Ink ribbon unit and method of judgment of ink ribbon jamming
AssigneeCanon Finetech Inc.
InventorAtsunobu TAKATSUKA
Life of this patent
Estimating the term…
Abstract
Magnetic force lines 51 are generated in the direction from a first limited portion 52 of an inside peripheral face 50a of a ribbon-delivering cylindrical core toward an opposing second limited portion 54. A first magnet is fixed at the first limited portion: a second magnet is fixed at the opposing second limited portion. With the ink ribbon cassette 40 set in a main body of a printer 10, a magnetic sensor 24 takes the position in the middle of the inside of the ribbon-delivery core 50, and detects the magnetic force line 51.
Claims6
1-10. (canceled)
A method for judging ink ribbon jamming, comprising
- generating magnetic force lines, invariably in a direction from a first limited portion of an inside wall face of a ribbon core toward an opposing second limited portion thereof, with rotation of a cylindrical ribbon core having an outside peripheral face with a ribbon of a predetermined width wound thereon, detecting only the magnetic force lines in a predetermined direction, and
- judging occurrence of the ink ribbon jamming from a time interval between successive detection of the magnetic force lines.
A method for judging ink ribbon jamming, comprising
- generating magnetic force lines, invariably in the direction from a first limited portion of the inside wall face of the ribbon core toward an opposing second limited portion thereof, with rotation of a cylindrical ribbon core having an outside peripheral face with a ribbon of a predetermined width wound thereon, and simultaneously generating a constant pulse, detecting only the magnetic force lines in a predetermined direction,
- counting the number of the pulse in a time interval of detection of the magnetic force lines, and
- judging occurrence the ink ribbon jamming from the counted number of the pulse.
(canceled)
(canceled)
Dependencies are inferred from the claim text.