Recorders – Record receivers and/or driving means therefor – Drum
Patent
1992-02-18
1994-10-11
Fuller, Benjamin R.
Recorders
Record receivers and/or driving means therefor
Drum
271196, 271276, 346 24, H04N 108
Patent
active
053551567
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is in the field of electronic reproduction technology and is directed to a device and to the operation thereof for automatically clamping film material onto the recording drum of a reproduction device, for the vacuum control of the recording drum and for releasing the film material exposed by a recording element from the recording drum. In particular, the reproduction apparatus is a color scanner or color recorder.
In reproduction technology, color separations for multi-color printing are produced with color scanners or color recorders. For that purpose, color signals are first acquired by optoelectronic, trichromatic scanning of a chromatic original and these color signals are converted into color separation signals by a color correction. Sheet-shaped film materials, also referred to as film proofs or film sheets are clamped on a recording drum of the color scanner or color recorder and are exposed point-by-point and line-by-line by a recording element that is modulated in brightness by the color separation signals. The exposed film proofs are released from the recording drum and are developed. The developed film proofs are the color separations for the multi-color printing.
The film proofs to be exposed and having different formats can already be present in the form of sheet film material that is taken from a sheet film cassette for clamping or that is cut-off from roll film material situated in a roll film cassette before the clamping.
In traditional color scanners or color recorders, the film proofs to be exposed are manually clamped onto the recording drum and are fixed thereat either with adhesive tape or with a vacuum suction.
It is required for an effective and economical use of a color scanner or color recorder to enhance the efficiency particularly by shortening the preparation and adjustment times at the color scanner as compared to the times required for the actual film exposure. The preparation and adjustment times, for example, can be reduced in that the optimum adjustment parameters for a good reproduction are calculated by an operator in a prior process on the basis of work preparation devices (AV devices) and are stored and are then transferred into the color scanner in a short time immediately before the film exposure. At the same time, as many work steps as possible that are to be normally executed by the operator must be automated, for example the clamping and releasing of the film proofs onto or, respectively, from the recording drum.
Added thereto is the desire to be able to expose film proofs having different formats, particularly large-format film proofs, for, for example, reproduction of posters.
DE-B-22 09 515 already discloses an electronic reproduction device having a means for clamping sheet-shaped recording material onto a recording drum with vacuum suctioning and for releasing the exposed recording material.
The film proofs to be exposed, which are situated in a sheet film cassette, have their registration perforations hooked over registration pins situated on the recording drum with a manually actuatable roller and lever mechanism in the known reproduction device. The vacuum pump is then switched on and the recording drum is turned, as a result whereof the film proofs are pulled from the sheet film cassette, are wound around the rotating recording drum and are fixed on the drum surface by the vacuum. After the exposure, the film proofs are released and are in turn conveyed back into the roll film cassette by the roller and lever mechanism.
The recording drum is a hollow cylinder that is closed by covers. Shaft journals with which the recording drum is rotatably seated at the device carrier of the reproduction device are secured to the covers. The wall of the hollow cylinder is provided with suction holes for suctioning the film proofs against the drum surface. The suction holes are in communication with the interior of the drum. One shaft journal is hollow, a suction channel arising as a result thereof which connects the drum interi
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Balzeit Ralf
Behrens Gunnar
Bloehdorn Gerhard
Lassen Bernd
Penza Hans
Barlow John
Fuller Benjamin R.
Linotype-Hell AG
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