Method and device for controlling the paper feed in a processor-driven printer
AssigneeSextant Avionique
InventorsGilles Carpentier, Thierry Oddo
Life of this patent
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Abstract
The device embodying the invention is intended to equip a processor-driven printer comprising a hopper capable of containing and supporting a freely rotating roll of paper, a guide and drive means enabling the web of paper to be led from the roll to a drive device, to a line by line print station and then to an output orifice. It comprises at least one first detector capable of detecting marks affix on the web, in an area not used for printing. The invention applies to a printer of the type used in man/machine dialog or in remote transmission.
Claims13
A method for monitoring the paper feed in a processor-driven printer comprising a hopper capable of containing and supporting a freely rotating roll of a paper web, a guide and drive means enabling said paper web to be led on a path from the roll to a drive device, to a print station and then to an output orifice, said method comprising a succession of cycles each comprising the steps of:
- affixing a mark on said paper web by means of a marking device situated at a first location on said path, inside said printer,
- detecting presence or absence of the mark at least at a second location on said path,
- measuring in real-time a parameter representative of position of said mark throughout a portion of said path from the first location to the second location,
- comparing said parameter with reference values defining a theoretical position of said second location, and
- at the instant when said measured position corresponds with said theoretical position, verifying the presence of said mark, and sending a fault signal if said measured position does not correspond with said theoretical position.
A method for monitoring the paper feed in a processor-driven printer comprising a hopper capable of containing and supporting a freely rotating roll of a paper web, a guide and drive means enabling said paper web to be led on a path from the roll to a drive device, to a print station and then to an output orifice, said method comprising a succession of cycles each comprising the steps of:
- detecting presence or absence of a mark at several successive locations on said path between a first location and a last location,
- measuring in real-time a parameter representative of position of said mark all along a portion of said path from said first location to said last location,
- comparing said parameter with reference values defining respective theoretical positions of said successive locations, and
- at instants when said measured position corresponds with one of said theoretical positions of a location, verifying that said mark is indeed detected at said location, and sending a fault signal if said mark is not detected at said location.
A device for controlling paper feed in a processor-driven printer, said device comprising:
- a hopper capable of containing and supporting a freely rotating roll of a paper web,
- a guide and drive means enabling said paper web to be led on a path from the roll to a drive device, to a line by line print station and then to an output orifice,
- a marking device for affixing marks one by one on said paper web, situated at a first location on said path inside said printer,
- at least one first detector for detecting presence or absence of marks affixed on said paper web at least at a second location on said path in an area not used for printing,
- means for real-time measuring a parameter representative of position of a mark throughout a portion of said path from the first location to the second location,
- means for comparing said parameter with reference values defining a theoretical position of said second location, and
- means for verifying the presence of a mark at an instant when said measured position corresponds with said theoretical position, and means for sending a fault signal if no mark is detected at said instant.
Dependencies are inferred from the claim text.