Image forming apparatus and varnish applying apparatus

Patent metadata

Field	Value
Publication number	US-12105449-B2
Application number	US-202318219164-A
Country	US
Kind code	B2
Filing date	Jul 7, 2023
Priority date	Jul 8, 2022
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

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 with first toner including carbon black;
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;
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; and
a controller configured to:
control the conveyance of the recording material by the conveying unit so that a conveying speed of the recording material in a case that the varnish is applied to the recording material on which the toner image is formed by the image forming unit is slower than a conveying speed of the recording material in a case that the varnish is applied to the recording material on which no toner image is formed by the image forming unit, and
control irradiation of the varnish with the light by the irradiation unit so that intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material on which the toner image is formed by the image forming unit 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 on which no toner image is formed by the image forming unit.

2. The image forming system according to claim 1 , wherein the image forming unit further forms a toner image with second toner containing no carbon black,
wherein the controller controls the conveyance of the recording material by the conveying unit so that a conveying speed of the recording material in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner is slower than a conveying speed of the recording material in a case that the varnish is applied to the recording material on which the toner image is formed with the second toner without using the first toner, and
wherein the controller controls irradiation of the varnish with the light by the irradiation unit so that intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner 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 on which the toner image is formed with the second toner without using the first toner.

3. The image forming system according to claim 1 , wherein the image forming unit forms the toner image on the basis of image data,
wherein the varnish applying unit applies the varnish to the recording material on the basis of varnish image data, and
wherein the controller discriminates whether or not the varnish is to be applied to the recording material on which the toner image is formed on the basis of the image data and the varnish image data.

4. The image forming system according to claim 2 , wherein the controller acquires image data relating to the toner image formed with the first toner, and
wherein the controller determines, on the basis of the image data, the conveying speed of the recording material in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner.

5. The image forming system according to claim 4 , wherein the controller determines, on the basis of the image data, an amount of the first toner deposited on the toner image, and
wherein the controller determines, on the basis of the amount of the first toner, the conveying speed of the recording material in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner.

6. The image forming system according to claim 2 , wherein the controller acquires image data relating to the toner image formed with the first toner, and
wherein the controller determines, on the basis of the image data, the intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner.

7. The image forming system according to claim 6 , wherein the controller determines, on the basis of the image data, an amount of the first toner deposited on the toner image, and
wherein the controller determines, on the basis of the amount of the first toner, the intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner.

8. The image forming system according to claim 4 , wherein the controller determines, on the basis of the image data, the intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner.

9. The image forming system according to claim 1 , wherein an integrated light quantity determined on the basis of the conveying speed of the recording material conveyed by the conveying unit and the intensity of the light irradiated from the irradiation unit in a case that the varnish is applied to the recording material on which the toner image is formed by the image forming unit is equal to an integrated light quantity determined on the basis of the conveying speed of the recording material conveyed by the conveying unit and the intensity of the light irradiated from the irradiation unit in a case that the varnish is applied to the recording material on which no toner image is formed by the image forming unit.

10. The image forming system according to claim 2 , wherein an integrated light quantity determined on the basis of the conveying speed of the recording material conveyed by the conveying unit and the intensity of the light irradiated from the irradiation unit in a case that the varnish is applied to the recording material on which the toner image is formed with the first toner is equal to an integrated light quantity determined on the basis of the conveying speed of the recording material conveyed by the conveying unit and the intensity of the light irradiated from the irradiation unit in a case that the varnish is applied to the recording material on which the toner image is formed with the second toner without using the first toner.

11. The image forming system according to claim 1 , wherein the first toner is black toner.

12. 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.

13. 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;
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; and
a controller configured to:
control the conveyance of the recording material by the conveying unit so that a conveying speed of the recording material in a case that the varnish is applied by the varnish applying unit to the recording material on which a toner image is formed by an image forming unit w

Assignees

• Canon Kk

Inventors

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

Classifications

• G03G15/5008 Primary

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

• B05D2501/00

  Varnish or unspecified clear coat · CPC title

• B05D3/061

  using U.V. · CPC title

• G03G2215/209

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

• G03G15/043

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