Apparatus for applying reference markings to wallboard during manufacture
An apparatus and method for applying reference or grid markings to wallboard during the manufacturing process is disclosed. Reference or grid markings are applied to one sheet of cover paper at a location between the originating cover paper rolls and the cover paper creaser or creasers. This is accomplished by locating and aligning multiple print heads across the width of the continuously passing cover paper, such that markings are ejected onto the cover paper in a specific and coordinated fashion. In addition to using any suitable commercially-available computer equipment to coordinate printer head activity, this function is accomplished by attaching each print head to a common horizontal support element and provide individual adjustments that are perpendicular to, and with the directional flow of the passing cover paper.
1. An apparatus for applying reference markings to wallboard during a wallboard manufacturing process, comprising:
(a) a horizontal element that traverses cover paper used to construct said wallboard, the horizontal element being located in between a cover paper source and a slurry source of the wallboard manufacturing process;
(b) one or more printing devices attached to said horizontal element at a predetermined spacing so that the one or more printing devices form a substantially symmetric pattern of marks along the cover paper by ejecting marking material on the cover paper as the cover paper passes by the printing devices on the cover paper's way from the paper source to the slurry source;
(c) one or more mounting brackets connecting said one or more printing devices to said horizontal element; and
(d) at least one follower arm connected to said horizontal element and tangentially connected to the cover paper so that any horizontal shift in the cover paper equally shifts the follower arm which in turn equally shifts the horizontal element in order to keep the attached printing devices in horizontal alignment with the cover paper, as the cover paper passes by the printing devices to create the symmetric pattern.
2. The apparatus of claim 1 , wherein said one or more printing devices comprise one or more print heads.
3. The apparatus of claim 2 , wherein said one or more print heads comprise one or more ink ejectors.
4. The apparatus of claim 1 in which substantially symmetric pattern of marks comprise marks spaced away from a first mark on an edge of the cover paper at 16 inches, 24 inches, 32 inches, and 48 inches.
5. The apparatus of claim 1 in which the one or more printing devices comprise five print heads.
6. The apparatus of claim 1 in which printing devices are coordinated by a controller such that successive marks from each of the printing devices are a predetermined distance apart.
7. The apparatus of claim 6 in which the predetermined distance is four inches.
8. The apparatus of claim 6 in which the marks are trademarks.
9. The apparatus of claim 6 in which the marks comprise squares.
10. The apparatus of claim 9 in which the squares have a length of one inch.
11. The apparatus of claim 1 in which the marking material is ink.
12. The apparatus of claim 1 in which one of the one or more mounting brackets comprises a standard bracket rigidly attaching the printing device to the horizontal element.
13. The apparatus of claim 1 in which at least one of the one or more mounting brackets comprises a standard bracket and an adjuster bracket to allow the printing device to be rotated with respect to the horizontal element.
14. The apparatus of claim 1 , wherein said horizontal element comprises a support structure.
15. The apparatus of claim 1 , further comprising a control unit to coordinate the activity of said one or more printing devices.
16. The apparatus of claim 15 , wherein said control unit comprises a computer.
17. The apparatus of claim 15 , wherein said follower arm connects the horizontal element to one or more creaser elements in the manufacturing process, so as the creaser elements are adjusted horizontally in sync with any horizontal shifts in the cover paper the horizontal adjustment is translated through the follower arm to the horizontal element and attached printing devices.