Device for clamping recording substrates in sheet form

Details Device for clamping recording substrates in sheet form Device for clamping recording substrates in sheet form

H - Electricity

04

N

H04N 1/08 (2006.01) H04N 1/047 (2006.01)

Patent

CA 2069113

2069113 9107842 PCTABS00005 The invention relates to a device for clamping film material in sheets to the recording drum of a reproduction arrangement and the method of operation of said device. The recording drum (1) has axially directed rows (6) of suction apertures for securing the image substrate (22) by a vacuum. In the walls (8) of the recording drum (1) there are suction channels (7), each interconnecting the suction apertures (5) of one row (6). In the recording drum (1) is arranged a vacuum distributor (25; 26; 27; 29) controllable by the rotary movement of the drum (1) which selectively connects the individual suction channels (7) or the appropriate rows (6) of suction apertures to a fixed vacuum pump (13). The vacuum distributor (25; 26; 27; 29) can be controlled in such a way that, during the clamping process, first of all the vacuum is applied to those rows of suction holes on which the leading region of the recording substrate (22) lies. This produces a high initial vacuum so that the recording substrate does not slip. Thereafter further rows (7) of suction apertures are connected in accordance with the greater extent to which the recording substrate is wound on the rotating recording drum (1) and vacuum is applied to them. The actuation of further rows (7) of suction apertures depending on the peripheral length of the recording substrate (22) is terminated at that row (7) on which the end region of the substrate (22) lies. The device especially makes it possible to clamp and secure large-size recording substrates on the recording drum (1) without creasing and slip.

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