Image forming apparatus and varnish applying apparatus

Patent metadata

Field	Value
Publication number	US-12535754-B2
Application number	US-202418806183-A
Country	US
Kind code	B2
Filing date	Aug 15, 2024
Priority date	Jul 8, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An image forming system includes an image forming unit, a varnish applying unit, a conveying unit, an irradiation unit, and a controller. The controller controls conveyance of a recording material so that a conveying speed of the recording material in a case that varnish is applied to the recording material with a toner image is formed is slower than a conveying speed of the recording material in a case that varnish is applied to the recording material with no toner image. The controller controls irradiation of the varnish with light so that intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material with the toner image is lower than intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material with no toner image.

First claim

What is claimed is:

1 . An image forming system comprising:
an image forming unit configured to form a toner image on a recording material, the toner image including a black toner image using black toner containing carbon black, and a color toner image using color toner containing no carbon black, a varnish applying unit configured to apply varnish to the recording material on which the toner image is formed by the image forming unit; a conveying unit configured to convey the recording material to which the varnish is applied by the varnish applying unit; and an irradiation unit configured to irradiate the varnish on the recording material with light to cure the varnish on the recording material during conveyance of the recording material by the conveying unit, wherein intensity of the light irradiated by the irradiation unit to the varnish on a first recording material having the black toner image is lower than intensity of the light irradiated by the irradiation unit to the varnish on a second recording material having the color toner image without the black toner image, and wherein a conveying speed of the first recording material by the conveying unit in a period in which the varnish on the first recording material is irradiated with light is slower than a conveying speed of the second recording material by the conveying unit in a period in which the varnish on the second recording material is irradiated with light.

2 . The image forming system according to claim 1 , wherein the varnish applying unit applies varnish onto the toner image on the recording material.

3 . The image forming system according to claim 1 , wherein the image forming unit forms the toner image based on image data, and
wherein a conveying speed of the recording material by the conveying unit is controlled based on the image data.

4 . The image forming system according to claim 1 , wherein the image forming unit forms the toner image based on image data, and
wherein intensity of the light irradiated to the varnish by the irradiation unit is controlled based on the image data.

5 . The image forming system according to claim 1 , wherein an integrated light quantity determined on the basis of the conveying speed of the first recording material conveyed by the conveying unit and the intensity of the light irradiated to the varnish on the first recording material from the irradiation unit is equal to an integrated light quantity determined on the basis of the conveying speed of the second recording material conveyed by the conveying unit and the intensity of the light irradiated to the varnish on the second recording material from the irradiation unit.

6 . The image forming system according to claim 1 , wherein the varnish is UV varnish of an ultraviolet radiation solidifiable type, and
wherein the light irradiated from the irradiation unit is ultraviolet radiation.

7 . A varnish applying apparatus for applying varnish to a recording material, comprising:
a varnish applying unit configured to apply varnish to the recording material; a conveying unit configured to convey the recording material to which the varnish is applied by the varnish applying unit; and an irradiation unit configured to irradiate the varnish on the recording material with light to cure the varnish on the recording material during conveyance of the recording material by the conveying unit, wherein intensity of the light irradiated by the irradiation unit to the varnish on a first recording material having a black toner image using black toner containing carbon black is lower than intensity of the light irradiated by the irradiation unit to the varnish on a second recording material having a color toner image using color toner containing no carbon black without the black toner image, and wherein a conveying speed of the first recording material by the conveying unit in a period in which the varnish on the first recording material is irradiated with light is slower than a conveying speed of the second recording material by the conveying unit in a period in which the varnish on the second recording material is irradiated with light.

8 . The varnish applying apparatus according to claim 7 , wherein the varnish applying unit applies the varnish onto the black toner image on the first recording material and applies the varnish onto the color toner image on the second recording material.

9 . The varnish applying apparatus according to claim 7 , wherein an integrated light quantity determined on the basis of the conveying speed of the first recording material conveyed by the conveying unit and the intensity of the light irradiated to the varnish on the first recording material from the irradiation unit is equal to an integrated light quantity determined on the basis of the conveying speed of the second recording material conveyed by the conveying unit and the intensity of the light irradiated to the varnish on the second recording material from the irradiation unit.

10 . The varnish applying apparatus according to claim 7 , wherein the varnish is UV varnish of an ultraviolet radiation solidifiable type, and
wherein the light irradiated from the irradiation unit is ultraviolet radiation.

Assignees

• Canon Kk

Inventors

• Hirota Shingo
• Tsukada Yoshiro
• Hano Masami
• Yamada Toshiyuki
• Kikuchi Kyohei
• Katayama Daisuke
• Hanazato Taro

Classifications

• G03G2215/209

  plural types of toner image handled by the fixing device · CPC title

• B05D2501/00

  Varnish or unspecified clear coat · CPC title

• G03G15/5008 Primary

  Driving control for rotary photosensitive medium, e.g. speed control, stop position control · CPC title

• G03G15/043

  with means for controlling illumination or exposure (G03G15/041 takes precedence) · CPC title

• G03G9/0904

  Carbon black · CPC title