Ink driven solvent pump for an image forming apparatus

Ink driven solvent pump for an image forming apparatus
US008567928B2
(12) Ulllted States Patent
(10) Patent N0.:
Kotabe et a].
(54)
(45) Date of Patent:
Oct. 29, 2013
INK DRIVEN SOLVENT PUMP FOR AN
4,714,931 A *
IMAGE FORMINGAPPARATUS
4,827,278 A *
4,864,323 A *
5/1989 Lecheheb ........ ..
9/1989 Lecheheb et a1.
5,418,557
5/1995
.
(75)
US 8,567,928 B2
.
.
.
.
.
Inventors: Hlroshl Kotabe, H1tach1 (JP); Toshlhlde
A
*
12/1987 Erskine et a1. .................. .. 347/7
Pull
347/7
.. 347/78
.............. ..
347/7
6,003,965 A * 12/1999 AIWZI; et al‘
Nagamine, Toukai (JP); Akira Miyao,
Hitachi (JP)
(73) Assignee: Hitachi Industrial Equipment Systems
Co., Ltd., Tokyo (JP)
347/7
6,698,869 B2*
3/2004
Vosahlo ........... ..
7,475,974 B2 *
7,699,455 B2 *
l/2009 Matsuda et a1.
4/2010 Matsuda et a1.
8,425,018
B2 *
4/2013
Tomlin et a1.
8,439,489 B2 *
5/2013
Tomlin et a1. ................. .. 347/85
347/90
347/90
......
. . . ..
347/85
(Continued)
(*)
Notice:
Subject to any disclaimer, the term of this
patent is extended or adjusted under 35
U.S.C. 154(b) by 138 days.
EP
JP
(21) Appl.No.: 12/365,997
(22) Filed:
Videojet 43s Ink Jet Printer Service Manual P/N 361451-21 Revi
sion: AB, Apr. 2003*
Mar. 18, 2010
(Continued)
Foreign Application Priority Data
Sep. 17, 2008
9/2006
11/1998
OTHER PUBLICATIONS
Prior Publication Data
US 2010/0066790 A1
1700700 A2
10-296997 A
(Continued)
Feb. 5, 2009
(65)
(30)
FOREIGN PATENT DOCUMENTS
(JP) ............................... .. 2008-238182
Primary Examiner * Laura Martin
Assistant Examiner * Jeremy Bishop
(51)
Int. Cl.
B41] 2/1 75
B41] 2/165
(74) Attorney, Agent, or Firm * Kilpatrick ToWnsend &
Stockton LLP
(2006.01)
(2006.01)
B41] 2/02
(2006.01)
(57)
B41] 2/] 7
(52) US. Cl.
(2006.01)
A con?guration of an image display apparatus Which can
reduce a pump exclusive for solvent is provided. The image
display apparatus of the present invention is provided With an
USPC .................. .. 347/85; 347/22; 347/73; 347/84
(58)
ABSTRACT
Field of Classi?cation Search
ink chamber in an ink supply path from an ink container to a
USPC
printhead and a solvent chamber in a solvent supply path from
a solvent container to the printhead. The ink chamber and the
solvent chamber are formed by dividing a liquid chamber by
an elastic member (diaphragm), and volumes (capacities) of
the ink chamber and the solvent chamber are changed by a
pressure of the ink.
.......................................................... .. 347/ 85
See application ?le for complete search history.
(56)
References Cited
U.S. PATENT DOCUMENTS
4,334,838 A *
4,658,268 A *
6/1982 Fessler et a1.
4/1987
.. 417/395
Needham ........................ .. 347/7
8 Claims, 4 Drawing Sheets
47
33
US 8,567,928 B2
Page 2
(56)
References Cited
U. S. PATENT DOCUMENTS
OTHER PUBLICATIONS
European Patent Of?ce Search Report for application EP09001531.4
(Sep. 27, 2010).
2010/0220128 A1 *
9/2010 Zaba_et a1~ ~~~~~~~~~~~~~~~~~~~~~~ ~~ 347/6
Japan Patent Of?ce of?ce action for patent application JP2008
2010/0238243
2010/0220159 A1
Al *
9/2010 Tomlln
TOIIlllIl et
6t a1~
ill. ~~~~~~~~~~~~~~~~~ ~~ 347/93
347/85
Videojet
238182 1310 21,
Service Manual P/N361541-01 Rev AD (Nov. 2005).
FOREIGN PATENT DOCUMENTS
“Videoj et 1310 Ink Jet Printer,” New Equipment Digest Online Buy
er>s Guide (Jun, 2006)‘
2007-190725
8/2007
(Jul‘ 2006)‘
WO97/09176 Al
3/1997
WO00/68018 A1
11/2000
WO 2009047501 A1
4/2009
“Bar Codes Step Up to the Plate,” Pharmaceutical & Medical Pack
.
aging News, vol. 14, No. 11 (Nov.
2006).
.
.
.
Japan Patent Of?ce of?ce action for patent application JP2008
238182 (May 15, 2012)
“Videojet simpl?es coding operation,” In-PharmaTechnologist.com
JP
W0
WO
W0
W0
*
WO 2009049135 A1 *
WO 2009049140 A1 *
W0
WO 2009049141 A1 *
4/2009
W0
WO 2009049146 A1
*
4/2009
W0
4/2009
4/2009
* cited by examiner
US. Patent
FIG. 2
0a. 29, 2013
Sheet 1 of4
US 8,567,928 B2
US. Patent
0a. 29, 2013
Sheet 2 of4
US 8,567,928 B2
FIG. 3
13
i6.
372
26 54 22 43
2524
32
39
23 34 33
142
52 2127
23 2930 10
US. Patent
0a. 29, 2013
Sheet 3 of4
US 8,567,928 B2
FIG. 4
39
4s
40
4s
47
41
24
46
44
33
FIG. 5
45
41
47
46
44
24
as
US. Patent
Oct. 29, 2013
Sheet 4 of4
US 8,567,928 B2
FIG. 6
Control portion f 49
50
Operation display portion
28 \
30 \
Nozzle
Encoder
f 16
Print sensor
FN
f 29
De?ecting electrode
17 \
20
Charging electrode
1
-
irst e ectromagnetlc
Supplypump
rf
26
valve
Collecting pump
f 32
21 \ Second electromagnetic
valve
22 X Third electromagnetic
valve
Three-way switching f 27
electromagnetic valve
Viscosimeter
f 36
Recording portion
f 51
Depressurizing valve
f54
23 \ Fourth electromagnetic ‘
valve
38 \ Filth electromagnetic
valve
US 8,567,928 B2
1
2
INK DRIVEN SOLVENT PUMP FOR AN
IMAGE FORMING APPARATUS
solvent container, a check valve (may be an electromagnetic
valve) is provided. Also, the apparatus is con?gured such that
BACKGROUND OF THE INVENTION
When ink is not supplied, a space of the solvent chamber is
ensured by a repulsion force of a spring.
That is, the image display apparatus according to the
present invention is an image display apparatus for recording
(1) Field of the Invention
The present invention relates to an image display apparatus
and relates to improvement of the image display apparatus for
a print on a target article and is provided With a print head
having a noZZle for particulating and injecting ink, a charging
electrode for charging ink into ink particles, a de?ecting
electrode for de?ecting the charged ink particles, and a gutter
for capturing the ink particles not used for print, a main body
portion having an ink container for storing the ink, a supply
recording on a target article by injecting ink made into a
particle state and by forming an electric ?eld in a travel path
of charged ink particles so as to de?ect the ink particles, for
example.
(2) Description of the Related Art
The image display apparatus has a supply pump for sup
pump for supplying the ink to the print head, a solvent con
tainer for storing a solvent, a collecting pump for supplying
plying ink from an ink container to a noZZle, a collecting
the solvent from the solvent container to the ink container and
pump for discharging and particulating the ink from the
collecting the ink particles captured by the gutter in the ink
container, an operation control portion, and a liquid chamber,
and a motor for operating the supply pump and the collecting
noZZle and collecting it in the ink container as necessary, and
moreover, a pump exclusive for solvent, and main usages of
the pump exclusive for solvent are replenishment of a solvent
in order to avoid increase in concentration in the ink container
20
and noZZle cleaning at the end of ink injection.
As mentioned above, the image display apparatus is pro
supply path for supplying the ink from the main body portion
vided With a plurality of pumps as shoWn in JP Patent Publi
25
to the print head, a solvent path for supplying the solvent from
the main body portion to the print head, and a collecting path
for returning the ink particles captured in the gutter to the ink
30
betWeen the supply pump and the noZZle in the supply path,
While the solvent chamber is provided betWeen the solvent
container and the noZZle in the solvent path. The liquid cham
ber is divided by a member for relatively changing volumes of
cation (Kokai) No. 2007-190725, for example, and the plu
rality of pumps are driven at the same time by a single motor.
pump. Here, the liquid chamber has an ink chamber for tem
porarily storing the ink to be supplied to the print head and a
solvent chamber for temporarily storing the solvent. Also, a
They are driven together With the pump exclusive for solvent
all the time.
container are constituted. The ink chamber is provided
SUMMARY OF THE INVENTION
As shoWn in Patent Document 1, in the conventional image
the ink chamber and the solvent chamber by a pressure of the
display apparatus, the pump exclusive for solvent is mainly
ink supplied to the print head.
used for preventing increase in concentration of the ink by
replenishing the ink container With the solvent and for clean
ing the noZZle by the solvent.
HoWever, the pump exclusive for solvent is operated only
for approximately several minutes in order to clean the noZZle
Further features of the present invention Will be made
apparent from the best mode for carrying out the present
invention and the attached draWings.
According to the present invention, it is no longer required
35
to provide a motor exclusively for a pump exclusive for sol
vent, and siZe increase or cost rise can be solved. Also, a
once in 30 minutes in order to prevent increase in concentra
tion in the ink container. Therefore, though the solvent pump
does not have to be operated all the time, a load from the pump
exclusive for solvent is applied to the motor all the time and
the motor should consume unnecessary electric poWer. Also,
solvent pump for feeding from the solvent container to the
40
sumption fed to the motor, prevent siZe increase of the appa
ratus and loWer costs.
the pump exclusive for solvent is operating all the time, and
though it is not actually used, there is a possibility that its life
might end earlier, Which Would increase repair/replacement
BRIEF DESCRIPTION OF THE DRAWINGS
45
cost of the solvent pump. On the other hand, another motor
exclusive for a pump exclusive for solvent might be provided,
but it Would lead to increase in siZe of the apparatus and raise
These and other features, objects and advantages of the
present invention Will become more apparent from the fol
loWing description When taken in conjunction With the
accompanying draWings Wherein:
the cost.
That is, in the image display apparatus, if the number of
noZZle is no longer required, Which can reduce poWer con
50
FIG. 1 is a perspective vieW illustrating an appearance of a
pumps operated by a single motor can be reduced Without
main body and a print head of an image display apparatus.
increasing the number of motors, it is extremely advanta
geous in terms of design and operation.
image display apparatus.
FIG. 2 is a perspective vieW illustrating a use state of the
The present invention Was made in vieW of the above
circumstances and has an object to provide con?guration of
an image display apparatus that can reduce the number of
FIG. 3 is a diagram illustrating a path con?guration of the
55
FIG. 4 is a sectional vieW illustrating a state of a liquid
chamber during ink injection.
pumps as much as possible.
In order to solve the above problem, an image display
apparatus according to the present invention is provided With
an ink chamber in an ink supply path from an ink container to
a print head and a solvent chamber in a solvent supply path
from a solvent container to the print head. The ink chamber
and the solvent chamber are formed by dividing a liquid
chamber by an elastic member (diaphragm) so that volumes
(capacities) of the ink chamber and the solvent chamber are
changed according to a pressure of the ink. In order to prevent
back?oW of the solvent from the solvent chamber to the
image display apparatus according to the present invention.
FIG. 5 is a sectional vieW illustrating a state of a liquid
60
chamber before solvent injection.
FIG. 6 is a functional block diagram of the image display
apparatus according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENT
65
While We have shoWn and described several embodiments
in accordance With our invention, it should be understood that
US 8,567,928 B2
3
4
disclosed embodiments are susceptible of changes and modi
?cations Without departing from the scope of the invention.
Therefore, We do not intend to be bound by the details shoWn
and described herein but intend to cover all such changes and
modi?cations a fall Within the ambit of the appended claims.
An embodiment of the present invention Will be described
the ink 24 is opened, and the ink 24 is supplied to the noZZle
28 and it is made into the ink particle 10 at the noZZle 28. The
beloW referring to the accompanying draWings. However, it
and reaches onto the print target 13.
On the other hand, the ink particle 10 not charged by the
ink particle 10 is selectively charged by a charging electrode
29 on a rear stage, and the charged ink particle 10 receives a
de?ecting force in an electric ?eld formed by a de?ecting
electrode 30 on a further rear stage so as to ?y over a gutter 31
should be noted that the present embodiment is merely an
example for realiZing the present invention and does not limit
a technical scope of the present invention. Also, the same
reference numerals are given to common con?gurations in
charging electrode 29 goes straight through the electric ?eld
formed by the de?ecting electrode 30 and is captured by the
gutter 31 and returned to the ink container 25 by a collecting
pump 32. And to the path connecting the supply pump 26 and
the liquid chamber 42, a path connecting to the collecting
pump 32 is connected, and betWeen a connection point of the
each draWing.
<Appearance and Use State of the Apparatus>
FIG. 1 is a vieW illustrating an appearance con?guration of
path connecting the supply pump 26 and the liquid chamber
the image display apparatus according to the embodiment of
the present invention. An image display apparatus 100 is
provided With a main body portion 1 having an apparatus
display portion 3 and a print head 2, and the main body
portion 1 and the print head 2 are connected to each other by
a cable 4. Internal con?gurations of the main body portion 1
and the print head 2 Will be described later. On the apparatus
display portion 3, characters to be printed on a target article,
42 and a path in Which the collecting pump 32 is arranged and
the collecting pump 32, a depressuriZing valve 54 is arranged.
During stop processing of the image display apparatus 100
(during noZZle cleaning), the three-Way sWitching electro
20
magnetic valve 27 is in the non-excited state (excited state in
the case of a valve in Which the ink supply path side is opened
in the non-excited state) so that a supply path side of the
solvent 33 is opened and the solvent 33 is supplied to the
25
magnetic valve 27 and the noZZle 28, a path for sucking a
remaining liquid in the noZZle 28 at the noZZle cleaning and
for circulating the ink 24 is connected. This path is connected
to the collecting pump 32 through the cable 4 and in this path,
30
installed.
In order to replenish the ink container 25 With the ink 24, an
ink state, apparatus operating state and the like, for example,
noZZle 28. Also, betWeen the three-Way sWitching electro
are displayed.
FIG. 2 is a vieW illustrating an example of an actual use
state of the image display apparatus 100. The image display
apparatus 100 is installed in a production line in a plant Where
foods and drinks are produced, for example. The main body
portion 1 is installed at a position Where a user can Work,
While the print head 2 is installed at a position in proximity to
a pressure sensor 53 and a third electromagnetic valve 22 are
a print target 13 conveyed on a production line such as a belt
ink replenishment path constituted by the sub container 37
conveyer 15.
On the production line such as the belt conveyer 15, an
encoder 16 for outputting a signal according to a conveying
speed to the image display apparatus for printing in the same
Width regardless of the conveying speed and a print sensor 17
and the ?fth electromagnetic valve 38 in the main body por
tion 1 is connected to betWeen the ?rst electromagnetic valve
35
for detecting the print target 13 and outputting a signal
instructing print to the image display apparatus are installed,
and captured by the gutter 31 and supplied by the collecting
and each of them is connected to a control portion 49 (See
FIG. 6) in the main body portion 1.
40
The control portion 49 controls a charged amount and
charging timing to an inkparticle 10 discharged from a noZZle
according to the signals from the encoder 16 and the print
sensor 17 so that While the print target 13 passes in the vicinity
of the print head 2, the charged and de?ected ink particle 10
(see FIG. 3) is made to adhere to the print target 13 for print.
As shoWn in FIG. 3, the main body portion 1 has an ink
container 25, a viscosimeter 36, a ?rst electromagnetic valve
20, a supply pump 26, a liquid chamber 42, and a regulator 52
as a path for supplying ink 24 to a noZZle 28, and they are
connected in order. Also, the main body portion 1 has a sub
container 37 and a ?fth electromagnetic valve 38 as a path for
feeding the neW ink 24 to the ink container 25. The sub
container 37 and the ?fth electromagnetic valve 38 are con
nected betWeen a ?rst electromagnetic valve 20 and the sup
45
50
55
Also, as a path for supplying a solvent 33 to the noZZle 28,
a solvent container 34 and a second electromagnetic valve 21
60
opened in a non-excited state) so that the supply path side of
ment path is provided connecting the solvent container 34 and
the ink container 25 in the main body portion 1, and a fourth
the solvent container 34 and the ink container 25.
Also, in order to control concentration inside the ink con
tainer 25, the viscosimeter 36 is connected betWeen the ink
container 25 and the ?rst electromagnetic valve 20. The vis
cosimeter 36 controls viscosity so that an optimal set value is
set for print. That is, if it is determined that an ink concentra
tion measured by the viscosimeter 36 becomes higher than a
predetermined value, control is made so that the solvent 33 is
supplied from the solvent container 34 so as to adjust the
concentration of the ink.
Next, the liquid chamber 42 Will be described in detail. As
shoWn in FIG. 3, on the doWnstream side of the supply pump
26 in the main body portion 1 (the ink container side When
seen from the electromagnetic valve, the pump and the like is
de?ned as the up stream and the head side as the doWnstream),
the liquid chamber 42 provided With an ink chamber 39 and a
solvent chamber 40 is arranged. The ink chamber 39 is con
During apparatus operation, the three-Way sWitching elec
tromagnetic valve 27 is in an excited state (non-excited state
in the case of a valve in Which an ink supply path side is
pump 32 to the ink container 25. At this time, the ?rst elec
tromagnetic valve 20 is in a non-excited and closed state. That
is because the ink 24 is not pumped up from the ink container
25.
In order to prevent increase in concentration in the ink
container 25 and to replenish the solvent, a solvent replenish
electromagnetic valve 23 is installed in the path connecting
ply pump 26.
are provided, and they are connected in order. The both paths
are connected to a three-Way sWitching electromagnetic valve
27 of the print head 2 through the cable 4. And the three-Way
sWitching electromagnetic valve 27 serves to feed one of the
ink 24 and the solvent 33 to the noZZle 28.
20 and the supply pump 26. By the supply pump 26, the ink 24
in the sub container 37 is supplied to the noZZle, is made to ?y
over the charging electrode 29 and the de?ecting electrode 30
65
nected to the three-Way sWitching electromagnetic valve 27
through the regulator 52 and the cable 4. Also, betWeen the
solvent container 34 and the second electromagnetic valve 21,
US 8,567,928 B2
5
6
the solvent chamber 40 is installed. The solvent chamber 40 is
other hand, the third electromagnetic valve 22 and the fourth
connected to the second electromagnetic valve 21, and
betWeen the solvent chamber 40 and the solvent container 34,
a check valve (means for preventing solvent back?oW and
may be an electromagnetic valve) 43 is connected. The ink
chamber 39 and the solvent chamber 40 are partitioned by a
diaphragm 41 and con?gured so that liquid does not leak to
each other.
Subsequently, a method of replenishing the solvent in order
to prevent increase in concentration of the ink 24 in the ink
container 25 Will be described. During a printable state, since
the ?rst electromagnetic valve 20 and the three-Way sWitch
ing electromagnetic valve 27 are in the excited state, the ink
supply side is opened, and the ink 24 is supplied to the noZZle
electromagnetic valve 23 are controlled in the non-excited
state and closed. Also, the three-Way sWitching electromag
netic valve 27 is controlled in the excited state, the supply
path side of the ink 24 is opened, and the ink 24 is supplied
and injected to the noZZle 28.
In this case, in the liquid chamber 42, the ink 24 ?oWs from
the ink-in side port 44 to the ink-out side port 45, While since
the solvent 33 has the check valve on the upstream side of the
solvent-in side port 46 and the second electromagnetic valve
21 on the doWnstream side of the solvent-out side port 47 is
closed, there is no How.
When the image display apparatus 100 is stopped, the
diaphragm 41 is in the state as shoWn in FIG. 5. On the other
hand, at start-up processing of the image display apparatus
28. Thus, the other second electromagnetic valve 21, the third
electromagnetic valve 22, and the fourth electromagnetic
100, in order to clean the noZZle 28 and the like, the solvent in
the solvent chamber 40 is injected. As a result, the volume in
the solvent chamber 40 is reduced, and the diaphragm 41 is
displaced to the solvent chamber 40 side as shoWn in FIG. 4.
valve 23 are in the non-excited state and closed.
Also, at this time, the second electromagnetic valve 21 is in
the non-excited state and closed. Moreover, by the check
valve 43 connected to the upstream side of the liquid chamber
20
42, the solvent 33 on the doWnstream side from the check
valve 43 does not How out (back?oW) to the upstream side.
The solvent is replenished during printing. Therefore, the
?rst electromagnetic valve 20, the fourth electromagnetic
valve 23, and the three-Way sWitching electromagnetic valve
When the image display apparatus 100 is to be stopped, it
is necessary that, at the start-up of the image display appara
tus 100, the volume of the solvent chamber 40 should be
maximiZed in order to clean the noZZle 28 and the like by the
solvent 40, the diaphragm 41 is displaced to the ink chamber
25
39 side as shoWn in FIG. 5.
27 are in the excited state. The collecting pump 32 conducts
In a preparation state before the solvent 33 is injected, the
sucking only from the gutter 31 during usual printing, but
during the solvent replenishment, While the sucking from the
electromagnetic valves other than the three-Way sWitching
gutter 31 is continued, the solvent is also sucked from the
solvent container 34. In a path from the solvent container 34
through the fourth electromagnetic valve 23 to merge to a
collecting path, an appropriate diaphragm is needed so that a
solvent only to such a degree that ink collection from the
gutter 31 is not obstructed ?oWs during the solvent replenish
ment. In this Way, during the solvent replenishment, the
fourth electromagnetic valve 23 is opened, the solvent 33 in
the solvent container 34 ?oWs into the ink container 25 by the
collecting pump 32 so that increase in concentration of the ink
24 in the ink container 25 can be prevented.
<Con?guration and Status Change of Liquid Chamber>
30
spring 48 pressing the diaphragm 41 overcomes the pressing
force applied on the diaphragm 41 from the ink chamber 39,
35
Also, at this time, since the three-Way sWitching electro
magnetic valve 27 is opened, the ink particle 10 is injected
40
from the noZZle 28. HoWever, if the ink pressure in the ink
chamber 39 becomes too loW, the ink 24 injected from the
noZZle 28 departs from the gutter 31. In order to prevent such
an event, a pressure in the ink chamber 39 is measured by the
pressure sensor 53, and When the pressure sensor 53 detects
that the pressure in the ink chamber 39 has reached a rated
With an ink-in side port 44 and an ink-out side port 45 for
45
chamber 42 is provided With a solvent-in side port 46 and a
solvent-out side port 47 for ?oWing in/ out of the solvent 33.
In the solvent chamber 40, a spring 48 is provided at the
diaphragm 41, and an elastic force of the spring 48 is set, in its
movable range, smaller than a value obtained by multiplying
the diaphragm 41 is brought into a projecting state to the ink
chamber 39 by the spring 48 so that the solvent 33 can be
pumped up from the solvent container 34 and brought into the
state shoWn in FIG. 5.
FIG. 4 is a diagram illustrating a section of the liquid
chamber 42 in the printable state of the present invention.
The ink chamber 39 in the liquid chamber 42 is provided
?oWing in/out of the ink 24.
On the other hand, the solvent chamber 40 of the liquid
electromagnetic valve 27 are all in the non-excited state and
closed. At this time, if a pressing force to the diaphragm 41 of
the ink chamber 39 is loWered and the elastic force of the
value, a detection signal is transmitted to the control portion
49 in the main body. The control portion 49 excites and opens
the ?rst electromagnetic valve 20 and the second electromag
netic valve 21, brings the three-Way sWitching electromag
netic valve 27 into the non-excited state at the same time, and
50
controls such that the solvent path side is opened. At this time,
since the three-Way sWitching electromagnetic valve 27 has
a pressure of the ink When the ink is supplied to the ink
the solvent path side in the open state and moreover, the ?rst
chamber 39 by closing the ink supply side of the three-Way
sWitching electromagnetic valve 27 (maximum pressure that
electromagnetic valve 20 is opened, the inside of the ink
chamber 39 is pressuriZed. On the other hand, the solvent 33
in the solvent chamber 40 does not How (back?oW) into the
the supply pump can output) by a pressure-receiving area
55
receiving the pressure of the diaphragm (the solvent in the
solvent container 34 oWing to the check valve 43 on the
solvent-in side port 46 but ?oWs into the noZZle 28 and has the
solvent injected so that the noZZle 28 is cleaned. After the
solvent chamber can be pushed out When the ink chamber is
pressurized at the maximum). As a component having an
action to change the siZe of the ink chamber 39 and the solvent
chamber 40 by the liquid pressure, the diaphragm 41 is used
noZZle cleaning, the liquid remaining in the noZZle 28 and the
like is sucked and collected since all the electromagnetic
herein, but not limited to that, any alternative may be used as
long as the similar action can be exerted.
valves other than the third electromagnetic valve 22 are
closed. If the apparatus is in the stop state in this Way, since the
While the ink is injected from the noZZle, the electromag
netic valve in the path for supplying the ink 24 is such that the
?rst electromagnetic valve 20 is excited and opened, While in
pressure in the path is drained, the liquid chamber is brought
into the state shoWn in FIG. 5.
65
Next, an operation of the liquid chamber 100 Will be
the path for supplying the solvent 33, the second electromag
described in terms of a relation With an operation of each
netic valve 21 is in the non-excited state and closed. On the
portion in the image display apparatus 100. FIG. 6 is a block
US 8,567,928 B2
7
8
diagram illustrating functional con?guration of the image
As mentioned above, there is no need to provide an exclu
sive motor for a pump exclusive for solvent, siZe or cost is not
increased, a solvent pump for feeding a solvent from the
solvent container to the noZZle is no longer needed, poWer
consumption to be fed to the motor can be reduced, the siZe of
the apparatus is not increased, and the cost can be reduced.
display apparatus 100 according to an embodiment of the
present invention.
The image display apparatus 100 is provided With the
control portion 49 con?gured by an MPU and the like, for
example. The control portion 49 controls each portion of the
noZZle 28, the de?ecting electrode 30, the print sensor 17, the
?rst electromagnetic valve 20, the second electromagnetic
valve 21, the third electromagnetic valve 22, the fourth elec
tromagnetic valve 23, the ?fth electromagnetic valve 38, the
Alternatively, an electromagnetic valve instead of the
check valve may be provided betWeen the liquid chamber 42
and the solvent container 34. Alternatively, the check valve
may be integrated With the solvent-in side port 46 of the liquid
chamber 42.
<Conclusion>
operation display portion 3, the charging electrode 29, the
encoder 16, the supply pump 26, the collecting pump 32, the
In this embodiment, the ink chamber is provided betWeen
the supply pump and the noZZle, and the check valve and the
three-Way sWitching electromagnetic valve betWeen the sec
ond electromagnetic valve and the print head are connected in
order from the solvent container to the print head. Also, the
solvent chamber is provided betWeen the check valve and the
second electromagnetic valve, an elastic material is sand
viscosimeter 36, the three-Way sWitching electromagnetic
valve 27, and a recording portion (memory) 51 and the like
through a bus line 50.
In the recording portion 51, a program for controlling each
portion of the image display apparatus 100 is stored. The
control portion 49 controls the operation of each portion
constituting the image display apparatus 100 on the basis of
20
the program.
When a user carries out stop processing of the image dis
play apparatus 100, the control portion 49 ?rst turns off the
?rst to fourth electromagnetic valves 20 to 23 in order to
increase the volume of the solvent chamber 40 and then, turns
25
on the three-Way sWitching electromagnetic valve 27. If each
electromagnetic valve is controlled in this Way, the pressure in
the ink chamber 39 is loWered. At this time, the control
portion 49 determines if the pressure in the ink chamber 39
has reached a rated value or not using the pressure sensor 53.
If the control portion 49 determines that the pressure in the ink
chamber 39 has reached the rated value, the volume of the
solvent chamber 40 is considered to become the maximum,
and an operation is changed to that of a solvent injection state.
The control portion 49 turns on the ?rst electromagnetic
valve 20 and the second electromagnetic valve 21 in order to
carry out the solvent injection processing, and turns off the
30
second electromagnetic valve.
During the printable state, the ink ?oWs through the ink
chamber, and since the path ahead of the solvent-in side port
and the solvent-out side port of the solvent chamber is closed
by the check valve and the second electromagnetic valve, the
volumes in the ink chamber and the solvent chamber are
hardly changed.
35
HoWever, as a stage prior to solvent injection, by closing
the ?rst electromagnetic valve located betWeen the ink con
tainer and the supply pump, the pressure in the ink chamber is
third electromagnetic valve, the fourth electromagnetic valve
23, and the three-Way sWitching electromagnetic valve 27.
That is, the control portion 49 excites and opens the ?rst
Wiched betWeen the ink chamber and the solvent chamber so
that the solvent chamber side is projected, and moreover, the
spring is provided in the solvent chamber and installed per
pendicular to the elastic material. The ink-in side port of the
ink chamber is connected to the supply pump, While the
ink-out side port is connected to the noZZle. Also, the solvent
in side port in the solvent chamber is connected to the check
valve, While the solvent-out side port is connected to the
loWered, and With that, the spring in the solvent chamber is
extended. Also, since the valve connected to the solvent-in
40
electromagnetic valve 20, brings the three-Way sWitching
side port serves as the check valve and sucks the solvent from
electromagnetic valve 27 into the non-excited sate and opens
the solvent container, the volume of the solvent chamber is
increased, and the elastic material projects toWard the ink
the solvent path. Then, since the supply path side is pressur
iZed by the supply pump 26, With increase in the volume of the
ink chamber 39 in the liquid chamber 42, the diaphragm 41 is
chamber. At the same time When the pressure in the ink
chamber drops beloW a rated pressure, a signal is sent to the
control portion of the apparatus so as to pressuriZe the ink
displaced to the solvent chamber 40 side, the solvent 33 in the
solvent chamber 40 is pushed out to the noZZle 28, and the
solvent 33 is injected from the noZZle 28.
Subsequently, the control portion 49 executes the suction
processing in the noZZle and paths. In this case, only the third
electromagnetic valve 22 is turned on, While the other elec
45
chamber again, and the elastic material is brought into a
doWnWard projecting state to the ink chamber so that the
solvent ?oWs into the noZZle.
50
tromagnetic valves are off. And the image display apparatus
100 is controlled to the stop state.
After that, by opening the depressuriZing valve 54, a
depressuriZing processing in Which a remaining pressure in
the path connecting the collecting pump 26 and the electro
magnetic valve 27 is extracted into the ink container 25
through the collecting pump 32 is carried out, and the remain
ing pressure in the ink chamber 39 is reduced so that the
spring 48 in the solvent chamber 40 overcomes the pressure
there is no need to use a motor exclusive for solvent supply,
55
60
from the ink chamber 39, the diaphragm 41 is gradually
displaced to the ink chamber 39 side, and the liquid chamber
the scale of the apparatus can be made small and an image
display apparatus contributing to cost reduction can be pro
vided.
The present invention can be also realiZed by a program
code of softWare that realiZes functions of the embodiment. In
this case, a recording medium recording the program code is
provided for the system or the apparatus, and a computer (or
42 is brought into a state as shoWn in FIG. 5. And in the course
during Which the diaphragm 41 is displaced to the ink cham
ber 39 side, the solvent 33 is sucked out of the solvent con
tainer 34. As a result, the solvent chamber 40 is ?lled With the
solvent 33.
As being con?gured as above, a solvent pump for supply
ing solvent, driven by a motor, can be reduced, a poWer
consumption to be fed to the motor can be reduced, the siZe of
the apparatus is not increased, and a cost can be reduced. Also,
since the solvent supply is realiZed Without using a motor,
65
CPU or MPU) of the system or the apparatus reads out the
program code stored in the recording medium. In this case,
the program code itself read out of the recording medium
realiZes the above-mentioned functions of the embodiment,
and the program code itself and the recording medium storing
it constitute the present invention. Recording mediums for
US 8,567,928 B2
10
provided betWeen said supply pump in said supply path
and said noZZle, said solvent chamber being provided
supplying such a program code include, for example, ?oppy
(registered trademark) disk, CD-ROM, DVD-ROM, hard
disk, optical disk, magneto-optic disk, CD-R, magnetic tape,
betWeen said solvent container in said solvent path and
said noZZle, and said liquid chamber being divided by a
member Which relatively changes volumes of said ink
chamber and said solvent chamber by a pressure of the
non-volatile memory card, ROM and the like.
Also, it may be so con?gured that on the basis of an instruc
tion of the program code, OS (operating system) running on
the computer executes a part of or the Whole of the actual
processing so that the functions of the above-mentioned
ink supplied to said print head, said member is con?g
ured to be displaced responsive to an increase of the
pressure of the ink so that the ink can be supplied to said
noZZle, the supply of the ink and the solvent to the noZZle
is con?gured to be sWitched over by transition of the
embodiment are realiZed by the processing. Moreover, it may
be so con?gured that after the program code read out of the
recording medium is Written in a memory of the computer, on
the basis of the instruction of the program code, the CPU of
the computer and the like executes a part of or the Whole of the
actual processing so that the functions of the above-men
member; and
Wherein said member is in a state Where a diaphragm
member is displaced at a position closest to the side of
tioned embodiment are realiZed by the processing.
Also, it may be so con?gured that the program code of the
softWare that realiZes the functions of the above-mentioned
embodiment is delivered through a netWork and stored in
storage means such as a hard disk, memory or the like in the
system or the apparatus or in a recording medium such as a
CD-RW, CD-R or the like so that the program code stored in
the storage means or recording medium is read out and
said ink chamber When a printing operation is stopped.
2. The image forming apparatus according to claim 1,
20
on said noZZle side.
3. The image forming apparatus according to claim 2,
executed by the computer (or CPU or MPU) of the system or
the apparatus at use.
What is claimed is:
1. An image forming apparatus for recording a print on a
25
5. The image forming apparatus according to claim 2,
30
6. The image forming apparatus according to claim 2,
Wherein a check valve or said electromagnetic valve is pro
35
solvent container to said ink container and collects the
an operation control portion, and a liquid chamber; and
40
ing Pump;
Wherein said liquid chamber has an ink chamber Which
and a solvent chamber Which temporarily stores said
gutter to said ink container, said ink chamber being
7. The image forming apparatus according to claim 1,
Wherein said operation control portion controls opening/clos
path in a printable state so that ink supply to said ink chamber
is enabled and solvent supply to said solvent chamber is
stopped and controls opening/closing of the valve provided at
said supply path and said solvent path in a solvent injectable
state so that the ink supply to said ink chamber is stopped and
the solvent supply to said solvent chamber is enabled.
temporarily stores ink to be supplied to said print head
ing path Which returns said ink particle captured by said
vided integrally at said solvent-in side port.
ing of a valve provided at said supply path and said solvent
ink particle captured by said gutter in said ink container,
solvent and is constituted by a supply path Which sup
plies said ink from said main body portion to said print
head, a solvent path Which supplies said solvent from
said main body portion to said print head, and a collect
Wherein an electromagnetic valve is provided betWeen said
solvent-in side port and said solvent container in said solvent
path.
collecting pump Which supplies said solvent from said
a motor Which operates said supply pump and said collect
4. The image forming apparatus according to claim 2,
side port and said solvent container in said solvent path.
particle not used for printing;
a main body portion having an ink container Which stores
said ink, a supply pump Which supplies said ink to said
print head, a solvent container Which stores a solvent, a
Wherein said liquid chamber is divided by a diaphragm so as
to form said ink chamber and said solvent chamber.
Wherein a check valve is provided betWeen said solvent-in
target article, comprising:
a print head having a noZZle Which injects ink in a particle
state, a charging electrode Which charges said ink into
the ink particle, a de?ecting electrode Which de?ects the
charged ink particle, and a gutter Which captures the ink
Wherein said liquid chamber has an ink-in side port on said
supply pump side of said ink chamber, an ink-out side port on
said noZZle side, a solvent-in side port on said solvent con
tainer side of said solvent chamber, and a solvent-out side port
45
8. The image forming apparatus according to claim 7,
Wherein said operation control portion determines if it is in
said solvent injectable state or not based on Whether the
pressure inside said ink chamber is not more than a predeter
mined value or not.
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