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
Structural plasticity in spiking neural networks with symmetric dual of an electronic neuron
Digital processing method and system for determination of optical flow
Viruses lacking epithelial cell receptor entry
Method and arrangement for controlling semiconductor component
Security authentication method, apparatus, and system
Probe for ultrasound diagnostic apparatus
Polymers
  Randomly Featured Patents
Apparatus for restoring ink jet recording head
Mobile terminal having touch input device
Method and system for electronic distribution of product redemption coupons
Polymer filaments having profiled cross-section
Surgical gas plasma ignition apparatus and method
Friction drive actuator and hard disk device using such actuator
Stabilizing attachment for boring head
High data rate writer with low resistance coil and short yoke
Apparatus for reducing change in timbre at each point where tone ranges are switched
Electrodeposition of FeCoNiV films with high resistivity and high saturation magnetization