Abstract:
An arrangement is provided wherein a printer used with a host device is operated to generate print batch separator pages using the same blank sheets as are used to print respective pages of successive print jobs. The printer is directed to print a visually distinctive graphic indicator, such as a separator border, trim, header, visible banner or other visual indicator or markings. This eliminates the need for an additional printer separator page tray. Usefully, a host device is operated to generate a separator command in a specified PDL language. A printer control device receives the page separator PDL command, and software contained in the printer control converts the PDL command into a printer readable format (PRF). A printer component responsive to the PRF command then operates the printer to print the specified separator page.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Technical Field 
         [0002]    The invention disclosed and claimed herein generally pertains to an apparatus and method for providing printer separator pages, to divide or separate different documents or other discrete batches of printed pages. More particularly, the invention pertains to an apparatus of the above type wherein the same type of blank paper or sheets are used for both the separator pages and respective pages of the printed documents or batches. Even more particularly, the invention pertains to an apparatus of the above type wherein different visually distinguishable separator pages may be printed to identify the respective documents of different users, or of different host computers that use the same printer. 
         [0003]    2. Description of Related Art 
         [0004]    At present, both black ink printers and color printers may be provided with multiple paper trays, together with necessary software, in order to produce separator pages between different documents, or other batches of printed pages. A separator page is typically a colored sheet of paper, such as blue or yellow, that is inserted into a designated printer tray. The printer will print a header onto the colored paper when a user requests that a specified document or batch be printed. Immediately after the separator page has been printed, the specified print job is printed out on white paper, or on other paper that is different in color from the separator page. Thus, the separator page provides a simple but effective visual means to enable a user to readily distinguish respective pages of the specified print job from pages of another, immediately preceding print job. 
         [0005]    Herein, the terms, “batch” and “print batch” are used to refer to all the pages collectively resulting from any discrete print job or printing task assigned to a printer. These include, without limitation, documents, single pages, multiple copies of the same page, and any other discrete sequence of pages, wherein respective pages are to be kept together. 
         [0006]    Notwithstanding its benefits, there are a number of problems with the above present approach for producing separator pages. For example, a user could run out of colored paper and be forced to put white paper into the separator tray. This could also happen inadvertently. In either case, the resulting separator page would be of very limited benefit, since the boundary between two successively printed batches could generally not be determined by quick visual inspection. Alternatively, a user could run out of white paper and be forced to print desired documents or other batches on the colored separator paper. Once again, it would not be easy to quickly distinguish between the separator page and the pages of adjacent printed batches. Moreover, the present approach requires two separate trays that must both be kept supplied with paper to ensure proper operation. This, in turn necessitates additional time and effort, and extra hardware will generally be needed to support operation of the additional separator paper tray. The additional hardware tends to increase printer cost and maintenance requirements. 
       SUMMARY OF THE INVENTION 
       [0007]    In accordance with the invention, a printer used with a computer system, or other host device, is operated to generate print batch separator pages using the same blank paper or sheets as are used to print respective pages of successive batches. The blank sheets used may be white or may be some other color. The printer is directed to print a separator border, trim, header, visible banner or other visual indicator or markings. Thus, the need for an additional separator page tray for a printer, as well as the hardware mechanisms and linkages required therefor, is eliminated in embodiments of the invention. One such embodiment is directed to an apparatus for operating a printer to print successive first and second print batches using blank sheets that, prior to printing, appear to be substantially identical. The system comprises a host device operable to generate a separator command in a specified page description language, and a printer control device coupled to receive the page separator command. The system further comprises a computer readable medium contained in the printer control and provided with software configured for use in converting the page separator command into a format readable by the printer. A printer component is disposed to receive the page separator command in the printer readable format, and to operate the printer in response to the printer command to print a separator page on one of the sheets that is visually distinct, at least, from both the last page of the first batch and the first page of the second batch. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein: 
           [0009]      FIG. 1  is a block diagram showing delivery of print commands to an inkjet printer from a host computer connected thereto. 
           [0010]      FIG. 2  is a block diagram showing a printer configuration, wherein a community laser printer connected to serve multiple host computers is operable in accordance with an embodiment of the invention. 
           [0011]      FIG. 3  is a block diagram showing the laser printer of  FIG. 2  in further detail. 
           [0012]      FIG. 4  is a block diagram showing a control for the printer of  FIG. 2 . 
           [0013]      FIG. 5  is a flowchart illustrating steps of an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0014]    Referring to  FIG. 1 , there is shown a host computer  102  connected to submit a print job, comprising instructions and data to be printed, to an inkjet printer  104 . For an inkjet printer, the application being used by the computer  102  must first send the data to be printed to a printer driver  106 . The driver converts or translates the data into a format that the printer can understand, and checks to see that the printer is online and available to print. The data is then sent by the driver from the computer to the printer via a connection interface such as a parallel port or USB port. 
         [0015]    To print a separator page in accordance with an embodiment of the invention, a user of host computer  102  could first select Print menu, then select Properties therefrom and then select Separator Page. Upon executing the Separator Page command, the printer would be instructed or commanded to print a separator page. More particularly, the printer would be commanded to use a sheet of white document paper to print a visual indicator or other marking on the separator page. The visual indicator could comprise an element such as a border, trim, grid, header, or a visual banner. It is anticipated that for a printer using black ink to print on white paper, any such visual indicators would suffice to make a separator page readily distinguishable from adjacent documents or other printer pages. 
         [0016]    Moreover, by proper configuration of the controlling software, the printer could be adapted to selectively change or vary the appearance of the border, header or other visual indicator, to produce visually different separator pages. The different separator pages could then be used to readily identify or distinguish between different users or different print jobs. For example, the separator pages could be coded based on user identification (ID), or on the name of the print job submitter. In one example, persons having names that start with A-C could have a diagonal striped pattern. The next three could have a horizontal dash pattern, and so on. 
         [0017]    For color printers, a number of additional software based features may be made available. For example, a separator page could be printed having a blue color background with black wording, to make it appear similar to what would have been printed on a blue page if the printer had a separate separator paper tray with blue paper. Also, different color coded separator pages could be printed, based on the user ID or name of the print job submitter. For example, those that had names starting with A-C could be printed with a red background, the next alphabetical group could have a blue background and so on. More generally, color printers could provide separator pages printed with different selected background colors, border colors, grid patterns and solid colors, or mixtures of colors for patterns, headers and wording. 
         [0018]    For both color and black ink printers, further variations could be provided for separator pages, if the printer has double sided printing capability. 
         [0019]    Referring to  FIG. 2 , there is shown a printer  202 , usefully comprising a laser printer, connected to host computers  206 - 212 , through a printer controller  214 . Thus, printer  202  serves as a community printer, to provide printing services for multiple users. Each of the host computers communicates with the printer control  214  through a connection interface such as parallel port or a USB port. 
         [0020]    The control  214  could be shown to reside within printer  202 , but has been shown external thereto in  FIG. 2 , to emphasize its essential role in communication between the host computers  206 - 212  and the printer  202 . The printer controller  214  serves as the main computer for the printer  202 , and may have to periodically start and then stop a connected host computer, to process the information received therefrom. The controller  214  handles each connected host computer separately, but may exchange data with different host computers on a concurrent basis. In laser printers such as printer  202 , it is common for the controller to save print job data in its own memory. This allows the control to put different printing jobs into a queue, so that it can work through them one at a time. This also saves time when printing multiple copies of a document, since the host computer needs to send the data out to the printer only once. 
         [0021]    In order for the printer controller  214  and one of the host computers  206 - 212  to communicate, they need to speak the same page description language (PDL). At present, a user may have to select a font from hundreds of different fonts, or may desire to print a complex graphic. Accordingly, printer  202  must be able to communicate in a comparatively advanced language. Some of these languages describe a page in vector form, that is, as mathematical values of geometric shapes. The printer controller receives the vector image language, or other PDL language, and converts it into a bit map page, which comprises a series of very small dots. With this system, the printer can receive elaborate or complex pages, picturing any sort of font or image. Moreover, the printer controller  214  must organize all of the data it receives from the host computer. This includes all of the commands that tell the printer  202  what to do, such as what paper to use, how to format the page and what font to use. 
         [0022]    Referring to  FIG. 3 , there is shown laser printer  202  generally comprising an electronic section  302 , optics  304  and a mechanical section  306 . Electronics  302  includes printer controller  214 , provided with a CPU  308  and a memory  310 , a video controller  312  and a motor controller  314 . Motor controller  314  is provided to control operation of motors and movement of mechanical components of printer  202 . 
         [0023]    Optics  304  includes a laser  316 , a scanner mirror  318  operated by a scanner motor  320 , a beam position sensor  322  and a beam to drum mirror  324 . The laser  316  receives page data, one line at a time, through the video controller  312 . The page data received by the laser is in the form of bit map image data, and thus comprises a pattern of tiny dots as described above. The laser emits a pulse of light for each dot to be printed, and emits no pulse for each dot of blank space. The emitted laser signal is projected to scanning mirror  318 , and is then directed by mirror  318  to the beam to drum mirror  324 . 
         [0024]    Respective optics components act to scan the beam projected by laser  316 , comprising a line of page data, along the surface of a rotating photosensitive drum  326  of mechanical section  306 . Initially, drum  326  is given a total positive charge. As the drum revolves, the laser beam projected across the surface discharges points on the surface contacted by the emitted laser pulses, so that such points become negatively charged. In this way, the laser “draws” the letters and images to be printed as a pattern of electrical charges, so that the pattern comprises an electrostatic image. After the pattern is set on the drum, a coating of positively charged toner is applied thereto, the toner comprising a fine black powder. Since it has a positive charge, the toner clings to the negatively discharged areas of the drum  326 , but not to the positively charged background areas of the drum. When the powder pattern is affixed to the drum surface, the drum  326  rolls over a page sheet (not shown), which is moving along a drum  326 . Before the paper is moved under the drum, it is given a negative charge by the transfer roller  330 . This charge is stronger than the negative charge of the electrostatic image, so that the paper can pull the toner powder away from the drum surface. Since it is moving at the same speed as the drum  326 , the paper picks up the image pattern exactly. To keep the paper from clinging to the drum, it is discharged by separation roller  332 , immediately after picking up the toner. The drum clearing assembly  334  then prepares the surface of the drum to receive another line of page data from a scanned laser beam. 
         [0025]    After receiving the toner, a feeder  336  directs the paper through a fuser  338 , comprising a pair of heated rollers  338   a  and  338   b . As the paper passes through these rollers, the loose toner powder melts, fusing the toner with the fibers of the paper. The fuser  338  and printer delivery assembly  340  then act to move the paper to the print output tray  342 . 
         [0026]    Referring to  FIG. 4 , there are shown principal components of printer controller  214 . The CPU  308  thereof is shown provided with a DMA Controller (DMA)  402 , an Interrupt Control Unit (ICU)  404  and a number of timers  406 . Floating Point Unit (FPU)  408  may be optionally included. The control logic  410  comprises a video shifter, a printer mechanism control, and a keyboard display control which may be respectively implemented in a system ASIC. The controller memory includes EPROMS and buffers  412  and a DRAM  414 . A controller interface usefully includes both an RS232 interface and a centronics connector, which is commonly used for parallel printer interfaces. Respective components of controller  214  are interconnected by means of a bus  418 . 
         [0027]    As stated above, printer controller  214  performs computation and control tasks aimed at converting images, provided by a connected host computer and a page description language (PDL) format, into a bit map image that is sent to the printer optics and mechanical section. The PDL contains the instruction needed to create the image to be printed on a page, a task that may require a high performance 32-bit CPU. Once the data has been structured, the controller begins putting the page together. It sets the text margins, arranges the words and places in any specified graphics. When a page is arranged, the controller takes the page data, either as a whole or piece by piece, and breaks it down into the array of tiny dots comprising the bit map image. 
         [0028]    It will be readily apparent that the above procedure will be followed by the controller  214 , in preparing a selected graphic or visual indicator for printing on a separator page, in accordance with embodiments of the invention. 
         [0029]    Referring to  FIG. 5 , there is shown a function block  502  indicating that a host computer is operated to generate a PDL command to print a separator page. Function block  504  shows the command converted to a printer readable format (PRF) by the printer control. It is to be understood that “printer control”, as used herein, is intended to be a generic term referring, for example, to devices such as printer driver  106  of inkjet printer  104 , and to devices such as printer controller  214  of laser printer  202 , but not limited to these types of printers. 
         [0030]    Referring further to  FIG. 5 , decision block  506  indicates that it is necessary to consider whether or not the associated printer is a color printer. If not, the separator page command will direct the printer to set up a particular graphic or visual indicator for imprinting, as shown by function block  510 , to create the intended separator page. If the printer is a color printer, the separator page command will first specify a color or colors to the printer for respective features of the graphic indicator, as shown by function block  508 . After the graphic indicator has been selected, the separator page is printed, as indicated by function block  512 . 
         [0031]    It is important to note that while the present invention has been described in the context of a fully functioning data processing system, those of ordinary skill in the art will appreciate that the processes of the present invention are capable of being distributed in the form of a computer readable medium of instructions and a variety of forms and that the present invention applies equally regardless of the particular type of signal bearing media actually used to carry out the distribution. Examples of computer readable media include recordable-type media, such as a floppy disk, a hard disk drive, a RAM, CD-ROMs, DVD-ROMs, and transmission-type media, such as digital and analog communications links, wired or wireless communications links using transmission forms, such as, for example, radio frequency and light wave transmissions. The computer readable media may take the form of coded formats that are decoded for actual use in a particular data processing system. 
         [0032]    The description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention, the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.