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Патент USA US3100117

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Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet l
INVENTORS.
HOWARD C. DAVIS
ROGER H.E|CHORN
FRAZER D. PUNNETT
HAROLD E.TRUMBULL
JOHN W. WAGNER
BY%WW/M
Afro/E NEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet 2
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INVENTORS.
HOWARD C. DAVIS
ROGER H. ElCHORN
FRAZER D. PUNNETT
HAROLD E.TRUMBULL
BY JOHN W. WAGNER
ATTORNEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet- 3
INVENTORS.
>
HOWARD c. oAvlé
ROGER H.EICHORN
FRAZER D. PUNNETT
HAROLD E.TRUMBULL
JOHN W. WAGNER
A TTORNEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet 4
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‘--->8 INVENTORS.
HOWARD C. DAVIS
ROGER H.E|CHORN
FRAZER D. PUNNETT
HAROLD E.TRUMBULL
JOHN W. WAGNER
ATTORNEYS
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
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ROGER' H. EIOHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
JOHN W. WAGNER
BY
ATTORNEY
Aug- 5, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet 6
INVENTORS
HOWARD G..D'AVIS
ROGER H.E|CHORN
FRAZER D.PUNNETT
HAROLD E. TRUMBULL
BY
JOHN W. WAGNER
A TTORNEY
Aug- 6, 1963
H‘. c. DAVIS ETAL
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3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
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ATTORNEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23. 1960
17 Sheets-Sheet 8
FIG.8
INVENTURS.
HOWARD C. DAVIS
ROGER H.EICHORN
BY
FRAZER DVPUNNETT
HAROLD E-.TRUMBULL
JOHN W. WAGNER
A TTORNE Y
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
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JOHN W. WAGNER
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
17 Sheets-Sheet 10
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INVENTORS.
HOWARD C.DAVIS
ROGER H.E|CHORN
FRAZER D. PUNNETT
HAROLD E.TRUMBULL
BY
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JOHN W. WAGNER
A TTORNEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 25, 1960
l7 Sheets-Sheet 11
INVENTORS.‘
=HOWARD c. DAVIS
ROGER H. EICHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
JOHN W. WAGNER
A TTORNEY
Aug. 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 25, 1960
17 Sheets-Sheet 12
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INVENTORS.
HOWARD C.DAV|S
ROGER H. EICHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
JOHN W. WAGNER
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BY
ATTORNEY
Aug- 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23. 1960
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INVENTORS.
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HOWARD C. DAVIS
ROGER H. EICHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
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A TTORNEY
Aug- 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
1'7 Sheets-Sheet 14
INVENTORS. ,
HOWARD O. DAVIS
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ROGER H. EICHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
JOHN W. WAGNER
ATTORNEY
Aug. 6, 1963
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Filed Dec. 23, 1960
3,100,112
H. c. DAVIS ETAL
DOCUMENT FEED MECHANISM
1'7 Sheets-Sheet 15
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INYEN'TORS.
HOWARD. O; DAV|S,-'~_ V
ROGER H ‘?cHoRi-lil.
FRAZER o. PUNN-ETT
HAROLD E. TRUMBU LL
JOHN W. WAGNER
Bywq/éwéu
ATTORNEY
Aug- 6, 1963
H. c. DAVIS ETAL
3,100,112
DOCUMENT FEED MECHANISM
Filed Dec. 25. 1960
1''! Sheets-Sheet l6
INVENTORS.
HOWARD CL DAVIS
ROGER H. EIGHORN
FRAZER D. PUNNETT
HAROLD E. TRUMBULL
JOHN W. WAGNER
8%WM
ATTORNEY
Aug. 6, 1963
3,100,112
H. c. DAVIS ETAL
DOCUMENT FEED MECHANISM
Filed Dec. 23, 1960
l7 Sheets-Sheet 17
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HRF O RAWGAREZOR ELDHRD /C£D.WEDwPTEAHUNRVO TUnbRNM
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BY JOHN W. WAGNER
A TTORNEY
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.
3,l0il,l l2
Patented Aug. 6, 1963
1
2
FIG. 5 is a left-hand side view of the apparatus with
3,100,112
the left-hand frame plate removed;
DOCUMENT FEED MECHANISM
Howard C. Davis, Columbus, Ohio, Roger H. Eichorn,
Webster, N.Y., Frazer D. Funnett, Worthington, and
FIG. 6 is a top view of the apparatus similar to FIG. 4,
but with the optical mechanism and the developer mecha
nism removed;
Harold E. Trumbull, Columbus, Ohio, and John W.
Wagner, Pen?eld, N.Y., assignors, by direct and mesne
assignments, to Xerox Corporation, a corporation of
FIG. 7 is a sectional view taken along lines 7-7 of
FIG. 5;
New York
FIG. 8 is a sectional view taken along lines 8-.-8 of
Filed Dec. 23, 1960, Ser. No. 77,953
8 Claims. (Cl. 271—53)
FIG. 4;
FIG. 9 is a sectional View taken along lines 9-9 of
FIG. 5;
This invention relates to a xerographic reproducing ap
paratus and, in particular, to a document feed mechanism
FIG. 10 is a sectional view taken along lines 10—10
for transporting a document or original to be reproduced.
of FIG. 4;
Speci?cally, the invention relates to an improved docu
FIG. 11 is a perspective view of the paper feed mecha
ment feed mechanism including a copy drum having 15 nism of the apparatus;
clamping means or grippers by which a document may be
FIG. 12 is a sectional enlarged view of the paper sepa
releasably secured on the copy drum so as to be carried
around thereby and so as to be released from the copy
rato-r mechanism;
FIG. 13 is an enlarged left-hand view of the paper tray
assembly;
drum when desired, and a document registration and hold
ing device adapted to facilitate the registration and loading 20
FIG. 14 is a sectional view of the paper guide mecha
of documents onto the copy drum.
nism and elements cooperating therewith;
Both in the printing art and in the document reproduc
FIG. 15 is a perspective view of the paper guide
ing art, various devices have been designed and con
mechanism;
structed by means of which thin ?exible sheets, such as
FIG. 16 is an exploded perspective view of the paper
documents or sheets of paper, are carried in a circular path 25 separator mechanism;
by means of a blanket cylinder, or copy drum. Also in
FIG. 17 is an exploded perspective view of the me
these machines, various devices have been used to permit
the releasable securing of a ?exible sheet onto the drum
or cylinder and to permit the release of these sheets from
the drum or cylinder when desired.
In these prior art devices, wherein a document or other
sheet material is carried by ‘a copy drum or cylinder, the
chanical control mechanism of the apparatus;
FIGS. 18, 19, 20 and 21 are schematic illustrations of
the control mechanism of the apparatus showing the
sequence of operation of these elements; and,
FIG. 22 is a schematic electrical circuit wiring diagram
of the apparatus.
Referring now to the drawings, there is shown in FIG. 1
document, which is usually presented manually to the
machine had to be held in a loading position until the very
instant that it is picked up by the grippers on the copy
a xerographic reproducing apparatus used for producing
xerographic reproductions from a moving original.
The xerographic reproducing apparatus is adapted for
drum. However, since the copy drum is usually posi~
tioned within the machine, out of sight of the operator,
it is di?icult for the operator to judge when to release the
document to the copy drum. If the operator releases the
document too soon it may not be gripped in proper regis
tration on the copy drum, whereas if the operator holds
onto the document too long, the document may be pulled
installation within ‘a suitable light-tight housing or cabinet
of :a sizeso that the entire unit may be mounted on an
office desk or table.
40
General
As shown, the xerographic apparatus comprises a XGTOF
graphic plate including a photoconductive layer or light
receiving surface on a conductive backing and formed in
It is, therefore, the principal object of this invention to
improve document feed mechanism whereby a document 45 the shape of a drum, generally designated by numeral 20:,
from the copy drum and torn in the process. '
may be releasably secured in position on a rotating copy
drum so as to be carried around thereby and so as to be
which is journaled in a frame to rotate in the direction
indicated by the arrow to cause the drum surface sequen
tially to pass a plurality of xerographic processing stations.
readily releasable from the drum when desired without the
For the purpose of the present disclosure, the several
necessity of stopping the copy drum.
Another object of this invention is to improve registra~ 50 Xerographic processing stations in the path of move~
ment of the drum surface may be described functionally
tion and holding devices to provide accurate and safe feed,
ing of documents or other sheet material to a copy drum
or cylinder conveyor.
as follows:
A charging station, at which a uniform electrostatic
charge is deposited on the photoconductive layer of the
A still further object of the invention is to provide for
the locating and holding of a document in a loading posi 55 xerographic drum;
An exposure station, at which a light or radiation pat
tion for attachment to a copy drum or other cylindrical
tern of copy to be reproduced is projected onto the drum
conveyor and wherein the document is released to the
surface to dissipate the drum charge in the exposed areas
copy drum or cylindrical conveyor by action of the copy
thereof and thereby form a latent electrostatic image of
drum or the cylindrical conveyor.
the copy to be reproduced;
For ‘a better understanding of the invention as well as
A developing station, at which a xerographic develop
other objects and further features thereof, reference is had
ing material including toner particles having an elec
to the following detailed description of the invention to be
trostatic charge opposite to that of the electrostatic latent
read in connection with the accompanying drawings,
image are cascaded over the drum surface, whereby the
wherein:
FIG. 1 is a left-‘hand perspective view of the apparatus 65 toner particles adhere to the electrostatic latent image to
of the invention;
FIG. 2 is a schematic illustration of the apparatus of
the invention;
FIG. 3 is a left-hand View of the apparatus of the in
form a xerographic powder image in the con?guration
of the copy to be reproduced;
A transfer station, at which the xerographic powder
image is electrostatically transferred from the drum sur
70 face to a transfer material or support sur?ace; and
vention, with the cabinet covers removed;
A drum cleaning and discharge station, at which the
FIG. 4 is atop view of the apparatus of the invention;
drum surface is ?rst charged and then brushed to remove
3,100,112
.
4
3
residual toner particles remaining thereon after image
the name of Roger H. Eichorn and William G. Lewis,
transfer, and at which the drum surface is exposed to a
mounted Within the developer housing.
Positioned next adjacent to the developing station is
the image transfer station D which includes suitable sheet
relatively bright light source to effect substantially com
' plete discharge of any residual electrostatic charge re
maining thereont
-'Ihe charging station is prefrably located as indicated
by reference character A in the schematic illustration ofv
the apparatus. In general, the charging apparatus or
feeding mechanism adapted to feed sheets of paper suc
cessively to the xerographic drum in coordination with
the presentation of the developed image on the drum at
the transfer station. The sheet feeding mechanism in
cludes a sheet source such as tray 41 for a plurality of
array of one or more discharge electrodes that extend 10 sheets of a suitable support material, that is, sheets of
corona charging device 21 includes a corona discharge
transversely across the drum surface and are energized
from a high potential source and are substantially en
closed within a shielding member.
"
paper or the like, a separator roller 42 adapted to feed
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
This ex 15 they rotating xerographic drum in coordination with the
Next subsequent thereto in the path of motion of the
xerographic drum is an exposure station B.
posure station may be one of a number of types of
mechanisms or members such’ as desirably an optical
scanning or projection system or the like designed to pro
appearance of a developed image at the transfer sta
tion.
The transfer of the xerographic powder image from the
drum surface to the support material is effected by means
ject a line copy image onto the surface of the photocon
20 of a corona transfer device 45 that is located at or imme
ductive xerographic drum from a suitable original.
diately after the point of contact between the support
.The optical'scanning or projection. assembly consists
material and the rotating xerographic drum. The corona
of a copyboard in the shape of a drum, hereinafter
transfer device 45 is substantially similar to the corona
referred to as copy drum 22, which is adapted to support
discharge device that is employed at the charging station
copy to be reproduced and arranged to rotate in light-pro
jection relation to the moving light-receiving surface of 25 in that it also includes an array of one or more corona
the xerographic plate. Uniform lighting is provided by
suitable'lamps attached to'a slotted light re?ector 23
discharge electrodes that are energized from a suitable
high potential source and extend transversely across the
mounted adjacent to the copy drum. ‘
drum surface and are substantially enclosed with a shield
A light shield 24 adapted to protect the xerographic
ing member. In operation, the electrostatic ?eld created
plate from extraneous light is positioned adjacent to the 30 by the corona transfer device is effective to tack the trans
surface of the xerographic plate. A slot aperture 25 in
fer material electrostatically to the drum surface and
the light shield extends transversely to the path of move
simultaneously with the tacking action, the electrostatic
ment of the light-receiving surface of the xerographic
?eld is effective to attract the toner particles comprising
drum 20 to permit re?ected rays from the copy drum
the xerographic powder image from the drum surface and
to be directed against a limited transverse area of the 35 cause them Ito adhere electrostatically to the surface of
light-receiving surface as it passes therebeneath.
To enable the optical system to be enclosed within
‘a relatively small cabinet, a folded optical system includ
ing an object mirror 26, a lens 27,‘ and an image mirror
28 is used in the preferred embodiment of the apparatus.
7 Copy fed through paper guides 31-to the copy drum
is removably secured thereon by a suitable gripper mecha
nism for movement therewith in timed relation to the
movement of the xerographic drum whereby a flowing
imageof the copy is projected onto the xerographic drum.
The copy is held against the surface of the copy drum by
means of guides 32 and 33, the latter also preventing the
trailing edge of the copy from contacting the Web cleaner
the support material.
As the paper gripper mechanism continues to move for
ward in its closed circuit, it will strip the support material
from the Xerographic drum and carry it to a ?xing device,
such as, for example, heat fuser 46, whereat the developed
and ‘transferred xerographic powder image on the support
material is permanently ?xed thereto.
After fusing, the ?nished copy is preferably discharged
from the apparatus at a suitable point for collection ex
ternally of the apparatus. To accomplish this there is
provided a pair of delivery rolls '47 and 48 by means of
which the copy is delivered to a copy holder after it is
released by the gripper mechanism. Suitable cam means
54. After the copy is scanned it can be released from
are provided at the receiving and delivery stations of the
the‘ copy drum to be transported out of the machine by 50 conveyor mechanism to actuate the paper gripper at these
copy feed out roller 34 coacting with the peripheral sur
stations to receive or discharge a sheet of support mate
face of the copy drum to forward the copy through copy
rial.
guide 30.
'
,
Adjacent to the exposure station is a developing sta
‘
'
V 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
35 including a developer housing having a lower or sump
whereat the xerographic drum is flooded with light to
portion for accumulating developer material 36. Mount
cause dissipation of any residual electrical charge remain
ed ‘within the developer housing is a motor driven bucket~
ing on the xerographic drum.
type conveyor used to carry the developer material previ
To aid in the removal of any residual powder remain
ously supplied to the developer housing to the upper por 60
ing on the xerographic drum there is provided a corona
tion of the developer housing from where the developer
material is cascaded over a hopper chute onto the drum.
precleaning device 51 that is substantially similar to the
As the developer material cascades over the drum,
corona discharge device that is employed at charging sta
toner particles of the developer material adhere elec
tion
A. Removal of residual powder from the xero
trostatically to the previously formed electrostatic latent 65 graphic drum is effected by means ‘of a web cleaner
vimage areas on the drum to form a visible xerographic
device 54 adapted to continuously feed a clean ?brous
powder image; the remaining developer material falling
web material into wiping contact with the xerographic
off the peripheral surface of the drum into the bottom of
drum. As shown, the web material 55 is taken from a
the deveolper housing. Toner particles consumeddur
vsupply
roll 56 and ‘transported‘around a cleaning roll 57,
70
ing the developing operation to, form the xerographic
preferably made of rubber, around a guide plate 58 to be
powder images, are replenished by a toner dispenser 37-, '
tion C in which there is positioned a developer apparatus
of the type disclosed in copending applications, Serial
wound on a take-up or rewind roll 61.
No. 77,955, ?led concurrently herewith on December 23,
1960, in the name of Roger 1H. Eichorn and William G.
graphic drum is dissipated by light from a ?uorescent
Any residual electrical chargeremaining on the xero
Lewis, and Serial No. 77,954, ?led December 23, 1960, in 75 lamp 62 mounted in a suitable bracket above the xero~
5
3,100,112
graphic drum, a suitable starter being provided for ener
gizing the ?uorescent lamp.
Suitable drive means drive the xerographic drum, the
copy drum, the sheet conveyor mechanism at predeter
mined speeds relative to each other, and to effect opera
tion of the paper separator roll, and the web cleaner
mechanism, the latter being driven at a speed whereby
relative movement between the xerograp-hic drum and the
or retaining clips 109 and its forward progress is arrested
by document stops 101 which also serve to align the
leading edge of the document in parallel relationship to
the axis of the copy drum.
In the embodiment shown two document stops are
used, each of which is secured to a hub block 108, with
a guide 103 superimposed thereover, by means of a
screw 107. Each hub block 108 is loosely journaled on
web material is effected. Suitable drive means are also
the rod and positioned axially thereon by means of re
provided for effecting operation of the conveyor mecha 10 taining rings 106 retained in suitable grooves formed in
nism and toner dispenser of the developing apparatus
the rod. The hub blocks 108 carrying the document
assembly.
stops 101 and guides 103 are each normally biased in a
Referring now to the ?gures, there is provided a frame
counter-clockwise direction, as seen in FIG. 5, around
for supporting the components of the apparatus formed
the rod by torsion springs 112, each spring being con
by left-hand plate 10, intermediate plate 11 and right 15 nected at one end to a pin 111 extending from a hub
hand plate 12 connected together and maintained rigidly
block 108 and at its other end to a pin 111 extending
in spaced relation to each other by suitable tie rods 13
radially from the rod. The pins 111 are positioned in
and :14.
interfering relationship with each other to limit the arc
The xerographic drum 20, which includes a cylinder
of travel of the hub blocks around the rod.
71, having a layer of photoconductive insulating mate 20
rial on a conductive back, supported by drum hubs 72
and 73 biased toward each other by springs 74, is
The document stops 101 normally biased, as previ
ously described, into contact with the copy drum to retain
and align each document prior to engagement by the
mounted on horizontal driven shaft SI-I-l that rotates in
copy drum are disengaged by means of the actuator 102
secured to the rod in a manner described hereinafter,
or right-hand end of shaft SH-l, as seen in FIG. 7, is 25 to release the documents to the copy drum.
The retaining clips 109 are also mounted on hub blocks
threaded to receive thumb nut 76 by means of which the
bearings 75 mounted in plates 11 and 12. The free end
108a loosely journaled on the rod in an off-center posi
tion so that the blocks will rotate by their own weight
to force the clips into contact with the copy drum or on
provided with an apenture 79 to receive the pin.
30 a document sandwiched therebetween with suf?cient force
Exposure Mechanism
to hold a document against the copy drum while still
permitting a document to be inserted between the copy
Referring now to the subject matter of the invention
drum and the retaining clips as a copy is forwarded
the expo-sure mechanism of the xerographic reproducing
pin 77 on hub 73 is held in driving engagement with the
hub portion of the sprocket 78', the hub portion being
apparatus is designed to use an optical projection or scan
ning mechanism adapted to scan a copy or ‘document 35
wrapped around a rotating copy drum and to project a
?owing image of the copy or document onto the photo
conductive surface of the rotating drum.
In the exposure mechanism shown, the scanning of the
therebetween.
The copy drum 22 includes a cylindrical wall portion
115‘ secured as by welding to end plates 116 and 116a,
the latter carrying a hub 117 by means of which the
drum is secured to shaft SH—-2. Shaft SH~2 is supported
by ?anged bearings 1-18 positioned in plates 10 and 11,
document or original is accomplished by means of a 40 and held in axial alignment by means of retaining rings
121 positioned in suitable grooves provided in the shaft,
document feed mechanism constructed in accordance
with the invention. The document feed mechanism in
thrust bearings 122 and 123 being provided between the
?anged bearings and the retaining rings.
cludes a cylinder or copy drum to support the document
or original to be reproduced in wrap-around relation on
the cylinder or copy drum which is rotated relative to
‘The copy drum is driven in timed relation with the
xerographic drum by means of chain 124 which runs on
an optical system in synchronization with the rotation of
the xerographic drum. Positioned adjacent to the cylin
der or copy drum is a feeding station, sometimes referred
sion on chain 124.
to as a loading station, at which documents are fed, usu
ally manually, to the copy drum. In the feeding station,
a document is fed to the copy drum so that the leading
edge of the document is parallel to the axis of the copy
sprockets 125 and 126, ?xedly mounted on shafts SH-l
and SH—2, respectively, an idler sprocket 127 being
movably secured to plate 12 to permit adjusting the ten
'
The peripheral surface of the copy drum is provided
with slots 131 parallel and in line with each other
through which gripper ?ngers 132 extend to grip the lead
mg edge of a document against the peripheral surface
drum. The document is maintained in this position until
the leading edge of the document is secured to the copy 55 of the copy drum. The gripper ?ngers are secured by
screws 107 on rock shaft 133 which is rotatively mounted
drum by means described in detail hereinafter.
in the end plates of the copy drum in such a manner
The feeding station includes a guide 311, which is
that
upon rotation of the rock shaft the gripper ?ngers
mounted between plates 10 and 11, through which a doc
are moved in unison into and out of operative pressure
ument or copy is moved forward into engagement with
relationship with the peripheral surface of the copy drum.
copy drum 22 and the document stops 101 ‘of copy guide 60 The gripper ?ngers are normally biased into operative
32, the latter orientating and holding the copy in position
pressure relationship against the peripheral surface of
to be gripped by the gripper ?ngers of the copy drum.
the copy drum by means of a spring 134 secured at one
Copy guide 32 includes document stops 101, actuator
end to a stud 135 extending from end plate 116 and
102, retaining clips 109, and guides ‘103 carried by rod
connected at its other end to pin 136 extending from
104 journaled in bearings 10'5 positioned in plates 10 and 65 lever 137 secured to the left-hand end of the rock shaft
11, is held axially in alignment by means of retaining
as seen in FIG. 6. A second lever 137 is secured to the
rings 106 positioned in suitable grooves formed in the rod
right-hand end of the rock shaft as seen in FIG. 9 in
adjacent the bearings. The rod is normally biased in a
position to be engaged by interposer shaft 138 for open
counter-clockwise direction, as seen in FIG. 5 for reasons
mg the gripper mechanism to receive a document or to
described in detail hereinafter, by a spring 1113 connected 70
release a document. The interposer shaft 138 for open
at one end to pin 111 extending radially from the rod and
mg the gripper mechanism is adapted to be moved
at its other end to a second pin ‘111 extending from plate
manually either into position for operative engagement
10.
Copy inserted through guide 311 by an operator is
with the lever 137a on the rock shaft as the drum ro
forced into contact with the copy drum 22 by the guides 75 tates, or alternatively into position so as to clear the
lever for the purpose described in greater detail herein
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