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Патент USA US3072303

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Jan. 8, 1963
3,072,293
E. GRETEN
APPARATUS-FOR CONTROLLING THE PRODUCTION OF CHIPBOARDS
Filed April 29. 1960
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United States Patent
5"
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3,072,293
Patented Jan. 8, 1963
2
1
the feeding arrangement by controlling the motor which
3,072,293
APPARATUS FOR CGNTROLLING‘THE PRO
DUCTION 0F CHIPBOARDS
Ernst Greten, Springe, near Hannover, Germany, assignor
to Bahre Metallwerk Kommanditgesellschaft, Springe,
drives an endless conveyor belt 10 to which are supplied
chips provided at 11 with a binding agent. After passing
' through the weighing device, the removed mat material
is returned to the belt 10, as indicated by a continuation
of the line 7. An endless scraper 13 and scraper rolls 14,
15 operate to even out the chip material which is sup
plied at 12 to the forming station.
It the measuring mechanism of the weighing device
near Hannover, Germany, a company of Germany
Filed Apr. 29, 1960, Ser. No. 25,725
Claims priority, application Germany May 2, 1959
4'Claims. (Cl. 222—55)
10 determines that the speci?c weight of the previously
This invention relates to an apparatus for controlling
the supply of chip material to the forming station of a
strewn mat material is too high, a reduction of the speed
terial from a constructed chip mat between sections cor
form a mat thereon, said feeding means including an end
of the conveyor belt is effected. Accordingly the quantity
of chips leaving the forming station on the conveyor belt
chip board plant and apparatus for carrying out the
in unit time is reduced, so that with uniform speed of the
method.
The problem of obtaining a constant speci?c Weight of 15 conveyor belt 1, the thickness of the layer of strewn chip
material becomes less. The opposite procedure takes
constant chip mat formed in a chip board plant had been
place if the weighing device 5 determines that the speci?c
solved by controlling the speed of operation of the feeding
weight of mat material is too low.
arrangement of the forming station according to the
I claim:
measurement of the speci?c weight of the mat. To deter
11. Apparatus for forming a mat of chips comprising a
mine the speci?c weight, each section of the mat has
conveyor, means for feeding chips to the conveyor to
been weighed at the control point with its support, formed
form a mat thereon, said conveyor having means for sep
of sheet metal, before it has been inserted into the chip
arating from the mat a portion of the mat, a device respon
board press. This method of working is relatively com
sive to the speci?c weight of said portion of the mat,
plicated. Furthermore its accuracy is‘not suf?cient; to
gether with this, in weighing at any given time, the factor 25 means for conveying said portion to the device and means
for controlling said feeding means in accordance with the
of a slow wearing away of the underlying support enters
response of said device to said speci?c weight whereby
into it. The consequence of variations in the theoretical
the rate of feeding chips to the conveyor is increased in
value of the speci?c weight is temporarily substantially
response to a portion of low speci?c weight and decreased
delayed.
The present invention provides a method of controlling 30 in response to a portion of high speci?c weight.
2. Apparatus for forming a mat of chips comprising a
the supply of chip material at the forming station of a
conveyor, means for feeding chips to the conveyor to
chip board plant which comprises dividing out chip ma_
less belt in position for distributing chips on the con
responding in length and breadth to the capacity of a chip
board press, determining the speci?c weight of the divided 35 veyor, a variable speed motor and a driving connection
between the motor and the belt, said conveyor having
out material and controlling said supply in accordance
means for separating from the mat a portion of the mat,
with the measurement of said speci?c weight.‘
a device responsive to the speci?c weight of said portion
The present invention also provides, in a chip board
of the mat, means for conveying said portion to the de
plant, apparatus'comprising a conveyor on which a mat
is formed, means for feeding chip material to said con~ 40 vice and means for controlling said motor in accordance
with the response of said device to said speci?c weight
veyor, means for separating out a transverse strip from
whereby the speed of the belt is increased in response to
said mat between sections of a length suitable for press
a portion of low speci?c weight and decreased in response
ing, a device for determining the speci?c weight of the
to a portion of high speci?c weight.
chip material of said strip, means for conveying said strip
3. Apparatus for forming a mat of chips comprising
to said weighing device and means for controlling said 45
a pair of pulleys, an endless belt conveyor suspended be
feeding means in accordance with the measurement of
tween the pulleys, means for feeding chips to the conveyor
said speci?c weight.
to form a mat thereon, said conveyor having a plurality
In the drawing is shown diagrammatically an arrange—
of auxiliary members secured thereon at spaced intervals
ment for the production of chip boards in accordance
with the invention.
50 whereby the mat is ruptured to separate a portion there
On an endless conveyor belt, meta1 sheets 2 are trans
“4'EN
from as one of the members travels over one of the pul
ported whose capacity correspond to that of a chip board
press. During the uniform movement of the conveyor
belt chips are likewise strewn uniformly. This strewing
leys, a device responsive to the speci?c weight of said
portion of the mat, means for conveying said portion to
the uppermost layers of the resulting mat consist of ?ne
chips whilst the intermediate part of the mat contains
speci?c weight whereby the rate of feeding chips to the
the device and means for controlling said feeding means
can be carried out in such a way that the lowermost and Or 01 in accordance with the response of said device to said
essentially only larger chips. Between each two sheets
conveyor is increased in response to a portion of low
speci?c weight and decreased in response to a portion
2 an auxiliary sheet 3 is attached to the belt and overlaps
of high speci?c weight.
the edges of the sheets 2. In the width of the auxiliary 60
4. Apparatus for forming a mat of chips comprising a
pair of pulleys, an endless belt conveyor suspended be~
sheet 3 a double cut is made at a chosen time according
to the construction of the mat. The metal sheets 2 may
be removed from the conveyor belt by any suitable means.
The strip width a so formed is ?rst of all removed from
the apparatus, as is shown at a’. The removed stripa is 65
put on a transversely moving conveyor belt 4 from which
it is put into a weighing device 5. In the drawing this is
tween the pulleys, a plurality of press sheets on the con
veyor, said conveyor having a plurality of auxiliary mem~
bers secured to the conveyor between the press sheets,
means for feeding chips to the conveyor to form a mat
on the sheets and members, said members extending in
overlapping relation with the adjacent edges of the press
sheets, whereby the mat is ruptured to separate a portion
indicated by the trough 6 and the line 7. The weighing
therefrom as one of the members travels over one of
device 5 determines the speci?c weight of the mat mate
rial. The measuring mechanism of this weighing device 70 the pulleys, a device responsive to the speci?c weight of
5 is electrically coupled through the circuit 8 with a con
said portion of the mat, means for conveying said portion
to the device and means for controlling said feeding
trol mechanism 9 which determines the working speed of
3,072,293
3
means in accordance with the response of said device to
2,851,063
Leinhart ____________ _'__ Sept. 9, 1958
said speci?c weight whereby the rate of feeding chips
2,886,210
2,900,109
2,925,835
2,953,460
2,993,625
Cooper et a1. _________ __ May 12, 1959
Hoopes et a1 __________ __ Aug. 18, 1959
Mojonnier et a1. ______ __ Feb. 23, 1960
321,358
413,602
Switzerland __________ __ June 15, 1957
Germany ____________ __ May 21, 1925
to the conveyor is increased in response to a portion
below speci?c Weight and decreased in response to a por
tion of high speci?c Weight.
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,753,099
2,778,387
Jenner et a1. __________ __ July 3, 1956
Diehl _______________ __ Jan. 22, 1957
Baker ______________ __ Sept. 20, 1960
Esval _______________ __ July 25, 1961
FOREIGN PATENTS
10
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