Bull S.a.

Jacques Estavoyer

Bernard Cherbuy

Pascal Faivre

Jean-Pierre Messer

Daniel Kinet

Philippe Raulin

The invention relates to a method and an apparatus with which a powdered developer deposited onto a sheet of paper can be fixed. The method comprises moving the sheet in such a manner that its leading edge (BV) comes to face a source (47) integral with a movable support, initially placed in a position of repose, and then, after immobilization of the sheet, displacing the support over a distance (N) less than the length (L) of the sheet, and moving the support to the position of repose while simultaneously displacing the sheet in the same direction, at a speed greater than the speed of the support. The invention is applicable to magnetic printing machines.

Method for fixing a powdered developer deposited on a sheet, and

The invention relates to a device for intermittently applying particles of a powdered developer to the recording surface of a magnetographic printer. This device includes a reservoir (17) containing developer particles, a transport element (23) for placing these particles in the vicinity of the surface of a magnetic drum (11), a deflector (24) disposed between this transport element and the drum to apply the particles to the drum surface, and a squeegee (45) disposed between the deflector and the transfer station (H), and actuated by an electromagnet (EA) for selectively pulling away the particles that have been deposited on the drum surface. The invention is applicable to magnetographic printers.

Device for intermittent application of particles of a powdered developer

The invention relates to a powdered substance for lubricating the recording carrier of a magnetic printer. This solid substance is in the form of a powder comprising groups (G) of particles, each of these groups being formed by one particle (30) of lubricating insulating material surrounded on its periphery by particles (31) of conductive carbon, the number of the latter particles being sufficient to cover the entirety of the external surface of this particle of lubricating insulating material. The invention is applicable to magnetography.

Powdered substance for lubricating the recording carrier or a magnetic

A method for manufacturing a magnetic transducer including a plurality of heads. This method comprises placing p magnetic cores (such as 17-4) on a support plate (20), each core being provided with a winding (such as E4) extending over the entire length of the core, coating these cores within an insulating film (25), removing the turns located at the ends of each core, and connecting the turns (29, 30) located at the ends of the remaining turns to contact zones (37c, P-1, P-2, etc.). The method applies to the manufacture of transducers with which magnetic printing machines are equipped.

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Bavilliers, France

Jacques Estavoyer