Media feeding apparatus
A media feeding assembly capable of feeding media from a media source including a rotatable connecting shaft and a pick roller. Driving of the shaft may provide a driving and a normal force on the pick roller towards a media source.
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The present invention relates to a media feeding apparatus, and more particularly, to a shaft driven pick mechanism for use within an imaging apparatus that may supply a driving and normal force to pick media from a media tray.
BACKGROUND OF THE INVENTIONAn image forming apparatus, such as an electrophotographic or inkjet printer, or even a duplicating apparatus, may include a media sheet supply system having a sheet feed assembly and a supply tray which may hold a plurality of media sheets, such as paper. The media sheets may be held in the supply tray until a print job is requested, and ideally are transported one by one within the apparatus for printing.
Such devices may utilize rollers to pick the media which rollers may commonly be sourced from, e.g., elastomeric type materials. Elastomeric materials in turn provide a useful surface to frictionally engage the media so that the media may be more efficiently conveyed from the media source to a selected media pathway within the image forming apparatus. Accordingly, it may be desirable to initially include an elastomeric material that maintains a relatively high coefficient of friction (COF) between the roller and media sheet. Over time, and depending upon the type of material utilized in the roller, surface finish, and cleaning chemicals utilized to clean the roller, it is common to see a reduction in the COF along with a reduction in media picking performance.
SUMMARY OF THE INVENTIONIn one exemplary embodiment the present invention relates to a media feeding assembly capable of feeding media from a media source. The assembly may include a rotatable shaft and a pick device wherein driving of the shaft provides a normal force on the pick device towards a media source. In another exemplary embodiment the present invention again relates to a media feeding assembly capable of feeding media from a media source. The assembly may include a driven gear and a drive gear. Such gears may then be engaged with a pair of gears on either end of a connecting shaft having a length such that the number of gear meshes is two. The system efficiency of the assembly may then remain substantially constant and independent of connecting shaft length.
BRIEF DESCRIPTION OF THE DRAWINGS
The feeding assembly 10 may include a bevel drive gear 12 and a bevel driven gear 14. A connecting shaft 16 may then be positioned between such gears and each end of the shaft may include gears 18a and 18b, such as bevel gears. The bevel gears may therefore be used to adjust the speed, e.g., between drive gear 12 and bevel gear 18a. The use of bevel gears 18a and 18b may also provide efficient transmission of power and motion between the angled intersection that may occur between bevel gears 18a and 18b with drive gear 12 and driven gear 14. As shown, bevel drive gear 12 in combination with bevel gear 18a may transmit power to the connecting shaft 16 that is perpendicular to the drive shaft 21 (see
The assembly 10 may also include a one-way clutch 30, axle shaft 33 and pick devices such as pick rollers 34. The rollers may be formed from a suitable elastomeric material and may therefore provide a surface for frictional engagement with media to be picked. The gears 18a and 18b may also be positioned in the upper portion of the housing 20 by journal bearings (not shown). In addition, with reference to
In addition, it is worth noting in
It may therefore be noted that this efficiency may now be relatively constant regardless of the length of shaft 16. This may therefore provide the benefit that designing a shaft 16 for an optimum length may only require a change in the housing components 20 and 22 and length of shaft 16. Accordingly, other components of the feeding assembly 10 may remain relatively similar. This may then allow for the feature that the feeding assembly 10 can serve as a standardized design which may reduce design, part and testing costs.
Such exemplary benefit (constant overall relative efficiency regardless of shaft length) may be highlighted by a comparison to the pick-arm 36 shown in
Accordingly, the gearing described herein provides the feature that the number of gear meshes is two together with the additional feature that the height of the arm relative to, e.g., a paper feeding tray (not shown) may be reduced. This may be illustrated in
The operation of the feeding assembly may now be described and may amount to the following sequence of steps, and attention is directed to
The drive shaft design herein may also provide a reduced amount of backlash between input and output rotation of the gears. This may then reduce pick time variation of the feeder system which may cause inter-page gap variation. Maintaining a consistent inter-page gap may permit a smaller gap size which may allow the printer to use a relatively lower process speed for the same page per minute throughput.
The foregoing description is provided to illustrate and explain the present invention. However, the description above should not be considered to limit the scope of the invention as set forth in the claim appended hereto.
Claims
1. A media feeding assembly capable of feeding media from a media source comprising a rotatable shaft and a pick device wherein driving of said shaft provides a normal force on said pick device towards said media source.
2. The media feeding assembly of claim 1 further including a housing.
3. The media feeding assembly of claim 1 wherein said rotatable shaft has two ends, one end engaged to an angled drive gear and one end engaged to an angled driven gear.
4. The media feeding assembly of claim 3 wherein said pick device comprises a pick roller that is engaged to said shaft via said angled driven gear.
5. The media feeding assembly of claim 4 including an axle positioned between said pick roller and angled driven gear.
6. The media feeding assembly of claim 3, including a housing mounted for rotation on a pivot about said angled drive gear wherein driving of said input shaft places a torque on said housing about said pivot to force said pick device towards said media source.
7. The media feeding assembly of claim 1 wherein said media source comprises a media tray including a rotatable member positioned to extend through an opening in a bottom of said tray and biased toward said opening to contact said pick device when said tray is empty to permit rotation of said pick device when said tray is empty.
8. The media feeding assembly of claim 3 wherein said angled drive gear or angled driven gear comprises a bevel gear.
9. The media feeding assembly of claim 3 wherein said angled drive gear or angled driven gear comprises a miter gear.
10. The media feeding assembly of claim 3 wherein said angled drive gear or angled driven gear comprises a helical gear.
11. The media feeding assembly of claim 3 wherein said angled drive gear or angled driven gear comprises a worm gear.
12. A media feeding assembly capable of feeding media from a media source comprising:
- a drive gear and a driven gear engaged with a pair of gears on either end of a connecting shaft having a length such that the number of gear meshes is two wherein the efficiency (Eff) of said assembly remains substantially constant and independent of said length of said connecting shaft after compensating for the gear ratio.
13. The media feeding assembly of claim 12 wherein the efficiency Eff of said assembly that remains substantially constant and independent of the length of said shaft after compensating for the gear ratio is calculated by the following equation: Eff=(Torqueout/Torquein)*[(N1*N3)/(N2*N4)] where N1 represents the number of teeth on the drive gear, N2 and N3 represent the number of teeth on said gears on the end of said connecting shaft and N4 represents the number of teeth on said driven gear.
14. The media feeding assembly of claim 12 wherein a pick device is engaged to said shaft.
15. The media feeding assembly of claim 14 including an axle positioned between said pick device and said driven gear.
16. The media feeding assembly of claim 12 wherein driving of said shaft provides a normal force on said pick device towards said media source.
17. The media feeding assembly of claim 12 wherein said media source comprises a media tray including a rotatable member positioned to extend through an opening in a bottom of said tray and biased toward said opening to contact said pick device when said tray is empty to permit rotation of said pick device when said tray is empty.
18. The media feeding assembly of claim 12 wherein said drive gear or driven gear comprises a bevel gear.
19. The media feeding assembly of claim 12 wherein said drive gear or driven gear comprises a miter gear.
20. The media feeding assembly of claim 12 wherein said drive gear or driven gear comprises a helical gear.
21. The media feeding assembly of claim 12 wherein said drive gear or driven gear comprises a worm gear.
Type: Application
Filed: Nov 9, 2005
Publication Date: May 10, 2007
Applicant:
Inventors: Michael Leemhuis (Nicholasville, KY), Daniel Westhoff (Georgetown, KY)
Application Number: 11/269,957
International Classification: B65H 3/06 (20060101);