Pinion roller drive for recording apparatus
a technology of pinion rollers and recording apparatuses, which is applied in the direction of thin material processing, article separation, printing, etc., can solve the problems of unsatisfactory solution, increased problem, and insufficient precision of conventional nip-fed media transport mechanisms for imaging applications, etc., to improve the mechanical resonance characteristics of the media transport apparatus, increase coupling stiffness, and increase mechanical coupling stiffness
Inactive Publication Date: 2008-02-14
BEDZYK MARK D +1
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Benefits of technology
The solution provides enhanced precision and uniformity in sheet media transport, improving mechanical resonance characteristics and reducing the need for replaceable components, while maintaining consistent velocity and minimizing flutter across the entire sheet.
Problems solved by technology
However, conventional nip-fed media transport mechanisms do not provide sufficient precision for imaging applications that require high resolution.
This problem becomes even more pronounced with full-sheet imaging, in which little or no margin is to be provided at the leading or trailing edges of a sheet.
Other problems related to compliance and tracking render the use of belt 22 as an unsatisfactory solution, particularly for media such as film that is generally thicker and more rigid than paper media or for sheet media that can vary in thickness.
Furthermore, belt 22 is a wear item that may require replacement and whose performance can be degraded by age, usage, and dust or dirt.
However, due to inherent coupling losses and mechanical tolerances, it can be difficult to obtain a coupling arrangement that provides highly efficient coupling with minimum flutter.
While this option offers some advantages, its implementation is complicated by the need to maintain efficient coupling under load and to compensate for unwanted mechanical effects caused by motor rotation.
Method used
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[0028] Reference is made to commonly-assigned copending U.S. patent application Ser. No. 10 / 977,841, filed Oct. 29, 2004, entitled SHEET RECORDING APPARATUS WITH DUAL NIP TRANSPORT by Hawver et al., the disclosure of which is incorporated herein.
[0029] The present description is directed in particular to elements forming part of, or cooperating more directly with, apparatus in accordance with the invention. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art.
[0030] Referring to FIG. 2, there is shown an image recording apparatus 58 for full sheet imaging, utilizing a dual nip media transport apparatus 30 according to an embodiment of the present invention. A sheet of recording medium 12, transported in direction Q, has a leading edge 32 and a trailing edge 34. Pressure rollers 18 and 28 cooperate with corresponding entrance and exit drive rollers 16 and 26 to form entrance nip 14 and exit nip 24, re...
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An apparatus for recording an image onto a sheet medium has an entrance drive roller paired with a corresponding entrance pressure roller to form an entrance nip for transporting the sheet medium into an image recording section. The image recording section has a write head for recording onto a portion of the sheet medium being transported between the entrance nip and exit nip. The exit nip is formed by a drive roller paired with a corresponding exit pressure roller for transporting the sheet medium out from the image recording section. A motor provides rotary motion to a pinion roller mechanically coupled to the entrance and exit drive rollers. A loading mechanism provides a loading force to nest the pinion roller into rotational contact against a portion of the entrance and exit drive rollers.
Description
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This is a Divisional of commonly-assigned copending U.S. patent application Ser. No. 11 / 035,307, filed Jan. 13, 2005, entitled PINION ROLLER DRIVE FOR RECORDING APPARTUS by Bedzyk et al., which issued on DATE as U.S. Pat. No. ______.FIELD OF THE INVENTION [0002] This invention generally relates to sheet media transport apparatus and more particularly relates to an image recording apparatus with a precision media transport apparatus that uses a dual nip system having precision drive roller motion provided by a pinion drive. BACKGROUND OF THE INVENTION [0003] Nip-fed sheet media transport systems using paired rollers are widely used in various printing applications. In a nip-fed system, a drive roller is pressed against a backing roller to form a nip and provides drive motion at the nip. A nip-fed transport can be engineered to perform with a suitable degree of accuracy in devices such as printers and office copiers. However, conventional...
Claims
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IPC IPC(8): B65H5/06
CPCB41J13/03B65H5/06B65H2801/12B65H2403/42B65H2404/143B65H2403/20
InventorBEDZYK, MARK D.HAWVER, JEFFERY R.
OwnerBEDZYK MARK D