Recorders – Record receivers and/or driving means therefor – Web
Patent
1993-04-22
1996-03-19
Fuller, Benjamin R.
Recorders
Record receivers and/or driving means therefor
Web
400613, H04N 108, H04N 106, B41B 1900
Patent
active
055006566
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention refers to the field of electronic reproduction technology and is directed to a device and to the operation thereof for clamping film material into an exposure trough of a reproduction apparatus operating according to the internal drum principle and for releasing the exposed film material from the exposure trough.
2. Description of the Related Art
In such an internal drum reproduction device, also referred to as an internal drum recorder or exposer, the film material is fixed at the inside surface of a stationary mount that is shaped like a half-shell or, respectively, like a cylindrical segment and that is also referred to as an exposure trough. A light beam that is modulated in brightness by an image signal is generated in a recording element, this light beam being deflected in the direction onto the exposure trough by a rotating deflection system and being guided point-by-point and line-by-line across the film material for recording information while the recording element moves in the direction of a longitudinal axis of the exposure trough. The exposed film material is then removed from the exposure trough and is further-processed.
EP-B-0 126 469 already discloses an internal drum reproduction apparatus having a device for clamping and releasing film material. In the known device, the film material is guided through the exposure trough along a conveying slot shaped like a segment of a regular cylinder whose size is somewhat greater than that of the film material to be conveyed in order to suppress excess friction, jamming problems or the like. However, problems can thereby possibly arise to the effect that the position of the film material in the exposure trough can vary slightly, namely it can lie closer to the inside or outside wall and, potentially, can also produce folds to a certain extent, this deteriorating the exposure quality. Further, the known device also does not allow a fully automatic threading of the film material into the conveying path since, given utilization of a supply cassette, the film material must first be introduced between the conveyor rollers at the apparatus side before the automatic film conveying can occur. Moreover, the film material can vary in its lateral conveying length, so that the film material can emerge in different positions at the film discharge gap.
It is an object of the invention to create a device and the operation thereof for clamping and releasing film material that allows a reliable positioning of the film material in the exposure trough.
With the present invention, a device is provided for clamping and releasing film material onto and from a stationary holder. The film material is conveyed through the holder from a film entry to a film outlet slot with a conveyor means and is also fixed on the holder during an exposure. A positioning unit provides to the film material a motion tendency which is opposite a conveying direction during clamping.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawing figure shows a device of the invention in cross-sectional view.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As a sectional view, the figure shows the fundamental structure of a device for the automatic clamping and releasing of film material on, or respectively from, the exposure trough of an electronic recording device operating according to the internal drum principle.
The film material to be clamped is deposited in a supply cassette 1 as roll film material, this supply cassette 1 being introduced into a mount 2 of the recording apparatus. The film material to be clamped--referred to below as film web 3--is conveyed via a pair of rollers 4, 5 arranged in the supply cassette 1 that are arranged at the film outlet of the supply cassette 1. The roller 5 is freely rotatable and is prestressed in the direction onto the one film surface by a spring, whereas the roller 4 presses against the film surface at the opposite side. The roller 4 is connected to a reversible drive means that comprises a gearwheel 6 t
REFERENCES:
patent: 3689150 (1972-09-01), Nothmann et al.
patent: 3730623 (1973-05-01), Jordan
patent: 4595957 (1986-06-01), Holthusen
patent: 4684228 (1987-08-01), Holthusen
Behrens Gunnar
Blohdorn Gerhard
Penza Hans
Fuller Benjamin R.
Gordan Raquel Yvette
Linotype-Hell AG
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