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Патент USA US3067730

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1386- 11,‘ 1962
3,067,720
w. G. LEWIS El'AL
XEROGRAPHIC DEVELOPING APPARATUS
Filed Dec. 23, 1960
5 Sheets-Sheet 1
Y
INVENTORS.
WILLIAM G. LEWIS
JOHN w. WAGNER
ATTORNEY
Dec. 11, 1962
3,067,720
w. G. LEWIS ETAL
XEROGRAPHIC DEVELOPING APPARATUS
Filed Dec. 23, 1960
5 Sheets-Sheet 2
@QN
2:
_ _ _ _*_ _ _
;
BY
INVENTORS.
WILLIAM G. LEWIS
JOHN W. WAGNER
k/nru/
A TTO R N EY
Dec. 11, 1962
w. G. LEWIS EI'AL
3,067,720
XEROGRAPHIC DEVELOPING APPARATUS
Filed Dec. 25, 1960
5 Sheets-Sheet 3
BY
FIG. 9
_
INVENTORS.
WILLIAM G. LEWIS
JOHN W. WAGNER
A TTORN E Y
Dec. 11, 1962
w. G. LEWIS ETAL
3,067,720
XEROGRAPHIC DEVELOPING APPARATUS
Filed Dec. 25, 1960
5 Sheets-Sheet 4
IN VEN TORS.
WILLIAM G. LEWIS
JOHN W_ WAGNER
ATTORNEY
Dec. 11, 1962
w. G. LEWIS EI'AL
3,067,720
XEROGRAPHIC' DEVELOPING APPARATUS
Filed Dec. 23, 1.960
5 Sheets-Sheet 5
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United States Patent Q "ft@@
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3,967,726
'XERQGRAIPHIC DEVELQi’liN-G APPARATUS
Wiiliam G. Lewis, Rochester, and Ziohn W. ‘Wagner, Pen
?eld, N.Y., assignor to Xerox Corporation, a corpora
tion of New York
Filed Dec. 23, 196i),
3 Clain .
3,667,?2h
Fatented Dee. ll, 1962
No. 77,958
(Cl. ltd-3G8)
This invention relates to a developing apparatus for use
To use this new batch of developer material containing
the blue toner, it would either be necessary to empty the
developer mixer containing the black toner from the
developer housing and replace it with this new mixture
or to deposit the new mixture in a separate developer
assembly which could be attached to the machine in
place of the original developer assembly.
It is therefore the principal object of this invention to
improve developing apparatus whereby the conveyor as
in developing electrostatic latent images.
10 sembly, toner dispenser, and their drives are formed as
More speci?cally, the invention relates to improved
an integral component readily mounted on a xerographic
automatic developing apparatus for use in an automatic
apparatus.
xerographic reproducing apparatus.
In the process of xerography, for example, as disclosed
in either Carlson Patent 2,297,691, issued October 6, 1942,
or in Carlson Patent 2,357,809, issued September 12, 1944,
a xerographic plate, comprising a layer of photo-conduc
tive insulating material on a conductive backing, is given a
uniform electric charge over its surface and is then ex
posed to the subject matter to be reproduced, usually by
conventional projection techniques. This exposure dis
Another object of the invention is to improve xero
graphic developing apparatus containing a toner dispenser
mounted ‘therein which is operated at a speed in direct
relationship to the rate of operation of the conveyor
mechanism of the developing apparatus whereby toner
is added to the developing mixture at an optimum rate
directly dependent on the speed at which the developing
material is cascaded onto a xerographic drum for de
veloping.
charged the plate areas in accordance with the radiation
intensity which reaches them and thereby creates an elec
trostatic latent image on or in the plate coating.
For a better understanding of the invention as well
as other objects and further features thereof, reference
is had to the following detailed description of the inven
Development of the image is effected with developer 25 tion to be read in connection with the accompanying
material or developers which comprise, in general, a mix
drawings, wherein:
ture of a suitable pigmented or dyed electroscopic powder,
FIG. 1 is a schematic illustration of a preferred form
hereinafter referred to as toner, and a granular carrier
of ‘an ‘automatic xerographic reproducing apparatus using
material, which latter functions to carry and to generate
a developing apparatus constructed in accordance with
triboelectric charges on the toner. More exactly, the 30 the invention;
function of the granular material is to provide the me—
FIG. 2 is a left-hand view of the xerographic reproduc
chanical control to the powder, or to carry the powder
ing apparatus of FIG. 1 illustrating the mounting position
to an image surface and, simultaneously, to provide al
of a developing apparatus constructed in accordance with
most complete homogeneity of charge polarity. In the
development of the image, the toner powder is brought
into surface contact with the coating and is held thereon
electrostatically in a pattern corresponding to the electro
static latent image. Thereafter, the developed Xerographio
image is usually transferred to a support or transfer mate
rial to which it may be ?xed by any suitable means.
Development of the electrostatic latent images in com
mercial line-copying automatic xerographic machines is
usually effected at a developing station of the machine
the invention;
PEG. 3 is ‘a perspective view ‘of the developing appa
ratus of the invention removed from the apparatus to
show details of its construction;
FIG. 4 is a sectional view of the developing apparatus
taken ‘along line 4—4- of FIG. 2;
FIG. 5 is a top view of a preferred form of toner dis
penser for use in the developing apparatus but removed
from the apparatus to show details of its construction;
PEG. 6 is an end view of the toner dispenser;
PEG. 7 is a sectional view of the toner dispenser taken
45 along
line 7—7 of FIG. 5;
wherein is located a developer housing having a lower
or sump portion for accumulating developer material.
Mounted within the developer housing is a bucket type
FIG. 8 is an enlarged sectional view showing the de
conveyor continually in motion while the machine is in
tails of the toner outlet of the dispenser only;
operation to carry the developer material from the sump
FIG. 9 is a top enlarged view of the dispenser drive
to the upper portion of the developer housing from where
mechanism;
and
the developer material is cascaded over a hopper chute 50
FIG. 10 is an enlarged sectional view taken along line
onto the drum. This type of developing mechanism is well
ltl-—1ti of FIG. 9.
suited for use in automatic machines since continuous op
General
eration of the conveyor will e?ect a continuous develop
ing process.
As
shown,
the
xerographic
apparatus comprises a xero
vIn the course of operation of the developing process, 55 graphic plate including a photoconductive layer or light
the carrier material is not depleted, but the toner is of
receiving surface on a conductive backing and formed in
course continuously attracted to the electrostatic latent
the shape of a drum, generally designated by numeral
image to effect its development and then transferred to a
20, which is journaled in a frame, including frame plates
support material. Toner thus consumed must be replen
10 and 11 suitably connected together and maintained
ished if proper development of the electrostatic images is 60 rigidly in spaced relation to each other, to rotate in the
to be maintained, as is desired in an automatic machine.
direction indicated by the arrow to cause the drum sur
As previously described, the toner may be a suitably
face sequentially to pass a plurality of xerographic proc
pigmented or dyed electroscopic powder, and although a
essing stations.
black pigmented powder is usually used to develop the
For the purpose of the present disclosure, the several
electrostatic latent images, other colored toners may be 65 xerographic
processing stations in the path of movement
used to develop the images. When it is desired to change
of the drum surface may be described functionally as
from say a black toner to a blue~tinted toner, it is ap
follows:
parent that blue toner cannot be added to the black toner
A charging station, at which a uniform electrostatic
Without affecting the resultant color of the combination
charge
is deposited on the photoconductive layer of the
of toners. Thus, if it is desired to use blue toner, for 70 xerographic drum;
example, the blue toner must be mixed with a clean supply
An exposure station, at which a light or radition pat
of granular carrier material.
tern of copy to be reproduced is projected onto the drum
3,067,720
.
r
*'
4
surface to dissipate the drum charge in the exposed areas
thereof and thereby form a latent electrostatic image of
the copy to be reproduced;
A developing station, at which a xerographic develop
portion of the developer housing from where the de
veloper material is cascaded over a hopper chute onto
the drum.
static charge opposite to that of the‘ electrostatic latent
As the developer material cascades over the drum,
toner particles of the developer material adhere electro
statically to the previously formed electrostatic latent
image are cascade over the drum surface, whereby the
image areas on the drum to form a visible xerographic
A transfer station, at which the xerographic powder
during the developing operation to form the xerographic
powder images are replenished by a toner dispenser 37,
of the type disclosed in copending application Serial No.
77,955, ?led concurrently herewith on December 23, 1960,
ing material including toner particles having an electro
powder image; the remaining developer material falling
toner particles adhere to the electrostatic latent image to
off the peripheral surface of the drum into the bottom
from a xerographic powder image in the con?guration of
‘the copy of the reproduced;
10 of the developer housing. Toner particles consumed
image is electrostatically transferred from the drum sur
face to a transfer material or support surface; and
A drum cleaning and discharge‘ station, at which the
drum surface is ?rst charged and then brushed to remove
residual toner particles remaining thereon after image
transfer, and at which the drum surface is exposed to a
relatively bright light source to effect substantially com
plete discharge of any residual electrostatic charge re
maining thereon.
in the name of Roger H. Eichorn and William G. Lewis,
mounted within the developer housing.
Positioned next adjacent to the developing station is the
image transfer station D which includes suitable sheet
feeding mechanism adapted to feed sheets of paper suc
20 cessively to the xerographic drum in coordination with
The charging station is preferably located as indicated
by reference character A in the schematic illustration of
the apparatus. In general, the charging apparatus or
the presentation of the developed image on the drum at
the transfer station. The sheet feeding mechanism in
transversely across the‘ drum surface and are energized
the top sheet of the stack of support material to a sheet
conveyor mechanism 43 having paper grippers 44 thereon
which carry the sheet support material into contact with
cludes a sheet source such as tray 41 for a plurality of
sheets of a suitable support material, that is, sheets of
corona charging device 21 includes a corona discharge
array of one or more discharge electrodes that extend 25 paper or the like, a separator roller 42 adapted to feed
from a high potential source and are substantially en
closed within a shielding member.
Next subsequent thereto in the path of motion of the
the rotating xerographic drum in coordination with the
projection system or the like designed to project a line
copy image onto the surface of the photoconductive xero
graphic drum from a suitable original.
means of a corona transfer device 45 that is located at or
xerographic drum is an exposure station E. This exposure 30 appearance of a developed image at the transfer station.
The transfer of the xerographic powder image from
station may be one of a number of types of mechanisms
the drum surface to the support material is effected by
or members such as desirably an optical scanning or
The optical scanning or projection assembly consists
of a copyboard in the shape of a drum, hereinafter re
ferred to as copy drum 22, which is adapted to support
immediately after the point of contact between the sup
port material and the rotating xerographic drum. The
corona transfer device 45 is substantially similar to the
corona discharge device that is employed at the charging
station in that it also includes an array of one or more
copy to be reproduced and arranged to rotate in light
corona discharge electrodes that are energized from a
projection relation to the moving light-receiving surface
of the xerographic plate. Uniform lighting is provided
‘across the drum surface and are substantially enclosed
by suitable lamps attached to a slotted light re?ector 23
mounted adjacent to the copy drum.
A light shield 24 adapted to protect the xerographic
plate from extraneous light is positioned adjacent to the
surface of the xerographic plate. A slot aperture 25 in
the light shield extends transversely to the path of move
ment of the light-receiving surface of the xerographic
suitable high potential source and extend transversely
with a shielding member. In operation, the electrostatic
?eld created by the corona transfer device is effective to
tack the transfer material electrostatically to the drum
surface and simultaneously with the tacking action, the
electrostatic ?eld is effective to attract the toner particles
comprising the xerographic powder image from the drum
relatively small cabinet, a folded optical system including
surface and cause them to adhere electrostatically to the
surface of the support material.
As the paper gripper mechanism continues to move for
ward in its closed circuit, it will strip the support mate
rial from the xerographic drum and carry it to a ?xing
device, such as, for example, heat fuser 46, whereat the
an object mirror 26, a lens 27, and an image mirror 23
developed and transferred xerographic powder image on
drum 2%) to permit re?ected rays from the copy drum
to be directed against a limited transverse area of the
light~receiving surface as it passes therebeneath.
To enable the optical system to be enclosed within a
is used in the preferred embodiment of the apparatus.
the support material is permanently ?xed thereto.
Copy fed through paper guides 31 to the copy drum is
After fusing, the ?nished copy is preferably discharged
removably secured thereon by a suitable gripper mecha
from the apparatus at a suitable point for collection ex
nism for movement therewith in timed relation to the
ternally of the apparatus. To accomplish this there is
movement of the xerographic drum whereby a flowing
provided a pair of delivery rolls 47 and 48 by means of
image of the copy is projected onto the xerographic drum. 66 which the copy is delivered to a copy holder after it is
The copy is held against the surface of the copy drum
released by the gripper mechanism. Suitable cam means
are provided at the receiving and delivery stations of the
by means of guides 32 and 33, the latter also preventing
the trailing edge of the copy from contacting the web
conveyor mechanism to actuate the paper gripper at these
cleaner 54. After the copy is scanned it can be released
from the copy drum to be transported out of the machine
by copy feed out roller 34 coacting with the peripheral
surface of the copy drum to forward the copy through
copy guide 30.
stations to receive or discharge a sheet of support material.
The next and ?nal station in the device is a drum clean
ing station E whereat any powder remaining on the xero
graphic drum after the transfer step is removed and‘.
whereat the xerographic drum is ?ooded with light to‘
Adjacent to the exposure station is a developing sta
cause dissipation of any residual electrical charge remain,»
tion C in which there is positioned a developer apparatus 70 ing on the xerographic drum.
35 including a developer housing having a lower or sump
To aid in the removal of any residual powder remain»
portion for accumulating developer material 36. Mounted
ing on the xerographic drum there is provided a corona
precleaning device 51 that is substantially similar to the
corona discharge device that is employed at charging
viously supplied to the developer housing to the upper 75 station A. Removal of residual powder from the Xero~.
within the developer housing is a motor driven bucket
type conveyor used to carry the developer material pre
5
graphic drum is effected by means of a web cleaner device
54 adapted to continuously feed a clean ?brous web ma
terial into wiping contact with the xerographic drum. As
shown, the web material 55 is taken from a supply roll
56 and transported around a cleaning roll 57, preferably
made of rubber, around a guide plate 58 to be wound on
housing from where it is cascaded over the xerographic
drum. In the embodiment disclosed the bucket-type con
veyor consists of a series of parallel spaced buckets 207
secured as by staples or rivets to a pair of endless conveyor
a take-up or rewind roll 61.
belts
veloper material from the reservoir portion of the de
veloper housing to the upper portion of the developer
wrapped around conveyor pulleys 211, having
Any residual electrical charge remaining on the xero
pins 21 thereon to engage the lugs of the conveyor belts,
graphic drum is dissipated by light from a ?uorescent
secured to the drive and idler shafts 213- and 214, respec
lamp 62 mounted in a suitable bracket above the xero 10 tively, to rotate therewith, the shafts being journaled in
graphic drum, a suitable starter being provided for en
hearings 215.
ergizing the ?uorescent lamp.
Each hearing is mounted in a cup-shaped bearing hous
Suitable drive means drive the xerographic drum, the
ing 216, one end of the bearing butting against a seal
copy drum, and the sheet conveyor mechanism at pre
2.17 and the other end butting against socket plate 218,
determined speeds relative to each other, and to effect
each socket plate and bearing housing assembly being
operation of the paper separator roll, and the web cleaner
secured by means of screws 219 to the side walls of the
mechanism, the latter being driven at a speed whereby
developer housing. Suitable thrust washers 221 encircle
relative movement between the Xerographic drum and
the shafts between each pulley and the bearing housing
the web material is effected.
Suitable drive means are
adjacent thereto.
also provided for effecting operation of the conveyor
mechanism and toner dispenser of the developing appara
to drive shaft 213, outboard of the developer housing,
tus assembly, as described hereinafter.
which meshes with gear 223 secured to the shaft of gear
The conveyor is actuated by means of gear 222 secured
It is believed that the foregoing description is sufficient
head motor MST-4 mounted on spacers 224 secured to
for the purposes of this application to show the general
the side walls 2&2.
operation of a xerographic reproducing apparatus. For 25 To de?ect the developing material and to spread this
further details concerning the speci?c construction of the
material across the face of the drum as the developing
Xerographic apparatus shown, reference is made to co
iaterial is emptied out of the conveyor buckets by grav
pending application, Serial No. 77,954, ?led concurrently
ity, a hopper chute 225 is secured to the side walls of the
herewith on December 23, 1960, in the name of Roger
developer housing. As the Xerographic drum rotates, de
H. Eichorn and William G. Lewis.
veloping material previously tumbled over the flanged
Development System
Referring now to the subject matter of the invention
there is shown in FIGS. 2 to 11, inclusive, a preferred
form of developing apparatus constructed in accordance
with the invention.
In order to effect development of the electrostatic latent
image on the cylindrical xerographic plate, the develop
ing system shown, includes a developer apparatus which
coacts with the cylindrical xerographic plate or drum to
form a development zone wherein the charged and ex
posed surface of the drum is developed to form a powder
image of the copy.
For this purpose a developer housing is mounted ad
'jacent to the xerographic drum to form the development
zone. Mounted within the developer housing is a driven
bucket-type conveyor used to carry the developer mate
rial previously supplied to the developer housing to the
upper portion of the developer housing from where the
hopper chute onto the drum will cascade over the drum
and eventually fall off or be thrown off to the surface
or“ the xerographic drum to fall into the reservoir portion
of the developer housing, a pick-off chute 226 being se
cured to the side walls in position to‘ overlie the bottom
of the housing whereby developer material is directed to
the reservoir portion of the developer housing.
For removably supporting the developer assembly in
operative position adjacent to the xerographic drum the
lower end extensions of the side plates are formed with
a notched portions 223 whereby the assembly is sup-ported
on rod 231 extending between plates 10 and 11 and se
cured thereto. By this arrangement the assembly can
be pivoted around rod 231 either toward the Xerographic
rum to place it in operative relation thereto, or it can
be pivoted away from the drum to permit either servic
ing of the assembly or removal of the assembly from the
machine.
To maintain the developer assembly in operative posi
developer material is cascaded over a hopper chute onto 50
tion adjacent to the xerographic drum, the side walls are
the drum. As the developer material cascades over the
provided with outwardly extending brackets 223 adapted
drum, toner particles of the developer material adhere
to receive screws 232 by means of which the assembly
electrostatically to the previously formed electrostatic
is
adjustably and removably secured to the back edges
latent image areas on the drum, the remaining developer
‘
material falling off the peripheral surface of the drum 55 of plate 10 and to bracket 233 on plate 11,
As shown, each of the upper screws 232 is threaded
into the bottom of the developer housing. Toner particles
through the brackets 229 to abut against plate 10 or
consumed during the development operation to form the
bracket 233, whereas the bottom screws 232 extend
visible powder images are replenished by a toner dis
through suitable apertures in brackets and are threaded
penser 37 mounted within the developer housing.
into plate 1% or bracket 233 to hold the assembly in
Speci?cally, the developer assembly or apparatus 35 60 position.
'
includes a box-like developer housing having side walls
As the developing mixture is cascaded over the xero
forming
291 ‘and in
2%;the
and
lower
a sheet
portion
metalthereof
outer ashell
reservoir
or cover
for de
graphic drum, toner particles are eleotrostatically pulled
veloper material 36, these elements being held together,
with ‘seals 2% interposed therebetween, by tie rods 2%
away from the carrier component of the developer ma
terial and deposited on the drum to form xerographic
' powder images, while the partially denuded carrier par’
ticles pass off the drum into the reservoir. As toner pow
der images are formed, additional toner particles must
be supplied to the developing mixture in proportion to
the amount of toner deposited on the drum. To supply
to form a unitary structure. As shown, the side walls
are formed with a concave edge portion in conformity
with the shape of a Xerographic plate to permit the de
veloper housing to ‘be positioned closely adjacent to the
xerographic drum. Seals 2% are secured, as by fasteners
2ft?’ to the concave edge portions of the side walls to
contact the outer edges of the xerographic drum to form
a powder tight seal between the developer assembly and
the xerographic drum.
A suitable bucket-type conveyor is used to convey de
additional toner particles to the developer mixture, a toner
dispenser is used to accurately meter toner to the de
veloper mixture and is mounted in the developer hous
ing through a suitable opening formed in the top, back
75 portion of the outer shell.
Although any one of a number of well known powder
or granulated material dispensers may be used, the toner
dispenser shown is of the type disclosed in the referenced
copending application, Serial No. 77,955, ?led concur
rently herewith on December '23, 1960.
Referring now in particular to the ?gures which illus
trate a preferred embodiment of the toner dispenser 37,
the toner dispenser includes a container for toner formed
as a box having a top plate 241 to which is secured as by
arm or pawl 282 having a bearing 283 mounted thereon
by means of which the actuating arm or pawl is journaled
on bushing 284 encircling stud 285 secured to the guide
lever. The actuating arm or pawl is biased into driving
engagement with the ratchet wheel by a torsion spring
286 secured at one end to the actuating arm or pawl
232 and at its other end to the guide lever 273.
To effect movement of the actuating arm or pawl
spot welding, two depending end plates 242 having a
282 to index the ratchet wheel 276, the guide lever 273
is slotted as at 237 to slidably receive drive pin 288 of
lower convex shaped portion, and cut-out portions cen
the crank arm 229 secured to gear 222 mounted on drive
shaft 213 of the developer conveyor, whereby the toner
dispenser is operated at a rate dependent on the speed
243 and an enclosure or base plate 244 formed to match
at which the developer conveyor is operated.
the contour of the end plates. The container is closed
To vary the dispensing rate of the toner dispenser,
at one end by dust cap 245 and at its other end by right 15
which is dependent on the number of revolutions of the
hand bearing plate 246 and the elements attached thereto
brush per unit of time, the number of revolutions of
as described in greater detail hereinafter.
the brush per unit of time must be varied This may be
The container is supported by means of the top plate
done by varying the speed of the developer conveyor
241 adapted to extend beyond the cut-out portion of the
outer shell to rest on the top portion of the outer shell 201 or with a ?xed rate of speed for the developer conveyor
the toner dispensing rate may be varied by varying the
of the developer housing, with a suitable gasket or seal 247
trally located therein, a depending left-hand bearing plate
sandwiched therebetween, the container being held in
position by screws 232 passing through the top plates and
threaded into the outer shell of the developer housing.
The top plate is provided with an inlet opening 243
through which toner may be deposited within the con
tainer, the inlet opening being closable by means of
cover 251 pivotally secured by hinge 252 to the plate,
the hinge being secured at one end of the cover plate
and at its other end to the top plate. A gasket 253 en
circles the outer edges of the cover in position to con
tact the top plate, so that, when the cover is closed the
gasket is pressed against the top plate by means of the
spring clips 227 pivotally secured to the outer shell of the
developer housing.
Toner placed in the container is dispensed through
apertures 254 in the lower portion of the base plate by
means of cylindrical brush 255 secured to the threaded
degrees through which the ratchet wheel is indexed by
the actuating arm or pawl. in the embodiment shown
the length of throw of the actuating arm or pawl 282
, per cycle is adjusted by means of control lever 275.
Control lever 275 is provided with a cam portion 291
which can be variably positioned to interfere with the
actuating arm or pawl to disengage it from the ratchet
wheel after a predetermined length of travel.
To secure the control lever in a predetermined posi
tion, as determined by the operator, while still permitting
the operator to move the control lever to a different
setting movement, there is provided an adjustment plate
292 with scale serrations thereon by means of which the
control lever may be indexed at a predetermined position.
To force the control lever into frictional engagement with
the adjustment plate 292 there is provided a friction
plate 2'93 secured along with the adjustment plate
to the side wall 202 of the developer housing by
portion of drive shaft 256 journaled in bearings 257
and 257A mounted in bearing housings 258 and 258A 40 means of cap screws 294 threaded into the side wall,
the friction plate being biased toward the control lever
secured to the right-hand bearing plate 246 and the left
and the adjustment plate by springs 295 encircling the
hand bearing plate 243. The brush is secured axially
against the shoulder of the drive shaft 256 by means
of retaining ring 259 positioned in a suitable groove
provided in the drive shaft.
A beater shaft 261 carrying a wire beater arm 262
secured thereto is journaled in bearings 263 and 263A
mounted in bearing housings 264 and 264A and driven
by gear 265 attached thereto which meshes with gear
266 on shaft 256. Axial alignment of the beater shaft
is maintained at one end by hearing housing cover 271
mounted on the bearing housing 264A secured to the
right-hand bearing plate, and at its other end by screw
272 threaded through dust cap 245 and secured by lock
nut 273.
The bearing housings 258, 258A, 264 and 264A in
serted through apertures formed in the bearing plates,
are secured to their respective bearing plates as by peen~
ing over the edges of the bearing housing. Dust seals
267 and 268 encircle shafts 256 and 261, respectively,
within the bearing housings to protect the bearings
cap screws between the friction plate and the washer 296
butting against the head of the cap screws.
While the invention has been described with reference
to the structures disclosed herein, it is not to be con?ned
to the speci?c details set forth, as, for example, it is
apparent that other types or forms of toner dispenser can
be substituted for the toner dispenser disclosed herein.
Other modi?cations or changes may readily become ap—
parent to those skilled in the art, and therefore this ap
plication is intended to cover such modi?cations or
changes as may come within the purposes of the im
provements or the scope of the following claims.
What is claimed is:
l. A unitary developing apparatus for use in a xero
graphic reproducing apparatus wherein a xerographic
plate in the shape of a drum is journaled for rotation in
a frame element of the apparatus, the developing ap
paratus including a casing having a lower sump portion
for accumulating developing material consisting of a
mixture of toner powder and granular carrier material,
and side walls formed with a concave edge portion in
conformity with the shape of said xerographic plate; a
bucket type conveyor mounted within said casing to carry
developing material to the upper portion of said casing
where it is cascaded onto said xerographic plate, drive
mounted therein from the toner particles.
The toner dispenser when mounted in the developer
housing is driven by an extension shaft 274 inserted
through a suitable aperture in the side wall 252 of the
developer housing to engage the threaded or right~hand
end of shaft 256, the washer seal 269 butting against
means connected to said bucket-type conveyor for
the inside surface of the side wall around the aperture
operating said bucket-type conveyor at a ?xed speed, a
therein. The extension shaft carries a control lever 2'75
rotatably mounted thereon, a ratchet wheel 276 ?xed by 70 toner dispenser mounted within said casing for depositing
a metered quantity of toner powder to said lower sump
pin 277 thereon, and one end of guide lever 278 rotatably
portion, said drive means including means connected to
mounted thereon by means of bearing bushing 279 held
said toner dispenser for operating said toner dispenser
in place by retaining ring 231 positioned in a suitable
at varying speeds directly related to the speed of opera
groove formed on the end of the extension shaft.
The ratchet wheel is moved by means of actuating 75 tion of said bucket-type conveyor, and said side walls
3,067,720
10
including means adapted to coact with said frame element
3. A developing apparatus for use in a xerographic
whereby said casing is manually movable from a ?rst
position where said casing is in an inoperative relation
to said xerographic plate to a second position where
said casing is in operative relation to said xerographic
reproducing apparatus wherein a Xerographic plate in the
shape of a drum is journaled for rotation, the developing
apparatus including a casing having a lower sump portion
for accumulating developing material consisting af a mix
plate.
ture of toner powder and carrier material, and side walls
formed with a concave edge portion in conforming with
a Xerographic plate, a bucket-type conveyor mounted
within said casing to carry said developing material to the
upper portion of said casing for cascading onto said
xerographic plate, drive means connected to said bucket
type conveyor for operating said bucket-type conveyor at
2. A developing apparatus for use in a xerographic
reproducing apparatus wherein a xerographic plate in the
shape of a drum is journaled for rotation, the develop
ing apparatus including a casing having a lower sump 10
portion for accumulating developing material consisting
of a mixture of toner powder and carrier material, and
a pre-determined speed, a toner dispenser mounted on
side walls formed with a concave edge portion in con
said casing for dispensing a quantity of toner powder into
formity with said xerographic plate; a bucket-type con
veyor mounted within said casing to carry developing ma 15 said casing, a shaft journaled in one of said side walls and
operatively connected at one end to said toner dispenser
terial to the upper portion of said casing for cascading
for actuating said toner dispenser, a rachet wheel ?xed
onto a xerographic plate, drive means connected to said
to one end of said shaft, a guide lever pivotally connected
bucket-type conveyor for operating said bucket-type con
at one end to said shaft and adapted to engage said drive
veyor at a predetermined speed, a toner dispenser mounted
within said casing for dispensing a metered quantity of 20 means whereby said guide lever is pivoted about said shaft,
a pawl pivotably connected to said guide lever, spring
toner powder to said lower sump portion, a shaft jour
means operatively connected to said pawl to normally
naled in one of said side walls and operatively connected
bias said pawl into engagement with said rachet wheel, a
to said toner dispenser for actuating said toner dispenser,
control lever pivotably connected to said shaft, said con
a rachet ?xed to one end of said shaft, a crank arm hav
ing a pin eccentrically mounted thereon and operatively 25 trol lever having a cam portion thereon adapted to said
pawl to limit the length of travel of said pawl, and means
connected to said drive means, a guide lever pivotably
operatively connected to said control lever whereby said
connected at one end to said shaft and at its other end
cam portion of said control lever is adjustably positioned
provided with a slot to receive said pin, a pawl pivotably
to vary the length of travel of said pawl.
connected to said guide lever, a spring means connected 30
at one end to said guide lever and at its opposite end to
References Cited in the ?le of this patent
said pawl to normally bias said pawl into engagement
with said rachet, and a control lever adjustably positioned
to engage and arrest the movement of said pawl whereby
the stroke of said pawl may be varied.
UNITED STATES PATENTS
2,779,306
2,965,756
Dunn _______________ __ Jan/29, 1957
Vyverberg ____________ __ Dec. 20, 1960
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