DE1572481C3

DE1572481C3 - Device on magnetic tape recorders, in particular on those with three-motor drive and resilient tape tensioning means

Info

Publication number: DE1572481C3
Application number: DE19671572481
Authority: DE
Inventors: Eberhart Bartos; Heinz Zinke
Original assignee: NORDDEUTSCHE MENDE RUNDFUNK KG 2800 BREMEN
Current assignee: NORDDEUTSCHE MENDE RUNDFUNK KG 2800 BREMEN
Priority date: 1967-12-20
Filing date: 1967-12-20
Publication date: 1974-06-20
Also published as: DE1572481B2; DE1572481A1

Description

3 43 4

fungs-Einrichtung hat die erfindungsgemäße Dämp- Dämpfungsorgan vorgesehen werden. Beim dargefungseinrichtung auch ein »Vor- und Rück- Verhält- stellten Ausführungsbeispiel, s. dazu auch F i g. 2, ist nis«, d. h. die Dämpfung erfolgt nach beiden Dreh- hierfür ein pneumatisches Organ verwendet, das in richtungen des Fühlhebels stark unterschiedlich. einfacher Weise aus einem Kolben 12 besteht, der in Es werden keine Steuermittel für den die aufwik- 5 einem Zylinder 13 hin- und herbewegt wird. Der kelnde Vorratsrolle antreibenden Motor benötigt. Kolben 12 ist mit einer kleinen Stange 14 an den He-Das beim Start von der laufenden Tonrolle sofort ge- bei 9 angelenkt. Ferner ist im Zylinderboden ein lieferte Band, das sich noch nicht auf der Vorrats- Membranventil 15 angeordnet und bei diesem Ausspule aufwickeln kann, da die Trägheit des antrei- führungsbeispiel im Zylindermantel in der Nähe des benden Motors nur ein allmähliches In-Gang-Kom- io Zylinderbodens ein Regulierventil 16, das zum Einmen der aufwickelnden Vorratsrolle ermöglicht, wird stellen des Dämpfungsgrades dient,
augenblicklich durch das Ausschwenken des Die Vorrichtung funktioniert nun folgendermaßen: Schwenkhebels in Form einer Schlaufe aufgefangen. Nach Einschalten des Gerätes läuft zum Antrieb zu-Das Band bleibt dadurch immer in Führung. Sobald nächst der die Tonrolle 1 und ihre Schwungmasse 2 der die aufwickelnde Vorratsrolle antreibende Motor 15 antreibende Motor. Wird dann beispielsweise auf Bandzug liefert, wird die Schlaufe nicht sofort, son- Wiedergabe geschaltet, so drückt die Andruckrolle 3 dem ganz allmählich zurückgebildet, wodurch rück- das Tonband 5 gegen die bereits laufende Tonrolle 1 wirkende Beeinflussungen auf die am Tonkopf zu er- und noch bevor der Wickelmotor anläuft, wird bezielende konstante Bandgeschwindigkeit (Jaulen) reits von der Tonrolle 1 Band 5 gefördert. Dadurch vermieden werden. 20 entsteht, wie in Fig. 2 dargestellt ist, eine Band-„ ,.. ^ j τ-.τ- j schleife 5. An dieser Stelle liegt aber der Führungs-Erläuterung der Erfindung _{stift 8 am Band 5 an und fäng}f zunächst die sich bil-Fungs device has the damping damping member according to the invention are provided. In the case of the display device, there is also a “fore-and-aft-ratio embodiment, see also FIG. 2, ist nis «, ie the damping takes place after both rotations - a pneumatic element is used for this, which differs greatly in the directions of the feeler lever. simply consists of a piston 12, which in There are no control means for which the cylinder 13 is moved back and forth. The motor that drives the supply roll is required. Piston 12 is immediately articulated at 9 with a small rod 14 on the He-Das when the running clay reel starts. In addition, there is a tape in the bottom of the cylinder, which is not yet arranged on the supply diaphragm valve 15 and can be wound up during this unwinding, since the inertia of the drive example in the cylinder jacket in the vicinity of the running engine only results in a gradual start-up. io cylinder base a regulating valve 16, which enables the supply roll to be taken in, is used to set the degree of damping,
The device now works as follows: The pivot lever is caught in the form of a loop. When the device is switched on, it runs towards the drive - the belt always remains in the lead. As soon as next the sound roll 1 and its flywheel 2 of the motor 15 driving the supply roll that is being wound up. If, for example, the tape is delivered, the loop is not switched immediately, but rather playback, so the pressure roller 3 pushes the backwards very gradually, whereby the tape 5 against the already running tape roller 1 has an effect on the recording head and Even before the winding motor starts up, the constant tape speed (yowling) is already being conveyed by the tape roll 1 tape 5. This can be avoided. 20 results, as shown in FIG. 2, a band- ", .. ^ j τ-.τ- j loop 5. At this point, however, the guide explanation of the invention is _{pin 8 on the band 5 and begins} f first which develop

^i Ein Ausführungsbeispiel der Erfindung wird an dende Schleife S ab. Wie aus der Zeichnung ersicht- ^ Hand der F i g. 1 bis 3 erläutert. Es zeigt lieh ist, geschieht das dadurch, daß die Feder 11 den Fig. 1 einen Ausschnitt aus dem Antriebsteil für 25 Hebel9 in Pfeilrichtung um den Drehpunkt 10 ein Magnetband, schwenkt. Dabei wird auch der Kolben 12 über die F i g. 2 und 3 in Schemadarstellungen die Wir- Stange 14 in Pfeilrichtung bewegt, d. h in den Zylinkungsweise eines Bandspanners mit Dämpfungsor- der 13 hinein. Die zwischen Kolben- und Zylindergans, boden etwa befindliche Luft wird durch das Mem-In F i g. 1 ist mit 1 die Tonrolle bezeichnet, die in 30 branventil 15 ausgestoßen. Nun wird durch Anlaufen bekannter Weise als verlängerte Achse einer des Wickelmotors das Magnetband 5 in Pfeilrichtung Schwungmasse 2 ausgebildet ist. Wird beim Einschal- gezogen, und zwar mit einer Kraft, die stärker ist als ten des Magnetbandgerätes zwecks Aufnahme oder die der Feder 11. Das Magnetband 5 strafft sich und Wiedergabe die Andruckrolle 3 durch Schwenken ih- die Schleife S würde schwingend wieder glattgezogen, res Trägers 4 an die Tonrolle 1 herangedrückt, so 35 wenn nicht das Dämpfungsorgan 12, 13 vorhanden wird dadurch das Magnetband 5 gefaßt und in Pfeil- wäre. Das ziehende Magnetband 5 zieht über den richtung an den Magnetköpfen 6 und 7 zur Auf- Führungsstift 8, den Hebel 9 und die Stange 14 an nähme 6 oder Wiedergabe 7 vorbeitransportiert. dem bis zum Anschlag in den Zylinder 13 hineinge-Gleichzeitig wird auch der hier nicht mitgezeichnete schobenen Kolben 12. Das dadurch zwischen dem Wickelmotor eingeschaltet. Es soll sich beim Ausfüh- 40 Kolbenboden und dem Zylinderboden infolge Schlierungsbeispiel um einen Drei-Motoren-Antrieb han- ßens des Membranventils 15 entstehende und immer dein. Da jedoch die Tonrolle 1 mit ihrer Schwung- stärker werdende Vakuum wirkt der Zugkraft des masse 2 bereits läuft, wenn die Andruckrolle 3 heran- Magnetbandes 5 entgegen. Durch Verstellen des Re- b-Λ gefahren und der Wickelmotor eingeschaltet wird, gulierventils 16 ist nun ein in seiner Stärke stetig J bildet sich im ersten Moment eine Bandschleife S, so 45 nachlassendes Vakuum einstellbar, so daß der KoI-wie es in F i g 2 schematisch dargestellt ist, da die ben 12 langsam aus dem Zylinder 13 herausgezogen Tonrolle 1 schon Band fördert bevor der Wickelmo- wird und demzufolge der am Hebel 9 angeordnete tor beginnt, es aufzuwickeln. Zum weichen Abfangen Führungsstift 8 die Bandschleife S in gedämpfter einer solchen Bandschleife S ist ein Führungsstift 8 Rückstellbewegung bis in die in F i g. 3 gezeichnete vorgesehen, der am freien Ende eines gebogenen He- 50 Betriebslage zurückführt.^ i An embodiment of the invention is applied to the loop S from. As can be seen from the drawing- ^ hand of FIG. 1 to 3 explained. It shows borrowed is done by the fact that the spring 11 of Fig. 1 a section of the drive part for 25 levers 9 in the direction of the arrow around the pivot point 10 a magnetic tape pivots. The piston 12 is also moved over the FIG. 2 and 3 in schematic representations, the wire rod 14 moves in the direction of the arrow, d. h in the cylinking manner of a strap tensioner with a damping order 13. The air between the piston and cylinder gooseneck bottom is passed through the mem-in F i g. 1 is denoted by 1, the clay roller, ejected in 30 branventil 15. Now the magnetic tape 5 is formed in the direction of the arrow flywheel 2 by starting in a known manner as an extended axis of one of the winding motor. Is pulled when switched on, namely with a force that is stronger than th of the magnetic tape recorder for the purpose of recording or that of the spring 11. The magnetic tape 5 tightens and playback, the pressure roller 3 by pivoting it- the loop S would swing smoothly again, res The carrier 4 is pressed against the sound roll 1, so 35 if the damping element 12, 13 is not present, the magnetic tape 5 is thereby gripped and indicated by the arrow. The pulling magnetic tape 5 pulls over the direction of the magnetic heads 6 and 7 to the guide pin 8, the lever 9 and the rod 14 to take 6 or playback 7 transported past. into the cylinder 13 as far as it will go - at the same time, the pushed piston 12, not shown here, is also switched on between the winding motor. In the execution of the piston head and the cylinder head, as a result of the Schlieren example, there should be a three-motor drive for the diaphragm valve 15 which is created and always occurs. However, since the sound roll 1 with its increasing momentum vacuum acts, the tensile force of the mass 2 is already running when the pressure roll 3 approaches magnetic tape 5. By adjusting the Re- b-Λ and the winding motor is switched on, the regulating valve 16 is now a constant in its strength J , a belt loop S is formed at the first moment, so 45 decreasing vacuum can be set so that the KoI -as in F ig 2 is shown schematically, since the ben 12 slowly pulled out of the cylinder 13 tape roll 1 is already conveying tape before the winding motor is and consequently the gate arranged on the lever 9 begins to wind it up. For the soft interception of the guide pin 8, the belt loop S in a damped one such belt loop S , a guide pin 8 is a return movement up to the position shown in FIG. 3 provided, which leads back to the free end of a curved He- 50 operating position.

bels 9 angeordnet ist. Dieser Hebel ist um den Dreh- In F i g. 1 ist schließlich noch ein Federdrahtbügel punkt 10 schwenkbar und ein kurzes Stück darüber 17 dargestellt, der am Andruckrollenträger 4 befemit einer Feder 11 verbunden, die ihn in Pfeilrich- stigt ist und der mit seinem Bügelende hinter eine tung zu drehen sucht. Dadurch wird die sich beim Nase 9 α des Hebels 9 greift. Er gewährleistet, daß Anlaufen des Bandantriebes bildende Schleife S ab- 55 nach dem Abstellen des Gerätes der Hebel 9 mit dem gefangen und federnd nachgiebig während des Lau- Führungsstift 8 in eine äußerste Ausgangslage zufens des Antriebes zurückgeführt. Da aber für diesen rückgeholt wird, damit der Führungsstift 8 beim EinZweck des möglichst weichen Abfangens der Band- legen eines Magnetbandes 5 nicht hinderlich im schleife am besten eine Schraubenfeder 11 verwendet Wege ist.bels 9 is arranged. This lever is around the rotary In F i g. 1, finally, a spring wire clip point 10 is pivotable and a short piece above 17 is shown, which is attached to the pressure roller carrier 4 with a spring 11 which is in the direction of the arrow and which seeks to rotate its clip end behind a device. As a result, the lever 9 engages at the nose 9 α. It ensures that the start of the belt drive forming loop S ab- 55 after the device has been switched off, the lever 9 with which is caught and resiliently returned during the Lau guide pin 8 to an outermost starting position towards the drive. Since, however, it is retrieved for this, so that the guide pin 8 is not an obstacle in the loop, a helical spring 11 is best used for the purpose of catching the tape layers of a magnetic tape 5 as smoothly as possible.

wird und bekanntlich diese Federart nur eine sehr 60 Das Dämpfungsorgan kann auch aus magneti-■ geringe Eigendämpfung besitzt, muß zur Vermeidung sehen, beispielsweise elektromagnetischen Mittelnis and as is well known, this type of spring only a very 60 The damping element can also be made of magnetic ■ has little inherent attenuation, must see to avoid, for example, electromagnetic means

von Ausschwingbewegungen, die bekanntlich Jaulge- bestehen, deren magnetsiche Kraft langsam abneh-of swinging movements, which, as is well known, consist of Jaulge, the magnetic force of which slowly decreases.

räusche erzeugen können, ein feinregulierbares mend durch elektrische Angriffe gesteuert wird.can generate noises, a finely adjustable mend is controlled by electrical attacks.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

'. ■■. . ι ■ / ■. ■■:. ■ ".:, · ..2. As a result, magnetic tape is already conveyed by the tape reel in claims: Direction of the take-up reel is conveyed before its motor is running.

1. Device on magnetic tape recorders. Aids for interception and jerkless off, devices, especially on those in which 5 resemble such a start-up loop, the supply roll winding the magnetic tape would briefly be driven by its own motor after switching on distorted sounds or tones is and reproduced, 'the resilient tensioning means for intercepting hi-fi devices in particular. when are undesirable. ,, J ₁ .

Start-up of the magnetic tape has already been attempted at start-up

Tape loops are provided, the tape loops resulting from a magnetic tape device being caught by elastic tensioning means from a hollow spring connected to a return spring with the help of appropriately shaped bow springs and preferably made of round wire at its free end. It is difficult, if not impossible, to have such pivoting levers provided with a guide pin resting on the magnetic tape, to make the spring elements adjustable in terms of their restoring force and with a pneumatic damping device 15 -speed, as it is in setting connection an optimal setting is required. This indicates that the damping devices of all types for intercepting the device consist of a cylinder (13) which on the belt loops have only a small amount of internal damping due to a movement that can be moved in it. As a result, after catching the piston (12) and on the other side through a strap that was created after switching on, a lid with valves (15, 16) loops initially a few times around the middle position of the one, one of which is valve (15 ) while the magnetic tape is in operation, and rr, designed as an automatically acting pressure relief valve until the deflections are formed by being consumed and the other manually adjustable vibration energy of the spring has ended. The res secondary air valve (16) for regulating a vacuum that sets the above-mentioned spring oscillations is na damping force. also on the front of the magnetic heads

2. Device according to claim 1, characterized in that the accompanying part of the magnetic tape is transferred, that the dimensioning of the damping is then carried out when starting the recording or fungskraft in such a way that it is distorted when a reproduction is formed. This creates a Jaul ribbon loop the overpressure beeps during start-up.

valve (15) through the resilient tensioning For a further solution to this problem are

means (11) generated overpressure instantly swing lever with a hydraulic damping opens, so that the tape loop through the Füh- device is known (USA.-Patent 3,130,936). Rungsstift (8) is immediately intercepted ', and that this known damping device is so subsequently create after the start of the motor for 35 that they in both directions of movement, the winding supply roll and thus the left or right rotation of the sensor lever , resulting band tension, to which the force of the spring has the same damping. With the rotation axis counteracts the tensioning means, the tape loop of the feeler lever is also connected to control means (Potentio- (S) is only gradually reduced by meter), with which the tensile force of the. through the adjustable secondary air valve (16) only 40 winding roller driving motor regulated so slowly again air is behind the piston that the vacuum created by the swivel lever can flow in. loops adjust to a medium length where -3. Apparatus according to Claim 1, characterized in that the torque of the supply being wound up is controlled by the motor driving the guide pin (8) for the roller. V i Catching strap loops (S) wearing 45

Swivel lever (9) via a spring clip (17) with autgabe

the carrier (4) for the tape pressure roller (3) in the invention is based on the object of a

Setting connection is established. when starting a magnetic tape recording device

I advise you to compensate for any tape loops created behind the clay roller as softly and smoothly as possible,

around the occurrence of so-called yowling noises

Avoid switching on the tape drive during recording or playback. This task is carried out by

_,., _,., the invention specified in claim 1 solved.

. State of the art *-..&& & &

The invention relates to a device advantages

on magnetic tape recorders, in particular all the basic disadvantages of the known

on those with three-motor drive and resilient belt loop catching devices that are without sufficient

Clamping devices for catching up when the self-damping starts to work, could with the counter-tape resulting belt loops. fio stood the invention to be eliminated. Such a

It is known that, particularly in the case of magnets, the damping device according to the invention is simple

tape recorders powered by three and inexpensive to manufacture. In contrast to the one mentioned

Motors that use the magnetic tape from US Pat. No. 3,130,936 will not do that here

Rolling supply roll driven by its own motor- torque that drives the winding supply roll is controlled when the magnetic tape starts driving the motor, but the tape tension

Short-term belt loops caused by the sound roller are solely due to the torque of the motor

namely by the fact that the clay roller drive motor and the radius of the already wound Teilwik-

already running before the winding motor starts, so that kels determined. In contrast to the well-known damping