G - Physics – 01 – D
Patent
G - Physics
01
D
234/26
G01D 15/28 (2006.01)
Patent
CA 1285540
ABSTRACT OF THE DISCLOSURE A wave isolator (18) is provided for large format drafting plotters (10) for preventing waves in the draft- ing medium (16) from traveling up the platen (14) and adversely affecting the pen (20) and its operation and reducing acceleration related vertical scalloping of an- gled lines. Such waves in the medium are generated by the motion of the paper during the plot ing operation. The wave isolator comprises at least one strip (22a) of flexible material secured to the platen and of substan- tially the same length. Preferably, a polyimide film is used, having a coating of a thermoset acrylic resin with additives including conductive carbon black and polyethyl- ene. In operation, when the medium is moving upward, the wave isolator deflects under the increased inertial load, and air trapped between the medium and the platen exits at the sides of the medium, dissipating some of its energy. When the medium is moving downward, the wave isolator sees a negative change in load and responds by flexing upward, tending to increase the volume of air between the medium and the platen, creating a low pressure area which sucks air in at the sides of the medium, again dissipating its energy. Use of the wave isolator of the invention permits high speed, high acceleration plotting on both sheet and roll media without the aid of firmware solutions.
558152
Hewlett-Packard Company
Sim & Mcburney
LandOfFree
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