Device for clamping sheet-shaped recording material
US5329301A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1992 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Apr 30, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04734
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention is directed to a device for clamping sheet-shaped film material onto the recording drum of a reproduction device and is directed to the operation of this device. The recording drum comprises axially proceeding suction-hole rows for the vacuum-fixing of the recording material. Suction channels, each of which connects the suction holes of a suction hole row to one another, proceed in the wall of the recording drum. A vacuum distributor controllable by the rotational movement of the recording drum is arranged in the recording drum, this controllable vacuum distributor selectively bringing the individual suction channels, the corresponding suction hole rows into communication with a stationary vacuum pump. The vacuum distributor is controllable such that that suction hole row on which the starting region of the recording material lies is first charged with vacuum during the clamping event. As a result thereof, a high initial vacuum is achieved, as a result whereof the recording material does not slip. Further suction hole rows are then successively cut-in in accordance with the increasing wrap of the rotating recording drum by the recording material and are charged with v…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.