close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3068521

код для вставки
Dec- 18, 1962
-
J. c. VAN HOUTEN
MOULDING PRESSES
Filed Nov- 6. 1959
3,068,512
'
3 Sheets-Sheet l
FIGJ
VENTOR
J.
VAN HOUTEN
AGENT
Dec. ,18, 1962
3,068,512
J. C. VAN HOUTEN
MOULDING PRESSES
Filed Nov. 6.‘ 1959
3 Sheets-Sheet 2 '
INVENTOR
J. C. VAN HOUTEN
BY
-
AGglT 2
_
Dec. 18, 1962
J. c. VAN HOUTEN
3,068,512
MOULDING PRESSES
Filed NOV. 6, 1959
3 Sheets-Sheet 3
“6.8
INVENTOR
J. c. VAN HOUTEN
~ Stats atent
,.
ice
3,068,512.
lian Chrisio?el Van Houten, Baarn, Netherlands, assignor
to North American Philips Company Inc, New York,
N.Y., a corporation of Delaware
Fit-ed Nov. 6, 1%9, Ser. No. 851,358
Claims priority, application Netherlands Nov. 26, 1958
_
5 Claims. (Cl. 18—5.3)
Patented Dec. 18, 1%62
2
1
MGULDING PRESSES
3,668,512
can be effected, for example, through a lever mechanism,
by the upper part being raised to open the die.
However, it is simpler, if, according to another embodi
ment of the invention, the raised upper part of the die
bears against a switch which controls the movements of
the electric heater elements both in time and in direction.
According to an embodiment of the invention, pref
erably the upper part of the die is held in the open posi
tion during the preheating treatment by mechanical or
This invention relates to a press for moulding articles, 10 electromagnetical means.
After the die has been cooled ‘and again placed on the
lifting table or transport device, it can be opened manually.
in one embodiment of the invention, however, preferably
means are provided to open the die, at least partly, in
which are hinged to one another and to which the stampers 15 one of its positions. According to a further embodiment
are secured. One of the plates has a centering stud while
of the invention, however, in this event preferably at least
the other plate has a centering aperture cooperating with
a portion of the upper part is made greater, in a direction
this stud. Such a die has large advantages. Since the
parallel to the axis of the hinge, than the lower part,
die is readily transportable, separate hot and cold press
while the transport device is provided, for one position of
blocks can be used, so that the press need not be changed
the die, with guiding- members which embrace the sides
over and this is highly advantageous from the point of
or" the lower part of the die and are open at least at the
view of thermal economy. in addition, the operation of
side of the press. Thus, when the die is opened, its lower
the press requires less physical strength, since the heavy
part is held; a transport device is required. According to
pressing blocks are stationary.
an embodiment of the invention, the operation of open
The present invention relates to a moulding press using 25 ing the die can be effected in that the transport device is
provided with two substantially vertical partitions, which
book-type dies and is characterized in that the press has
a lifting table comprising three adjacent positions for the
are bevelled at the side of the press and are arranged one
dies, the central position corresponding to the location of
on each side of the guiding grooves, the greatest height
of these partitions being at least equal to the spacing be
the pressing blocks, while the two other positions lie each
on one side of the central position, the lifting taole being 30 tween the inner side‘ of the upper part of the die and the
capable of performing a vertical movement, which pref
upper surface of the transport device when the die is
erably is controlled electrically and produced hydraulical
opened to an extent such that the centering stud is dis
ly, by which movement the dies disposed on the lifting
engaged from the upper Stamper, while the bevelled por
table can be brought to the level of the hot or cold pressing
tion has a minimum height which at most is equal to the
block, while furthermore means are provided which per
spacing between the upper and the lower parts of the
such ‘as disc-shaped phonograph records, from thermo
plastic and thermosetting material.
In moulding gramophone records, it is known to use
dies shaped in the form of a book comprising two plates
mits of horizontal transport from one position to an other.
Hence, the present invention enables a single press to be
operated with three dies simultaneously; one die is disposed
in the cold part, a second die is disposed in the hot press
ing block, while the third die is emptied and provided
closed die. Hence, this method of partly opening the die
also requires a transport device, since the dies cannot be
transported over the lifting table if this latter is provided
with partitions.
A separate transport device is also necessary if, in an
other embodiment of the invention, studs adapted to move
vertically, which preferably are controlled electrically and
moved hydraulically, are provided on both sides of the
guiding grooves, which studs are capable of lifting the
tage of the press in accordance with the invention con 45 upper part of the die through a distance such that this
with new moulding material, and these operations require
only a single worker who, furthermore, has to do light
work only. Consequently, the press is particularly suita
ble for operation by unskilled labour. A further advan
sists in that it can also be operated with one die or with
two dies.
part is completely disengaged from the centering stud.
The advantage of this embodiment consists in that the
mould is not opened unless this is necessary.
In one embodiment of the invention, there is provided
on the lifting table a transport device in which two dies
For optimum tuning of the various cycles with one
can be placed side by side and which is capable of per 50 another to ensure the regular course of operations, ac
forming a horizontal movement over the lifting table. Al
cording to a further embodiment of the invention, the
though in principle the dies can bear directly on the
press is designed so that the heated pressing blocks and
lifting table and can be arranged thereon, such a trans
the cooled pressing blocks, in relationship with the thermal
port device facilitates the transport of the dies, while
energy delivered or withdrawn, are proportioned so that
55
mistakes are impossible.
the time required to heat the pressing blocks is approxi
mately equal to the time required to cool them.
‘In order to enable the die to be introduced in an al
ready hot condition into the hot pressing block, with a
In order that the invention may be readily carried out,
resulting shortening of the pressing period proper, ac
embodiments thereof will now be described, by way of
cording to a further embodiment of the invention means
example, with reference to the accompanying diagram
are provided to preheat a die arranged on the lifting table 60 matic drawings, in which
of the transport device in one of the free positions. Ac
FIG. 1 shows diagrammatically ?ve successive steps
I-V of the operation of a press for manufacturing
cordingto another embodiment of the invention, this pre
gramophone disc records,
heating treatment can be effected by providing a movable
electric heater element which preferably is controlled elec
FIG. 2 is a plan view of a so-called book, that is to say,
trically and moved hydraulically and can be applied to the
a die for pressing gramophone records,
FIG. 3 is a side elevation of the book of HG. 2 viewed
opened upper part of the die. Thus, the preheating treat
in the direction of the arrow,
ment is effected while the die is empty and opened.
According to an embodiment of the invention, the
FIG. 4 is a front elevation of the book of FIG. 2, like
lower part of the die is preheated by a vertically movable,
preferably electrically controlled and hydraulically moved
electric preheating element. In one embodiment of the
invention the movements of the two preheating elements
wise viewed in the direction of the arrow,
FIG. v5 is a plan view of the pressing table of a press
in a position corresponding to the position I of FIG. 1,
FIG. 6 is a sectional view of the table shown in FIG. 5
3
3,068,512
4
taken on the line VI—VI, viewed in the direction of the
parallel to the lower part until'the centering'stud'is ‘dis
arrow,
FIG. 7 is a sectional view of'the table of FIG. 5 taken
on the line VII—VII, viewed in the direction of the arrow,
FIG. 8 shows an alternative embodiment of a lifting
engaged from the upper part, and this movement is made
possible by the spring plates 14 and 15. To effect this
device for the upper part of a book,
FIG. 9 shows a book with the upper part opened, and
FIG. 10 shows an alternative embodiment of the heat
ing system for the upper part.
In FIG. 1, reference numeral 1 denotes a stationary
part of a hydraulic press, which part comprises a heated
portion 2, an insulating portion 3 and a cooled portion 4.
engage the lower surface of the widened upper part 12a
of the book. The lower part 13 is held by grooves in
members 32 which are secured to the slide. Hence, when
the book 6 is removed frornthe press in position IV of
FIG. 1, the lower part 13 slides in the grooves of the
members 32 and at the same time the upper part 12a is
A pressing block 5, which is continuously heated, for
example electrically, is connected to a pressing plunger 6
capable of vertical movement. A cooled pressing block
7 is connected to a likewise hydraulically movable
plunger 8. A lifting table 9 can be moved vertically by
two hydraulic plungers 1t} and 11. A transport slide 12
is mounted on this lifting table 9. The press contains two
dies in the form of books b and c, the book .5 being heated
and the book 0 being cooled. Another book a, which is
?lled with the material to be moulded, for example poly
vinyl chloride, lies on the slide 12. As is shown in posi
tion II, the lifting table is now moved to its uppermost
position and, simultaneously or after the table has reached
this position, the pressing block 5 is slightly raised. New
vertical movement of the upper part, bevelled pressure
members 31 are mounted on the slide, which members
forced vertically upwards by the pressure members 31.
When this upper part is disengaged from the centering
' stud 19, it can be swung open normally about the hinge 16.
An alternative embodiment for opening the book is
shown in FIG. 8. In this embodiment, the lifting table
9 contains a cylinder 33 in which a plunger 34 is adapted
to move. This plunger 34 is connected by levers 35 and
$5 to pressure studs 37 and 38 which pass through aper
tures in the lifting table and in the slide. If, now, the
plunger 34; is hydraulically moved to the left, the pres
sure studs 37 and 38 engage the projecting portions of
the upper part 12a, so that this part is raised vertically.
‘Furthermore, provision is made of a cylinder 39 in
which a plunger 40 is adapted to move. This plunger
carries an electric heater element 41. In the lowermost
position of the lifting table, this heater element 41 can
be raised through the apertures in the lifting table 9 and
‘book b can be pulled out of the press onto the slide 12.
Then this slide is moved to the right and the book a is
introduced into the press, which subsequently closes so
in the slide 12 so as to engage the lower surface of the
that the book a is heated, as is shown in position III. 30 stamper '18. ‘This’ permits ‘of heating the Stampers be
Then the lifting table 9 is lowered, until the position IV
fore it is ?lled with the moulding material, so that the
is reached, while the cooling block 7 descends slightly.
heat treatment proper can be shorter. Obviously, in this
The book 0, of which the contents are now suf?ciently
event two pressure studs 37 and 38 are provided on either
cooled, can be pulled out of the press onto the slide 12;
side, plungers 34 being disposed on both sides of the
then the slide is moved to the left, so that the book b can 35 heater element 41 and of the plunger 29. The upper part
be introduced into the press, after which the cooled block
of the book can also be preheated during ?lling. For
7 is raised and the, book b and its contents are cooled.
this purpose, the upper part 1212, which carries the stamper
Meanwhile, the book c becomes completely free, as is
17, in its open condition engages a heater element 42. A
shown by position V, and the moulded record can be re
switch 43 is pushed in so that an electromagnet d4 is ener
moved from this'book, after which the book is again ?lled
gised and the upper, part 12a is held magnetically. A
with moulding material and the condition of position I is
push-button 45 breaks the circuit, so that the die can be
reached. Thus, the correct position relative to the press
closed. The switch 43 also controls the movement of the
is always reached by'the complete movement of the slide
element 41. Alternatively, the heater element 42 may be
12, the operation of the press limited to moving the com
provided with a plunger 46, as is shown in FIG. 10. In
paratively light books into and out of the press and to
this event, this element is slightly retracted normally and
moving the slide and furthermore to the ?lling and empty
is moved to the upper part by operating the switch 43.
ing of the books.‘ As will be described hereinafter, a
Furthermore, the two elements need not continuously
part of these operations can be performed automatically.
engage the upper and lower parts of the book when'this
Preferably, the dies are shaped in the form of a book
is opened; a known timing relay can be used to ensure
of the kind described in copending US. application Serial 50 that the elements are withdrawn after a certain period of
'No. 720,687 ?led March 11, 1958, now Patent No. 2,984,
time. Furthermore, the elements can be provided with
867. Such a book comprises two parts 12a and 13 which
thermostats so that the temperature is kept substantially
are connected by means of two spring plates 14 and 15
constant. When the element 42 is adapted to move, the
to a hinge 16. Stamper blocks 17 and 18, on which the
upper part is preferably not held magnetically but locked
Stampers are mounted, are secured to the parts 12a and l3. 55
One of the Stampers is provided with a centering stud ‘
19. The edges of the stampers slightlyiproject beyond
mechanically.
A large part of the described operations can be simply
co-ordinated automatically. For this purpose, provision
can be made, as is shown in FIG. 1, of limit switches 46
the parts 12a and 13 to ensure satisfactory engagement
in the press with the heated or cooled pressing blocks.
and 47 between which the lifting table 9 can move. Fur
The parts 12a and 13 are provided with slots 26 to form 60 thermore, limit switches 48 and 49 are provided, one on
handles by means of which the book can be transported
each side of the slide, and ?nally a switch 50 is mounted
and opened.
on said slide. The various valves which control the
FIGS. 5, 6 and 7 show the position I, the lifting table
hydraulic systems, can be controlled electrically in known
and the slide being again designated‘ 9 and 12, respective
manner, if required, by means of a relay with delayed
ly. The lifting table 9 is raised or lowered by two plung
operation. Thus, the entire cycle will be as follows: when
Yers 21, which co-operate with two cylinders 22 and are
the die is ?lled in position I of FIG. 1, the lifting table
connected to the lifting table by junction pieces 23. The
is raised by pushing a button; when the table has reached
slide 12‘is provided wtih two blocks 24 and 25 which
its uppermost position, the switch 46 is operated so that
slide in the grooves'26 and 27 of the lifting table. The
the heated part of the press opens. The movement of the
slide is provided with an ear'23 to which a plunger 29 is
book b closes the switch 50 so that the slide is moved to
connected which can move in a ‘cylinder 36. Thus, the
the right until the switch 49 is ‘operated. Now another
slide 12Vcan be moved hydraulically. It "will ‘be appre
switch is opened by inserting the book a into the press,
ciated that the hook cannot normally be opened due to
so that the press closes and the lifting table 9 is lowered
the provision of the comparatively long-centering stud
until the switch 47 is closed. The press operator‘ now has
19; the upper part must ?rstbe moved vertically and 75 time to take the book 0 from the press since the cooling
3,068,512
5
6
block 7 now opens. When the book 0 has been taken
from the press, the slide moves to the left owing to the
fact that the book 0 again operates a switch, until the
slide strikes the switch 48. Then the book b can be
inserted in the press, but at the same time the device for
said three portions; and means associated with said elevat
ing means to preheat the dies.
lifting the upper part of the book 0 is rendered operative.
Hence, this upper part can be opened and now the ar
ed to receive a die including a hot-pressing member, cold
pressing means adapted to receive a die and including a
rangement shown in FIG. 10 becomes operative, the
heater element 41 engaging the lower part and the heater
cold-pressing member, said two means being arranged
vertically one above the other, elevating means for sup-'
3. A press for moulding with book-type dies articles,
such as phonograph records, from thermoplastic or ther
mosetting material; comprising hot-pressing means adapt
element 42 the upper part. After the book has been 10 porting two dies and movable vertically between one posi
tion level with said hot~pressing means and a second
?lled and closed, the element 41 has been lowered and
position level with said cold-pressing means, said elevat
the element 42 has been removed, the entire cycle can
again be started by pushing a button.
ing means having a central portion adapted to receive
the dies and to be positioned adjacent either of said ?rst
Obviously, the entire cycle need not be made auto
matic in this manner; a number of the described auto 15 two means and two end portions adapted to receive the
dies and located one on each side of said central portion;
matically operated switches can be displaced by manu
transport means for moving the dies horizontally between
ally operated push-buttons. It is desirable, however, that
said three portions; electrical means associated with said
the time required to heat the book between the pressing
elevating means to preheat the dies; and means actuated
blocks 5 and 2 should be substantially equal to the time
required for cooling between the pressing blocks 4 and '7. 20 by the opening of the dies to energize said electrical
In a press which was rendered semi-automatic in the
means.
4. A press for moulding with book-type dies articles,
manner described, the time required to mould a gramo
such as phonograph records, from thermoplastic or ther
phone record of diameter 10 inch was 90 seconds, that is
mosetting material; comprising hot-pressing means adapt
to say, the time interval between the ?lling of book a
and the instant at which this book, after its return to the 25 ed to receive a die including a hot-pressing member; cold~
pressing means adapted to receive a die and including a
?rst position, is again opened; hence, the moulding period
cold-pressing member, said two means being arranged
per record is 1/2 minute. The work of the operator com
vertically one above the other, elevating means for sup
porting two dies and movable vertically between one
so that this work is highly suitable for unskilled persons 30 position level with said hot-pressing means and a second
position level with said cold-pressing means, said elevat
of limited strength.
ing means having a central portion adapted to receive the
It will be appreciated that it is not necessary to operate
dies and to be positioned adjacent either of said ?rst
the press with three books. If a limited number of
two means and two end portions adapted to receive the
records is required, two books or even one book can be
used. The advantages of easy operation are retained, 35 dies and located one on each side of said central portion;
prises only moving the books into and out of the press,
?lling and emptying the book and pushing a few buttons,
however, obviously the press will work less economically,
since thermal energy is lost and, in addition, the capacity
of the press is not completely utilised.
What is claimed is:
1. A press for moulding with book-type dies ‘articles, 40
transport means for moving the dies horizontally between
said three portions; an electrical heater to preheat the
dies; and means controlled by the opening of the dies to
bring the dies and said heater into heat-transferring rela
tionship.
such as phonograph records, from thermoplastic or ther
5. A press for moulding with book-type dies articles,
mosetting material; comprising hot-pressing means adapt
such as phonograph records, from thermoplastic or ther
ed to receive a die including a hot-pressing member; cold
pressing means adapted to receive a die and including a
mosetting material; comprising hot-pressing means adapt
ed to receive a die including a hot-pressing member, cold
cold-pressing member, said two means being arranged 45 pressing means adapted to receive a die and including a
cold-pressing member, said two means being arranged
vertically one above the other; elevating means for sup
vertically one above the other; elevating means for sup
porting two dies and movable vertically between one posi
tion level with said hot-pressing means and a second
position level with said cold-pressing means, said elevat
ing means having a central portion adapted to receive
the dies and to be positioned adjacent either of said ?rst
two means and two end portions adapted to receive the
dies and located one on each side of said central portion;
porting two dies and movable vertically between one
position level with said hot-pressing means and a second
position level with said cold-pressing means, said elevat
ing means having a central portion adapted to receive
the dies and to be positioned adjacent either of said ?rst
two means and two end portions adapted to receive the
dies and located one on each side of said central portion;
and transport means for moving the dies horizontally be
55 transport means for moving the dies horizontally be
tween said three portions.
tween said three portions; hydraulic means for moving
2. A press for moulding With book-type dies articles,
said elevating means, a slide adapted to receive two dies
such as phonograph records, from thermoplastic or ther
and movable horizontally on said elevating means be
mosetting material; comprising hot-pressing means adapt
tween said three portions; hydraulic means to move said
ed to receive a die including a hot-pressing member, cold
pressing means adapted to receive a die and including a 60 slide between said two positions; and means to automati
cally open the dies upon movement of said slide.
cold-pressing member, said two means being arranged
vertically one above the other, elevating means for sup
References Cited in the ?le of this patent
porting two dies and movable vertically between one posi
UNITED STATES PATENTS
tion level with said hot-pressing means and a second posi
65
1,232,022
Gammeter ____________ __ July 3, 1917
tion level with said cold~pressing means, said elevating
1,520,214
Thomson ____________ __ Dec. 23, 1924
means having a central portion adapted to receive the
1,891,795
Buettell ____________ __ Dec. 20, 1932
dies and to be positioned adjacent either of said ?rst two
1,930,931
Fernberg ____________ __ Oct. ‘17, 1933
means and two end portions adapted to receive the dies
and located one on each side of said central portion;
transport means for moving the dies horizontally between 70
2,228,614
Soubier et al ___________ __ Jan. 14, 1941
2,859,477
Millhol’f ____________ __ Nov. 11, 1958
Документ
Категория
Без категории
Просмотров
0
Размер файла
669 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа