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Патент USA US2404761

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' ~ July‘ 231» 1946-
‘
H. WESTERKAMP ‘
'
2,404,761
METHOD OF PRODUCING BRIDGING MATRIX FOR ENDLESS SOUND BANDS
' Filed Oct. 29, 1941
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2,404,761
Patented July 23, 1946
UNITED STATES PATENT OFFICE
2,404,761
llIETHOD OF PRODUCING? BRIDGING MA-‘ '
TRIX FOR ENDLESS SOUND BANDS
'
Hugo Westerkamp, Koln-Poll,‘ Germany; vested
in the Alien Property Custodian
Application October 29, 1941, Serial No. 417,027
In Germany July 8, 1940
3 Claims. (01. iii-48.3)
l
The invention relates to a method of producing
endless sound bands with several sound tracks
running parallel to the edge of the band and
being mechanically reproducible.
It is known to produce endless sound bands of
said kind by connecting the ends of an openended sound band with the aid of a bridging
matrix. The known method proposes to produce
2.
.
.
.
Fig. 2 is a'perspective view of a reproduction
matrix.
.
v Fig. 3 is an elevation of the patrices.
' Fig. 4 is an elevation of the patrices after being
joined and with a part of the connecting lines
having been cut.
Fig. 5 is an elevation of the bridging matrix.
Fig. 6 is a diagrammatic view showing the em
ployment of the bridging matrix in connecting
before a pressing or stamping matrix is made 10 the ends of the duplicate sound record.
Fig. 1 shows an endless original sound band
from the original. In most cases, this cannot be
constituting the starting material for the method
carried out, because the sound record on the orig
according to the invention. The original sound
inal sound band is ,completely destroyed at the
band
consists, for example, of a wax band, i. e.
portion from which the bridging matrix has been
15 a carrier layer covered with a Wax layer, into
produced.
which a. sound, groove is continuously cut in
According to the invention, the ends of the
known manner, this sound groove having a length
open-ended sound band, with a number of par
amounting to a multiple of the length of the
allel sound tracks produced by a pressing or
sound band and running parallel to the edge of
stamping process, are connected by means of a
the band. I is the carrier layer of the original
bridging matrix which has been produced from
sound band, 2 is the wax layer, and $3 is the
the bridging matrix from the original sound band,
the original sound band or from a copy thereof.
sound groove cut into the wax layer.
Advantageously, the bridging matrix is obtained
From the endless original sound band there are
by producing patrices from the ends of the orig
produced the duplicate open-ended sound bands
inal matrix, which patrices are cut, ?tted to
by stamping, pressing, casting or the like by
gether, soldered, and engraved with continuous 25 means of a matrix. For this purpose, the end
sound tracks, and from the one piece obtained
less, original sound band is cut for example at
in this manner, the bridging matrix is produced,
4 so as to obtain an open-ended band, from
for example, by a galvanoplastic moulding process.
which is made, for example by a galvanoplastic
This bridging matrix may be manually brought 30 process, an open-ended original matrix 5‘ (Fig. 2)
to engage the sound tracks at the ends of the
serving to produce an open-ended patrix which,
duplicated open-ended sound band, which ends
on the other hand, serves to produce an open
are ?tted together or are arranged so as to over
ended pressing or stamping matrix.
lap each other for the purpose of being con
By cutting the endless original sound band, the
nected, whereupon the sound grooves at each end 35 sound tracks 3 have been interrupted; the. cut
are brought into engagement with the corre
‘ting of the original sound band, and especially
sponding sound ribs of the bridging matrix. But
the production of the matrix and of the patrix,
this bringing into engagement is rather difficult
result in a small loss of the band and, conse
and in order to make it easier, the original sound
quently, in a. loss of a part Of the sound record
band is provided, according to the invention, on 40 so that, when the ends of the individual dupli
both sides of the out part and outside the sound
cate sound bands produced are ?tted together,
track bundle, with marks, for example in the form
the associated sound tracks will no longer exactly
of depressions. These depressions are formed in
producing the pressing matrix and the open
ended sound band made from this matrix as
well as in producing the bridging matrix, the
marks thus formed on the ends of the sound
band being brought to engage the corresponding
marks formed in the bridging matrix when con
necting the ends of the sound band.
An example of the method according to the
invention is diagrammatically illustrated in the
accompanying drawing, in which:
Fig. 1 is a perspective view of an original sound
record.
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run in the same lines.
But it is absolutely nec
essary that the sound tracks should run exactly
in the same lines so as to prevent the reproducing
needle from jumping out of the sound track or»
entering another sound track.
In order to prevent this, the ends of the sound
band are connected. according to the invention
50 by means of a bridging matrix which is produced
in the following manner:
Patrices are produced from each of the ends a
and b of the original matrix 5 (Fig. 2), for exam
ple by a galvanoplastic process; these two
The
55 patrices are shown at 6 and ‘I in Fig. 3.
.
2,404,761
3
4
edges of the ends of the band 5, originally irreg
ular, owing to the galvanoplastic production, are
advantageously cut straight before being placed
in the galvanic bath. The parts 6 and 1 of the
patrices are then aligned with the sound tracks,
?tted and soldered together. The transverse and
longitudinal alignment is advantageously effected
band, to bring the sound ribs of the bridging
matrix into engagement with the sound grooves
in the free ends of the sound band, which is thus
eiTected automatically.
What is claimed is:
>
1.. A method of producing endless sound bands
having a number of mechanically reproducible
sound tracks running parallel to the edge of the
by means of an optical magnifying method.
After the parts 6 and ‘I of the patrix have been
soldered together or connected in some other 10 band, which comprises preparing from an origi
nal sound record band having a number of me
manner so as to form one piece, thefsound tracks,
chanically reproducible sound tracks running
though transversely aligned,.being still separated
parallel to the edge thereof, an open-ended ma
trix, preparing open-ended duplicate sound rec
ords from said matrix, preparing patrices corre
by the solder joint or the like; are connected by
engraving connecting tracks so as to- obtain con
tinuous sound tracks. Fig. 4 shows the con 15
sponding to end portions of the matrix, aligning
nected parts 6 and 1 of the patrix with one half
and uniting the end of said patrices correspond
of the sound tracks connected by engraved con
ing
to the open ends of the matrix and forming
necting tracks and the other half of the sound ~
,
across
the union continuous engraved record lines
tracks still separated by the solder joint or the
like.
joining the record lines existing on the patrices,
-
20 preparing a bridging matrix from the united and
Thereupon the connected parts 6 and ‘(of the
engraved patrices, and connecting. the ends of the
open-ended duplicate record by employing the
bridging matrix to impress the point of connec
tion whereby the sound tracks on the endless
patrix are used to producaalso by a galvano»
plastic process, a pressing or stamping matrix
8 (Fig. 5) which represents the desired bridging
matrix.
25 duplicate recordare made continuous.
The ends of the individual duplicate open-snob
2. A method of producing endless sound bands
ed sound band, produced, for example by a press
having a number of mechanically reproducible
ing or stamping process, are now ?tted together
sound tracks running parallel to the edge of the
on the bridging matrix in such a manner that
the sound grooves on the ends of the band engage so band from an original sound record band having
a number of mechanically reproducible sound
the corresponding parts of the ribs of the bridg
ing matrix, as far as ?tting parts exist on the
tracks running parallel to the edge of said origi
two ends of the band, on the one hand, and on
nal record band, which comprises forming align
the bridging matrix, on the other hand. This
ing marks in spaced apart relation along the
engagement, may be effected manually. The free 35 length of the original record band, preparing
ends of the band are advantageously cut obliquely
from the original record band an open-ended
along the original separating line 4 (Fig. 1) and
matrix
having marks thereon corresponding to
are, preferably ehamfered, brought to overlap
each other, as illustrated in Fig. 6, in which ‘the _
bridging matrix is again marked 8 and the ends
of the duplicateband are marked 9 and I0. By
applying heat and pressure, the ends of the band
are united by means of a pressing member I! so
as to form an endless band. In this uniting proc
ess, the connecting lines of the sound grooves,
engraved manually in the production of the
bridging matrix, are pressed into the material of
the duplicate sound band, so that the endless
sound band is also provided with uninterrupted
sound grooves at the connecting point.
said aligning marks, preparing open-ended du
40 - plicate sound records fromv said matrix having at
each end locating marks reproducing said align
1ng marks, preparingpatrices corresponding to
end portions of the matrix having thereon marks
1 corresponding to said locating marks, aligning
‘ and uniting the ends of said patrices correspond
ing to the open ends of the matrix andforming
across the union continuous engraved record lines
joining the record lines existing on the patrices,
50 preparing a bridging matrix from the united and
engraved patrices having thereon locating marks
The engagement of the sound grooves at the
free ends of the band in its open-ended form
corresponding to the marks on said patrices, and
with the sound ribs of the bridging matrix is dif?
aligning the bridging matrix with the ends of
cult and requires much time. In order to facili
thev open-ended duplicate records and connecting
tate this operation, the endless original sound 65 the said ends while maintaining the alignment
band is provided, according to the invention, on
and employing the bridging matrix to impress the
both sides of the cutting line ii outside the sound
point of connection whereby the sound tracks on
track region with marks, which are moulded in
the endless duplicate record are made continuous.
the production of the pressing matrix and of the
3. A method of producing a bridging matrix for
open-ended sound band made therefrom as well 60
as in the production of the bridging matrix. The
use in duplicating an original endless sound rec
marks may, for example, consist of depressions
ord band having a number of mechanically re
in. the wax layer of the original sound band. In
producible sound tracks running parallel to the
Fig. 1 there are indicated on the right of the
cutting place 4 three depressions I2, and on the
left of the cutting place three depressions [3.
In the original matrix 5 (Fig. 2), these depres
sions are represented by projections l2’, l3’, and
edge of the band, which comprises preparing
from the original record band an open ended ma
trix, preparing patrices corresponding to the end
portions‘ of the matrix, aligning and uniting the
end of said patrices corresponding to the open
in the sound band produced in series they are
again in the form of hollow depressions. On the 70 ends of the matrix and providing the point of
other hand, the original depressions form pro
union with continuous record lines existing on the
jections in the bridging matrix, so that it is easy,
patrices, and preparing a bridging. matrix from
by inserting these projections in the correspond.
ing depressions. in the free ends of the sound
the joined patrices.
~
HUGO WES'I‘ERKAMP.
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