembly 110 is configured to spin along with the platen roller assembly 102 in the clockwise and counterclockwise direction. A compound gear assembly 112 is operably coupled to the pulley assembly 110 with a belt 114. The compound gear assembly 112 is configured to be driven by the pulley assembly 110 in the clockwise and counterclockwise direction. A feed roller assembly 116 is positioned parallel to the longitudinal axis 104 of the platen roller assembly 102, having a first end 118 and a second end 120. The feed roller assembly 116 is configured to spin along with the platen roller assembly 102 in the clockwise and counterclockwise direction. A first shaft 122 is operably coupled to the first end 118 of the feed roller assembly 116. The first shaft 122 includes a first gear 124 configured to be driven by the compound gear assembly 112, and to turn along with the first shaft 122. The first shaft 122 also includes a first clutch bearing 126 configured to grip tightly when the first shaft 122 is spinning in the clockwise direction, and to slip when the first shaft 122 is spinning in the counterclockwise direction. A second shaft 128 is operably coupled to the first end 118 of the feed roller assembly 116, and is positioned parallel to the first shaft 122. The second shaft 128 includes a second gear 130 engaged with the first clutch bearing 126, and configured to turn with the second shaft 128. The second shaft 128 also includes a second clutch bearing 132 engaged with the first gear 124, and configured to grip tightly and drive when the second shaft 128 is spinning in the clockwise direction, and to slip when the second shaft 128 is spinning in the counterclockwise direction.
In an embodiment, the platen roller assembly 102 can be configured to have a rotational speed exceeding a rotational speed of the feed roller assembly 116 during spinning in the clockwise direction. For example, the rotational speed of the platen roller assembly 102 can exceed the rotational speed of the feed roller assembly 116 by about 2-5%. The feed roller assembly 116 can be configured to have a rotational speed exceeding a rotational speed of the platen roller assembly 102 during spinning in the counterclockwise direction. For example, the rotational speed of the feed roller assembly 116 can exceed the rotational speed of the platen roller assembly 102 by about 2-5%.
The engagement between the second gear 130 and the first clutch bearing 126 can be provided by slots formed in a face of the second gear 130 and extensions formed on a face of the first clutch bearing 126, wherein such extensions extend into such slots (FIG. 1B). Additionally or alternatively, the engagement between the first gear 124 and the second clutch bearing 132 can be provided by slots formed in a face of the first gear 124 and extensions formed on a face of the second clutch bearing 132, wherein such extensions extend into such slots.
FIG. 2 shows an exemplary embodiment of a bidirectional media supporting system 200. The system 200 includes a first roller 202 configured to rotate to feed media 204 (not shown) in a forward feed mode and in a reverse feed mode. A second roller 206 is positioned parallel to the first roller 202, and is configured to rotate in the same direction as the first roller 202. A first clutch bearing set 208 is operably coupled to the second roller 206. A second clutch bearing set 210 is operably coupled to the second roller 206, and is configured to engage with the first clutch bearing set 208. A gear transmission assembly 212 is operably coupled to the first roller 202 with a belt pulley assembly 214 and to the second roller 206 with the first clutch bearing set 208. The gear transmission assembly 212 is configured to transfer a driving force from the first roller 202 to the second roller 206.
In an embodiment, the first clutch bearing set 208 can be configured to drive in the forward feed mode, rotating in the same direction as the first and second rollers 202 and 206, respectively. Additionally or alternatively, the second clutch bearing set 210 can be configured to drive in the reverse feed mode, rotating in the same direction as the first and second rollers 202 and 206, respectively.
The first clutch bearing set 208 can include a first shaft assembly, a first gear coaxial with the first shaft assembly and configured to rotate along with the first shaft assembly, and a first clutch coaxial with the first shaft assembly. The first clutch can include a one-way clutch.
The second clutch bearing set 210 can include a second shaft assembly, a second gear coaxial with the second shaft assembly and configured to rotate along with the second shaft assembly, and a second clutch coaxial with the second shaft assembly. The second clutch can include a one-way clutch.
Depending on an embodiment, the media 204 can include a long or/and a short label. Additionally, the supporting system 200 can be configured to operate as a label printer bidirectional media supporting system.
FIG. 3 shows a method 300 for reversing direction of printing media, according to an embodiment. At 302, media is advanced in a first direction, with a feeding roller assembly and a platen roller assembly, by rotating the feeding roller assembly and the platen roller assembly in the first direction and maintaining a rotational speed of the platen roller assembly above a rotational speed of the feeding roller assembly. At 304, a signal to reverse the first direction of advancing media is received. At 306, operation of the feeding roller assembly and the platen roller assembly is adjusted by reversing a direction of rotation of a transmission gear operably coupled to the feeding roller assembly and the platen roller assembly, and by rotating the feeding roller assembly and the platen roller assembly in a second direction opposite the first direction and maintaining the rotational speed of the platen roller assembly below the rotational speed of the feeding roller assembly.
In an embodiment, a difference in the rotational speed of the platen roller assembly and the feeding roller assembly can be about 2-5%. Additionally, reversing a direction of rotation of a transmission gear can occur instantaneously.
In an embodiment, the feeding roller assembly may include a feeding roller, one or more support rollers parallel to the feeding roller, a media spool and/or media spool support members, combinations thereof, and/or other mechanisms configured to advance media in forward and reverse directions. Similar options may be available for the platen roller assembly.
Device and method components are meant to show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein. In various embodiments, the sequence in which the elements of appear in exemplary embodiments disclosed herein may vary. Two or more method steps may be performed simultaneously or in a different order than the sequence in which the elements appear in the exemplary embodiments.
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.
Patent Application
20180237243
