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Патент USA US2406821

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Sept. 3, 1946.
vQA. Fox
\ 2,406,821 .
HEÀT PROCESSING MACHINE
File‘d Feb. 20, »1942
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Sept. 3, 1946.
2,406,821
v. A. Fox
HEAT PROCESSING MACHINE
Filed Feb.< 20, 1942
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Sept. 3, 1946.
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HEAT PRÓ-CESS ING MACHINE
Filed Feb. 2o, 14942
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HEAT PROCESSING MÀCHI???
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2,406,821
Patented sept. 3, 1946
UNITED STATES i PATENT OFFICE
2,406,821
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HEAT PROCESSINGMACHINE
vernie A. Fox, Denim, Mich.
Application February 20, 1942, Serial No. 432,541
(o1. 34-s6>
6 Claims.
2
1
This invention relates to heat processing ma
chines, and in particular to conveyor-type heat
lower edge accessible for engagement by other
portions "of the machine yet providing an elon
processing machines, `
gated central support for several different sizes
One object of 'this invention is to provide a
heat processing machine for automatically con
veying and heat-processing sheets or plates of
of sheets or plates.
Another object is to provide a heat processing
machine as set forth in the preceding objects
material such as lithographed plates.
» wherein cooling devices are provided adjacent
'
the outlet of the machine for cooling the heated
sheets or plates being processed by the machine.
Another object is to provide a heat processingr
machine wherein the sheets of material to be
in the drawings:
‘
heated are conveyed in carriers through an oven 10
Figure 1 is aside elevation, partly in section,
wherein they are subjected to heated air currents
of> the outlet end’of` a heat processing machine
proceeding upwardly and downwardly in a zig
according to a preferred embodiment of the pres
zag path in the opposite direction to the direction
ent invention.;
of travel of the sheets.
,
Fig. 2 is a view similar to Fig. l, but showing
Another object is to provide a heat processing 15
the inlet end and~ adjacent machinery;
machine with an endless conveyor which is nor
Fig. 3 is a horizontal section along the line 3-3
mally driven from a source of power which also
in
1, with the sheet carriers removed to dis
drives other machinery, such as coating and/or
close the construction more clearly;
printing machinery, automatic means being pro
Fig. 4 is a horizontal section similar to Fig. 3
vided for connecting in an auxiliary source: of
but taken along the line 4-4 in Fig. 2;
power when this machinery ceases operation;
Fig. 5 is across section along the line 5--5 in
Another object is to provide a heat processing
Fig. 1; machine having an oven into which articles‘are
Fig. 6 is aside elevation of a portion of a con
conveyed upwardly at the inlet and downwardly
toward the outlet, thereby conserving heat by -25 veyor `chain `with the sheet -carriers mounted
reducing the escape of the heated air normally
Fig. 7 is a horizontal section along the line 1--`|A
occupying the upper portion of the oven.
in Fig. 6;
y
_
x
Another object is to provide aheat processing
Fig. 8 is a vertical section along the line 8--8
machine as set forth in the previous object
'
wherein means is provided at the outlet end of 30 in Fig. 6;
Fig. 9 is a detail view of the clutch shown in
the machine for momentarily advancing the
the lower central portion of Figs. 2 and 4;
lower edge of the sheet faster than the upper
`
thereon;
ì
f
Fig. lO is a diagrammatic side elevation of the
conveyor at the outlet end of the machine, show
35 ing the means whereby the lower edge of the
slicing or buckling.
`
‘sheet or plate is momentarily advanced more
Another object is to provide a heat processing
rapidly than the upper edge so as to make it fall
machine having a travelling conveyor with sheet
without injury;
.
carriers spaced at intervals therealong, these
Fig, l1 is a circuit diagram of the electrical,
sheet carriers being constructed and arranged
with elongated central supports to convey either 40 fuel and air circulation systems.
large or small sheets without leaving the lower
edge so that when the sheet falls as it nears the
end of the conveyor it will not be damaged by
edge unsupported at its ends.
,
Another object is to provide a heat processing
General arrangement
In general, the heat processing machine of this
inventori includes an oven within downwardly
culating system and a heating system, automatic 45 inclined ends for conserving heated air which
machine including an oven having an air cir
means being provided for delaying the starting
of the heating system a predetermined time pe
riod after the starting of the air circulating sys
‘ is circulated through the oven by fans or blow
ers. An endless conveyor moves through the
oven and is provided with spaced sheet carriers
tem, so that all explosive or inflammable gases
at intervals therealong. The sheet carriers con
will be automatically cleared out of the oven
. sist of open frames (Fig. 5) having gaps at the
before heating commences.
" bottom thereof to permit engagement of the `sheet
,
`
i
Another object is to provide a carrier forsheets
with other conveying apparatus yet having a
of material consisting of a framework of Vrods
or bars adapted to be carried by a conveyor and
mid-portion of the lower edge of a large sheet
having provisions for leaving portions of the
or >‘the end portion‘of a smallsheet, thereby
downwardly depending central supportl for the
3
2,406,821
adapting the conveyor for conveying various sizes
ing motor 23 to drive the machines i9, 20 and
2| together with the conveyor I l by the motor
22, or optionally to drive the conveyor I I alone
of sheets without changing the sheet carriers.
The machine conveyor is normally driven from
a main motor which also drives other processing
machinery, such as printing and/or coating ma
chines.
by means of the auxiliary motor 23. The drive
from the main motor shaft 24 is conveyed to the
shaft 25 of the machine I9 by a belt or chain
26 interconnecting the pulleys or sprocket 21 and
Such printing and coating machines
are employed where it is desired to imprint a de
sign or message upon the sheets, and preferably
28 (Fig. 4).
to varnish these, the oven being employed to dry
The shaft 25 carries a pulley‘or sprocket 29
the sheets after they have been thus treated. 10 which drives a pulley or sprocket 30 by means
An auxiliary motor is also provided for driving
of a chain or belt 3|. The sprocket or pulley 3G
the conveyor, together with automatically opera- _ ._ vis loosely mounted upon a shaft 32 mounted in
tive mechanism which immediately connects the
brackets 33 and drives the shaft 32 through a
auxiliary motor when the main motor is halted, - A ~ jaw clutch 34.
The shaft 32 carries a bevel gear
thereby permitting the printing and/or coating 15:. 35 meshing with a bevel gear 36 mounted
machines to be operated intermittently while the
’ on
a
shaft
3l.
The latter is connected by
conveyor operates continuously over a given pe- *Í -~ lmeans of a jaw clutch 38 to the auxiliary driv_
riod of time.
ing motor 23 by means of a sprocket or pulley
The spacing of the carriers along the conveyor>
39 mounted loosely upon the shaft 37. The shaft
and the mounting of the carriers at their oppo 20 3'!A y,extends lengthwise of the machine and the
site ends on a pair of >parallel conveyors enables
pulley or> sprocket 39 is driven by a chain or belt
the central portions to be maintained compara"
4I from a pulley or sprocket 42 mounted on the
tively free from obstructions. Heaters and blow
shaft 43 of the auxiliary motor 23. The shaft
ers are provided for circulating heated air up
3l ‘also _carries a sprocket or pulley 44 driving
ward and downward between the sheets on their 25 a ~sprocketor' pulley 45 by means of a chain or
carriers in a zigzag path, this heated air being
belt 46. The sprocket or pulley 45 is mounted
finally exhausted from the oven by an exhaust
upon the input vshaft, 4l of a reduction gear set
fan located near the inlet of the oven, thereby
48, the output shaft 49 of which is mounted trans
causing the heated air to travel in the opposite
versely in the machine frame members 5i] and
direction to the conveyor and sheets. An electri 30 carries a pair of sprockets 5I meshing with the
cal circuit is provided whereby the heatersare
conveyor chains 52. The shaft 3l (Fig. l) is
delayed from starting in operation a predeter
rotatablyv supported in brackets 53 mounted on
mined time after the fans are started, so that
the oven supports 54 and upon the outlet sup
the latter may remove any inflammable gases
port 55, and at its outer end carries a sprocket
which may have collected within the oven, there
" or pulley 56 driving a sprocket or pulley 51 by
by preventing accidental fires or explosions from
meansy of-a chain or belt 58. The sprocket or
such gases being ignited by the heaters. Cooling
pulley 5l is mounted upon the input shaft 59 of
fans are provided adjacent the outlet of the ma
a?reduction gear set 60, the output shaft 5I of
chine for cooling the sheets so that they may be
which' carries a pair of sprockets 62 driving the
removed by hand if desired.
outletïends of the main conveyor chains 63 of
An auxiliary conveyor is provided at the outlet
the conveyor I l, the inlet ends of which are driven
end of the machine for temporarily moving the
by thefsprockets 5I upon the shaft 49. The shaft
lower edges of the sheets ahead of the upper
Sigis likewisely mounted transversely upon the
edges, so that as the carriers swing downward at _ outlet frame members E4. The shaft 62 also car
the ends of the conveyor the sheets will fall gent 45 ries a‘bair of auxiliary conveyor sprockets 65
ly and without shock, thereby preventing damage
to the sheets and possible injury to the machine
and operators. A withdrawal conveyor is rpro-~
vided adjacent this auxiliary conveyor for carry
Y
ing away the sheets as they are unloaded from 50
the oven conveyor.
Machine driving mechanism
driving the Àsprockets S6 vupon the shaft 61 by
means of the belts or sprocket chains 69 of the
auxiliary conveyor I3 (Fig. 3). The auxiliary
conveyor-shaft 6l is mounted in brackets 69 sup
ported upon the outlet frame members 64. The
latteralso carry brackets "IG rotatably supporting
the shafts ,'II carrying pulleys or sprockets l2
driving the belts or chains 73 of the withdrawal
Referring to the drawings in detail, Figs. 1 to
_ conveyor I4. The latter is also provided with an
4 inclusive show the heat processing machine of 55 intermediate sprocket- or pulley 'I4 mounted upon
this invention as consisting of an oven generally
a shaft 15 (Fig. l0)v supported in brackets 'IG and
designated I0 containing an endless conveyor gen
driving an intermediate belt or chain TI.
erally designated II having sheet carriers gener
The jaw clutches 34 and 38 are of similar con
ally designated I2 mounted thereon and moving
struction'in that they arearranged to drive their
in an orbital path, An auxiliary conveyor, gen
particular shaft in one direction and to slip rela
erally designated I3 and a withdrawal conveyor
tively thereto in the _opposite direction. Accord
generally designated I4 are provided adjacent the
ingly a single description sufñces for each of the
left-hand or outlet end of the machine (Figs' 1
clutches 34 and`33 (Fig. 9), the clutch 38 being
and 3). Air circulation fans I5 are provided for , selectedfo'r'this purpose. The clutch 38 consists
circulating air heated by burners I6 through the
of a drivingimernber "e8 connected to the pulley
spaces between the sheet carriers I2 and in a
direction opposite the direction of travel of the
conveyor II toward an exhaust fan I -I located
near the inlet I8 of the oven I0 (Fig. 2).
Also located adjacent the oven inlet `I8 is a
printing machine I9, a coating machine >2li and
a feeder 2I located therebetween. The machines
I9,- ZGand 2l in themselves form no part of the
present invention, except as to their main driving'
motor 22 which cooperates with an auxiliary driv
39 and having jaw portions 'I9 interconnected by
inclined portions 89. The pulley 19 is loosely
rotatableup'on "thel shaft 31, and seats against a
,collar- BI `'pinned as at 82 to the shaft 31. Co
‘operatin'g- with the clutch member ‘Ißis a clutch
member 83 having driving shoulders or jaws 84
interconnected-by inclined portions 85, the clutch
member 83" being keyed or splined to the shaft
, 3l' as at 85,) so as_to be slídable longitudinally
i along the --shaft'â‘l by means of a spring 8l seated
2,466,821
5
against a collar 88 pinned as at 89 to the shaft
31_ vIn this manner eachl clutch 34 or 38 drives
its shaft 32 or 31 in oneÍ direction butslips and
clicks withoutfdriving vconnection when the drive
is in the opposite direction.
"
Y
'
`
"
The purpose of the clutches 34
scribed in connection with‘the operation of the
machine, is to perrnîtthe conveyor I I to‘be driven
Y normally 'by the main driving motor 22 when
the machines |9`and 2|) are in operation, yet to
permit the auxiliary driving motor 23 to drive
the conveyor II when the main driving motor
22 is halted and the machines I9 and 20 are shut
down. bln this way the sheets or plates 9|] (Fig.
l0) whichfhave been printed and possibly coated
are carried through‘the oven Il) and dried even
after the machines I9 and `20 and their driv
ing motor 22 have ceased operation. .
Oven construction
The oven I!! is an elongated box-like structure
with side walls 9| (Figures 3 and 5), a-top 92,
and a bottom 93.
The oven also has inlet and
outlet ends S4 and 95 respectively (Figs. 1 and 2).
(Fig. `5). The latter areconnected to longitudinal
angle members, |24 and also carry spaced longi
tudinal members |25 between `which the air may
circulate freely.
Conveyor and carrier construction
`The conveyor II and carriers |2`include the
conveyorlchains E3 mounted upon the guide rails
H8 and ||l as previously described. rThe con
veyor chains E3 consist of links 225 and |21 piv
otally connected to` pivot pins |28 carrying rollers
|29 <which roll along the~top edges of the guide
rails II'I` and I lil. The pivot'pins |23 are pro
videdon one side with heads `|29 and on the other
side areheld in place by cotter pins |33. Mounted
adjacent thelinksIZl are angle members `|3|
which extend out over the links |21 and provide
rests for the lower edges of the sheets or plates
3|] which form the work pieces handled by the
machine. Adjacent the opposite links |25 are
mounted channel members |32 having aligned
apertures |33 and |34 (Fig. 8) through which
pass the side portions .|35 of the carriersl2.
These side portions |35 are biiurcated as at |35
and spread apart after their insertion so as to
The inlet end 94 for the purpose of conserving 25 prevent their accidental withdrawal.
heat is directed downwardly toward the inlet
The side portions |35 are bent inwardly to form
lil. The inlet end 94 is provided with a port 96
top portions |33 and |31. The top portion |31
communicating with the conduit 91 in a casing ` is bent downwardly in a diagonal portion |38
s3 containing the exhaust-fan I1 for creating a
(Fig. 5) `to the portion |35 in any suitable way,
suction to remove air which has traversed the 30 as by sp-ot welding; The top portion |38 is bent
oven and to discharge this air into the discharge ‘
diagonally downwardly in a portion Mb which
conduit 99.
is secured at lthe top portion le! to the diagonal
The outlet end 95 of the oven I 0 (Fig. 1) is
portion
|38. A diagonal portion |22, also secured
provided with an outlet |00 communicating with
at the top portion |l|3 to the diagonal portion
a hood or vestibule IGI likewise for the pur 35 §38, continues downwardly to a junction at the
pose of conserving heat and minimizing the escape
of the heated air. Bañies |62 are distributed at
intervals along the interior of the oven Iii for
impeding the direct passage of the air from one
end of the oven to the other so as to force it' -
downwardly between the sheets 96 as they are
carried along by the conveyor II upon »the car
riers I2. One of the walls 9| of the oven is pro
vided with doors HB3 for permitting access to thel
burners I6 and other portions of the interior of
the machine.
v
‘
a
The burners I6 are shown as gas burners but
other types may obviously be employed. The~ air
heated by the burners is circulated by the fans
or blowers I5, which are 'located in casings | |14
having inlets or intakes IBEAandoutlets or ex
top portion |44 with the other side member |35.
Secured at its opposite ends M5 to the diagonal
members |38 and |62 is a vU-shaped downwardly
extending frame |46 having side portions |41
and a cross portion >Idd at thebottom thereof.
Secured to the bottom portion M8 at the corners
oi the frame lli@ are sheet'supports léi‘el. The
sheet supports are inclinedupwardly as at Mila
(Fig. 6), and `serve to support the lower edges of
thesheets 9d. j
,
The carriers i2 are ,thus‘spaced at `intervalsy
along `therchain 63 and are inclined upwardly »so
that the sheets or plates di! rest in inclined posi
tions’as they travel through the oven (Fig. 6).
The downwardly extending `frame its with its
supportsk |49 enables sheets smaller than theV
maximum size sheets to be conveyed, hence there
hausts |06. The blowers I5 are operated by shafts
Ic'imounted in brackets |08 (Fig. 5) secured to
is no necessity for changing the carriers l2 for
the walls 9|. The shafts |û1 carry pulleys |69
diiierent sizes of sheets. Moreover, the open
55
driven by belts III) from pulleys III upon the
spaces between the side members £35 and |46
shafts I I2 of motors I I3. The latter are mounted
permit the lower edges of the plates to be engaged
upon brackets I I4 beneath the longitudinal frame
by the auxiliary conveyor 65| (Fig. l0) which
members II5 interconnecting the oven supports
5d. The brackets I|4 are also matched by corre--
sponding brackets i IB on'the opposite side of the
machine (Fig. 5) and these together support the
angle guide rails ||1 upon which the conveyor
chain E3 travels on its return path. »
"
The'interior oi the oven is likewise provided
with angle guide rails I i8 which support the con
veyor 53 in its travel through the oven, and these
guide rails `I Ill` are inclined downwardly at the
opposite ends ofthe oven. Cooling fan motors
H9 provided with fans |20 incasings |2I are
passes through these spaces and serves to advance
the lower edges of the sheets 9S ahead of their
upper edges as previously described above. `
Heating, driving and air circulating systems`
` Figure 11 shows diagrammatically the system
whereby the various motors are energized and the
various burners and blowers controlled, The
system consists broadly of an electrical circuit for`
energizing the various blower motors |1, I I3 and
IIB, a fuel `supply system consisting of piping
located near the outlet end 95 of the oven so as 70 controlled by a magnetically operated master
valve and magnetically operated burner valves,
to cool the sheets or plates 90 as they emerge
and an electrical safety circuit controlled by ther
from the vestibule or hood |!.'||.
mostatic switches so that the gas burner valves
Near the oven outlet Icll the guide rails II8
remain open only while the temperature is high
are supported by a cross member 22 and else
where within the oven by cross members |23 755 and close when the‘temperature drops. A tirne~
2,406,821
7
delay relay inserted in the circuit of themaster
magnetic valve delays the opening of this valve
until the blower motors I|3 have been in oper
Thus, when the blower motors I|3 are operated,
the'contactor switches |92, |93 and|94 close
and the switches 200 likewise close to permit
ation a predetermined length of time so as to
clear the oven of inflammable or explosive gases
before the burners can be ignited.
current to energize the time-delay relay 203.
of the oven of all explosive gases. Leading from
the power lines |54, |55 and |56 are auxiliary
pursue its orbital path through the oven I0 and
>After the latter has run through its cycle, it ener
gizes the operating coil of the gas supply valve
In particular, the electrical system consists of
|68 through the lines 205 and 206 opening this
power current supply lines |50 to |52 having a
normally closed valve. Thus, gas is not admitted
single throw switch |53. This controls the ener
to the gas line |69 until the blower motors ||3
gization of the blower motor energization lines 10 have been operating a predetermined time.
|54, |55 and |56 leading to the blower motors
Operation
I|3 and I|9 and also to the exhaust fan motor
I1. Consequently when the switch |53 is closed,
In the operation of the machine of this inven
the blower motors I1, ||3 and ||9 start in oper
tion, the main and auxiliary driving motors 22
ation, permitting the blowers to clear the interior
and 23 are energized to cause the conveyor I| to
also to drive the printing press I9 and coating
machine 20. The switches |53 are then closed,
energizing the blower motors I1, | I3 and I I9, and
air compressor I 6I. The latter has an intake 20 causing air to flow through the oven in a cir
|62 and a discharge conduit |63 leading by branch
cuitous path opposite the direction travel of the
lines |64 to electrically controlled proportional
conveyor II. The baiiies |02 cause the air to
mixers |65. The branch lines |64 contain manual
move up and down between the carriers I2, so
air valves |66.
that the air follows a zigzag path as indicated
Fuel gas is supplied to the proportional mixers 25 by the arrows in Figures 1 and 2.
|65 from the gas supply line |61 by way of the
The operator now closes the switches |9| and
magnetically operated valve |68, the gas supply
|84 to energize the control circuit. The air oper
line |69, the branch lines |10, the manual gas
ated valves 200 then close under the influence of
valves I1| and the magnetically operated gas
the blast of air from the blowers, thereby closing
valves |12. From the proportional mixers |65 30 the circuit to the time-delay relay 203 through
the conduits |13 lead to the burners I6. Asso
the contactor switches |92, |93 and |94, which
ciated with each burner I6 is a thermocouple |14
have been closed since the blower motors II3
which generates current when it is heated by
were energized by the closing of the switch |53.
the burner I6. This current is conveyed through
After a predetermined time, the gas valve I 68
the lines |15 and |16 to the operating coil of the 35 opens after being energized by the time-delay re
normally closed gas valve |12 to maintain it open
lay at the end of its cycle and fuel gas passes
power lines |51, |58 and |59 for energizing the
air compressor motor |60 which operates the
while the burners I6 are alight but to permit the
gas valves |12 to close when the burners are not
from the conduit |61 into the conduits |69 and
|19, Meanwhile, air has been supplied by the
lighted. The normally closed magnetic valves
compressor |6| to the conduits |63 and |64 lead
|12 are provided with manually operated valve 40 ing to the proportional mixers I 65. It is, of
members |11 by which the valves |12 may be
course, assumed that the manual valves |66 and
manually opened when the burners I6 are ignited.
I1I have been opened.
The proportional mixers I 65 are under the con
The operator now opens the normally closed
trol of thermostatic bulbs |18 connected by the
gas valves |12 by pressing upward 0n the valve
lines |19 to the temperature control instruments
members |11, permitting gas to flow from the
|80 which in turn are connected by the lines
conduits |10 into the proportional mixer |65.
|8I, I 82 and |83 to the proportional mixers |65.
The motors of the latter have been energized
The latter are likewise under the control ofthe
through the lines |85 and |86 by the closing of
switches |84 connecting the lines |85 and |86
the switches |84, and consequently mixed gas is
to the lines |81 and |88. The lines |81 and |88 50 suppliedto the burners I6 through the conduits
are energized from the current supply lines |89
|13. The operator lights the burners I6, holding
and |90 under the control of the single throw
up the valve members |11 manually until the
switch ISI.
heating of the thermoccuples |14 generates
The electrical circuit (Fig. 11) includes the
enough current to energize the operating coils
contactor switches |92, |93 and |94 having oper 55 of the magnetic gas valves |12, a suñicient
ating coils |95, |96 and |91 respectively con
amount to hold them open. If the temperature
nected either to the power lines |54 and |56 or to
rises and falls in the oven, the thermostatic bulbs
the power lines |51 and |59. The contactor
|19 and the temperature control instruments |80
switches I 92, |93 and |94 are normally open, and
so regulate the proportional mixers |65 that the
are closed by the energization of their operating 60 ratio of air to gas remains the same while the
coils |95, |96 and |91 in response to the closing
volume is varied in order to maintain a substan
of the switch |53. The latter, when closed, ener
tially constant temperature within the oven I0.
gizes the blower motors I I3 and causes the blow
In the meantime, the printing machine |9 and
ers to operate.
coating machine 20 have been imprinting designs
Running from the current line |88 is a line | 98 65 on the sheets 20 of tin or other material, and
which continues in the line |99 beyond the con
these have been deposited upon the carriers I2 as
tactor switch |92. The line |99 is provided with
the conveyor II moves them through the oven.
a series of normally-open air-responsive switches
The heated air circulates in a zigzag path through
200 which are closed automatically when the
the spaces between the carriers and the sheets,
blower motors | I3 are operating, thereby permit 70 and follows a general direction opposite to the
ting current to be transmitted to the contactor
direction of travel of the conveyor II, due to the
|93, thence through the line 20| through the con
tactor |94 to the line 202 leading to the time
delay relay 203, from the opposite pole of which a
line ‘204 leads to the current supply line |81.
operation of the exhaust chain 98. As the sheets
or plates 90 emerge from the vestibule |0|, they
are cooled by the drafts of cool air coming from
the cooling fans |20 operated by the motors |I9.
2,406,821
White the carriers“ I2 move over the‘auxilîary
ranged inseries with`their intakes toward said
conveyors 68, the latter extend into'fthe'spaces
in the bottom edges of the carriers l2,engaging
'oven outlet and with their exhausts toward said
voven inlet, said blower exhausts having upwardly
directed baille portions disposed between adja
the bottom edges of the sheets 9D; Since the aux
iliary conveyors Bâ are moving more rapidlythan
the main conveyor chains 63, the bottom edges
of the sheets or plates lill are moved ahead of their
top edges (Fig. 1G) so that ¿as the carriers I2
cent blowers whereby to move heated air along
a vertical zigzag path in a direction opposite to
the direction of conveyor travel,- one of said
blowers being positioned adjacent said inlet end
to directa blast of air thereacross and form an
the sheets @il lie flat against the back of each 10 air wall thereatfand an exhaust fan disposed in
swing downwardly around the shaft 62`-as an axis,
carrier, until they arrive at the withdrawal "con
veyors 'E3 and l1. The latter conveyors then con
vey the sheets to thenextfstagebf operations
such as the forming oi"V cans from the sheets.
one of the walls of the inclined inlet end to re
move combustible gases fro-m said oven.
"3. In `a heat processing machine, an elongated
oven.~having downwardly inclined inlet and out
If at any time the gas supply is‘accidentally 15 let- ends with ia substantially horizontal inlet, a
interrupted, the thermocoupl'es VM1 immediately
cease to generate current and the magnetic valves
l’lâ automatically close. This cuts off the supply
of gas to the burners It which cannot thereafter
be lighted until the switches |12 are manually 20
opened as previously described, Meanwhile, the
auxiliary driving motor 23 has also been operat
ing but it has failed thus far-to drive the shaft
3l since the automatic body clutch 38 prevents
this by the slippage of the clutch members 18 and
83 relatively to each other (Fig. 9).
`conveyor movable upwardly through said inlet
end ‘and through said oven, a series of ‘racks ar
ranged on said conveyor for supporting sheet ma
terial onv edge during its passage through said
oven and in a substantially horizontal position
‘ during its passage through said inlet, heating
means in said oven, a plurality of blowers be
neath said conveyor arranged in spaced apart re
lation for directing blasts of heated air upwardly
through said conveyor and between said sheets
of material, de?lector means mounted 0n the roof
of the oven for directing said heated air in a
downward direction toward the intake of an ad
jacent blower, means for driving said blowers,
If now the desired quantity of sheets or plates
have been printed and coated and the main driv
ing motor 22 is shut down to halt the machines
I9 and 20, the shaft 25 and the pulley or sprocket 30 means for driving said conveyor, and an exhaust
fan disposed in one of the walls of the inclined
til immediately come to restl Due to the provi
inlet end for removing combustible gases from
sion of the automatic jaw clutches 34 and 3Q,
said oven.
however, the auxiliary driving motor 23 now
4. In a heat processing machine, an elongated
drives the shaft 3l through the jaw clutch 33
_oven having downwardly inclined inlet and out
while the clutch members of the jaw clutch 34 slip
let ends with a substantially horizontal inlet, a
relatively to each other.
conveyor movable upwardly through said inlet
While a specilic embodiment of the invention
end and through said oven, a series of racks ar
has been described and illustrated, it vwill be
ranged on said conveyor for supporting sheet
understood that various modifications may be
made within the scope of the appended claims 40 material on edge during its passage through said
oven and in a substantially horizontal position
without departing from the spirit of the inven
during its passage through said inlet, heating
tion.
means in said oven, a plurality of blowers beneath
What I claim is:
said conveyor arranged in spaced relation, for
l. In a heat processing machine, an elongated
directing blasts of heated air ,upwardly through
oven having a downwardly inclined inlet end
said conveyor and between said sheets of ma
with a substantially horizontal inlet, a conveyor
terial, deflector means mounted on the roof of
movable upwardly through said inlet end and
the oven for directing said heated air in a down
through said oven, rack members carried by said
ward direction toward the intake of an adja
conveyor for supporting sheet material on edge
cent blower, means for driving said blowers,
while being conveyed through said oven and to
means for driving said conveyor, and an exhaust
extend transversely of said inlet end and par
fan disposed in one of the walls of the inclined
tially close said inlet, heating means in said
inlet end for removing combustible gases from
oven, a series of blowers arranged beneath the
said oven, said blowers being arranged t0 create
conveyor in said oven for directing heated air
upwardly between said conveyor and the sheet 55 a forced draft from one end of the oven to the
other in a direction opposite to the direction of
material thereon, one of said blowers being dis
conveyor movement.
posed adjacent said inclined inlet end 'to direct a
5. In a heat processing machine, an elongated
blast of heated air transversely thereacross, and
oven having-downwardly inclined inlet and outlet
an exhaust fan disposed in one of the walls of
said inclined inlet end for removing combustible 60 ends with a substantially horizontal inlet, a con
veyor movable upwardly through said inlet end
gases from said Oven.
,
and through said oven, a series of racks arranged
2. In a heat processing machine, an elongated
on said conveyor for supporting sheet material
oven having downwardly inclined inlet and out
on edge during its passage through said oven and
let ends with a substantially horizontal inle't, a
conveyor movable through said inlet end and` ~ in a substantially horizontal position during its
passage through said inlet, heating means in said
along said oven with the lower course thereof
oven, a plurality of blowers beneath said con
returning to said inlet end externally of said
veyor arranged in spaced apart relation for di
oven, a series of racks arranged on said conveyor
recting blasts of heated air upwardly through
for supporting sheet material on edge during its
travel through said oven, said racks being ar 70 said conveyor and between said sheets of mate
rial, deflector means mounted on the roof of the
ranged to support the sheet material in a sub
oven for directing said heated air in a downward
stantially horizontal position during its passage
direction toward the intake of an adjacent
upwardly through said inlet end. to partially close
blower, means for driving said blowers, means
said inlet, heating means located in said oven, a
for driving said conveyor, and an exhaust fan
plurality of blowers beneath said conveyor ar
2,406,821
ll
disposed in one of the' walls of the inclined inlet
end for removing combustible gases from said
oven, and fan means mounted in close proximity
to said outlet for directing a blast of cool air
upwardly between said sheets of material as they
pass from said oven.
6. In a heat processing machine, an elongated
oven having downwardly inclined inlet and outlet
ends with a substantially horizontal inlet, a con
t
12
recting blasts of heated air upwardly th‘rough
said conveyor and between said sheets of ma
terial, deflector means mounted on the roof of
the oven for directing said heated air in a down
ward direction toward the intake of an adjacent
blower, means for driving said blowers, means for
driving said conveyor, an exhaust fan disposed
in one of the walls of the inclined inlet end for
removing combustible gases from said oven, said
veyor movable upwardly through said inlet end 10 blowers being arranged to create a, forced draft
and through said oven, a series of racks arranged
from one end of the oven to the other in a direc
on said conveyor for supporting sheet material on
tion opposite to the direction of conveyor move
edge during its passage through said oven and
ment, and fan means mounted in close proximity
in a substantially horizontal position during its
to said outlet for directing a blast of cool air
passage through said inlet, heating means in said
upwardly between said sheets of material as they
oven, a plurality of blowers beneath said con
veyor arranged in spaced apart relation for di
pass from said oven.
VERNIE A. FOX.
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