Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Plotter with drive rollers having variable radial contact surfaces










Image Number 5 for United States Patent #5138341.

A plotter wherein, while a sheet is being moved on a recording surface, figures, characters etc. are automatically depicted on the surface of the sheet, or the contours of figures, characters etc. are automatically cut in the surface of the sheet. In the plotter, both the side edges of the sheet are respectively held between drive rollers and corresponding pinch rollers mounted at both the sideward parts of the recording surface in opposition to each other, and the drive rollers at both the sideward parts of the recording surface are rotated synchronously to each other, whereby the sheet is moved in the rotating direction of the drive rollers on the recording surface. Each of the drive rollers is formed at its peripheral surface with milling or ruggedness for preventing the sheet from slipping. The plotter comprises piston-cylinder assemblies and associated springs for regulating respective pressures acting to press the pinch rollers at both the sideward parts of the recording surface against the surface of the sheet. It also comprises sensors for sensing the directions and degrees of the wobbles of the sheet moving on the recording surface, and a controller for controlling the lengths of the springs in accordance with the direction and degree of the wobble of the sheet sensed by the sensors, thereby to regulate the respective pressures acting to press the pinch rollers at both the sideward parts of the recording surface against the sheet surface. When the sheet has begun to wobble, the direction and degree of the wobble are sensed by the sensors, and the pressure acting to press the pinch roller against the sheet surface is increased or decreased, thereby to correct the moving orbit of the sheet.








 
 
  Recently Added Patents
Superagonistic anti-CD28 antibodies
Portable gaming device and gaming system combining both physical and virtual play elements
Container
Facility to reuse paper
Sublingual coated tablet of fentanyl
Image descriptor quantization
Documentation roadmaps and community networking for developers on large projects
  Randomly Featured Patents
Member for retaining rolling bodies
Combined painting tool and feed pump
Method and apparatus for determining an optimal pumping rate based on a downhole dew point pressure determination
Defect inspecting apparatus and defect inspecting method
Polycarbonate coated with photocurable polythiol and different polyenes
Method of altering composition of nutritional product during enteral tube feeding
Phase locked loop motor speed control
Touch response sensor for an electronic musical instrument
Cooking grate
Fluidized bead bed