Electrophotography – Machine operation – Having power supply
Reexamination Certificate
1999-06-29
2001-05-22
Grimley, Arthur T. (Department: 2852)
Electrophotography
Machine operation
Having power supply
C307S064000, C307S066000
Reexamination Certificate
active
06236819
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printer, and more particularly, to a printer which can supply auxiliary power necessary for the same to return to a reset state even if external power supply is interrupted.
2. Description of the Related Art
FIG. 1
is a schematic diagram of a printer engine of a general liquid color printer. Referring to
FIG. 1
, a reset device
15
, scanning units
16
, development devices
17
, a drying device
18
and a transfer device
20
are arranged around a photoreceptor belt
14
traveling along a plurality of rollers
11
,
12
and
13
.
In the operation of the printer, the scanning units
16
scan light onto the photoreceptor belt
14
traveling via the reset device
15
according to image signals to form a latent electrostatic image. The latent electrostatic image is developed by developer liquid delivered by the development devices
17
. The thus-developed image contacts the photoreceptor belt
14
and is transferred to a rotating transfer roller
21
to then be carried to a sheet
23
moving between the transfer roller
21
and a pressing roller
22
. The transfer roller
21
and the pressing roller
22
are heated at a predetermined temperature by a heater (not shown) incorporated in the printer.
While the printing operation is not performed, the transfer device
20
, the drying device
18
and the development devices
17
are separated from the photoreceptor belt
14
, to avoid transmission of heat from the transfer roller
21
and the pressing roller
22
to the photoreceptor belt
14
or damage to the photoreceptor belt due to being pressed by the transfer roller
21
and the development devices
17
.
In the course of performing the printing operation, if external power supply is cut off due to an unexpected interruption of power supply, the printer immediately stops the printing operation in progress. In such a state, if the power interruption is continued for a long time, the photoreceptor belt
14
maintained in a pressed state by the transfer roller
21
, a drying roller
18
a
, development rollers
17
a
may become damaged. Also, the developer liquid stuck to the photoreceptor belt
14
and the transfer roller
21
may be hardened to cause contamination on various parts of the printer.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a printer which can supply auxiliary power to convert the printer engine thereof into a printing suspension mode even if external power supply is abruptly interrupted during a printing operation.
Accordingly, to achieve the above objective, there is provided a printer including a power supply portion for converting power supplied from an external power source and supplying the same to the printer, a printer engine receiving power from the power supply portion through a power supply line, an auxiliary power storage portion for receiving power from the power supply portion to store auxiliary power, and supplying the auxiliary power necessary to drive the printer when the power supply from the external power source to the power supply portion is interrupted, a switching portion installed between the auxiliary power storage portion and the printer engine, for intermittently supplying power, and a printer controller for detecting a potential level of the power supply line and controlling the switching portion.
The power supply portion includes a first port through which a voltage of +24 V is applied, and a second port through which a voltage of +5 V is applied, and the auxiliary power storage portion receives power from the first port and forms a +24 V-auxiliary voltage source and a first +5 V-auxiliary voltage source.
Also, the auxiliary power storage portion receives power from the second port and forms a second +5 V-auxiliary voltage source for applying a voltage of +5 V to the printer controller when the power supply from the power supply portion is interrupted.
REFERENCES:
patent: 4569585 (1986-02-01), Masuda
patent: 4771312 (1988-09-01), Yanase et al.
patent: 52-13728 (1977-02-01), None
patent: 62-296724 (1987-12-01), None
Japanese Publication No. 05-236744 A (with English language Abstract) Sept.10, 1993.
Japanese Publication No. 05-77474 A (with English langauge Abstract) Mar. 30, 1993.
Japanese Publication No. 04-331428 A (with English Language Abstract) Nov. 19, 1992.
Japanese Publication No. 09-294330 A (with English language Abstract) Nov. 11, 1997.
Japanese Publication No. 64-62720 A (with English language Abstract) Mar. 9, 1989.
Grimley Arthur T.
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tran Hoan
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