Axiohm

Schlumberger Industries

Axioohm

Bernard Patry

Alain Carnel

David J Clarke

Alain Chiffert

Openable thermal printer

A recording device for recording impressions made by a transfer thermal printer, the device comprising a transfer film paid out from a roll and taken up by a drum, the roll and the drum being disposed inside a cassette having a side wall including a setback defining a print zone, wherein the cassette includes a read window other than the print zone, guides designed to impose a path on the transfer film such that the transfer film passes the window between the roll and the drum, and a support for a contrast surface.

Device for reading the printing done by a transfer thermal printer

A thermal print head including a line of electrically resistive heating points and electronic controls for controlling sequential connection to a power supply providing electrical current, and including for each heating point a countdown register which is loaded prior to printing each line of points with a value corresponding to the length of time during which a connection should be maintained with the corresponding heating point starting from a print authorization instant common to all of the points. According to the invention, the print head includes sensors for sensing the resistance of each heating point in real time, which sensors are connected to a circuit for regulating the amount of energy actually supplied to the corresponding point.

Thermal print head with regulation of the amount of energy applied to

A device for registering the printing performed by a thermal transfer printer, wherein it is constituted by the film carrying the transfer ink after it has passed over the heating points of the print head and onto a film take-up spool that includes means enabling it to be coupled to a drive member synchronized with a drive member for driving the print medium.

Device for registering the operations of a thermal transfer printer

An electrical measuring device utilizing a shunt, an electronic measuring circuit floating at the potential of the shunt and a first voltage divider connected between the shunt and a neutral point to provide a first voltage signal to the circuit. To obtain the benefit of decoupling the potential between the shunt and the intermediate point of the first voltage divider, the device includes an additional terminal connected to the shunt by a second voltage divider, whose intermediate point supplies a second voltage signal used differentially with the first.

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Orsay, France

Bernard Patry