US 8,542,261 B2 · Method for color erasing process and color erasing device

Method for color erasing process and color erasing device

AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha

InventorsKen Iguchi, Isao Yahata, Takahiro Kawaguchi, Yoshiaki Sugizaki, Kikuo Mizutani, Hiroyuki Taki, Hiroyuki Tsuchihashi, Chiaki Iizuka, Hidetoshi Yokochi, Toshiaki Oshiro, Hiroyuki Hazu, Yoichi Yamaguchi, Hiroyuki Sugiyama, Yuichi Saito

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Abstract

According to an embodiment, a method for color erasing process includes the steps of: supplying a power to a heat source configured to heat a sheet having an image formed thereon using a color erasable material so as to cause heat generation as warming-up control; stopping the power supply to the heat source for a predetermined period of time in the warming-up control if the temperature of the heat source is increased starting from a temperature lower than a predetermined reference value that is lower than a color erasing temperature of the color erasable material and exceeds the predetermined reference value; performing maintenance control that is power supply control to maintain the temperature of the heat source at the target temperature; and performing, after the passage of the predetermined period of time, a color erasing process by the heat source.

Claims20

Dependent claims

A method for color erasing process, comprising:

supplying a power to a heat source configured to heat a sheet having an image formed thereon using a color erasable material to be color erased by heat so as to cause heat generation as warming-up control to raise a temperature of the heat source to a target temperature set as a temperature used during a color erasing process;
stopping the power supply to the heat source for a predetermined period of time in the warming-up control if the temperature of the heat source is increased starting from a temperature lower than a predetermined reference value that is lower than a color erasing temperature of the color erasable material and exceeds the predetermined reference value;
performing, after a passage of the predetermined period of time, maintenance control that is power supply control to maintain the temperature of the heat source at the target temperature;
and
performing, after the passage of the predetermined period of time, a color erasing process by the heat source.

2 more elements

A color erasing device comprising:

a heat source configured to heat a sheet having an image formed thereon using a color erasable material to be color erased by heat;
a temperature detecting section configured to detect a temperature of the heat source;
a heat source controller configured to supply a power to the heat source as warming-up control to raise the temperature of the heat source to a target temperature set as a temperature used during a color erasing process, to stop the power supply to the heat source for a predetermined period of time in the warming-up control if the temperature of the heat source detected by the temperature detecting section is increased starting from a temperature lower than a predetermined reference value that is lower than a color erasing temperature of the color erasable material and exceeds the predetermined reference value, and to perform, after a passage of the predetermined period of time, maintenance control that is power supply control to maintain the temperature of the heat source at the target temperature;
and
a sheet feeding section configured to feed a sheet to the heat source for a color erasing process after the passage of the predetermined period of time.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/534,994Filed 27 Jun 2012 · us provisional application

Priority

30 Jun 2011

Published

US 2013/0002784 A13 Jan 2013

Granted

24 Sep 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

B41M 5/282
Using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas-…:…
B41J 2/32
Characterised by selective application of heat to a heat sensitive printing or impression-transfer material: using thermal heads
B41J 2202/37
Embodiments of or processes related to thermal heads: writing and erasing thermal head
B41M 7/0009
After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock: obliterating the printed matter;…

Family

Application61/503,575Us provisional application · filed 30 Jun 2011

Application61/503,576Us provisional application · filed 30 Jun 2011

Application61/508,489Us provisional application · filed 15 Jul 2011

US 2013/0002784 A1Pre-grant publication · published 3 Jan 2013

US 8,542,261 B2This patent

From the US filing history. Foreign family members aren’t listed.