US2025900A - Recording and reproduction apparatus for mechanical sound records - Google Patents

Description

Dec. 31, 1935. K Ess ET AL 2,025,900

RECORDING AND REPRODUCTION APPARATUS FOR MECHANICAL SOUND RECORDS Filed Aug. 18, 1934 2 Sheets-Sheet l Dec. 1

K. RIESS ET AL 0 2,025,900

RECORDING AND REPRODUCTION APPARATUS FOR MECHANICAL SOUNDRECORDS I Filed Aug. 18, 1934 2 SheetS-Sheet-Z lip. 6'

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Patented Dec. 31, 1935 UNITED STATES RECORDING AND REPRODUCTION APPA- RATUS FOR MECHANICAL SOUND REC- OBDS Kurt Riess, Wolfen Kreis Bitter-field, and one Liebchen and Walter Schultze, Dessa halt, Germany uinAnassignors to LG. Farbenindustrie Aktiengesellschaft, Frankfort-on-the- Germany Main,-

Application August 18, 1934, Serial No. 740,488 In Germany August 19, 1933 Claims. Our present invention relates to a recording nd reproducing apparatus for mechanical sound record on band-shaped record bases.

One of its objects is an improved apparatus of this kind which is eflicient and simple in construction. Further objects will be seen from the detailed specification following hereafter. Reference is made to the accompanying drawings in which Figs. I to 3 represent an embodiment of the invention in longitudinal section,

Figs. 4 and .5 show individual parts of the device shown in Figs. 1 to 3 in a section transversely to the sectional direction of Figs. 1 to 3,

Fig. 6 shows a front view of the pick-up device,

Fig. 7 shows a plan view of the pick-up device and Fig. 8 shows a longitudinal section of the pickup device.

According to the invention the pick-up or recording head of such apparatus is fitted to the hinged lid of the housing of the apparatus. A device provided in the apparatus prevents the needle or stylus from coming into contact with 5 the sound record base when the lid of the housing is closed. Furthermore, there may be fitted a' device which renders it impossible for the stylus to be let down on to the supporting guide for the sound record band when a record band has not been inserted.

The invention will now be described with reference to the accompanying drawings.

The pick-up or recording head I is fixed on the lid 2 of the housing of the sound recording and reproducing apparatus, in such a manner that it emerges outside the lid as soon as the latter is opened. When the lid 2 is opened, a lever 3 which is articulated at one end to the lid and at the other connected with a pawl 4, by the intervention of an escapement wheel 6 turns the cam disc 5 so that the pawl 4 comes up against a pin 1. The cam disc 5 is disposed in such a manner that, when the lid is closed and the pick-up connected therewith is lowered, the latter bears against a projection 8 on the cam disc 5, so as'to prevent the needle or stylus coming into contact with the sound record bas'e placed over the film guiding roller 9. By turning a.lever II which is in frictional connection with cam disc 5 in the direction indicated by the arrow in Fig. '2, the cam disc 5 is turned so that the-recess l2 takes the place of the projection 8. The pick-1:: to such an extent as to permit the stylus to come into contact with the sound record base.

a film is inserted, a finger it engages, as indiis, by so doing, lowered A bar I 3 articulated to the lever l lprevents the lever II from being moved when the lid is open. In order to prevent the stylus from coming into contact with the guide'roller 9 for the film when cated'by dotted lines (Fig. 5) in a. notch l5 on the cam disc 5 and prevents rotation of the latter until the finger is pressed, overcoming the force of the spring it, out of the notch l5 by the sound record base I0. 10

The pick-up is mounted in the lid of. the housing in such a manner that it can be displaced transversely to the direction in which the sound record band runs. The pick-up is preferably pivotally mounted and flexibly connected with its 15 adjusting device. Its 'distance from the sound record base can .be adjusted without its being necessary for the apparatus to be opened to dose.

In order that it may be possible to carry out all necessary adjustments of the pick-up or the 20 stylus in relation to the record band or to the guide track on the record band when the lid of the housing is closed, the said lid is preferably made of transparent material, for example of glass or of so-called splinter-proof glass over its 2 entire area. or may be only opposite certain particularly important places in the film guide.

Figs. 6, 7 and 8 show a controllable pick up device which consists of a permanent horseshoe magnet having between its pole shoes 22 the 0 armature 23 which bears the coil 24 and the recording or reproducing stylus 25. Sheet metal pieces 26 and 21 are secured to the magnet. These pieces contain the bearings for pins 28 and 29, so that the magnet can be swung horizontally. 3 The pins 28 and 29 are secured to the intermediate piece 30 which is rotatably mounted on the axle 3|. The axle 3! is fixedly mounted on the walls 32 of the casing; the magnet may therefore be swung in vertical direction. Control of 40 the magnet in horizontal direction, that is to say rotation about pins 38 and 29 is effected by turning wheel 33. This wheel is mounted on the axle 34 which is rotatably mounted in the walls 32 of the casing; onthe screw thread of 45 this-axle there may be displaced the piece 35 which is not fixedly mounted on the horseshoe magnet but resiliently by the springs 36. The

axle 34 may be arranged above or below thehorseshoe magnet, it may, however, as shown, 50 also traverse the magnet. In this case, the limbs must contain borings 31 which have a greater diameter than the axle. The stylus is adjusted on the sound record base, that is to say in vertical direction by means of wheel 38 55 in the same manner as in horizonal direction. According to rotation of the pick-up device in right-hand or left-hand direction, spring 39 or guiding a band shaped carrier for a sound groove on a normal path, a support over which said car-.

rier is guided for scanning the latter and a sound box including a stylus mounted in said lid so as to be capable of engaging said carrier when closing saidlid.

2. An apparatus for mechanically recording or reproducing sounds which comprises in combination a casing open-sided at the top, a lid hinged to said casing for covering the opened side of said casing, means arranged insaid casing for guiding a band shaped carrier for a sound groove on a normal path, a support over which said carrier is guided for scanning the latter, a sound box including a stylus mounted in said lid so as to be capable of engaging said carrier, means for preventing said stylus to engage said carrier on closing said lid and means for bringing said stylus into contact with said carrier after closure of said lid.

3. An apparatus for mechanically recording or reproducing sounds which comprises in combination a casing open-sided at the top, a lid hinged to said casing tor covering the opened side of said casing, arranged in said casing for {guiding a band shaped carrier for a sound groove on, a normal path, a support over which said carrier is guided for scanning the latter, a sound box including a stylus mountedin said lid so as tobe capable of engaging said carrier, means for preventing said stylus to engage said carrier on closing said lid, means for bringing said stylus into contact with said carrier after closure of said lid, means controlled by said carrier for preventing said stylus to contact with said support when no carrier is inserted in said guide means and means for laterally moving said stylus when the lid is closed.

4. An apparatus tor-mechanically recording or reproducing sounds which comprises in combination-a casing open-sided at the top, a lid .hinged to said casing for covering the opened side of said casing, means arranged in said casing for guiding a band shaped carrier for a sound groove on a normal path, a support over which said carrier is guided for scanning the latter, a sound box including a stylus mounted in said lid so as to be capable of engaging said carrier, a cam disk provided with projections mounted in said casing so that on closing said lid said sound box comes to lie on said cam disk, an escapement wheel mounted in fixed relation with said cam disk, a lever articulated at one end to the lid, a pawl hinged to the free end of said lever and engaging said escapement wheel, so that on closing said lid one of said projections receives said sound box, means for bringing said stylus into contact with said carrier after closure of said lid, means controlled by said carrier for prevent,

ing said stylus to contact with said support when no carrier is inserted in said guide means and means for laterally moving said stylus when the lid is closed.

5. An apparatus for mechanically recording or reproducing sounds which comprises in combination a casing open-sided at the top, a lid hinged to said casing for covering the opened side of said casing, means arranged in said casing for guiding a band shaped carrier for a sound groove on a normal path, a support over which said carrier is guided for scamiing the latter, a sound box including a stylus mounted in said lid so as to be capable of engaging said carrier, a cam disk provided with projections mounted in said casing so that on closing said lid said sound box comes to lie on said cam disk, an escapement ,wheel mounted in fixed relation with said cam disk, a lever articulated at one end to the lid, a pawlhinged to the free end' of said lever and engaging said escapement wheel, so that on closing said lid one of said projections receives said sound box, a second lever in frictional connection with said cam disk, a second pawl rotatably connected with said second lever, a spring urging said pawl against said engagement wheel so that on turning said lever it turns said engagement wheel and thereby said cam disk whereby said stylus engages said carrier, a second spring pulling said-second lever in the direction of said first lever, means controlled by said carrier for preventing said stylus to contact with said support when no-ca-rrier is inserted in said guide means and means for laterally moving said stylus when the lid is closed.

' KURT RIESS. OTTO LIEBCHEN. WALTER SCHULTZE.

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