DE6912109U - TAPE RECORDER WITH REVERSIBLE CASSETTE - Google Patents

Description

GRUNDIG EMC
Electro-mechanical research institute

Inn .: Max Grundig
85Io FUrth / Bay «, Kurgartenstrasse 37

Fürth, 2 * 1.3.1969 782 / He / Sc

Reg.

Tape recorder with reversible cassette

The innovation concerns a tape recorder with a reversible cassette, which can be placed on the tape recorder in two positions turned by 180 ° against each other and two winding cores carrying a tape roll and on the upper side of the cassette and on the lower side of the cassette each has a scale for displaying the desired audio track locations by means of a dial pointer which can be driven by a threaded spindle.

Ea aind tape length counters for tape cassettes known, which can only be played on from one side, i.e. not designed as reversible cassettes. Here is a threaded spindle built into the tape cassette, via a suitable gear, preferably from the take-up plate here, is driven. The threaded spindle then moves a rider, which is designed as a dial pointer and which allows the revolutions of the take-up reel to be tracked on a fixed scale. This scale is

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neither calibrated in meters of tape length nor minutes of playing time and thus allows easy reading of the tape status of the tape cassette in operation.

A tape recorder of the type specified at the beginning has already been proposed in which in the The tape cassette designed as a reversible cassette provided the threaded spindle with a worm wheel at each end is. When this tape cassette is turned over, the threaded spindle is then driven by the same reel plate and thus the dial pointer moves. This operating mode is only possible if the tape cassette is only turned when the tape is in the start or end position, i.e. when the entire tape is Tape is on a reel. Should the cassette, however, be turned when the tape is in a partial unwinding is in the cassette, so will the dial display is wrong, as the following example shows:

The simple playing time of a full tape wickeis amounts to 3o minutes; there are 560 layers of tape on it a coil. Now run the tape for 10 minutes and watch from the full supply spool to the empty take-up spool. During this time, the take-up spool on the AnTang makes the empty take-up spool

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22o revolutions, the supply spool, which is full at the beginning, only 16o revolutions. So it remains on the supply reel 560 - 160 »4ou turns left.

The dial pointer, driven by the take-up reel, moves a length corresponding to 22o reel revolutions. The current take-up reel now has 400 turns and the current supply reel has 22o turns. Now normal forward is switched on again until the tape is completely on the: - take-up reel. The winding "spool 560 - Uoo" makes 160 revolutions and the dial pointer will only move by a length corresponding to 160 revolutions. Before the cassette was turned, the dial pointer moved a length of 220 revolutions, ie the dial pointer did not reaches its end pitch even though the tape is completely wound · The komat because the sum of the tape windings in intermediate positions on both reels is not constant · In our special case, the sum of the tape windings after 10 minutes of playing time is Ί00 + 22o m 62o; At the beginning, when the whole tone * * tape is on a reel, it only has 560 turns

Wiffti

The innovation concerns a tape recorder old one cassette of the genre, veleb »· does not have the aforementioned deficiencies and at deal di Tape length display independent of tape and heia Respective ·! This means that the cassette is turned over synchronously, since Neuerungageaäß the threaded spindle via a aufeitseadea Worm wheel optionally in one or the other Direction of rotation can be driven because in one Xassettenlage the worm wheel with one on the part of the gate « ratawickelkernachae driven device-fixed screw and in the turned Kaaaettenlage the worm wheel old one fixed device driven by the winding core axis Worm is engaged.

In the following, an example of an approach is given on the basis of FIGS. 1 and 2 of the innovation described · See these figures

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Openings for magnetic tapes and dia bandandruok roll In a narrow side surface as well as two pairs of openings in the bottom and top surface for placing the cassette on the tape recorder (not shown) coils 3 _t k and yes aina scale provided on the Kaasettenoner- and Kaaaettenunteraeite 5 desired to display Tonspureteilen means of a like solitary Skalenzeigera 6, the driven iat by a Gewindeapindel 7 "the figure shows a Vendekassette 1 old represents full feed bobbin 3 and represents empty Aufwickelepule H the screw shaft 7 is optionally characterized drivable via a aufsitzendes at its end worm wheel 8 in the one or the other rotational direction, DAO in a "η Kaasettenlage daa worm wheel 8 with a part of the stock roll core axis driven device featen screw and in the turned Kaasettenlage the worm wheel 8 driven with one on the part of the Aufwickelkernachae A device-enabled worm 10 is engaged. The chain path foot has 6swei openings 11 on the upper and lower sides for the passage of the fixed screws 9, Io. On the threaded spindle 7 sits a dial pointer 6, which is moved longitudinally to it when the threaded spindle 7 is rotated and which can be observed through the transparent in this area Kaaaette 1 ■ it scale 5, which can be observed by expressions

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and / or Kinprägunean 12 dar aua tranaparantan Kunatatoff beatebendaη Kaaaattenwandung is formed. The drive of the gertttefeaten ScLneoke 9 takes place from the Aohae the supply reel 3, while the device feate screw Io ir. The case illustrated mitlauft empty driven k from the axis of Aufwickelkerna · If now turned over the cassette to any teilweiaen Bandabapulzuetand, then the The threaded spindle 7 is driven by the worm Io and the worm wheel 8. The dial pointer 6 runs ao atets synchronously and always indicates the correct tape position, ao that the tape can be forwarded or rewound in any direction without the synchronism between the respective WickeIkernachae and the The tape status display is lost.

Claims (2)

1. Tape recorder with reversible cassette, which is in xwel, un in each case 180 ° facing one another daa tape recorder can be attached and two winding cores carrying a tape roll and on the Top and bottom of the chain? one per Scale for displaying the desired audio tracks by means of a dial pointer which can be driven by a threaded spindle, characterized in that the threaded spindle (7) Via a seated worm wheel (8) either in one or the other direction of rotation is drivable that in one Kaasettenlage the worm wheel (8) with one on the side of the supply winding Axle-driven device-fixed (9)
Worm and, in the turned cassette position, the worm wheel (8) is in engagement with a worm (io) that is fixed to the device and driven by the winding machine. 69121 i \ 1, 2nd tape "ndf * rH"; n «ol» thereby «« k · OtWvIoSmBt ₄ 4 «0 d— S« lm * «k * iirMl (8) • In ·· Bad · dor 0 ·« 1ιμ9 ·· ρ1ιη1 · 1 (7) * lt «t and da · K «S« * tt «n- ff * httus · (1) otMr- and unfrm ^ itig % «« 1 uff now «· η (11) sub Dtnr ^ htritt d« re «rMt« f «at * n 8οηη ·· Ικ · η (9, Ιο ) «Ufwelst. ■ t "t · ■ ' turn