Pneumatic braking device for a recording substrate
AssigneeSiemens Nixdorf Informationssysteme Aktiengesellschaft
InventorsJoachim Hoffmann, Edmund Creutzmann, Walter Kopp, Helmut Berger
Life of this patent
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Abstract
An electrographic printing or copying machine contains, by way of example, a preheating saddle (20,21) positioned upstream of a pair of fixing rollers in the recording substrate running direction and a braking element (10). The preheating saddle (20,21) and braking elements (10) form a gliding surface (23). Suction openings (18,19) in fluid communication with a vacuum-generating device ensure good contact between gliding surface (23) and recording substrate. With the aid of a valve (1), the vacuum can be matched to the operating parameters of the printing and copying machine, or to the parameters of the recording substrate.
Claims20
A pneumatic braking device for a recording substrate in an electrographic imaging machine, the braking device comprising:
- a braking element which has a braking gliding surface accepting the recording substrate and having at least one suction opening;
- a guiding saddle of a fixing device, arranged downstream of the braking element in a running direction of the recording substrate, the guiding saddle having a saddle gliding surface accepting the recording substrate, the saddle gliding surface having at least one suction opening;
- a vacuum-generating device in communication with each suction opening;
- and
- a valve, the valve including a valve channel and a rotary piston arranged in the valve channel, rotation of the rotary piston varying an effective valve channel cross-sectional area of the valve channel, the rotary piston having a cross-sectional shape such that during rotation of the rotary piston the vacuum is changed approximately linearly with respect to the angle of rotation.
A pneumatic braking device for a stopping a sheet recording medium which is transportable in a running direction in an electrographic imaging machine, the braking device comprising:
- a braking element having a braking gliding surface along which the recording substrate is transported, the braking gliding surface having at least one suction opening;
- a preheating saddle arranged downstream of the braking element relative to the running direction, the preheating saddle having a saddle gliding surface along which the recording substrate is transportable, the saddle gliding surface having at least one suction opening;
- a vacuum-generating device causing a vacuum pressure into each said suction opening;
- and
- a valve controlling communication between the vacuum-generating device and the openings, the valve in including a rotatable piston disposed in a valve channel, rotation of the piston varying a degree of vacuum pressure at the suction openings as generally a linear function of an angle of piston rotation.
Dependencies are inferred from the claim text.