Recorders – Record receivers and/or driving means therefor
Patent
1992-04-30
1994-07-12
Fuller, Benjamin R.
Recorders
Record receivers and/or driving means therefor
355 73, 271194, 271276, G01D 1524
Patent
active
053293010
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to the field of electronic reproduction technology and is directed to a device for clamping sheet-shaped recording material onto a recording drum with vacuum suctioning in an electronic reproduction device, and is also directed to a method for clamping. For example, the electronic reproduction device is a color scanner or a color recorder for producing color separations for multi-color printing.
In such an electronic reproduction device, sheet-shaped film material, also referred to as film proofs, are clamped onto the recording drum and fixed thereat by vacuum suctioning. The clamped film proofs are exposed point-by-point and line-by-line by a recording element, are then in turn unclamped from the recording drum and developed. The developed film proofs are the color separations for the multi-color print.
The film proofs 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 before clamping from roll film material situated in a roll film cassette.
It is necessary for an effective employment of an electronic reproduction device, in particular, to shorten the preparation and setting times in comparison to the times required for the actual film exposure. This can occur, among other things, in that optimally many work steps normally to be executed by the operator such as, for example, the clamping and unclamping of the film proofs onto or, respectively, from the recording drum are automated.
Added thereto is the desire to be able to expose film proofs of different formats, particularly large-format film proofs, for example for reproducing posters.
DE-B-22 09 515 already discloses an electronic reproduction device having a device for clamping sheet-shaped recording material onto a recording drum with vacuum suctioning.
The recording drum is a hollow cylinder that is closed by covers. Shaft extensions with which the recording drum is rotatably seated at the device carrier of the reproduction device are secured to the covers. The walls of the hollow cylinder are 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 extension is hollow, a suction channel thus arising that connects the interior of the drum to a stationary vacuum pump via a rotary transmission leadthrough secured to the shaft extension and via a stationary suction line.
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 on the basis of a manually actuatable roller and lever mechanism in the known reproduction device. The vacuum pump is then activated 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 unclamped and conveyed back into the roll film cassette by the roller and lever mechanism.
The apparatus disclosed by DE-B-22 09 515 has the disadvantage that only film proofs of given formats and provided with registration perforations can be clamped and that the clamping and unclamping can only ensue with the collaboration of an operator.
U.S. Pat. No. 4,268,841 discloses an electronic reproduction device that already comprises a means for the automatic clamping of sheet-shaped recording material onto a recording drum, for vacuum suctioning of the recording material against the recording drum and for the automatic unclamping of the exposed recording material from the recording drum. The sheet-shaped recording material is automatically conveyed from a supply station to the recording drum via a conveyor means, is wound around the recording drum with the assistance of an annular channel between drum surface and housing wall and is fixed thereon by vacuum suctioning. After the exposure, the recording material is
REFERENCES:
patent: 3908981 (1975-09-01), Naroff
patent: 4268841 (1981-05-01), Fujii et al.
patent: 4660825 (1987-04-01), Umezawa et al.
patent: 4660964 (1987-04-01), Yoshikawa
Patent Abstracts of Japan, E-83, Nov. 20, 1981, vol. 5, No. 181, Umezawa, "Sheet Retaining Device".
Patent Abstracts of Japan, E-268 Sep. 22, 1984, vol. 8, No. 209, Houjiyou, "Sheet Holder".
Balzeit Ralf
Lassen Bernd
Barlow Jr. J. E.
Fuller Benjamin R.
Linotype-Hell AG
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