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Патент USA US2412317

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Dec. 10, 1946. .
J. T. CAMPBELL
2,412,31 7
LI'IfHOGRAPHIC PLATEMAKING APPARATUS
Original Filed Dec. 31,'1942
I5 Sheets-Sheet l I
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INVENTOR.
JA M517 7? C'AN'BGAZL
BY
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Dec. 10, 1946.
J, T', CAMPBELL
2,412,317
LITHOGRAPHIC PLATEMAKING APPARATUS
Original Filed Dec. 51, 1942
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INVENTOR.
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Dec. 10,1946.
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2,412,317
LITHOGRAPHIC PLATEMAKING APPARATUS
Original Filed Dec. 31, 1942
BY
3 Sheets-Sheet 3
2,412,317
Patented Dec. 10, 1946
UNITED STATES PATENT OFFICE
2,412,317
LITHOGRAPHIC PLATEMAKIN G APPARATUS
James T. Campbell, Detroit, Mich.
()riginal application December 31, 1942, Serial No.
470,871, now Patent No. 2,390,497, dated Decem
ber 11, 1945. Divided and this application
March 22, 1944, Serial No. 527,594
4 Claims.
(CI. 95-89)
1
2
This invention relates to apparatus for making
lithographic plates and more particularly to ape
which is disposed within the top of the cabinet
ll, being divided into a developing bath section
paratus for processing lithographic plates from
£5, a central wash section it, and a section I‘!
for containing a ?xing solution.
Suitable means are employed for controlling
developed ?lm suitable for lithography and mul
tilith presses and is a divisional application of
my pending application entitled Lithographic
plate making apparatus, ?led December 31, 1942,
Serial No. 470,871, now U. S. Patent 2,390,497.
Heretofore various apparatus has been em~
the temperature of the sink by heating or cooling
whereby a uniform quality of work can be ob
tained in the processing of exposed ?lm.
A safety lamp is is indicated above the sink
ployed for accomplishing this process, entailing 10 within the dark room i3 having two separately
illuminated compartments covered with ruby and
extensive floor space and numerous unnecessary
?ashed opal glass. A ruby glass is used for il
operations, both of which the present invention
lumination during developing of the exposed ?lm,
has sought to eliminate.
while the clear glass illumination is used for in
It is the object herein to provide means for
specting the ?nished negative after its develop
printing a developed ?lm on a sensitized metal
ment.
plate and for fully processing the same for use
in a printing press.
'
It is the object herein to provide in combina~
ticn suitable ?lm developing apparatus disposed
within a dark room, and metal plate processing
means forming a part thereof but preferably dis
posed outside the dark room.
It is the further object herein to provide said
apparatus within a suitable housing disposed
An opening It is disposed below the safety light
It and through the partition wall i2, whereby the
developed ?lm may be transferred from the dark
room to the exterior room 14 for further process
ing and printing upon a metal plate, suitable
closure means being employed for said opening.
The developed negative is then examined and
if opaquing is necessary a suitable translucent
through and within a dark room wall, together 25 opaquing table is employed so that the negative
may be touched up where desired.
with communicating means between the dark
room and the exterior whereby the developed ?lm
may be transferred for further processing outside
of the dark room.
A blanket plate printing frame 20, later de
scribed in detail and operation, hingedly mounted
in cabinet H at points 2| is adapted to be nor
Other objects will be seen in the following 30 mally positioned vertically within the cabinet,
but also adapted to be pivoted outwardly to the
speci?cation and claims describing the various
dotted line position indicated at 20’ and 20".
elements and their combinations as illustrated
Frame 20 consists of a seamless square tubing
in the accompanying drawings of which
Fig. 1 is a front elevational view of the entire
to provide a rectangular frame, with a resilient
blanket having a heading 23 forming a part
CO Cl
thereof which extends around and adjacent the
Fig. 2 is a right end elevational view of the
outside edge of the blanket for air sealing en
same.
gagement with the glass frame 24.
Fig. 3 is a fragmentary elevational section of
An intermediate plywood or other supporting
the temperature controlled sink; and
Fig. ‘l is a plan view thereof on line 4—4 of 40 base 25 is provisioned within the blanket frame
20 providing a yielding support for the blanket
Fig. 3.
member 22 and also limiting inward movement
It will be understood that said drawings illus~
thereof. Said glass frame 24 also constructed
trate merely a preferable embodiment of the in
of seamless square steel tubing, preferably, with
vention and that it is contemplated that other
embodiments are possible within the scope of the 45 a glass plate secured therein, is suitably hinged
at 26 to the blanket frame 2E‘! whereby while said
claims hereafter set out.
glass frame may move outwardly with its sup
In the drawings Fig. 1 shows the plate making
porting blanket frame, it may also be tilted up~
cabinet I I which may be provisioned with hinged
wardly with respect thereto.
doors if desired, though not shown, which is dis
Being so hinged the glass frame may remain
posed with its front surface ?ush with the par
in vertical position, and at the same time out
tition l2 separating the camera dark room I3
printing and developing apparatus.
from the exterior room M for access to said
cabinet.
ward movement of the blanket frame 20 is per
mitted to the position indicated at 20’ with a
suitable slide bracket 21 limiting the relative
Said dark room normally contains the camera,
and has access to the temperature controlled sink 55 movement.
2,412,317
3
On the other hand both frames as and 251 may
be swung outwardly to horizontal positions on
A vacuum producing source generally indicat
ed at 35 is provided within the cabinet with a
suitable conduit 36 connected thereto and com
municating with the inner surface of the blanket
frame 2% whereby air between the two frames
may be withdrawn causing the blanket member
22 within the blanket frame Zr’l to tightly engage
hinges 2i, and further glass frame 25; may be
angularly elevated around its hinged connection
26 to permit access to the blanket frame for
printing of the sensitized metal plate in the
manner hereafter described.
After examination of the developed negative.
if opaquing is desired, the blanket frame is moved
outwardly to the position shown at as’, and the
sliding opaquing table 2-3 normally disposed in
horizontal position within opening 3! in cabinet
the glass frame and to also'bring the metal plate
into contact throughout with the surface of the
'1 negative therein.
After the vacuum is applied between the two
frames, both are raised to a vertical position
II, is slid outwardly on suitable runners and
with the glass frame being disposed directly in
tilted downwardly to the position shown at 253'.
front of the lamps 32.
with its outer end resting upon the upper end of
the outwardly tilted blanket frame as shown at
20’.
The opaquing table consists of a steel or wood
en frame of the size required with one piece of
?ashed opal and one piece of blue plate glass in
serted into the frame. The inner end of the
frame has provisioned thereon clasps 29 adapted
for engagement with the pins 3@ at the outer
edge of the opening 3i to thereby prevent the
opaquing table 25 from being pulled out com
pletely from the cabinet; and further to allow the
table to be lowered to rest upon the upper edge
of the blanket frame indicated at 23’.
Frames 2% and 2d form together a vacuum con
tact printing unit between which the sensitized ‘7
plate and the negative are interposed, both
frames being ?rst pivoted to vertical position be
fore printing,
The source of illumination therefor consists of
a plurality of rows of horizontally arranged
lamps 32 which may be turned on by a suitable
- turned on
Said lamps are then
a suitable switch for a sufficient
time to obtain a print from the negative upon the
metal plate. Thereafter both frames are low
_
ered to horizontal positions, the glass frame
opened and the plate removed. Both frames Zll
and 24 may then be again moved back to vertical
position to be disposed out of the way and entire
ly within cabinet H.
The metal plate is then placed upon the ink~up
table 3? and developing ink applied thereto. The
top of the ink-up table is made of Vitro-lite. mar
ble, non-rust metal, or other similar material.
Referring to Fig. l a suitable working space A
is provided intermediate the ink-up table and
portion 13 of the cabinet H upon which the de
veloping containers l5, l6 and ii rest. Illumina
tion of this space is provided by the lamp 38 de
pending downwardly from the portion 13 of the
cabinet ii. Developing and ?xing trays i5 and
as illustrated in Figures 1 and 2 are positioned
within sink B with their bottom portions rest
ing upon the bottom of said sink. On the other
timing switch hereafter described.
hand, central wash tray [5 is positioned with its
However for opaquing work the source of light
bottom surface above the level of the ?uid in
is the same i. e. the lamps 32, whereby illumina
sink B as illustrated in Figure l, and is main
tion passing through the glass frame 263 is sup 40 tained in said position by its front and rear lip
plied to the surface of the opaquing table shown
portions which rest upon sink B in the manner
in the position 28', whereby the negative thereon
may be suitably opaqued or touched up where re
quired.
After opaquing the negative the opaquing ta
ble 28 is then slid back into horizontal position
Within opening 3! in cabinet H, and also the
blanket frame ‘id is tilted back into vertical po
sition.
A plate whirler 53 is encased in the drawer 34
within cabinet I I, or may be installed on a swivel
table; but in any event is adapted to be slid or
swiveled forward outside of the cabinet for re
ceiving the metal plate.
Said metal plate is ?owed or covered with a
illustrated in FiguregZ.)
Space A within cabinet H also provides access
to the plate developing sink 39 within which the
printed plate after inking-up is placed for water
flushing thereon until fully developed. After de
velopment the plate is dried, processed and then
it is ready to be used in a printing press for lith
ographic printing.
The plate making sink is made of selected wood
or non-rust metal, and has provisioned adjacent
its rear upper edge a suitable ?ushing pipe at,
perforated throughout its length as indicated at
£5 to provide a continuous water supply cascad
ing dovm over the printed metal plate lying upon
the inclined water rack (“32 within the developing
suitable sensitizer and then returned to its ini
tial position within the cabinet, where it is prop
sink 3%. Water is supplied through the pipe 63
erly whirled to evenly spread the sensitizer and
from a suitable exterior source for fluid commu
to thoroughly dry the same upon the plate.
nication with ?ushing pipe 533, there being a suit
Thereafter the whirler is brought forward to re 60 able manually operable quick acting gate Valve
move the plate, and immediately returned to its
interposed at M,
'
initial position out of the way within the cabinet.
An instrument panel board £55, shown in Fig. 1
Also attached to plate whirler 83 is a rheostat
on the front of cabinet H between the printing
for variable speed and an electric heating ele
frame 2i! and plate whirler 33, is exterior to the
ment to dry the solution.
_
dark room 13 with an electric interval timer 135
The blanket frames 2d and 2d are lowered to
for the vacuum printer. It is understood that
horizontal position by means of hinges 2i and the
for printing from the negative upon a sensitized
glass section Ell is separately raised on its hinges
plate within the printing frames, that the lights
26 and held in position by the slide bracket 27.
32 are on only for a short predetermined interval.
The metal plate is then placed on the blanket 22
Timer it provides manual means for regulating
and the negative properly positioned upon the
this interval of exposure.
now sensitized surface of said plate. The glass
A three-way manual valve it? is shown for en
frame 25 is again lowered until its glass portion
gaging and releasing the vacuum from they vac
contacts the rectangular beading 23 thereby pro
uum source 35 to the blanket frame 20 through
viding an air tight seal between the twov frames.
conduit 36. It will be understood that vacuum
2,412,317
5
is required only after the blanket frame 20 and
glass frame 24 are brought together with the sen
sitized plate and negative disposed therebetween.
if the temperature of the fluid sink B rises to, for
example 67 degrees F.
Valve 41 also permits a quick release of the vac
On the other hand in a cool or cold climate
thermostat switch 65 may be set also for main
uum after the printing operation by allowing air
taining the water in sink B at approximately 65
to rush in between the blanket frame and the
degrees F., being set to operate when the temper
ature drops to approximately 63 degrees F.
printing frame, whereby said printing frames
may be quickly opened, saving considerable time
heretofore lost.
It will be noted that both thermostats are so
coupled together that by a suitable shaft or lever
A manual switch d8 is shown on the panel board 10 a temperature adjustment of one automatically
for operating vacuum pump 35 as and when de
adjusts the other for the same temperature.
sired. Likewise a manual switch 49 is shown for
This guarantees that only one unit, refrigerating
turning on and oif printing lamps 32 within the
or heating, will be operative at one time. Fur
cabinet H which are disposed in parallel rela
ther such a coupling between the two thermo
tion directly behind the glass printing frame 24. 15 stats eliminates the trouble and di?iculty of sep
The vacuum gauge 5%] is indicated for visual
arately adjusting both. So arranged, an ad
measurement of the amount of vacuum desired
justment of one, causes an automatic tempera
for the printing operation, and for determining
ture setting of the other.
The cabinet housing ii therefore provides a
said operation.
20 compact lithograph ?lm developing and plate
The ?lm developing sink B with trays I5, Iii
making unit, and is intended essentially for con
and I‘! has been previously referred to as tem
serving ?ocr space, time, and numerous steps.
perature regulated by refrigerator as well as
Heretofore any one of the units above de
heating means. The refrigerator unit is gen
scribed, as for instance the negative developing
erally indicated diagrammatically at El within
sink, or the plate developing sink, or the print
the storage compartment 52 in the bottom of
ing mechanism occupied the space now occupied
cabinet I I, and is suitably connected by conduits
by the entire cabinet, effecting a space saving of
53 to the flat refrigerator coils 5A which are sol
approximately 89 percent. This feature is im
dered or otherwise secured to the under surface
portant particularly when the unit is employed
whether said vacuum is maintained throughout
of sink 13, providing an intimate heat conducting -~
contact therewith whereby a temperature regu
lated fluid may be circulated to maintain a pre
determined temperature of the water within sink
13 within which the developing and ?xing trays
are partially immersed.
A separate electrical heating cable 55, prefer
ably a lead covered wire, is also provisioned in
coils against the bottom surface of sink B be
tween and co-extensive with the refrigerator coils
54, where by thermostatic control, the tem
perature of the water within sink B can be accu
rately maintained.
Insulating material 56 preferably cork and rock
wool is then provisioned entirely around sink B,
lge'ing disposed within the compartment member
The central wash tray I6 is supplied continu
ously, when in use, with a fresh water source 58,
on ships or upon or adjacent the battle ?eld.
A storage compartment 66 is shown in Fig, 1
whichmay be accessible from both sides of the
cabinet. An additional ?lm storage compart
ment 6? is shown within the lower portion of the
cabinet l I accessible from the dark room.
It will be noted that the dark room partition or
wall I2 is built snugly around the sink so that
while the ?lm developing sink B is entirely with
in the dark room, the plate making units above
described are accessible from the room exterior
thereto.
For one man operation all apparatus could be
installed within housing cabinet ii to open out
wardly below the front section of said sink but en
, tirely within the dark room whereby all process
ing could be accomplished therein conveniently. '
It will be seen from the drawings that all appa
ratus above described is enclosed within the cabi
there being an overflow stand pipe 59 within said
tray I6 for maintaining the level of water there
in. Said stand pipe is threaded into the exten
sion pipe 60 which downwardly depends below
tray It to be removably inserted within the sink
stand pipe 6|.
net ?ush with either the front or rear thereof so
Stand pipe 59 is removable permitting flushing
and cleaning of tray it. Its extension 60 is
should now be had to the claims which follow for
determining the scope thereof.
I claim:
adapted to provide a ?uid drain connection with
the sink stand pipe so as not to disturb the cooled
water in sink B. It will be noted also that stand
that when not in use, suitable doors, not shown
in the drawings, may be closed to keep all appa
ratus clean, and further to present a neat appear
ing cabinet occupying a very minimum of space.
Having described my invention, reference
1. Apparatus for processing exposed film for
the making of lithographic plates comprising a
pipe BI is removable permitting ?ushing out of
60 cabinet housing with one edge built within and
sink B when desired.
forming a part of a dark room wall, an insulated
A drain connecting pipe 63 is adapted for
threaded connection with the sink drain pipe 62,
pipe 62 extending through the insulating com
partment 56 for communication with a suitable
sewer drain 63.
Thermostatic controls 64 and 65 are shown in
support on said cabinet within said dark room, a
temperature controlled sink nested within said
insulated support, developing and ?xing bath
trays supported upon and partially immersed
within said sink within a fluid therein, a cooling
coil secured to the bottom of said sink, a heat
instrument panel 45 for operating and regulating
ing coil also on the bottom of said sink adjacent
the refrigerator and heating units respectively
said cooling coil, a washing tray supported upon
whereby the developing sink B may be constantly 70 and disposed within said sink with its under sur
maintained at any desired predetermined tem
face above the level of ?uid therein, a fluid
perature. For instance in a warm climate ther
source to said washing tray, a water level main
taining stand pipe in said wash tray, a water level
mostat control E54 may be set to warm the water
stand pipe in said sink, axially aligned and inter
within sink B to approximately 65 degrees F., and
so adjusted as to actuate the refrigerator unit 5| 75 connected with said wash tray stand pipe, and a
2,412,317
8
drain pipe joined to said sink stand pipe and dis
posed through said insulated support for con
ducting ?uid from said wash tray independent
or" the ?uid within said sink.
2. Apparatus for processing exposed ?lm for
the making of lithographic plates comprising a
cabinet housing with one edge built within and
therein, a cooling coil secured to the bottom of
said sink, a heating coil also on the bottom of said
sink adjacent said cooling coil, a washing tray
supported upon and disposed within said sink
above the level of ?uid therein, a fluid source to
said Washing tray, a removable stand pipe in said
wash tray, a drain pipe extending below the bot
forming a part of a dark room wall, an insulated
tom thereof, a stand pipe in said sink, into which
support on said cabinet Within said dark room,
said wash tray drain may be removably inserted
a temperature controlled sink nested Within said 10 in axial alignment, and a second drain pipe joined
insulated support, developing and ?xing bath
trays supported upon and partially immersed
within said sink within a ?uid therein, a cooling
coil secured to the bottom of said sink, a heating
to said sink stand pipe and disposed through said
sink and said insulated support for conducting
?uid from said wash tray independent of the ?uid
within said sink.
coil also on the bottom of said sink adjacent said 15
4. Apparatus for processing exposed ?lm for
coolingr coil’, a washing tray supported upon and
the making of lithographic plates comprising an
disposed within said sink with its under surface
insulated support, a temperature controlled sink
above the level of fluid therein, a ?uid source to
nested within said insulated support, developing
said washing tray, a removable stand pipe in said
and ?xing bath‘ trays supported uponand par
wash tray, a drain pipe extending below the bot 20 tially immersed Within said sink within a ?uid
tom thereof, a stand pipe in said sink, into which
therein, a washing tray supported upon and dis
said Wash tray drain may be removably inserted
posed Within said sink with its under surface
in axial alignment, and a second drain pipe
above the level of ?uid therein, a ?uid source
joined, to said sink stand pipe and disposed
to said washing tray, a removable stand pipe in
through said sink and said insulated support for 25 said wash tray, a drain pipe extending below the
conducting ?uid from said wash tray independent
bottom thereof, a stand pipe in said sink, into
of the ?uid within said sink.
which said wash tray drain may be removably
3. Apparatus for processing exposed ?lm for the
inserted, and a second drain pipe joined to said
making of lithographic plates comprising an in
sink stand pipe and disposed through said sink
sulated support, a temperature controlled sink 30 and said insulated support for conducting ?uid
nested within said insulated support, developing
from said wash tray independent of the ?uid
and ?xing bath trays supported upon and par
within said sink.
tially immersed within said sink within a ?uid
JAMES T. CAMPBELL.
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