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
Rate controlled first in first out (FIFO) queues for clock domain crossing
Soliciting first party in communication session to maintain call when degradation of connection to second party is anticipated
Representations of compressed video
Method and apparatus for executing load distributed printing
Method of manufacturing semiconductor devices using ion implantation
Mobile browser context switching
PLL circuit
  Randomly Featured Patents
System and method for making a correction to a plurality of images
Model based simulation of electronic discharge and optimization methodology for design checking
Method and apparatus for detecting and transducing intersaccular acoustic signals
Substance dispensing system
Hydrosol droplet casting process for production of nuclear fuel and breeder material granules
Method and apparatus for the testing of plastically deformable objects
Unique baffle to deflect remote plasma clean gases
Regulatory element conferring tapetum specificity
Production of secreted polypeptides
Hold-down device