close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3059624

код для вставки
Oct. 23, 1962
w. LIMBERGER
3,059,514
DEVICE FOR DEVELOPING A LATENT ELEcTRosTATIc IMAGE
/f////f
n
x
.
uf.
f
,_ _5_ _
6
„lll/177
39
35
F719' 2
43 42
36
35
/NVENTO P:
WALTER LmßEReER
By /
@m
AGEA/T
United States VPatent O ” ice
3,059,614
Patented Oct. 23, 1962
2
ple, guide rollers that are arranged as the guide means
f
., 3,059,614
in the toner accumulation.
-
DEVICE FOR DEVELOPING A LATENT
- .
,
In a particularly preferred embodiment, stirring devices
ELECTROSTATIC IMAGE
tare provided in the toner collected in the container, which
have the form for example of paddle wheels or stirring
rollers. The direction of rotation of several stirring de
WalterLimberger, Hamburg, Germany, assignor to
Lumoprint Zindler K.G., Hamburg, Germany, a com
pany of Germany
’
v
-
l
.
vices arranged successively in the direction of advance
of the layer support may be the same. Preferably, the
Original application June 27,'1957, Ser. No.v 668,528, now
Patent No. 2,972,331, dated Feb. 21,1961, Divided
and this application June 24, 1959-, Ser. No. 827,671
direction of rotation is so chosen that the sides of the
Claims priority, application IGermany June 29, 1956
10 stirrer devices facing the layer support move parallel to
S Claims. '(Cl. 118-637)
the direction of advance.
Within the scope of the invention is an embodiment
This application is a division ofmy cio-pending U.S.
in which a contrary direction of rotation of the separate
application Serial No. 668,528,5fìled June 27, 1957, and
stirrer devices is chosen. The purpose of the stirrer de
_
'
The invention relates to a ldevice for preparing an irn 15 vices is to provide agitation of »the toner on the side of
now U.S. Patent No.- 2,972,331.`
the layer support provided with the xerographic layer,
age on ay xerographic layer support by producing the
latent electro-static image by illuminating through an ob
jective or by a ¿contactfmethod and by developing this
so that new particles of the toner are continually directed
onto the Xerographic layer. The stirring can be used,
‘ by means of a corresponding arrangement of the stirring
image, so that the layer Vsupport is guided through a
toner, whereupon the pigment _particles carried on the 20 devices or also by a corresponding positioning of the
latent imagetare fused in.
blades arranged on the stirrer rollers, at the same time,
'
to effect removal of the consumed toner and a corre
sponding supply of new toner. Precautions are taken,
According to known methods for developing a latent
electrostatic image in’ a xerographic layer, the image is
rendered visible with pigment particles. ' These pigment
for example, by suitable guides, so that the consumed
the small size of a carrier of the pigment particles, is vpul
verulent. The _application iseifected in the known meth
an apparatus in which the section of the apparatus re
ceiving the container for the toner can be enclosed With
particles are carried by vvery small glass or qu'artz'spheres 25 toner is moved to the part of the container which is at
the «back of the layer support.
or ironfìlings. The spheres orñlings form with the pig
The construction according to the invention provides
ment particles lthe vso-called- ‘,‘toner”` which, because of
ods and devices by,> `distributing the toner on thexero 30 respect to other sections of the container by an inter
mediate Wall, which is interrupted only by slots for the
graphic
layer.
`
'
v
'
'
.
passage of the layer support. In a preferred embodiment
of the invention, the container receiving the toner is ar
advantages, since a uniform,- distribution of the toner with
ranged in the lower part of the apparatus. Directly above
a distributing deviceis difficult, even -if a very heavy dis
35 the intermediate Wall enclosing this lower part there is
tribution is carried out.
.
`
located the illuminating device, in front of which, with
There is also the v.disadvantage that a> large amount
reference to the direction of advance of the layer support,
of the toner is removed from thelayerand must be col
a forming or developing device is arranged. Preferably,
lected. An _additionalvortex formation of the coated
the forming device and the drive motor for the moving
powder occurs, ._so thatv the> use of enclosed apparatus is
coupled with considerabledisadvantages.\ Apart from 40 parts are arranged within a housing chamber which is
f This known application procedure'hassubstantial dis
the soiling of otherparts of theapparatus, an effective
tightly sealed.
cooling in the directproximity'fofzthe distributing device
cannot be carried out, since a'cooling-air supply Iadverse
which the layer support is withdrawn from the toner
ly affects the distribution on the Xerographic layer. Con
sequently, the known devices must be constructed rela
tively large by dividingïthe apparatus into several sec
tions, whereby furtherîdifiiculties arise in the transport
Above the container for the toner, on the side at
container, there is located a chamber for a brush and/or
45 a disc and/or a nozzle for cleaning the back of the layer
support.
A particularly advantageous construction of the appara
tus is given in that the xerographic layer support is guided
of the layer support. >Moreover, the toner needs to be
rapidly distributed on the xerographic‘ layer and requires
to «be shaken ontor‘this layer.
l,
`
from a supply roll vertically downwards into the toner
The layer sup
port is drawn vertically upwards from the toner container
50' container in which it runs horizontally.
The invention is.directed'to the problem of avoiding
these disadvantages of _known methods andA apparatus
and of providing .a device which permits the preparation
and, after passing through the heating device, is wound
onto a receiving roll.
Further advantages and features of the invention will
tremely small spatial dimensions, so,v that it can be con 55 appear from the following description of the embodiment
illustrated in the drawing. In the drawing:
structed `as a table device. l
of an image ona xerographic layer support and has ex
This problem ,is`> solved in accordance with the inven
tion in that the layer supportrwithv the electrostatic image
is not Ásupplied with the toner, but is passedv through an '
FIG. 1 shows a vertical section through a device ac
cording to the invention; and
FIG. 2 shows a section through the device of FIG. 1
accumulation of the toner. By. this, all .disadvantages 60 on the line II-IL
The device illustrated in the drawing consists essential
which flow from distribution are avoided. and, at the
ly of an upper part 24 and a lower part 25 which are sep
same time, a uniform and thick covering of the electro
arated from one another by an intermediate wall 26. The
static image with pigment particles is ensured in a particu
intermediate wall is interrupted only by slots 27 and 28
larly advantageous way, without rapid consumption of
65 for the passage of the layer support 29. Directly ad
jacent the slot 28 there is located a further opening 30
The problem ywhich is the basis of the invention is
which is preferably merely an enlargement of the slot 28
further solved by an apparatus in which guide means for
and serves for the removal of pigment particles.
the layer support are- provided withinthertone‘." accumula
In the lower part 25 a container 31 is arranged which
tion in the receptacle containing an accumulation of the 70 is ñlled with the toner 32. Conveying devices 33 and 34,
for example in the form of rotating rollers, are arranged
These guide means comprise rotating parts. for exam
within the toner, around which the layer support 29 is
the
toner.
toner.
-.
„
y
`
.
~
`
`
f
_
3,059,614
of the upper part of the apparatus so that the heat de
guided. In a preferred construction, the conveying de
vices 33, 34 consist of several wheels 35 or 36 spaced over
veloped can readily escape.
the width of the layer support 29 on axles 37 and 38.
whose length corresponds to the width of the layer sup
port. The brush 58 is arranged adjacent of the back
of the layer support, namely at the side which »is not
The brush 58 is constructed in the form of a rollet-
The layer support is guided with its back over the con
veying devices 33 and 34, so that the xerographic layer 1s
not damaged by contact with the conveying devices.
provided with the xerographic layer, and serves to loosen
Stirring devices 39, 40, 41 are arranged in the container
pigment particles which adhere to the back of the layer
31 within the toner in front of the side of the Xerographic
support. These pigment particles are directed by the
layer support 29 with the xerographic layer, which cause
a continuous stirring of the toner coming into contact 10 brush, which has a direction of advance opposed to the
direction of advance of the layer support, into an open
with the Xerographic layer, so that the supply of pigment
ing 30 through which they fall into the container 31.
particles to the xerographic layer is ensured.
The wall 60 of the container provided adjacent the brush
In the embodiment illustrated, the stirring devices 39-41
58 is inclined downwardly, so that it guides the freed
are constructed as stirring rollers whose axes run paral
lel to the axles 37 and 38 of the conveying devices. The 15 pigment particles suspended in the brush chamber to the
opening 30 as ~they sink. The width of the chamber re
invention includes embodiments in which the axes of the
ceiving the brush corresponds exactly to the width of
stirring rollers run at an angle to the direction of advance
the layer support 29 so that the pigment particles freed
of the layer support 29. In special cases, the provision of
from the back of the layer support cannot pass to the
stirring surfaces on the stirring rollers is preferred in order
to augment the agitation of the toner in a predetermined 20 front of the layer support. For example, on the side
walls of the brush chamber, guides or guide rods are
direction. For example, this can be done by arranging that
-arranged which cover the slots between the side wall
the toner particularly in the middle of the container 31,
and the edge of the layer support 29‘.
that is in the region of the stirring devices 40, is directed
The heating device 59 can be constructed as an infra
beneath the layer support 29 toward the longitudinal walls
of the container 31, so that the exertion of pressure in 25 red radiator or, as shown in the embodiment illustrated,
as a resistance heater, which is arranged in front of
the region of the longitudinal walls by the passage through
the xerographic layer. The rollers guiding the layer
the toner, which is located above the layer support 29 in
the container 31, is prevented by the gap 42 between the
longitudinal wall 43 of the container 31 and the edge of the
layer support 29.
Above the intermediate Wall 26, the housing is divided
by a horizontal partition 63 and a vertical partition 64 into
several chambers, of which one chamber receives the sup
ply roll 44 with the xerographic-layer support. In a fur
support 29 in front of the heating device 59 are indicated
at 61 and 62.
30
Preferably, the chamber receiving the supply roll 44
is open, so that the particular amount supplied can be
observed. All other chambers of the apparatus are
enclosed, the walls being merely provided with the req
uisite slots for the passage of the layer support. The
belt drives 46-48 preferably run outside the chambers
ther chamber, the central drive motor 45 is arranged by
described and are enclosed in covers.
which, for example, by means of belt drives 46, 47, 48, all
What I claim is:
moving parts of the apparatus are driven. In the chamber
1. A device for developing, by contact with a gran
receiving the drive motor 45, the forming device 49 for the
ular toner, a latent electrostatic image on a ñexible car
Xerographic layer is also provided. This forming de
vice consists in the embodiment shown of several electrode 40 rier having a xerographic layer, comprising feeder means
for said carrier, a receptacle below said feeder means
wires 50 in front of the xerographic layer and an elec
adapted to be tilled to a predetermined level with said
trode plate 51 behind the xerographic layer. In the direc
toner, guide means within said receptacle forming a path
tion of advance of the layer support 29, which is indicated
by the arrow 52, an illuminating device 53 is located be
for said carrier, take-up means for said carrier posi
hind the forming device 49 which in the embodiment 45 tioned above said receptacle, said path haivng a descend
ing branch extending from said feeder means to said
shown consists of a tube in which an objective 54 is pro
guide means, a substantially horizontal branch extend
vided. The invention also includes constructions in which,
instead of the illuminating device 53 shown, the contact
ing through an accumulation of said toner below said
method is used for preparing the latent electrostatic image.
level, and an ascending branch extending from said
The division of the apparatus into separate chambers 50 guide means to said take-up means, forming and ex
and the arrangement of moving parts operating on the
posure means for said xerographic layer adjacent said
xerographic layer is so arranged that the xerographic-layer
descending branch heating means adjacent said ascend
support is guided with the least possible bending from the
ing branch for fusing adhering toner particles to said
supply roll 44 to the roll 55. In the preferred embodi
carrier, and agitating means positioned adjacent said
ment, in which the container 31 is arranged in the lower
ascending- branch for removing loosely adhering toner
part of the apparatus, the layer support 29 is drawn ver
particles from said carrier and means for returning re
tically downwards from the supply roll 44 arranged ‘at one
moved particles to said receptacle.
side of the apparatus in the upper part thereof by the con
2. A device for developing, by contact with a granular
veyor rollers 56 and 57 and in this direction is guided with
toner, a latent electrostatic image on a flexible carrier
out bendingto the conveying device 33 within the con 60 strip having a xerographic layer, comprising a hous
tainer 31. In the container 3l, the layer support runs
ing; substantially horizontal partition means dividing said
horizontally' and is turned through 90° at the end of the
housing into a lower and an upper compartment, said
container and is led vertically upwards into a chamber in
partition means being provided with two parallel slots;
which a rotating brush 58 is arranged. Above this cham
an upwardly open receptacle in said‘lower compart
ber is located the heating device 59 for fusing the pigment
ment overlain by said partition means and adapted to be
65
particles into the xerographic layer. In front of the
filled to a predetermined level with said toner; first and
heating device 59, the layer support is again turned through
second roller means in said receptacle rotatable about
90° and after it has passed through the heating device
parallel axes and positioned in substantially vertical pe
59 is guided downwardly to the roll 55. By this guiding
ripheral alignment with said slots, respectively, said
of the layer support there is afforded, with small dimen
roller means being disposed at substantially the same
70
sions of the apparatus, a large travel of the layer support
height and lying each at least partially below said level;
through the toner 32 located in the container 31 and the
supply means for said carrier strip in said upper com
possibility is also obtained of guiding the layer support,
partment; third roller means positioned in said upper
after the forming of the xerographic layer, merely on its
compartment between said supply means and said parti
rear side. At the same time, the effect is also obtained
that the heating device lies in a chamber at the upper side 75 tion means in substantially vertical peripheral alignment
3,059,614
5
6
with said first roller means and with one of said slots,
means; third roller means positioned in said upper com
thereby defining a substantially vertical descending path
partment between said supply means and said partition
means in substantially vertical peripheral alignment with
for said carrier through said one of said slots, said
first and second roller means defining a substantially hori
said first roller means and with one of said slots of each
zontal path for said carrier strip through said toner; form
pair, thereby defining a substantially vertical decending
ing and exposure means for said xerographic layer in
path for said carried through said one of said slots, said
first and second roller means defining a substantially
said upper compartment adjacent said descending path;
take-up means for said carrier strip in said upper com
horizontal path for said carrier strip through said toner;
partment; fourth roller means positioned in said upper
forming and exposure means for said Xerographic layer
compartment between said take-up means and said parti 10 in said intermediate compartment adjacent said descend
tion means in substantially vertical peripheral align
ment with said second roller means and with the other
of said slots, thereby defining a substantially vertical
ascending path for said carrier through said other of
said slots; and drive means for actuating said take-up
means.
3. A device for developing, by contact with a granu
ing path in facing relationship with one side of said
carrier strip; take-up means for said carrier strip in said
housing above said lower partition means; fourth roller
means positioned in said upper compartment between
said take-up means and said partition means in substan
tially vertical peripheral alignment with said second roller
means and with the other of said slots of each pair, there
lar toner, a latent electrostatic image on a flexible car
by defining a substantially vertical ascending path for said
rier strip having a xerographic layer, comprising a hous
carrier through said other of said slots; rotating brush
ing; substantially horizontal partition means dividing 20 means in said intermediate compartment positioned ad
said housing into a lower and an upper compartment,
jacent said ascending path along the other side of said
said partition means being provided with two parallel
carrier strip for removing adherent particles therefrom;
slots; an upwardly open receptacle in said lower com
drive means for actuating said takeup means; heating
partment overlain by said partition means and adapted
means in said upper compartment above said brush means
to be filled to a predetermined level with said toner; 25 for fixing a xerographic image on said layer; and substan
first and second roller means in said receptacle rotatable
tially vertical partition means in said housing in at least
about parallel axes and positioned in substantially ver
said intermediate compartment separating said brush
tical peripheral alignment with said slots, respectively,
means from said forming and exposure means.
said roller means being disposed at substantially the same
5. A device for developing, by contact with a granular
height and lying each at least partially below said level; 30 toner, a latent electrostatic image on a flexible carrier
supply means for said carrier strip in said upper com
strip having a Xerographic layer, comprising a housing;
partment; third roller means positioned in said upper
substantially horizontal partition means dividing said
compartment between said supply means and said par
housing into a lower and an upper compartment, said
tition means in substantially vertical peripheral align
partition means being provided with two parallel slots; an
ment with said first roller means and with one of said 35 upwardly open receptacle in said lower compartment over
slots, thereby defining a substantially vertical descend
ing path for said carrier through said one of said slots,
said first and second roller means defining a substan
tially horizontal path for said carrier strip through said
lain by said partition means and adapted to be filled to a
predetermined level with said toner; first and second roller
means in said receptacle rotatable about parallel axes
and positioned in substantially vertical peripheral align
toner; forming and exposure means for said Xerographic 40 ment with said slots, respectively, said roller means being
layer in said upper compartment adjacent said descend
disposed at substantially the same height and lying each
ing path in facing relationship with one side of said
at least partially below said level; means including a
carrier strip; take-up means for said carrier strip in said
supply reel for said carrier strip positioned in said upper
upper compartment; fourth roller means positioned in
compartment and defining a substantially vertical de
said upper compartment between said take-up means 45 scending path for said carrier through one of said slots,
and said partition means in substantially vertical pe
said first and second roller means defining a substantially
ripheral alignment with said second roller means and
horizontal path for said carrier strip through said toner;
with the other of said slots, thereby defining a substan
forming and exposure means for said xerographic layer in
tially vertical ascending path for said carrier through
said upper compartment adjacent said descending path;
said other of said slots, rotating brush means in said 50 means including a take-up reel for said carrier strip posi
upper compartment positioned adjacent said ascending
tioned in said upper compartment and defining a substan
path along the other side of said carrier strip for re
tially vertical ascending path for said carrier through
moving adherent particles therefrom; drive means for
the other of said slots; heating means in said upper com
actuating said take-up means; and substantially vertical
partition means in said upper compartment separating
said brush means from said forming and exposure means.
4. A device for developing, by contact with a granular
toner, a latent electrostatic image on a flexible carrier
strip having a xerographic layer, comprising a housing:
substantially horizontal lower and upper partition means 60
dividing said housing into a lower, and intermediate and
partment adjacent said ascending path between said take
up reel and said partition means for fusing adhering toner
particles to said carrier; and drive means for rotating
said take-up reel.
References Cited in the file of this patent
UNITED STATES PATENTS
an upper compartment, said partition means being each
provided with a pair of parallel slots; an unwardly open
receptacle in said lower compartment overlain by said
2,221,776
2,338,266
2,340,897
Carlson _____________ __ Nov. 19, 1940
Skoning _______________ __ Ian. 4, 1944
Pierson ________________ _... Feb. 8, 1944
lower partition means and adapted to be filled to a pre 65
determined level with said toner; first and second roller
means in said receptacle rotatable about parallel axes and
2,348,166
2,676,899
2,761,416
Cavanaugh et al ____ __-__.___ May 2, 1944
Hackley ______________ -_ Apr. 27, 1954
Carlson ______________ __ Sept. 4, 1956
positioned in substantially vertical peripheral alignment
2,826,168
Grant ______________ __ Mar. ll, 1958
with said slots, respectively, said roller means being dis
posed at substantially the same height and lying each at 70
least partially below said level; supply means for said
2,832,511
2,851,373
2,919,672
Stockdale et al _________ __ Apr. 29, 1958
Tregay et al ___________ __ Sept. 9, 1958
Benn et al. ____________ __ Jan. 5, 1960
carrier strip in said housing above said lower partition
Документ
Категория
Без категории
Просмотров
0
Размер файла
651 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа