Plotter with drive rollers having variable radial contact surfaces
US5138341A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | May 3, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J13/076
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
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 len…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.