Apparatus for producing an image on a first side of a substrate and a mirror image on a second side of the substrate

• US 5,801,721 A
• Filed: 09/09/1994
• Issued: 09/01/1998
• Est. Priority Date: 09/09/1994
• Status: Expired due to Fees

• Current Assignee: Salsa Digital Ltd (HP Inc.)
• Original Assignee: Signtech USA, Ltd.
• Inventors: Gandy, James, Janysek, Don Ray, Ahmed, Jubayer
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): ANDERSON, LYNNE D
• Application Number:
  US08/303,701
• Time in Patent Office: 1,453 Days
• Field of Search: 347/3, 347/9, 347/15, 347/37, 358/298, 358/456, 358/462, 358/455, 358/465, 358/466, 358/500, 358/502
• US Class Current: 347/3
• CPC Class Codes: B41J 11/004 Platenless printing, i.e. conveying the printing material freely, without support on its back, through the printing zone opposite to the print head
• CPC Class Codes: B41J 15/04 Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
• CPC Class Codes: B41J 3/60 for printing on both faces of the printing material
• CPC Class Codes: B65H 23/10 acting on running web suction retarders B65H23/24

Abstract

A printing system includes a scanner, a graphics computer, and a printer. The scanner optically scans an image and reduces it to a series of pixels represented in gray scale. After the scanner finishes converting the image into pixels, the graphics computer converts the gray scale representations of each pixel into a pixel conveying uniform density color information. The graphics computer then outputs the uniform density pixels to a print control system of the printer. The print control system receives the uniform density pixels and controls a printhead to print a reproduction of the image on a substrate suspended within the printer. Alternatively, the print control system controls a pair of printheads positioned on opposite sides of the substrate suspended within the printer to print a reproduction of the image on one side of the substrate and a mirror of the image on the opposite side of the substrate such that the images are in registry.

Claims

1. An apparatus for producing an image on a first side of a substrate and a mirror image on a second side of the substrate, comprising:

a computer that converts signals representing each pixel of the image in gray scale into signals representing each pixel of the image with a uniform density;

a first printhead driven relative to the first side of the substrate for applying ink to the first side of the substrate;

a second printhead driven relative to the second side of the substrate for applying ink to a second side of the substrate;

a substrate suspension system that supports a substrate feed roll, that drives the substrate relative to said first and second printhead from the substrate feed roll to a substrate rewind roll, and that tensions the substrate to maintain the substrate taut during the application of ink by said first and second printhead; and

a print control system that inputs the signals representing each pixel of the image with a uniform density and utilizes those signals to control said first printhead to produce the image on the first side of the substrate and said second printhead to produce the mirror image on the second side of the substrate.

2. The apparatus according to claim 1 further comprising means for reducing the image into signals representing each pixel of the image in gray scale.

3. The apparatus according to claim 1 wherein said first and second printhead communicate with a source of pressurized ink.

4. The apparatus according to claim 1 wherein said first and second printhead communicate with a source of ink and a source of pressurized air that draws ink from the source of ink and ejects the ink from said first and second printheads.

5. The apparatus according to claim 1 wherein said first and second printhead communicate with a source of pressurized ink and a source of pressurized air that atomizes the ink ejected from said first and second printhead.