Image forming apparatus and method, and image applied article

B - Operations – Transporting – 41 – J

Patent

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Details

B41J 2/325 (2006.01) B41J 2/36 (2006.01)

Patent

CA 2341694

An image forming apparatus uses an ink ribbon (7) having a plurality of ink layers (72) of different colors, and a long, film-like intermediate transfer medium (6). A platen (10) for holding the intermediate transfer medium (6) during transfer is driven by a motor (50) via a synchronous reduction gear (51 - 58) whose speed reducing ratio is an integer multiple. The ink ribbon (7) is selectively heated by a thermal head (38) having substantially regular polygonal or substantially circular heat-generating portions (38a). Under the control of a controller (C1), the thermal head (38) is driven on the basis of image information, and a record image containing an area gradation image is formed on the intermediate transfer medium (6). This area gradation image has a color set by stacking dots having different colors in substantially the same spot. The intermediate transfer medium (6) on which the record image is formed is overlapped on a target body (1) and heated and pressed by a heat roller (40), thereby transferring the record image from the intermediate transfer medium (6) onto the target body (1).

Dans ce dispositif de formation d'image, on utilise un ruban (7) présentant plusieurs couches d'encre (72) de différentes couleurs, ainsi qu'un support de transfert intermédiaire (6), sous forme de bande. Une platine (10) destinée à retenir le support de transfert intermédiaire (6), lors du transfert, est entraînée par un moteur (50) au moyen d'un engrenage réducteur synchrone (51-58) dont le rapport de réduction est un entier. Le ruban (7) est chauffé de manière sélective par une tête thermique (38) au moyen d'éléments chauffants (38a), généralement sous forme de cercle ou de polygone régulier. La tête thermique (38) est entraînée par des moyens de commande (C1) en fonction d'informations d'image, des images en demi-teintes étant formées sur le support de transfert intermédiaire (6), images dont une couleur est constituée par différents points de couleur superposés dans la même zone. Le support de transfert intermédiaire (6) présentant les images est superposé sur un objet (1), puis chauffé et pressé par un rouleau chauffant (40), de sorte que les images sont transférées sur l'objet (1), à partir du support de transfert intermédiaire (6).

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