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US Patent 5419644 - Print medium handling system including cockle springs to control pen-to-print medium spacing during printing
US Patent Issued on May 30, 1995
Estimated Patent Expiration Date:
February 28, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
February 28, 2014Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA printer mechanism to control pen-to-print medium spacing during printing is described. The preferred embodiment of the mechanism includes a printhead and an adjacent platen. The platen includes differentially yieldable structure adapted to resiliently support the print medium thereby to inhibit uncontrolled bending of the print medium during printing. The yieldable structure preferably extend along a line generally perpendicular to a direction of feed of the print medium. The platen may further include a transition region located adjacent the yieldable structure, the transition region adapted to facilitate smooth transition of the leading edge of the print medium onto the yieldable structure. | InventorsApplicationNo. 203113 filed on 02/28/1994US Classes:400/642, Including sheet guide (e.g., for sheet insertion, etc.)271/209, With means to bow sheets347/8, Of spacing between fluid ejector and receiving medium347/104, Physical handling400/578SHEET OR WEB (E.G., RECORD-MEDIUM FEEDING MECHANISM)Field of Search400/642, Including sheet guide (e.g., for sheet insertion, etc.)400/646, Sheet table at delivery side of platen400/648, PLATEN OR PLATEN-MOVING MECHANISM400/656, Bar (i.e., line size) platen400/611, For feeding web record-medium400/617, By friction-feed means (e.g., reciprocating finger or gripper or pinch roller, etc.)400/578, SHEET OR WEB (E.G., RECORD-MEDIUM FEEDING MECHANISM)400/624, For feeding sheet from stack or pack holder400/619, Including web guiding or aligning (e.g., laterally, relative to print-line, etc.)400/55, INCLUDING ADJUSTMENT FOR OPTIMUM PRINTING PLANE400/56, Responsive to thickness of record-medium400/59, By adjustment of carriage (e.g, carriage-guide rollers)346/134, RECORD RECEIVERS AND/OR DRIVING MEANS THEREFOR271/188, Means to bow sheets during delivery271/209With means to bow sheetsExaminersPrimary: Burr, Edgar S.Assistant: Nguyen, Anthony H. US Patent References3673960, 3915281, 3995730, Dot matrix impact printer having retractable platenIssued on: 12/07/1976 Inventor: Kwan , et al.4095686, Printer having swingable printing rings Issued on: 06/20/1978 Inventor: Okabe4537521, Paper feed mechanism with varying contact pressure Issued on: 08/27/1985 Inventor: Rekewitz , et al.4549826, Paper feed apparatus for typewriters or business machines having a paper levelling gap disposed in the paper guidance channel Issued on: 10/29/1985 Inventor: Stoeberl4560292, Printer comprising spring biased print head and roller platen Issued on: 12/24/1985 Inventor: Takahashi4642661, Printer with drive on swinging platform Issued on: 02/10/1987 Inventor: Dean, II4728963, Single sheet ink-jet printer with passive drying system Issued on: 03/01/1988 Inventor: Rasmussen , et al.4843338, Ink-set printhead-to-paper referencing system Issued on: 06/27/1989 Inventor: Rasmussen , et al.4853255, Process for controlling curl in coated papers Issued on: 08/01/1989 Inventor: Onishi , et al.5065169, Device to assure paper flatness and pen-to-paper spacing during printing Issued on: 11/12/1991 Inventor: Vincent, et al.5280897, Paper-resupplying device in image-forming apparatus Issued on: 01/25/1994 Inventor: Maekawa5291224Sheet feeding apparatus using pairs of spur rollers Issued on: 03/01/1994 Inventor: Asano, et al. International ClassB41J 013/10 |
