Патент USA US2404761код для вставки
' ~ July‘ 231» 1946- ‘ H. WESTERKAMP ‘ ' 2,404,761 METHOD OF PRODUCING BRIDGING MATRIX FOR ENDLESS SOUND BANDS ' Filed Oct. 29, 1941 A g . ’ Awe/7 z‘a: ' I 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. ' ' ' 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.