Typewriting machines – Typing by other than type-face or type-die – Thermal
Reexamination Certificate
2003-11-03
2004-08-17
Hirshfeld, Andrew H. (Department: 2854)
Typewriting machines
Typing by other than type-face or type-die
Thermal
C101S071000, C101S091000, C400S061000, C400S070000, C358S001100, C358S001160, C358S001180
Reexamination Certificate
active
06776544
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to an arrangement for printing a print image, such as a postage meter machine, wherein different regions of the print image can be printed with respectively different resolutions.
2. Description of the Prior Art
U.S. Pat. No. 4,746,234 discloses a postage meter machine with a thermal transfer printer that allows the print image information to be easily changed. Semi-permanent and variable print image information is electronically stored as print data in a memory and read out into a thermal transfer-printing device for printing. This solution was employed in the commercial postage meter machine T1000 offered by Francotyp-Postalia AG & Co. KG and was the first time that an advertising imprint could be changed by pressing a button.
A method and an arrangement for internal cost center printing are available for department-by-department accounting of the value of postage fees consumed with the postage meter machine T1000, with a print image that is rotated by 90° or 270° being generated by means of a specific print controller (European Application 580 274, U.S. Pat. No. 5,790,768).
Printing business cards, fee stamps and court costs stamps is also possible with the T1000 machine, i.e. generating print images that differ considerably in structure and content from a franking imprint.
A franking imprint usually comprises a postal value stamp, a postmark image with the mail-receiving location and date as well as the aforementioned advertising image and is generated in the aforementioned sequence with, for example, the postage meter machine T1000 by means of printing print columns arranged perpendicular to the transport direction of the item being franked. The overall print column is imprinted by a single thermal transfer printhead. The machine can thus achieve a maximum throughput of franking matter of 2200 letters/hour with a print resolution of 240 dots per 30 mm, i.e. 203 dpi, but the manual feed of franking items limits the throughput of franking items that can be achieved in practice.
European Application 578 042 (corresponding to U.S. Pat. No. 5,608,636) discloses a method for controlling the column-by-column printing of a postage imprint, wherein encoded image information are converted before the printing event into binary signals for driving print elements, whereby the converted, variable and invariable image cannot be compiled until during printing. The decoding of the variable print data and offering of the print data for a complete column in a register ensue by means of a microprocessor. Since the data for the next print column must be edited in the time between two print columns, the computing time of the microprocessor must be in conformity with the proportion of variable print data, the level of franking items, throughput of franking items, and the print resolution. This increases the busload and limits the possibility of printing a franking imprint onto franking items faster. The franking imprint contains postal information including the postage fee data for delivering the letter. Modem postage meter machines enable a security imprint, i.e. an imprint of a specific marking in addition to the aforementioned information. For example, the aforementioned information is used to generate a message authentication code or a signature and a character string or a bar code as a marking. When a security imprint is printed with such a marking, this enables a review of the authenticity of the security imprint, for example in the post office or on the premises of a private carrier (U.S. Pat. Nos. 5,953,426 and 6,041,704).
In some countries, due to the development of postal requirements for a security imprint, the amount of variable print image data that must be modified between two imprints of different franking stamps is very high. For Canada, for example, a data matrix code of 48×48 picture elements must be generated and printed for every individual franking imprint.
An ink jet printhead can be composed of a number of modules according to the “non-interlaced” principle when the spacings between the nozzles are too large and the number of nozzles of a module are inadequate for printing a printing width of 1 inch (=25.4 mm) with one module given a resolution of approximately 200 dpi. In the ink printhead of the commercial postage meter machine JetMail®, for example, three modules are arranged offset from one another in the column direction of the print image. Each module has only one row of nozzles with 64 nozzles and the modules are arranged slanted to such an extent relative to the print column so that each nozzle row describes an acute angle relative to the transport direction of the materials to be franked. The individual nozzles of each module therefore do not print along a print image column but print along a diagonal that intersects the columns of the print image. As a consequence, pixel offset errors accumulate when the transport velocity is not correctly acquired. Despite acquiring the movement of the franking matter in the transport direction with a high-quality encoder, it is difficult to print a line straight in the direction of the print image column. The individual modules and their offset from one another, moreover exhibit tolerances that arise in the manufacture of the modules. Below a size that is spaced one print image column from the next, a print pulse is supplied with different delay for each module.
A method and an arrangement for tolerance compensation are described in European Applications 921 008 and 921 009, wherein individual printhead data are stored in a non-volatile memory of the printhead and taken into consideration in the print pulse delay. When the pixel offset error exceeds the size by which a print column is spaced from the next, then the binary pixel data in the pixel memory must be changed.
A solution for print image generation for the JetMail® disclosed by U.S. Pat. No. 5,707,158 and European Application 762 334 describes how the data describing a complete print image are generated and stored before the printing, and is based on a control datafile for field-by-field generation of the print image in a pixel memory before the printing. The print image is defined in image sub-datafiles of the control datafile and is stored as pattern in pixel datafiles. So that the printer device can directly access the pixel data, binary pixel data are not stored in a pixel memory in the sequence along a print image column but are stored as a modified pattern along a diagonal in three sub-regions lying above one another in order to compensate changes in the pattern caused due to the non-interlaced arrangement of the modules. The solution is based on complete patterns of binary pixel data modified dependent on a pixel data change unit, the binary pixel data being intermediately stored in the pixel memory. The print images are compiled before the printing such that the images are read by a print data controller directly from the pixel memory into a shift register, and are serially transmitted to a shift register in the printhead and can be transferred into a latch. The print data controller is realized together with other assemblies in an ASIC (U.S. Pat. No. 5,710,721, European Application 1 154 382).
Some postal demands can be satisfied only with this solution since the microprocessor is supported by the specific pixel data change unit in the ASIC on the Jet Mail CPU board when modifying the image data of variable picture elements. The pixel data change unit is capable of modifying the variable picture elements between successive frankings such that these are stored in the form of binary pixel data in a pixel memory before the printing. The arrangement of the picture elements (pixels) in the pixel memory required for the printing is not beneficial for the modification of picture elements by the microprocessor because of the oblique position of the print modules of the printhead, and would require a high computing outlay. Even given support by a pixel-editing unit, th
Francotyp-Postalia AG & Co. KG
Hamdan Wasseem H.
Hirshfeld Andrew H.
Schiff & Hardin LLP
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