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oct 22, 1946.
~13mm-mm1 m1.
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2,409,725
AUTOMATIC MOLDING 0F PLASTICS
Filed April 4, 1941
9 >s?eets-sheet 1
Oct. 22, 1946.
>2,409,725
J. B, WHITMORE ETAL
AU'rolATIc uoLDING 0F PLASTICS
Filed April 4, 1941
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INVENTORS
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BY ß”. anew/canals'
ATTORNEY
Oct. 22, 1946.
J. B. wHrrMoRE ET A1.
2,409,725
AUTOMATIC MoLDÀI'NG 0F PLAsTIcs
Filed April 4, 1941
9 Sheets-Sheet 3
INVENTORS
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BY RßJw-wc‘a/vßr
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Oct. 22, 1946.
J. B. wHl'rMoRE :TAL
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'AUTOMATIC MOLDING 0F PLASTICS
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ATTORNEY
Oct- 22, 1946~v
J. B. wHrrMoRE Erm.
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.’AUTO“ATIC MQLDÍNG OF PLASTICS
Filed April 4, 1941
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Oct. 22, 1946.
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AUTOMATIC MQLDING OF PLASTICS
Filed April 4, 1941
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AUTOMATIC MOLDING oF PLASTICS
Filed April 4, 1941
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INVENTORS
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BY F. fr. „Eu/ranzig
TTORNEY
Patented Oct. 22, 1946
2,409,725
UNITED STATES PATENT OFFICE
2,409,725
'
AUTOMATIC MoLnING oF PLASTICS
James B. Whitmore, Bloomfield, William Maken
ny, Mountain View. and Frank A. Newcombe,
Nutley, N. J., assignors to Westinghouse Electric
Corporation, East Pittsburgh, Pa., a corporation
of Pennsylvania
Application April 4, 1941, Serial No. 386,790
8 Claims.
l
(Cl. 18-16)
2
This invention relates to the automatic mold
ing of plastics, and more particularly to means
for automatically loading a molding press with
the plastic material in the form of tablets or
pellets, operating the press to form the material,
and then unloading the articles formed.
The principal object of our invention, gener
ally considered is to make entirely automatic the
operation of molding plastic materials, where
high temperatures and pressures- are important,
to form articles such as radio tube bases, where
by pellets or tablets of plastic material may be
the ,line III-III of Figure 1, in the direction of
the arrows.
Figure 4 is a vertical sectional view on the line
IV-IV of Figure 3, in the direction of the arrows,
but showing the press in the open position.
Figure 5 is a fragmentary elevational view of
=the lower portion of the press shown in Figure 4,
in the same direction as the arrows on the line
IV-IV of Figure 3.
Figure 6 is a longitudinal sectional view of the
pellet feeding hopper and associated mechanism,
on the line VI-VI of Figure 9 in the direction of
the arrows.
fed to a hopper at one side of a machine and
automatically delivered therefrom at the other
side.
'
iAnother object of our invention is the provision
of a hopper which receives tablets or pellets of
Figure 7 is a partial end elevational view and
15 partial vertical sectional view on the line VII-_VII
of Figure 6, in the direction of the arrows.
Figure 8 is a fragmentary vertical sectional
View on the line VIII-VIII of Figure 7, in the
plastic material and automatically delivers one
of said pellets to each of pockets provided in a
loading board.
direction of the arrows.
20
Figure 9 is a horizontal sectional view on the
A further object of our invention is the pro
line IX-IX of Figure 6, in th e direction of the
vision of a loading board which receives tablets
arrows.
or pellets of plastic material from a feed hopper
Figure 10 is an elevational view of the mech
and automatically places one of said pellets in
anism inside of the cam box beneath the loading
each mold element of an automatic molding ma 25 hopper.
chine, and then passes back to said hopper for
Figure 11 is a vertical sectional view on the line
recharging.
XI-XI of Figure 10, in the direction of the arrows.
A still further object of our invention is the
Figure 12 is an enlarged fragmentary vertical
provision of means for automatically raising the
sectional view, corresponding to Figure 6, show
name plates in the bottoms of mold elements of 30 ing the positions of the parts with the loading
an automatic molding machine, in order to lift
hopper in the next position preparatory to charg
the molded articles therefrom, simultaneously
ing the loading board.
move a stripper fork beneath said molded `ar
Figure 13 is a view corresponding to Figure 12,
ticles, and then blow the latter to a discharge
but showing the positions of the parts when the
trough 'for removal from the machine.
35 loading hopper valve has been moved to the next
An additional object of our invention is the
position to charge the loading board.
provision for >automatically cleaning the mold
Figure 14 is a horizontal sectional view on the
elements, or removing what is called “flash”
line XIV-XIV of Figure 13, in the direction of
therefrom, after each charge of articles molded
the arrows.
therein has been removed.
40
Figure 15 is an enlarged fragmentary vertical
Other objects and advantages of the invention,
sectional View, corresponding to Figure 4, but il
relating to the particular arrangement and con
lustrating the loading board on its way to a posi
struction of the various parts, will become ap
tion above the lower mold elements of the press.
parent as the description proceeds.
Figure 16 is a view corresponding to Figure 15,
Referring to the drawings illustrating our in 46 but showing the loading board as it is depositing
vention:
pellets of plastic material in said lower mold ele
Figure 1 is a side elevational view of a com
ments.
Figure 17 is a View of the lower mold elements
of the press, as illustrated in Figure 16, but
the press in closed position.
50 showing portions of the air lines and the positions
Figure 2 is a diagram showing the sequence of
of the parts after the loading board has been
one cycle of events which take place during oper
withdrawn and the name plates or lower portions
ation of a machine such as shown in Figure'l.'
of said mold elements raised to remove the molded
_ Figure 3 is a front elevational view of the mold
articles, but before the stripper fork has moved
ing press, or right hand part of the apparatus. on 55 inwardly therebeneath.
plete machine embodying our invention, with
4
3
l. Assuming the loading hopper contains a sup-V
ply of pellets or tablets of plastic material,
Figure 18 is a fragmentary plan of the portion
of the stripper fork and lower mold elements as
shown in Figure 17.
Figure 19 is a View corresponding to Figure
17, but showing the positions of the parts when Ul
these pellets are fed, a few at a time, to dis
tributor plates in the bottom of said hopper,
as illustrated generally in Figure 6.
. A `charge of pellets is delivered through said
the name `plates have been lowered, after the
7distributor plates to a loading board carried
on Wheels, while the same is disposed be
neath said hopper, as illustrated most
clearly `in Figures 12 and 13.
3. The vloading board is moved from beneath the
stripper fork has moved beneath the molded
articles, leaving the latter resting thereon in line
with blasts of air from nozzles for removing to a
discharge chute.
Figure 20 is a fragmentary plan of the portion
of the stripper fork and lower mold elements as
shown in Figure 19.
Figure 21 is a piping diagram for the air and
hydraulic press mechanism.
Figure 22 is a wiring diagram for the feeder
mechanism and cam-operated switches, and
Figure 23 is a wiring diagram for the molding
press and timer.
loading hopper to above the lower mold
elements of the molding press, as shown
most clearly in Figure l5.
4. The pellets are dropped from the loading
`board into the lower mold elements of the
ress, as shown most clearly in Figure 16.
5. The loading board is moved back to recharg
ing position illustrated most clearly in Fig
'
The Makenny et al. Patent No. 2,197,528, 20
dated April 16, 1940, discloses a 4molding press
which is automatic, in the sense that after loading
with plastic material it will, upon the mere push
ing of a button, mold the material for a pre
determined length of time and then automatically
open to permit the removal of the molded articles.
Radio base shells and similar articles may be
molded from powdered plastic material, such as
molding operation.
“Bakelite” One workman can >operate two of
these presses, producing about 22 units of work 30
from each press per hour. By unit AWe mean the
capacity of a set of molds on a press, which may
ly in Figure 1, and lowered after the press
ing operation.
clearly in Figures >1'7 to 20, inclusive.
9. The stripper fork is moved beneath the mold
ed articles when lifted by the name plates,
from the position shown in Figures 17 and
only way to do »this was to decrease the manual
work required per unit of output.
Thek equipment which we use in the per
formance of the operation is'an automatic loader
and unloader and means for cleaning the press 40
tion, comprises generally:
7. The Alower `mold elements are raised to com
press the pellets between the upper and
lower'mold elements, as shown most clear
8. rl’he name plates in the bottoms of the lower
mold elements rise and fall, as shown most
be fifty-two or seventy-five molded parts.
Our problem was to increase the number of
parts that could be -molded by one workman. The
with a minimum amount of labor, whereby one
workman can operate several presses and thus
reduce the man hours per press. The equipment,
involving a preferred embodiment of our inven
ures 6, 12 and 13.
`6. The ‘upper head of the press, carrying the
upper mold elements, swings forward from
'the position shown in Figure 4, to that over
the lower mold elements, as shown most
clearly in Figure 1, and returns after the
18, so that said articles rest thereon, as
shown most clearly in Figures 19 and 20,
when the name plates are lowered.
10. The shells, radio tube bases or other molded
articles, are .blown to the discharge chute
vby‘blasts of air, as represented most clearly
in Figures 4 and 19.
45 11. `The molds are cleaned of “ilash” by blasts of
air, as represented most clearly in Figures
4 and 19.
1. A structural supporting frame work.
`2. A hopper for tablets or pellets of plastic mate
Delivery of pellets from hopper
rial, with means to feed therefrom at one
time a relatively large number, such as seven
Referring to the drawings in detail, like parts
50
ty-ñve, to a press loading board.
being designated by like reference characters,
3. Means for automatically moving the loading
and beginning with the charging of generally
board from beneath the hopper to the mold
spherical tablets or pellets 3l of plastic material,
ing press, discharging the contents of said
such as a phenolic condensation product or “Ba
board into said press, and returning the
kelite,” into the hopper 32, as shown in Figure
k55
board to a position beneath the loading hop
6, we ñnd that these pellets pass down an in
per for recharging.
4. Means for closing the loaded press to mold the
desired articles and then opening it at the
end of a predetermined cycle and raising the
molded articles.
5. Means for discharging the molded articles from
the press.
6. Means for cleaning the molds of excess mate
rial known as “flash”.
clined wall 33 of said hopper on to a feeding
wheel 34„ which is turned by means of a carriage
motor 35 (Fig_ l) through gears (not shown) in
gear box 36, vertical shaft 31, sprocket wheel 24
thereon, drive chain 25, .driven sprocket wheel 25
fixed on shaft 21 (Figs, 7 and 9), driving bevel
gear 38 on said shaft, driven bevel gear 39, and
feeding-wheel carrying-shaft 4 l.
The bevel gear 39 is adapted to drive shaft 4|
7. Control equipment to operate all of the above
through a spring-pressed pawl 42, pivoted to said
in proper sequence upon the mere pressing
gear, and ratchet 43 ñxed on shaft (Fig. 8), so
that if desired the `feeding wheel 34 may be man
of a single starting button.
The cycle-control mechanism employed oper
ates motors, solenoid air valves, and switches at
the proper time to cause the machine to function
properly. Broadly speaking, the functions per
formed -by the disclosed embodiment of our inven
tion are as follows:
ually turned by shaft-carried hand wheel 44 (Fig.
7) independently of the carriage motor 35.
In the bottom of the hopper 32 is an upper
distributor plate 4'5 (Figs. 6, 12 and 13) provided
with apertures 4B therethrough, corresponding in
number and `arrangement with the lower mold
elements 41 (Figs. 4, 15 and 16) of the press 48.
5
2,409,725
Ín order to distribute the pellets 3| uniformly to
the apertures 46 of the distributor plate, we pro
vide mechanism 49 for agitating or stirring said
pellets around on the bottom of the hopper. ’This
mechanism comprises fingers 5| depending from
endless sprocket chains 52, carried by sprocket
tured plate 66, carried by an upper apertured
plate 83, mounted on wheels 84. These' wheels
travel on rails 85 from beneath the hopper 32 to
above the lower mold elements 41 of the press
48.’ The lowerplate 66 is adapted to slide beneath
the upper plate 83, from the position shown in
wheels 53, in turn driven by a sprocket chain 54
Figure 15, so as to release the pellets 3| carried
from a sprocket wheel 55 carried by the drive
by said loading board 56 when the latter reaches
shaft 21 (Figs. 6 and '1). 'I'he sprocket wheels
the position shown in Figure 16. This action is
53 are journalled on bearings 28 carried by hop 10 accomplished by means of bolts 86, -adjustably
per braces 29. The right hand sprocket chain
mounted on the downwardly projecting flange
52, as viewed in Figure 6, is driven by cross chain
81 of an angle iron 88 carried by the plate 66,
230 passing around pinion portions 240 and 210
when the head of said bolt engages the lower mold
of right and left wheels 53.
frame 89, upon movement of the loading board
In order to aline several pellets vertically in 15 56 to its extreme right hand position (Figure 16),
position to be delivered to the press loading board
against the action of the return spring 9| which
56, a lower distributor plate 51 is connected to
norm-ally holds vthe plates 66 and 83 in the posi
the upper distributor plate 45 by means of tubes
tion illustrated in Figure 15. The spring 9| acts
58, one extending from each aperture 46 in the
between a. pin 92 projecting from the upper plate
plate 45 to a corresponding aperture 59 in the 20 83 and a flange 93 of an angular member 90
plate 51.
connected to the angle iron 88.
To provide for feeding the pellets 3| one at a
Transfer of the loading board 56 from beneath
time from each aperture 59, there is provided a
the hopper 32 to above the lower mold elements
valve plate> 6| slidable beneath the plate 51 and
41 is effected by the crank arm 94 (Figures 6 and
provided with a corresponding number of aper
9) on shaft 31 and rotating therewith to cause,
tures 62 positioned so that said plate 6| may re
through connecting rod 91 pivoted to its free end,
ceive a pellet in each aperture and, upon move
the desired reciprocation of `said loading board
ment thereof, transfer said pellets to apertures
by the rod connection with frame members 95
63 in the delivery plate 64 of the hopper 32, and
and 96 extending from opposite sides of said
allow them to drop into corresponding pockets
board.
'
65, in the loading board 56, normally closed by
Swinging of press head
the lower apertured plate 66 of said loading
Upon the pellets 3| being dropped into the lower
board.
mold elements 41, as indicated in Figure 16, the
Inasmuch as the pellets 3| are, in the present
loading board 56 is moved back to recharging
embodiment, of larger diameter than the thick
position, illustrated in Figures 6, 12 and 13, and
ness of the Valve plate 6|, the lower distributor
the upper mold elements 98 of the press 48 are
plate 51 has its apertures 59 formed with lower
moved from their rearward or retracted posi
extensions 61, 'as shown most clearly in Figures
tion, indicated in full lines> in Figure 4, to their
12, 13, and 14, so that upon movement of the
valve plate 6| to the left, from the normal posi 40 forward or operative position indicated in` full
lines in Figure 1, by the following mechanism.
tion shown in Figure 13 4to that shown in Figure
Said upper mold elements 98 are mounted in
12, and then back again, the tops of the pellets
a hollow mold block or plate 80, heated by steam
3|, which drop down on the delivery plate 64,
from pipe |10, and bolted or otherwise secured
pass into said extensions 61, and upon registry
of the apertures 62 and 63, one pellet is dropped 45 to a tilting head 99, which is mounted to swing,
on connecting side plates |00, about trunnions
through each aperture 63 and received in a then
|0| and, at the same time, be tilted with respect
aligned pocket 65 of the loading board 56, as
to said plates on trunnions |26 by means of
shown most clearly in Figure 13.
rods~ |02 (Figures 1, 3, 4 and 5). The upper ends
The valve plate 6| is moved at the'proper
times, for feeding the pellets therethrough, by 50 of said rods |02 are pivoted each to an extension
means of cam wheel 68 ñxed on shaft 31 and on
which travels a roller 69. The cam wheel 68
has a projection 10, which moves the roller-carry
or crank ||0 on a trunnion |20 of the tilting head
99, as indicated at 60, and the lower end of which
is pivoted to a bracket |30, as indicated at |40.
Movement of the side plates |00 is effected by
revolution, to cause corresponding movement of 65 means of an air cylinder | 03, pivoted to a bracket
|05 secured thereon, as indicated at 40. Said
the other arm 13 of said lever against the action
cylinder is carried on a piston |04 and associ
of return spring 14 (Figs. 6 and 9). This move
ing arm 1| of a bell crank lever 12 once each
ment effects a corresponding motion of arm 15
ated rod |01 and is moved from near one end
to near the other of said rod by air pressure.
fixed on shaft 16, through connecting rod 11.
Movement of the shaft 16 effects corresponding 00 Pipe |06 supplies compressed air to the upper
portion of the cylinder |03 to move the same
motion of the arm 18 fixed thereon, which, in
upwardly along the piston rod |01, swinging the
turn, operates a bell crank lever 19, through con
pivoted side plates | 00 from tilted position shown
necting rod 8 I, thereby effecting movement of the
in Figure 4 to upright position shown in Figure 1.
valve plate 6| from the normal position shown
in Figure 13 to that shown in Figure 12, and a 05 A return of the pivoted plates |00 is effected by
compressed air through pipe |08, which acts
prompt spring return to the normal position.
under the piston | 04 and moves the cylinder back
This action transports a set of pellets 3| from
to the position shown in Figure 4.
the position shown. in Figure 12 to that shown
in Figure 13, where they are received in pockets
Operation of lower mold elements
65 in the loading board 56. Inorder to allow 70
When the upper mold elements 98 are posi
for such an operation being performed by hand,
tioned directly over the lower mold elements 41,
the shaft 16 is extended upwardly, as shown
as shown in Figure 1, said lower mold elements
most clearly in VFigure 6, and provided'with a
are raised from the position shown in full lines
hand operable lever 82.l
'
` '
`
to that shown in dotted lines in Figure 4, to shape
" -The loading board 56 consists of a lower aper 76 the pellets of plastic material between the upper
2,409,125
7
and vlower mold elements for a definite period
determined by the timing clock |09 (Figure 23),
While the lower mold elements are heated by
steam introduced into the interior passages |59
of the lower mold block |6| through pipe |62.
8
raised and deposited on, the stripper fork |24, in
the .position shown in Figures 19 and 20, they are
removed `from the >molding; machine along a dis
charge chute |63 to a receptacle |64, by a blast
of air issuing from nozzles on stationary com
pressed air pipe |34. When this has been ef
fected, and ’before the mold is again closed, it is
|65 (Figures 4 and 21), carrying ears `|66 to
cleaned of loose material, such as “ilash,” by
which extend studs |61 from cross members |68
blasts of compressed air from oscillating com
which serve for lowering or returning said ram.
Such `return is effected by pistons |69 carried 10 pressed air pipes |35. These pipes involve angu
larly disposed portions |36 and |31, carrying a
by said cross members and operating in cylinders
plurality of nozzles |38 from which air is dis
|1| carried by the base casting .|12 of the press.
charged directly on the upper and lower mold
The base casting |12 carries the lifting cylin
elements, while said pipes traverse said elements
der |13, for the lower mold elements, in which
from side-to side, or from the position illustrated
is adapted to reciprocate the lifting piston |14,
in full `lines to that `illustrated in dotted lines in
on the upper 4portion |15 of which is mounted
Figure 3. Admitting compressed ail-'to the clean
the ram |65. The lowermost and uppermost posi
ing -pipes |=35 also causes air to actuate piston |3|
tions of the ram are determined by cross frame
in cylinder |32 (Figures 5 and 2l) `to Withdraw
portion `|16 of the base casting |12. Water or
other liquid is admitted to the lifting cylinder 20 the stripper yfork |24, unless positively advanced
by the name plate raising mechanism.
|13 through supply pipe |11 and to the return
The swinging movement of the pipes |35 is ef-cylinders |1| through the supply pipe |18.
fected about the pivot points |39 and |4| by a
When the said time interval has passed, the
blast operating motor |42 which operates a shaft
lower mold elements 41 are dropped again to the
|43, `through reduction gearing contained in box
position shown in full lines in Figure 4, and the
|44, to turn a crank |45 and raise and lower a
name plates 50, forming the lower portions of the
connecting rod |46. The lower end of said rod
lower mold elements 41 are lifted by means of
|46 `is‘pivoted to an arm |41 of a bell crank lever
piston ||| operating a cylinder ||2, to lower the
|48, pivoted in turn at |49 to the air supply pipe
side levers | I3 through piston rod | |4 about pivots
| I5, and thereby actuate the parallel motion lift 30 |5\|, and Yhaving a depending arm |52 respectively
connected-bylinks >| 53 and -| 54 to the portions |36
ing mechanism, consisting of two sets of lifting
ofthe compressed air pipes 4|35 (Fig. 3). In this
links ||6 and ||1 and a connecting member ||8,
way all of the mold elements are cleaned of waste
through links |50 pivoted to extensions |51 of the
material, such as “flash,” by blasts of air, and
levers ||3. The upper ends of the links ||5 are
directly pivoted to the plate 30 to which the name 35 prepared for the reception of a new supply of
moldable material.
plate stems |60 are secured by rods |80 passing
rl‘he ‘mechanism heretofore described is electri
through apertures in their reduced lower end por
cally operated automatically by means of the cir
tions, after being dropped into position, as shown
cuits, `illustrated diagrammatically in Figures 22
in Figures 4, 17 and 19. The securing rods |80
are locked in position, after assembly, by trans 40 and 23, upon pushing button |56, which is used
at `the beginning of each press operation to start
verse rods 2 | 0 passing through outer eye portions
all the mechanism and cause it to function until
thereof, and with their ends, in turn, received in
the end of va cycle. There is also the button |55
slots 220 in the lower mold block IBI,
which is merely `for starting the carriage motor
«As the name plates 50 are lifted upon down
ward movement of the piston |~| |, the roller ||9 45 35 independently of the related press mechanism.
Upon pushing the button |56 all parts-of the
carried at the upper end >of the piston rod ||4
mechanism operate in sequence to perform the
engages cam projection |2| on lever |22 pivoted
various operations outlined, assisted by a cam
to the frame at |23, and thereby moves the
motor |19 and associated mechanism in a box IBI,
stripper fork |24, through a connecting pivoted
link |58, from the position shown in Figures 17, 50 which will now be described.
18, and in full lines .in Figure 4, to that shown
Cam mechanism for press
in Figures 19, 20, and in dotted lines in Figure 4,
The lower mold block |6| is mounted on a ram
so as to underlie the molded articles |25 which
The cam motor V|19 and associated apparatus is
have been lifted by the name plates 50.
In order to insure that the stripper fork is in
outermost position when the side plates |03 are
in vertical positions, a safety lever |26 is pro
illustrated most clearly in Figures l0 and 1l, the
position of the cam box |8| being shown in Fig
vided on a shaft |21, on which is also fixed an
a wheel |84 mounted on a shaft |85 jcurnaled in
ure 1.
The cam motor has a worm |82 on its
armature shaft |83, which worm meshes with
said box |8| and carrying eight cams, |86, |81,
operating levei` |28 connected to the lever |22 by
a pivoted link |29, so that said lever .|22, if not 60 |88, |89, |90, 19|, |92 and |93, formed generally as
shown in Figure 1l, but with the operating pro
already in its outermost position, will be moved
jections |94 definitely disposed and of the desired
to that position when the tilting head v99 is moved
circumferential lengths, rso that the correspond
to a position directly above the lower mold ele
ments 41, by engagement of the adjacent side
plate,` |00 therewith, thereby avoiding the possi
bility of spoiling the molds by effecting an en
gagement therebetween when the stripper fork
|24 is in lifting position. The stripper fork is
normally returned to its outer position by com
65
ingly associated spring contact switches |95, |96,
|91, |98, |99, 200, 20|, 202 are operated at the
desired times,
Each switch is constructed generally as shown
in Figure 11 and desirably comprises an upper or
fixed spring bronze strip 203 carrying a tungsten
pressed air against a piston |3| -movable in a 70 contact204. The cooperating or cam-engageable
element, desirably also comprises a spring bronze
cylinder |32 and acting through its rod on a `bot
tom extension |33 of the safety leverl |20.
Removal of molded articles and mold cleaning
strip 205 carrying a tungsten contact 206. The
respective cams are rotatable clockwise, as índi
cated by the arrow. Each switch may be either
After the molded members |25 have been 75 normally open cr normally closed, and closed or
9.
2,409,725.
opened, as the case may be, upon the cam projec
of pellets 3|, the cam 248 (Fig. 1) on the oper
tion |94 causing engagement, or separating there
from to permit disengagement.
open switch 249, to start the closing operation of
Automatic operating cycle
the loaded molding press. The cam 241 on the
Before the cycle of operations is started,A the
upper and lower mold blocks 80 and I‘6I are
heated by steam, admitted through the pipes |10
and |62, to the proper molding temperature, and
the main switch 2I3 (Fig. 22) is closed, as well as
the knife switch 2I4 and the snap switch 2|5
ating shaft 31 momentarily closes the normally
same shaft, simultaneously or just after starting
the molding press, momentarily opens the nor
mally closed switch elements 233 and 235, to stop
the carriage motor 35 and return its operating
circuits to initial positions.
The closing of switch 249 initiates a circuit
from power line 25| (Fig. 23) through line
252, snap switch 2|5, lines 253, 298 and 254,
switch 249, lines 255, 256 and 251, mercury
(Fig. 23). This energizes the power lines 2 I6, 2I1,
and 2|8, which in the present instance are those
of a three-wire 110-220-Volt alternating-current
switch 258 on one of the side plates |80 of tilting
-system and the 110 volt alternating-current
15 head 99 (which is closed because of the tilted
power lines 25| and 212.
or rearward position of-said head), lines -259, 26|,
The green signal lamp 213 is always energized,
262, 263, and 264, relay coil or solenoid 265 of line
when the knife switch 2I4 is closed, by circuit
starter 266, lines 261, 268 and 269, snap switch
from power line 212 through lines 214 and 215,
2|5, and line 21| to power line 212. The starting
lamp 213, lines 216, 211 and 218, to power line 25|.
This green lamp is, therefore, merely an indica 20 button 250, in parallel with'the switch 249, may
be-used if it is desired to operate the press in
tion that the power is on. Red lamps 219 and 28 I,
dependently of the loading mechanism. The stop
however, are now also energized to show that
button ‘260 is used like the stop switch J of the
the upper mold element or head is in open or
Makenny et al. Patent No. 2,197,528, previously
tilted position. The circuit to these lamps is from
power line 212 through lines 214 and 215, red 25 referred to, to cause the press to open, as in case
of emergency.
lamp 219, lines 282 and 283, mercury switch 284,
Closing of the line starter 266 initiates a circuit
which is in the closed position shown in full lines,
from power line 212 through lines 214 and 289,
when the head 99 is tilted as shown in Figure 4,
solenoid 29| of timing clock |09, toreset the
lines 285 and 253, snap switch 2|5, and line 252,
to power line 25|. The red lamp 28| operates in 30 clock for a predetermined timing period, as by
releasing and allowing its pointer or hand 292 to
parallel with the red lamp 219, from line 283
move,- as by spring pressure, from the zero posi
through line 286 and from power line 212 through
tion shown in full lines to the set position shown
line 21|, snap switch 2|5, and lines 269 and 281.
'I'he automatic operating cycle starts when the . in dotted lines, thereby preparing it to time the
molding operation. The circuit continues from
push button |56 (Fig. 22) is depressed or closed,
solenoid 29| through lines 293, 294, 295, 296 and
at which time it is assumed that the press is open
v291, through the left hand contact of line starter
as shown in Figure 4, and that the loading board
266,‘1ines` 298, 253, snap switch 2|5, and line 252
56 underlies the hopper 32 and contains a charge
to Apower >line 25|.
’
of moldable pellets 3|'.
Simultaneously with this resetting action, the
Depressing the button |56 closes a circuit from 40
head or upper mold element 99 starts to move
power line 2I6 through conductors or lines 2I9,
forward from the position shown in Figure 4, on
22| and 222, switch |56, lines 223, 224, _and 225,
the-admission of air from compressed air supply
relay coil or solenoid 226 (to close line starter
line 290 to the pipe |06 by energization of the
221), and lines 228 and 229 to power line 2I8.
solenoid 299 moving the air valve operating han
Closing the line starter 221, initiates a circuit,
dle »30| to the right from the position shown in
independent of the opening of the switch |56,
Figure 23. The operating circuit for effecting this
from power line 2|6 through lines 2I9, 22|, and
movement is from power line 25|,` through linev
23| , left hand Contact of line starter 221, line 232,
252, snap switch 2|5, lines 253 and '298, right
normally closed cam-operated switch member
233, lines 224 and 225, solenoid 226, and lines 228 50 hand contact of line starter 266, lines 302 and
303, solenoid 299, lines 304, 305, 306 and 269, snap
and 229 to power line 2 I8. This, of course, means
switch 2|5, line 21| to power line 212.
that only instantaneous closing of the switch |56
When the head 99 has been moved to the verti
is necessary in order to initiate the cycle of
cal position, or directly above the lower mold
operations.
Closing of the line starter 221 also initiates a 55 elements 41, the red lamps 219 and 28| are de
energized,l the lower mold elements start to rise,
circuit from power line 2|6 through lines 2 I9, 22|
and the clock simultaneously starts timing the
and 234, normally closed cam-operated switch
molding operation. The clock timingperiod is
element 235, line 236, normally closed stop but
so adjusted that it makes allowance for the time
ton or switch 231, lines 238 and 239, right hand
contact of line starter 221, line 24 I, cam-operated 60 the mold elements 41 take to actually rise into
engagement with the. head 99 or mold elements
switch 202 (closed only at the beginning of the
therein, so that the moldable material is kept
cycle) , lines 242 and 243, and relay coil or solenoid
pressed, subject to the steam heating operation,
244 of line starter 245 (for carriage motor 35) to
for a predetermined ldesirable length of time.
power line 2|1. The inclusion of the switch 202
The circuits for effecting these operations are
in the circuit »insures a correct initial positioning 65
of the cam shaft |85, as otherwise the carriage
from power line 25|, through line 252, snap
motor will not start. Closing of the line starter
switch 2|5, lines 253 and 285, to switch 301
245 not only starts the carriage motor 35, but
(closed momentarily by the clockwise tilting vof
causes closing of the hold-in switch 246 which
the switch lever 308, pivoted to stationary sup
short-circuits the line through switch 202. The 70 porting frame 309 as indicated at 3I0) , line 3`I5,
press is now loaded and the loading board 56
mercury switch-3I6 (which closes as the upper
returns for refilling.
mold element reaches its forward position), lines
After the return of the loading board 56 to
311 and'3l8, solenoid 3I9, lines 32|, 305, 306 and
position beneath the loading hopper 32, and the
269, snap switch 2|5, and line -21| to power line
-‘charging of said loading board with a new batch 75
212.
i
.
„
.
.1
_
j
2,409,725
11
The lever 308 is tilted, to the dotted position
shown in Figure 23, by the engagement of arm
3| I therewith (which arm is carried by crank ||0
on one of the trunnions |20), as the head 99
reaches the forward or vertical' position, as shown
in Figure l. The tilting of said lever 308 to the
dotted position also opens mercury switch 284
(de-energizing the red lamps ‘219 and 28|) and
closes mercury switch '325, both carried thereby.
12
341 on the base of the machine is momentarily
tripped or moved to the horizontal closing posi
tion, shown in Figure 3, by the actuating mem
ber 348 carried by one of the cross members |68.
The member 348 has a pivoted tip portion 349
which engages the left end 350 of the switch
carrier pivoted at 360 and actually moves the
switch 341. The tip portion 349 swings down
wardly out of the way upon the upward return
The lever 308 carries a tip member 3|2 pivoted 10 movement of the lower mold elements, so that
the Switch 341 is only closed once upon each mo
at 3|3, so that it causes closure of the switch 301
tion cycle of'said lower elements.
only when swinging clockwise, or moving from
Closing of the switch 341 completes a circuit
right to left, as viewed in Figure 23. The tip
from. power line 212 through line 21|, snap switch
member 3|2 swings clockwise or to the left (so
`2|5, lines 269, 306 and 305, solenoid 35|, lines 352,
as to be out of the way without performing any
353, 354 and 355, mercury switch 341, lines 356,
function), when the lever 308 moves back from
344, 345, 298 and 253, snap switch 2|5, and line
dotted to full line position. The arm 3| | actuates
252 to power line 25|. Energization of the sole
the lever 308 by engagement with a crank arm
noid 35| returns the air valve operating handle
3|4 extending from the latter.
30| to the initial position illustrated in Figure 23,
Energization of the solenoid 3 | 9 pulls the water
admitting air to pipe line |98 from supply line 290,
valve operating handle 322 to the right, as viewed
and exhausting it from pipe line |06, to move the
in Figure 23, to cause water to flow from supply
head, 99, including the upper mold elements 98, to
line 323 through the valve and line |11 to the cyl
initial tilted position as shown in Figure 4.
inder |13 (Fig. 21) under the piston |14l to lift
As the head returns to said tilted position, the
the lower mold elements 41 into engagement with 25
red lamps 219 and 28| are re-energized by the
the upper mold or head 99, closing the mold
release of the crank arm 3|4 allowing the mer
against the lesser force of water pressure on the
cury switch- 284 to close. At the same time the
pistons |69 in cylinders |1|, supplied through
lever 351', carried on one of the side plates |00
branch pipe |18, which in this case act as
swings back (toward the right hand position illus
cushioning means.
trated in Figures 5 and 23) and engages the arm
Timing movement of the clock is effected by
358 of bell crank lever 359 pivoted at 36| on a
energization of the clock motor 321 from power
base portion of the machine, and tilts the mer
line 212 through line 21|, snap switch ‘2|5, line
cury switch 362 carried on a depending arm 363
324», mercury switch 325 (now closed by the carry
thereof to closed position, against the action of
ing lever 308 being in its dotted position), line
return spring 364, thereby energizing the relay
326, clock motor 321, and lines 328 and 218 to
coil or solenoid 365 of line starter 356 for the
power line 25|.
control or cam motor |19 (Fig. 22).
When the timing pointer 292 reaches its initial
Energization of this actuating solenoid is ef
or zero position, shown in full lines in Figure 23,
at the end of' the predetermined timing period, 40 fected from power line 2l6, through lines 2|9
and 361, mercury switch 362 (Fig. 23), line 368
it closes a circuit through contact 334 which
(Fig. 22), lines 309 and 31|, normally closed
energizes the counter 33| and adds one to the
switch 312 in time delay relay 313‘, line 314, relay
number recorded thereon. The circuit for this
coil’ or solenoid 365 of line starter 366, and lines
purpose is from power line 212 through line 21|,
snap switch 2|5, line 324, mercury switch 325, 45 315 and 229 to power line 2|8. Ac'tuation of the
solenoidy 365 closes the line starter contacts and
lines 326' and 332, counter 33|, line 333, pointer
energizes the relay coil or solenoid 311 in the time
292, contact 334, and lines 328’ and 218 to power
delay relay 313 to cause a closure of the switch
line 25|, This counter records the fact that a
318 therein at the end of the predetermined time
load of pressed members |25 has been finished in
50 interval, and then the opening of the switch 312.
the machine.
A holding circuit for the line -starter solenoid
At the same time that the counter is energized
365 is established (so that opening of the mercury
the lower mold element is started on its return
switch 362 does not open line starter 366) from
travel to initial position by energization of the
power line 2l6, through lines 2 I9, 361, 319, middle
solenoid 335 to return the water valve operating
handle 322 to initial position, thereby exhausting 55 contact of starter 366, lines 368, 369, 31|, switch
312, line 314, solenoid 365, and lines 315 and 229
the 'water from the cylinder |13 through pipe |11
to power line 2 IS. The circuit for energizing the
to pipe 346, while still maintaining the water
solenoid 311 is from power line 2l6 through lines
pressure in cylinders |1|. The energization of
2|9, 361 and 319, left contact of line starter 366,
the solenoid 335 is effected only after the circuit
through clock pointer 292 is completed to ener 60 lines 38| and 362, time delay` solenoid 311, lines
383 and 384, right contact of line starter 366,
gize the relay coil or solenoid 336 of’line starter
and lines 315 and 229 to power line 2 | 8.
340. The circuit for effecting this energization
Closing of the time delay relay switch 318, at
is from power line 212 through line 21|, snap
the end of the predetermined interval, energizes
switch 2|5, lines 269 and 306, solenoid 336, lines
331, 338, 339 and 333‘, pointer 292, contact 334, and 65 control or cam motor |19 from power line 2l6
through lines 2|9, 22| and 385, switch 318, line
lines328'and 218 to power line 25|. Closing of the
386, motor |19, and line 229 to power line 2|8.
line starter 340, completes the circuit from power
Turning of the shaft |85 (Figs. 10 and 11) by
line 212l through line 21|, snap switch 2|5, line
the motor |19 first causes closing of switch |95
324, mercury switch 325, lines 326, 34| and 342,
solenoid 335, line 343, line starter 340, lines 344, 70 by means of cam |96, thereby establishing a
holding motor circuit from power line 2l6 (Fig.
345, 298 and 253, snap switch 2|5, and line 252 to
22) through lines 2|9, 361, 381
388, switch
power line 25|.
|95, line 389, motor
and line 229 to power
When the piston |14 reaches its lowermost posi
line 2|8. This keeps the motor |19 running even
tion, under the action of the return pistons |69
operating in cylinders |1|, the mercury switch 75 after'opening of theA switch 312, which opens the
2,409,725v
14
starter 366, causing opening of the switch 318 and
breaking the motor starting circuit, upon a return
of the time delay relay to initial position. The
the tine particles of “flash” and the like and a.
withdrawal of the stripper fork |24.
cam |86 is so formed that it keeps the switch |95
closed and the motor |19 running until all the
other cams of the series on the shaft | 85 have
performed their functions in a manner which will
now be explained.
Further turning of the shaft |85 causes clos
Closing of the switch |98 effects raising of the
Further movement of the shaft |85 causes
closure of the switch |98 by the respective cam
|89, while still keeping the switch 200 closed.
name plates 50 once more (and inward movement
of the stripper fork |24 against the air pressure
in cylinder |32), in exactly the same manner as
ing of the switch |96 by its cam |81, thereby ef 10 closing of the switch |96 previously described, eX
fecting energization of the solenoid 39| to move
cept that the circuit is through switch |98 with
the air valve handle 392, from the position shown
the line 394 not used.
in Figure 22, to admit compressed air from the
Further turning of the shaft | 85 opens the
line 290 to the cylinder || 2 (Fig. 21) above the
switch |98 and effects closure of the switch |99
piston ||| through pipe 393, and raise the name
by means of its cam |90. This re-energizes the
plates 50, lifting the molded members |25 from(
solenoid 40| and again lowers the name plates,
the lower mold elements 41 to the position shown
in a manner exactly as previously described in
in Figures 1'7 and 18.
connection with the closing of the switch |91, ex
The circuit for effecting this operation is from
cept that the circuit is now through the addi
power line 2|6, through lines 2|9, 361, 381, 388, 20 tio-nal line 4|2. The stripper fork |24 is with
switch | 96, lines 394 and 395, solenoid 39|, and
drawn by the action of compressed air in its
lines 3'96, 391, 228 and 229 to power line 2|8. As
cylinder |32. The switches 260 and »20| then open
previously explained, a, raising of the name plates
allowing the air valve handles 405 and 4|| to be
also effects movement of the stripper fork |24 to
closed by their return springs 4|8 and 4|9. Fin
a position beneath the molded articles |25; that 25 ally the switch 202 is closed by actionA of its
is, from the position shown in Figures 17 and 18
cam |93, and the switch |95 is opened stopping
to that shown in Figures 19 and 20.
the cam motor and putting the mechanism in
Further turning of the shaft |85 opens the
position to be again started for a new cycle of
switch |96 and closes the switch |91 by cam |88,
operations by merely pushing the button |56.
thereby exhausting air from the pipe 393 and ad 30
If for any reason it is desired to open the mold
mitting it to the pipe 399 to lower the name plates
prior to the end of the normal molding opera
50, leaving the stripper fork advanced and sup
tion, the stop button 260 is depressed, initiating
porting the molded articles |25, by energizing the
a circuit from power line 212'through line 21|,
solenoid 40| to return the air valve handle 392 to
snap switch 2|5, line 324, mercury switch 325,
the position shown in Figure 22. The circuit for
lines 326, 34|, 342, solenoid 345, lines 4|5, 4|B
accomplishing this is from power line 2 | 6 through
and 4|1, stop switch 260, lines 298 and 233, snap
lines 2|9, 361, 381, 388, switch |91, lines 402`
switch 2|5, and line 252 to power line 25|. This
and 403, solenoid 40|, lines 396, 391, 228 and 229,
energization of the solenoid, starts the cycle of
to power line 2|8. When this is accomplished,
operations, beginning with the lowering of the
the molded articles rest on the stripper fork as 40 bottom mold elements, which results in an au
shown in Figures 19 and 20.
tomatic complete opening of the press, in accord
Further movement of the shaft |05 effects clo
ance with the previous description.
sure of the switch 200 by its cam |9|, thereby
Outline of operations with reference to Figure 2
energizing the solenoid 404 to turn air valve
handle 405 and admit compressed air to station 45
In order to start the automatic molding cycle,
ary blower pipe |34, before the name plates have
(assuming the press is open and the loading board
reached their lowest position, to move the shells,
56 is under the loading hopper 32 and contains a
or other molded articles |25, to and along the
load of pellets 3|), steam is admitted to the upper
discharge chute |63 and on into the receptacle
and lower mold blocks 80 and |6| through the
|64. The actuating circuit is from power line 60 pipes |10 and |62 to heat them to the desired
2|6, through lines 2|9, 361, 381, 388, switch 200,
lines 4|0 and 4|3, solenoid 404, and lines 391, 228
and 229, to power line 2|8.
In order to insure that all particles, as well as
the actual molded articles, are removed from the
molding temperature, and the switches 2|3, 2|4
and 2|5 are closed, energizing thegreen lamp
213' and the red lamps 219 and 28|. The green
lamp indicates that the power is on and the red
lamps (which may be positioned at desired loca
v
molds by compressed air, the swing motor |42 55 tions), that the press is open.
The starting switch or button |56 may now be
is energized, upon closing of the switch 20|, and
depressed, closing the line starter 221 to initiate
compressed air admitted to the swinging blower
a circuit shunting the starting button line cir
pipes |35 and the stripper fork is retracted. The
name plates are then again raised while the air 60 cuit, and making it unnecessary for operation to
,
continues to blow from the stationary blower pipe . keep the starting button depressed.
|34.
'
The line starter 245 then closes, as well as the
associated switch 246, which starts the carriage
motor 315, and maintains the operation thereof
from power line 2|6 through lines 2|9, 361, 381,
forv the required period of time.
switch 20|, lines 406 and 4|4, swing motor |42, 65 This situation is represented in Figure 2 by the
Energization of the swing motor |42 is elTected
and lines 391, 228 and 229 to power line 2|8. At
the same time energization of the solenoid 408
upper line, or that after "pellet carriage,” show
ing _that said carriage iirst moves in -to load the
is effected, in parallel with the swing motor
mold and then out after the mold has been
|42, through lines 409 and 399 from lines 4 I4 and
charged, as indicated by the second line, or that
70
391, respectively, to move the air valve handle
afterv “mold charging.” After return, a new
4|| and admit compressed air through pipe |5|
batch of pellets is placed in the carriage, as shown
to swinging pipes |35 and cylinder |32 (Figs. 3,
by the third line, or that marked "charging new
>21 and 22). This effects a thorough cleaning of
batchof pellets into carriage.”
the then opened mold elements by removing all
AAfter the press has been loaded and the board
2,409,725
15
56 returned for recharging, switch 249 is momen
tarily closed by the cam 248 to close the line
starter 266 for operation of the press 48, and the
switches 233 and 235 momentarily opened to stop
the carriage motor and return the operating cir
cuits therefor to initial positions.
Closing of the line starter 266, effects resetting
of the timing clock |09 to fix the duration of
the molding operation, and starts the forward
swinging movement of the head and upper mold
elements. When the head reaches a vertical po
sition, or one directly above the lower mold elements, the red lamps 219 and 28| are put out
to indicate that said head has moved forward..
This operation is indicated on the fourth line of
Figure 2, or that after “tilting head” showing
that it moves forward before the bottom mold
elements move up, which latter operation now
starts as indicated on the fifth line, or that after
20
“bottom mold.”
As the bottom mold elements rise to close the
mold, the clock |09 starts the timing operation.
This means that the mold is held closed, in the
absence of an emergency use of the stop button
260, until the moldable material has been com
pressed in the steam heated mold for the desired
length of time.
At the end of `the timing cycle, a circuit is
initiated by the clock |09, through its contact
334, which energizes the counter 33|, and the
lower mold element, then moves to open position
or down, as indicated on said fifth line of Figure 2,
followed by a backward or tilting movement of
the head, as indicated on the fourth line of said
figure.
16
allowing the stripper fork to be withdrawn by
compressed air in the cylinder |32.
The switches 209 and 20| then open allowing
the air to be shut off, the switch 202 closes, and
the switch |95 opens stopping the cam, motor and
returning the mechanism to initial position, ready
for restarting by button |56.
Summarizing the foregoing operations, we have
the following sequence:
l. Admit steam to upper and lower mold blocks
80 and |6| and open hydraulic and air line
valves.
M . Close switches 2|3, 2|4 and 2|5 to energize
green and red lamps and apply power to
operating lines.
.Push starting button |56.
Line starter 221 closes.
campo:
. Starting button circuit shunted.
. Line starter 245 and associated switch 246
closes, starting carriage motor 35 to cause
the press to be loaded with preferably gen
erally spherical pellets of moldable mate
rial and the loading‘board returned forre-
charging.
7. Switch 249 momentarily closed to operate line
starter 266 for the press 48.
8. Switches 233 and 235 momentarily opened to
stop carriage motor 35.
9. Timing clock |09 reset.
10. Upper mold elements move forward.
l1. Red lamps de-energized.
12. Lower mold elements move up.
. Clock |09 starts the timing operation.
14. Moldable material compressed for the desired
length of’time.
l5. Counter energized.
1G. Lower mold elements move down.
17. Head tilts backward to open position.
13. Red. lamps ree-energized.
closing of the switch 362 results to operate the
line starter 366 for the time delay relay 313. 40 19. Cam motor |19 started through time-delay
As the tilting head or upper mold elements
move to open or rearward position, the red lamps
219 and 28| are re-energized and a momentary
This time-delay relay effects operation of the
relay.
20. Switch |95 closes to provide motor holding
cam motor |19, beginning at about the end of
circuit.
the rearward movementl of the tilting head, as
l. Name plates rise and stripper fork moves in.
shown on the sixth line of Figure 2, or that after
, Name plates descend leaving stripper fork
“cam motor.”
under molded articles.
Operation of the cam motor |19 causes closing
. Molded articles blown from supporting strip
of the switch |95 to provide a holding circuit to
per fork.
keep it going. Further movement of the motor
s . Mold elements cleaned of “flash” by comcloses switch |96 to cause the name plates 50 to
pressed air.
rise, as indicated on the seventh line of Figure 2, to
. Stripper fork retracted.
or after “name plate,” and the stripper fork to
. Name plates raised and stripper fork again
move in, as indicated on the eighth line of Fig
advanced, this time against air pressure,
ure 2, or after "stripper fork.”
and with air blowing against these parts
Further movement of the cam motor causes
to remove the “flash”
closing of the switch |91v which starts lowering 55
. Name plates lowered and stripper fork with
the name plates, leaving the stripper fork under
drawn.
the molded articles, and then closing of the switch
. Blower air shut off.
200 to start blowing the shells from the supporting
. Switch 202 closes to put circuits in condition
stripper fork, as indicated on the ninth line ol'
for restarting.
Fig. 2, or after “removal of shells.”
60
. Switch |95 opens stopping cam motor and
Upon further movement, the cam motor causes
returning mechanism to initial position.
closing< of the switch 20| and “flash” cleaning,
In view of the foregoing, it will be seen that
as indicated on the tenth line of Fig. 2, or after
we have provided mechanism for taking pellets
“flash cleaning,” by energization of :the swing
motor |42 and admitting air to the swinging 65 of moldable materia-l from a hopper, feeding them
to a molding machine, and automatically remov
blower pipes |35 and cylinder |32 to retract the
ing them from said machine when finished, with-~
stripper fork.
out any intermediate handling or attention on
The next operation is the closure of the switch
the part of the operator.
|98 (without opening the switch 200), to raise
the name plates 50 once more and move the
It will also be seen that we have provided inter
stripper fork inward again (this time against the
locks for preventing the mold from closing when
pressure of air in cylinder |32).
damage might ensue if such an operation oc
` Further movement of the cam motor causes
curred, signal lights for showing when the power
opening of the switch |98 and closing of the
is on and when the mold is open, as well as means
switch |99, again lowering the name plates and 75 for operating the feeding mechanism independ
2,409,725
l7
ently of the molding mechanism, and the molding
mechanism independently of the feeding mecha
msm.
Itv will be understood that although our inven
tion is shown embodied in a Certain type of press,
yet the loader will also work with vertically open
ing presses, as well as tilting head presses. The
,
18
said lower mold frame so that it is capable of
being moved up to and down from the upper
mold elements when in their forward position,
electrical mechanism for automatically control
ling said apparatus, manually operable means for
energizing said electrical mechanism to start au
` tomatic operation of the apparatus, mechanism
loader, although shown separate from the mold
operable under the control of said electrical mech
ing press itself, may, if desired, he consolidated1
anism
for delivering plastic pellets simultaneously
therewith. If separate, however, immediate re 10
to
all
of said lower mold elements, means for
moval thereof is permitted for the purpose of
swinging the upper mold elements forward over
manually operating the press, if at any time
the lower mold elements and after a predeter
desired.
mined
time period returning them to normal posi
If itis desired to cause the press to work entirely
tion, means for moving the lower mold elements
automatically, that is, continue in production
up to compress said pellets against the upper mold
with one cycle immediately following a prior
elements when the latter` are inA forward posi
cycle, after once being started and without atten
tion and after a predetermined time interval mov
tion from the operator, this may be accomplished
ing down to normal position, means in each of
by causing the starting button |56 to stay de
pressed, or permanently connect the lines 222 20 said lower mold elements which engages the lower
surface of each article, means to raise said ar
and 223, as shown in Figure 22.
ticle-engaging means, lift all of said articles, and
If desired the tablet hopper may be wired or
then lower said means, article-supporting means,
otherwise provided with means to preheat the
means to move said supporting means under all
pellets and thus speed up the curing cycle. It
of said lifted articles to support the same after
may be served from a belt or other conveyor to
the article-engaging means descend to normal
keep it filled with pellets and thus eliminate the
position, and means for delivering a blast of air
necessity for manual loading thereof. It will also
to remove said articles from said supporting
be understood that the mold blocks may be heated
by other means than steam, such as electricity
means.
for example.
~
The molded members or shells are, as described,
y
.
3. Apparatus for automatically molding plastic
30 material comprising an upper mold block and a
lower mold frame, a plurality of upper mold ele
ments
in said block, and a corresponding num
chute, such as 163, into a receptacle, such as ieri,
ber of lower mold elements in said frame, means
thereby delivering them where desired and pre
mounting said upper mold block so that it is oa
venting them from getting on the floor.
35 pable of being swung forwardly over and rear
Although we have shown pellets or tablets for
blown off the mold, after stripping, through a
feeding the molds, it will be understood that, if
desired, the moldable material may be fed thereto
in powdered form.
wardly from the lower mold elements, means
mounting said lower mold frame so that it is ca
pable of being moved up to and down from the
upper
mold elements when in their forward posi
Although a preferred embodiment of our in 40
tion, electrical mechanism for automatically con
vention has been disclosed, it will be understood
trolling said apparatus, manually operable means
that modifications may be made Within the spirit
for energizing said electrical mechanism to start
and scope of the appended claims.
automatic operation of the apparatus, mechanism
We claim:
operable under the control of said electrical mech
l. Apparatus for molding plastic material comi 45 anism for delivering plastic pellets simultane
prising a hopper for distributing pellets thereof,
ously to all of said lower mold elements, means
a loading carriage comprising upper and lower
for swinging the upper mold elements forward
plates, said upper plate having a plurality of aper
over the lower mold elements and after a pre
tures to receive said pellets, said lower plate being
determined time period returning them to nor
similarly apertured, so that in one relative posi 50 mal position, a, clock to time said period, means
tion it supports and in another it releases pellets
for moving the lower mold elements up to com
in said upper plate apertures, means in said
press said pellets against the upper mold elements
hopper for automatically delivering pellets simul
when the latter are in forward position, and after
taneously to all apertures of the upper plate
said time period down to normal position, a name
when the lower plate is in supporting position,
plate in each of said lower mold elements which
a molding press formed with upper and lower mold
engages »the lower surface of each article after
elements, corresponding in number and arrange~
molding, means to raise said name plates, lift all
ment with the pellet-holding apertures of said
of said articles, and then lower said plates, strip
upper plate, means vfor automatically moving said
per forks, means to move Said forks under all of
carriage from beneath said hopper to above said
said lifted articles to support the same after the
lower mold elements and depositing said pellets
name plates descend to normal position, means
simultaneously in all of said elements, means to
fordelivering
a blast of air to remove said ar
bring the mold elements together to compress said
ticles from said stripper forks, and means to de
pellets and then separate said elements after a
liver another blast of air to clean the mold ele
predetermined time interval, and means to auto
‘ ments and put them in condition for receiving
matically remove’the molded articles from said
another charge of pellets.
lower mold elements.
2. Apparatus for automatically molding plastic
material comprising an upper mold block and a
lower mold frame, a plurality of upper mold ele
ments in said block, a corresponding number of
1lower mold elements in said frame, means mount
ing said upper mold block so that it is capable i
4. Apparatus for automatically molding plastic
material comprising an upper mold block and a
lower mold frame, a plurality of upper mold ele
ments in said block, a corresponding number of
lower mold elements in said frame, means mount
ing said upper mold block so that it is capable of
being moved between open and molding posi
of being swung forwardly over and rearwardly
electrical mechanism for automatically con
from the lower mold elements, means mounting 75 tions,
trolling said apparatus, manually operable means
2,409,725
19
for energizing said electrical mechanism to start
automatic operation of the apparatus, mechanism
operable under the control of said electrical
mechanism for delivering plastic pellets simulta
20
engaged means after the material has been mold
ed, lift all of the formed articles, and then lower
said means, article-supporting means, means to
move said supporting means under all of said
neously to all of said lower mold elements, means Ul lifted articles to hold the same after the article
engaged means descend to normal position, and
for moving the upper mold elements to molding
means for delivering a blast of air to remove
position and after a predetermined time period
said articles from said supporting means.
returning them to open position, means in each
’7. Apparatus for molding plastic material com
of said lower mold elements which engage the
prising a, hopper, means in said. hopper for ar
lower surface of articles being molded, means to
ranging a plurality of pellets for simultaneous
raise said article-engaging means, lift all of said
discharge therefrom, a loading board with a plu
articles, and then lower said means, article-sup
porting means, means to move said supporting
means under all of said lifted articles to support
rality of pellet-»holding portions corresponding in
number pellets,
hopper
and arrangement
means for operating
with said
said hopper
the same after the article-engaging means 15
to automatically deliver all of said arranged pel
descend to normal position, and means for de
lets so that one lies in each holding portion ol
livering a blast of air to remove said articles from
said board, a molding press formed with upper
said supporting means.
and lower mold elements, correspond?
in num
5. Apparatus for automatically molding plastic
ber and arrangement with the pellet-holding por
material comprising an upper mold block and a 20
tions of said board, means in each of said lower
lower mold frame, a plurality of upper mold ele
mold elements which are engaged by the lower
ments in said block, and a corresponding number
surfaces oi the articles being formed, means for
of lower mold elements in said frame, means
automatically moving said board from beneath
said hopper to above said lower mold elements
capable of being moved between open and mold
and depositing said pellets simultaneously in all
ing positions, electrical mechanism for automati
of said lower mold elements, means to bring the
cally controlling said apparatus, manually oper
mold elements together to compress said pellets
able means for energizing said electrical mecha
and then separate said elements after a pre
nism to start automatic operation of the appara
determined time interval, means to raise said
30
tus, mechanism operable under the control of said
article-engaged means to lift all oi the formed
electrical mechanism for delivering plastic pellets
articles, and then lower said means, article-sup
simultaneously to all oi said lower mold elements,
mounting said upper mold block so that it is
means for moving the upper mold elements to
porting means, means to move said supporting
means under all of said lifted articles to hold the
molding position and after a predetermined time
same after the article-engaged means descend to
35
period returning them to open position, a clock
normal position, and means `for delivering a blast
to time said period, means in each oi said lower
of air to remove said articles from said supporting
mold elements which engage the lower surfaces
means.
of articles being molded, means to raise said
8. Apparatus for molding plastic material coin
article-engaging means, lift all of said articles,
prising a hopper for distributing pellets thereof,
and then lower said means, stripper i‘orlis, means
a loading carriage comprising upper and lower
to move said forks under all or said lifted articles
plates, said upper plate having a plurality of
to support the saine after the article-engaging
apertures to receive said pellets, said lower plate
means descend to normal position, means for de
being similarly apertured, so that in one relative
livering a blast of air to remove said articles from
position it supports and in another it releases
said stripper forks, and means to deliver another
pellets in said upper plate apertures, means for
blast of air to clean the mold elements and put
operating said hopper to automatically deliver'
them in condition for receiving another charge
pellets simultaneously in all apertures of the
of pellets.
upper plate when the lower plate is in supporting
6. Apparatus for molding plastic material com
position, a molding press formed with upper and
prising a molding press having an upper mold '
lower mold elements corresponding in number
block and a lower mold frame, a plurality of
and arrangement with the pellet-holding aper
upper mold elements in said frame, means in
tures of said upper plate, means in each of said
each of said lower mold elements which are en»
gaged by the lower surfaces of the articles being i lower mold elements which are engaged by the
articles being formed` means for automatically
molded, means for opening and closing said press,
moving said carriage from beneath said hopper
a carriage comprising upper and lower plates,
to above said lower mold elements and deposit
said upper plate being apertured to receive said
ing said pellets simultaneously in all of said lower
material, said lower plate being similarly aper
mold elements, means to bring said mold ele
tured so that in one position relative to said upper
plate it supports, and in another position it re (it ments together to compress said pellets and then
separate Said elements after a predetermined
leases, material in said upper plate apertures,
time interval, means to automatically li'it said
means for loading said carriage with said ma
molded articles from said lower mold elements
terial when said plates are in supporting rola
by raising said article-engaged means, means to
tion, means for moving said carriage from be
neath said loading means to above the lower mold fr: f then lower said means, article-supporting means,
means to move said supporting means under all
elements, electrical operating and control means
of said lifted articles to hold the same after the
for said press and carriage for loading said car,
article-engaged means descend to normal posi~
riage with said material, moving it from beneath
tion, and means for delivering a blast of air to
said loading means to above the lower mold ele
remove said articles from said supporting means.
ments, adjusting the carriage to the release posi
JAMES B. WHITMORE.
tion of its plates to deposit its load simultaneously
WILLIAM MAKENNY.
in all of said lower mold elements, and moving it
FRANK A. NEWCOMBE.
back for reloading, means to raise said article
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