Printer roll feed mechanism

Abstract

A media feeding system comprises a driver configured to rotate a media roll in a first direction; a vacuum roller positioned in a media feed path and configured to rotate in the first direction; and a media end detecting sensor positioned in the media feed path, the media end detecting sensor being configured to detect a leading edge of the media; wherein the driver rotates the media roll in a second direction opposite the first direction in response to the sensor detecting the leading end of the media.

Description

FIELD OF THE INVENTION

The invention is generally related to a printer roll feed mechanism, and, more specifically, to a printer roll feed mechanism with a vacuum roller.

BACKGROUND

When loading roll media into a printer, conventional printers generally require a user to first place the media roll into the printer, and then manually feed a leading end of the media into a roll feed mechanism. This process is often frustrating to a user, because space within the printer is limited, making the manual task of feeding the media tedious. When a user is in a demanding and stressful position, such as a cashier in a busy checkout line, loading a roll of receipt media in a printer can increase the stress of the cashier if the receipt media is difficult to manually feed into the printer roll feed mechanism.

A printer that used an auto-feed mechanism that reduces or eliminates the need to manually feed the media into the roll feed mechanism would be beneficial to users.

SUMMARY

Accordingly, in one aspect, the present invention embraces a method for loading print media in a printer that includes rotating a print media roll in a first direction, rotating in the first direction a vacuum roller positioned in a media path, detecting a leading edge of the print media with a media end detecting sensor positioned in the media path, rotating the print media roll in a second direction in response to detecting the leading edge of the print media, and guiding the print media along the media path with the vacuum roller.

In an exemplary embodiment, the method includes rotating the print media roll with a driving roller configured to rotate in a first direction and a second direction.

In another exemplary embodiment, the first direction is opposite of the second direction.

In yet another exemplary embodiment, the first direction is clockwise.

In yet another exemplary embodiment, the second direction is counterclockwise.

In yet another exemplary embodiment, the vacuum roller is perforated and operatively connected to a vacuum source.

In yet another exemplary embodiment, the media end detecting sensor is positioned proximate to the vacuum roller.

In yet another exemplary embodiment, the print media is guided along a media path by a media guide positioned proximate to the vacuum roller.

In yet another exemplary embodiment, the print media is guided along a media path by a media guide positioned proximate to the vacuum roller and at least a portion of the guide is perforated.

In yet another exemplary embodiment, the method includes moving the print media along the media path towards pinch rollers, detecting the leading edge of the print media with a leading end detecting sensor positioned proximate to the pinch rollers, removing vacuum from the vacuum roller in response to detecting the leading edge of the print media, and guiding the print media forward with the pinch rollers.

In another aspect, the present invention embraces a media feeding system that includes a driver configured to rotate a media roll in a first direction, a vacuum roller positioned in a media feed path and configured to rotate in the first direction, and a media end detecting sensor positioned in the media feed path, the media end detecting sensor being configured to detect a leading edge of the media, wherein the driver rotates the media roll in a second direction opposite the first direction in response to the sensor detecting the leading end of the media.

In an exemplary embodiment, the driver comprises a driving roller configured to rotate in a first direction and a second direction.

In another exemplary embodiment, the vacuum roller is perforated and operatively connected to a vacuum source.

In yet another exemplary embodiment, the media end detecting sensor is positioned proximate to the vacuum roller.

In yet another exemplary embodiment, the media feeding system includes a media guide positioned proximate to the vacuum roller along a length of a media path.

In yet another exemplary embodiment, the media feeding system includes a media guide positioned proximate to the vacuum roller along a length of a media path and at least a portion of the media guide is perforated.

In yet another exemplary embodiment, the media feeding system includes pinch rollers positioned along the media feed path and a leading end detecting sensor located proximate to the pinch rollers, the sensor configured to detect the leading edge of the media, and vacuum is removed from the vacuum roller and the media is guided forward by the pinch rollers in response to the leading end detecting sensor detecting the leading end of the media.

In yet another aspect, the present invention embraces a printer that includes a housing, a printing mechanism positioned in the housing, and a media feeding mechanism positioned in the housing, which includes a vacuum roller positioned in a media path, the vacuum roller being configured to rotate in a first direction and push media along a media path, a media end detecting sensor positioned in the media path, a driver configured to rotate a media roll in a second direction in response to the media end detecting sensor detecting a leading end of the media, and a guide configured to guide media pushed by the vacuum roller along the media path.

In an exemplary embodiment, at least a portion of the guide is perforated.

In another exemplary embodiment, the printer includes pinch rollers positioned along the media path and a leading end detecting sensor positioned proximate to the pinch rollers, the leading end detecting sensor being configured to detect the leading end of the media and vacuum is removed from the vacuum roller in response to detecting the leading edge of the media and the media is guided forward by the pinch rollers.

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

The invention will now be described by way of example, with reference to the accompanying Figures, of which:

FIG. 1 is a schematic view of a printer prior to insertion of a roll of media;

FIG. 2 is a schematic view of the printer after insertion of a roll of media;

FIG. 3 is a schematic view of the printer where a leading edge of the media contacts a solid media guide;

FIG. 4 is a schematic view of the printer where the leading edge of the media contacts a perforated media guide and vacuum roller;

FIG. 5 is a schematic view of the printer where the leading edge of the media is detected by a media end detecting sensor;

FIG. 6 is a schematic view of the printer where the leading edge of the media is advanced through the solid media drive along a media feed path;

FIG. 7 is a schematic view of the printer where the media has been engaged by a pair of opposing pinch rollers;

FIG. 8 is a perspective view of the perforated and solid media guides, and the vacuum roller; and

FIG. 9 is a block diagram of a method for loading the media in the printer.

DETAILED DESCRIPTION

In the embodiments shown in FIGS. 1-7, a printer 1 comprises a housing, a printing mechanism 100, an automatic media feeding system 200, and a media feed path 4. Various embodiments of the present invention will be described in relation to a thermal transfer barcode printer. As used herein, the term “printer” refers to a device that prints text, barcodes, illustrations, etc. onto the print media (e.g., labels, tickets, plain paper, receipt paper, plastic transparencies, and the like). In the thermal transfer printer, an ink ribbon supplies the media (e.g., ink) that transfers onto the print media. However, the present invention may be equally applicable to other types and styles of printers that may benefit from using a media guide therein (e.g., a direct transfer barcode printer).

The housing (not labeled) can be any printer housing known to those of ordinary skill in the art. As generally shown in FIGS. 1-7, the housing comprises a media hanger assembly 2 onto which a roll of media 3 can be in positioned. The terms “media”, “media roll”, “roll of media”, etc., are understood to comprise labels, tickets, plain paper, plastic transparencies, print ribbon, and the like. In an embodiment, the housing comprises a media center biasing mechanism 5, which contacts installed media 3 to hold the media 3 centered on the media hanger assembly 2.

The printing mechanism 100 is any printing mechanism known to the skilled artisan.

The automatic media feeding system 200 comprises a media driver 210a, 210b, a vacuum roller 220, a media end detecting sensor 230, a media guide 240a,240b, pinch rollers 250a, 250b, and a leading end detecting sensor 260. In some embodiments, the printer does not include any media drivers. In some embodiments, the printer includes a powered media hanger assembly for rotating the media roll 3.

The media driver 210a is a driving roller that contacts a media roll 3 positioned in a printer 1 and rotates the media roll 3 in a first direction. The first direction can be either clockwise or counterclockwise. In an embodiment, the driving roller 210a is configured to rotate in the first direction and/or a second direction opposite the first direction, the second direction being either clockwise or counterclockwise. In the embodiment shown in FIGS. 1-7, the printer comprises a two or more driving rollers 210a, 210b. In another embodiment shown in FIGS. 1-7, a spring loaded free roller 210c contacts the media roll 3 and biases the media roll 3 against the driving rollers 210a, 210b.

A media roll detecting sensor 270 can be positioned in the housing proximate to the media hanger assembly 2 and detect a presence of a media roll 3 installed in the printer 1. In an embodiment, the media roll detecting sensor 270 is an infrared (IR) sensor, such as an IR-based photodiode sensor. In other embodiments, the media roll detecting sensor 270 is an imager-based sensor, or any other sensor known to the skilled artisan to detect a presence of media 3 in the printer 1.

In the embodiments shown in FIGS. 1-8, the vacuum roller 220 is generally cylindrical roller with a hollow vacuum transmitting interior. As shown more particularly in the embodiment of FIG. 8, a plurality of vacuum holes 220a are disposed on the surface of the vacuum roller 220, and each of the vacuum holes 220a is in operative communication with the vacuum transmitting interior such that a vacuum is created at each of the vacuum holes 220a. The vacuum roller 220 is configured to rotate in the first direction and/or the second direction. The vacuum transmitting interior of the vacuum roller 220 is operatively connected to a vacuum generator 221, such as a fan and plenum, or other vacuum generating mechanisms. The vacuum roller 220 is positioned in the media feed path 4.

The printer 1 can also comprise one or more motors (not shown) operatively connected to the driving rollers 210a, 210b and vacuum roller 220 for rotating the rollers in the first and second directions.

The media end detecting sensor 230 is positioned along the media feed path 4 proximate to the vacuum roller 220, the media end detecting sensor 230 being configured to detect a leading edge 3a of the media 3. In an embodiment, the media end detecting sensor 230 is an infrared (IR) sensor, such as an IR-based photodiode sensor. In other embodiments, the media end detecting sensor 230 is an imager-based sensor, or any other sensor known to the skilled artisan to detect a leading edge 3a of the media 3.

As shown in the embodiments of FIGS. 1-8, the media guide comprises a perforated media guide 240a on a first end and a pair of opposing solid media guides 240b on an opposite second end. For example, in FIG. 1, the pair of opposing solid media guides 240b is shown as two parallel solid lines, whereas the perforated media guide 240a is shown as a single dotted line. The space between the opposing solid media guides 240b forms a portion of the media path 4.

As shown in the embodiment of FIG. 8, the perforated media guide 240a comprises a plurality of vacuum holes 241. The vacuum holes 241 are in operative communication with a vacuum source, such as the vacuum generator 221, so that a vacuum is created at each of the vacuum holes 241. In other embodiments, the vacuum is generated by a vacuum generator that is separate from the vacuum generator 221.

The pinch rollers 250a, 250b are positioned proximate to the second end of the media guide 240a. In an embodiment, both pinch rollers 250a, 250b are operatively connected to a motor (not shown) for operatively rotating the pinch rollers 250a,250b in the first and second directions. In another embodiment, one of the pinch rollers, for example pinch roller 250a, is operatively connected to a motor for operatively rotating the pinch roller 250a, and the other pinch roller is a free rolling roller. In a further embodiment, one of the pinch rollers, for example pinch roller 250b, is spring loaded, and is biased towards the other pinch roller.

The leading end detecting sensor 260 is positioned proximate to the pinch rollers 250a, 250b and between the pinch rollers 250a, 250b and the solid media guides 240b along the media path 4. The leading end detecting sensor 260 detects the leading edge 3a of the media 3 as the leading edge 3a nears the pinch rollers 250a,250b. In an embodiment, the leading end detecting sensor 260 is an infrared (IR) sensor, such as an IR-based photodiode sensor. In other embodiments, the leading end detecting sensor 260 is an imager-based sensor, or any other sensor known to the skilled artisan to detect a leading edge 3a of the media 3.

The printer 1 may also comprise a power source and a moveable cover (removed in the figures for purposes of illustration) for accessing the printing mechanism, an automatic media feeding system, media feed path, media hanger assembly, etc. contained within the housing. The printer 1 may further comprise a central processing unit (CPU) (not shown). As known in the art, the central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the methods described herein.

The printer 1 can also comprise a user interface (not shown) which can include, but is not limited to, a display for displaying information and function buttons that may be configured to perform various typical printing functions (e.g., cancel print job, advance print media, and the like) or be programmable for the execution of macros containing preset printing parameters for a particular type of print media. The display may include a touch screen keypad for entering data or the keypad may be separate. Additionally, the user interface may be operationally/communicatively coupled to the CPU (not shown) for controlling the operation of the printer, in addition to other functions. The user interface may be supplemented by or replaced by other forms of data entry or printer control such as a separate data entry and control module linked wirelessly or by a data cable operationally coupled to a computer, a router, or the like.

In the embodiment shown in FIG. 1, the printer 1 is shown without a media roll 3 positioned in the housing on the media hanger 2.

In the embodiment shown in FIG. 2, the printer 1 has a media roll 3 positioned in the printer housing and placed on the media hanger 2. The spring loaded free roller 210c adjusts a position in the housing to contact the media roll 3 and biases the media roll 3 against the driving rollers 210a, 210b. The media center biasing mechanism 5 also adjust a position in the housing to contact the installed media roll 3 to hold the media 3 centered on the media hanger assembly 2. The media roll detecting sensor 270 detects the presence of the installed media roll 3, and the driving rollers 210a, 210b responsively rotate in the second direction, which is shown in FIG. 2 as being counterclockwise. However, the skilled artisan would understand that in other embodiments, the second direction may be clockwise. As the driving rollers 210a, 210b rotate in the second direction, the media roll 3 is rotated in the first direction. Additionally, the vacuum roller 220 also begins rotating in the first direction, and a vacuum is applied to both the vacuum roller 220 and the perforated media guide 240a.

In the embodiment of FIG. 3, as the media roll 3 rotates in the first direction, the leading edge 3a contacts the media guide 240b, with the media 3 contacting the vacuum roller 220.

In the embodiment of FIGS. 4 and 5, as the media roll 3 continues to rotate in the first direction, the leading edge 3a is vacuum drawn towards the vacuum roller 220, and ultimately towards the perforated media guide 240a. Upon contact of the leading edge 3a with the perforated media guide 240a, the media end detecting sensor 230 detects the leading edge 3a.

As shown in the embodiment of FIG. 6, in response to the media end detecting sensor 230 detecting the leading edge 3a, the driving rollers 210a, 210b reverse rotation, and begin rotating in the first direction, which in turn, reverses the rotation of the media roll 3 to rotate in the second direction. By reversing the rotation of the media roll 3 to rotate in the second direction, the media roll 3 begins to unwind, pushing the lead edge 3a along the media feed path 4. The vacuum from perforated media guide 240a and the vacuum roller 220 holds the unwinding media 3 in the media feed path 4. The combination of the driving rollers 210a,210b and the vacuum roller 220 advances the leading edge 3a of the media 3 from the first end of the media guide towards the solid media guides 240b on the opposite second end of the media guide.

In the embodiment of FIG. 7, the leading edge 3a of the media 3 has advanced along the media feed path 4, and has engaged the pinch rollers 250a,250b. The pinch rollers 250a,250b will then advance the leading edge 3a into the printing mechanism 100. Prior to engaging the pinch rollers 250a,250b, the leading end detecting sensor 260 detects the presence of the leading edge 3a prior to the leading edge 3a contacting the pinch rollers 250a,250b. In an embodiment, responsive to detecting the leading edge 3a, the pinch rollers 250a,250b begin rotating prior to arrival of the leading edge 3a.

In an embodiment, once the pinch rollers 250a,250b have engaged the media 3, the vacuum source is removed from the perforated media guide 240a and the vacuum roller 220. Optionally, the vacuum roller 220 and the driving rollers 210a, 210b are also disengaged from the motors, and allowed to free spin. Thus, the pinch rollers 250a, 250b can control media 3 advancement through the printing mechanism 100.

FIG. 9 describes a method 300 for loading print media 3 in the printer 1. After loading the print media roll 3 into the printer 1, the print media roll 3 is rotated in a first direction at block 305. As the print media roll 3 is rotated in the first direction, the vacuum roller 220 is rotated in the first direction at block 310. At block 315, the leading edge 3a of the print media 3 is detected by the media end detecting sensor 230. In response to detecting the leading edge 3a of the print media 3, the print media roll 3 is rotated in the second direction at block 320. At block 325, the print media 3 is guided along the media path 4 with the vacuum roller 220. At block 330 the print media 3 is guided along a media path 4 by the media guides 240a,240b,240c positioned proximate to the vacuum roller 220. The print media 3 is moved along the media path 4 towards pinch rollers 250a,250b at block 330. The leading edge 3a of the print media 3 is detected with a leading end detecting sensor 260 positioned proximate to the pinch rollers 250a,250b at block 335. At block 340, the vacuum is removed from the vacuum roller 220 in response to detecting the leading edge 3a of the print media 3. At block 345, the print media 3 is guided forward towards the printing mechanism 100 by the pinch rollers 250a,250b.

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

Claims

1. A method for loading print media in a printer, the method comprising: rotating a print media roll having a leading edge in a first direction;rotating in the first direction a vacuum roller positioned prior to a media guide in a media path;detecting the leading edge of the print media with a media end detecting sensor positioned in the media path prior to the leading edge being received by the media guide;rotating the print media roll in a second direction in response to detecting the leading edge of the print media prior to the leading edge being received by the media guide; andguiding the print media along the media path with the vacuum roller.

2. The method of claim 1, wherein the print media roll is rotated by a driving roller configured to rotate in a first direction and a second direction.

3. The method of claim 1, wherein the first direction is opposite of the second direction.

4. The method of claim 1, wherein the first direction is clockwise.

5. The method of claim 1, wherein the second direction is counterclockwise.

6. The method of claim 1, wherein the vacuum roller is perforated and operatively connected to a vacuum source.

7. The method of claim 1, wherein the media end detecting sensor is positioned proximate to the vacuum roller and the print media, and prior to the media guide.

8. The method of claim 1, wherein the print media is guided along a media path by the media guide positioned proximate to the vacuum roller.

9. The method of claim 1, wherein at least a portion of the media guide is perforated, wherein another portion of the media guide corresponds to solid media guides.

10. The method of claim 1, comprising: moving the print media along the media path towards pinch rollers;detecting the leading edge of the print media with a leading end detecting sensor positioned proximate to the pinch rollers;removing vacuum from the vacuum roller in response to detecting the leading edge of the print media; andguiding the print media forward with the pinch rollers.

11. A media feeding system, comprising: a driver configured to rotate a media roll in a first direction;a vacuum roller positioned before a media guide in a media feed path and configured to rotate in the first direction; anda media end detecting sensor positioned before the media guide and after the vacuum roller in the media feed path, the media end detecting sensor being configured to detect a leading edge of the media; wherein the driver rotates the media roll in a second direction opposite the first direction in response to the sensor detecting the leading end of the media prior to being received by the media guide.

12. The media feeding system of claim 11, wherein the driver comprises a driving roller configured to rotate in a first direction and a second direction.

13. The media feeding system of claim 11, wherein the vacuum roller is perforated and operatively connected to a vacuum source.

14. The media feeding system of claim 11, wherein the media end detecting sensor is positioned proximate to the vacuum roller and the print media, and before the media guide.

15. The media feeding system of claim 11, comprising the media guide positioned proximate to the vacuum roller along a length of a media path.

16. The media feeding system of claim 15, wherein a first portion of the media guide is perforated and a second portion of the media guide is a solid media guide, wherein the first portion of the media guide comprises a plurality of vacuum holes which are in operative communication with a vacuum source.

17. The media feeding system of claim 11, comprising: pinch rollers positioned along the media feed path; anda leading end detecting sensor located proximate to the pinch rollers, the sensor configured to detect the leading edge of the media; wherein vacuum is removed from the vacuum roller and the media is guided forward by the pinch rollers in response to the leading end detecting sensor detecting the leading end of the media.

18. A printer, comprising: a housing;a printing mechanism positioned in the housing; anda media feeding mechanism positioned in the housing, comprising: a vacuum roller positioned in a media path prior to a media guide, the vacuum roller being configured to rotate in a first direction and push media along a media path,a media end detecting sensor positioned in the media path prior to the media guide,a driver configured to rotate a media roll in a second direction in response to the media end detecting sensor detecting a leading end of the media prior to being received by the media guide, anda first portion of the media guide configured to guide media pushed by the vacuum roller along the media path.

19. The printer of claim 18, wherein first portion of the media guide is perforated media guide, wherein a second portion of the media guide is a solid media guide.

20. The printer of claim 18, comprising: pinch rollers positioned along the media path; anda leading end detecting sensor positioned proximate to the pinch rollers, the leading end detecting sensor being configured to detect the leading end of the media; wherein vacuum is removed from the vacuum roller in response to detecting the leading edge of the media and the media is guided forward by the pinch rollers.