DE1572511B2

DE1572511B2 - Tape-controlled tape stop device for cassette tape recorders

Info

Publication number: DE1572511B2
Application number: DE19671572511
Authority: DE
Inventors: Marcel Jules Helene Brüssel Staar
Original assignee: Staar Development Co SA
Current assignee: Staar Development Co SA
Priority date: 1966-04-18
Filing date: 1967-04-15
Publication date: 1970-11-05
Also published as: BE679667A; DE1572511A1

Description

Die Erfindung bezieht sich auf eine bandzuggesteuerte Bandstopeinrichtung für Kassettentonbandgeräte für die Aufnahme/Wiedergabe auf bzw. von Magnettonbändern.The invention relates to a tape-tension-controlled tape stop device for cassette tape recorders for recording / playback on or from magnetic tapes.

Bei solchen Geräten soll nach vollständigem Ablaufen des Bandes von einer Spule das Gerät stillgesetzt oder der Bandzug für den Rücklauf umgeschaltet werden.In such devices, the device should be stopped after the tape has completely run off a reel or the belt tension for the return can be switched.

Bandstopeinrichtungen für Kassettentonbandgeräte weisen für die Unterbrechung der elektrischen Stromkreise einen Ausschalter auf, der dann betätigt wird, wenn das Band von der Ablaufspule vollständig abgelaufen ist.Tape stop devices for cassette tape recorders indicate the interruption of the electrical circuits an on-off switch, which is operated when the tape has completely run out of the pay-off reel is.

Solche Betätigungseinrichtungen sind mehrfach bekannt bzw. vorgeschlagen worden. So offenbart die deutsche Auslegeschrift 1200 564 eine Einrichtung, bei der der Spulennabe der Bandablaufseite ein Kontaktkreuz zugeordnet ist, das bei vollständigem Ablauf des Bandes in derjenigen Stellung verharrt, die durch den Zug am Bandende vorgegeben ist, das seinerseits als Schlaufe um einen Stift der Kassettenspule gelegt ist. Diese Einrichtung besitzt den Nachteil, daß die Kontaktanordnung mit einem Schleifkontakt dauernd im Reibungseingriff steht, obwohl sie nur bei Bandende wirksam werden soll, so daß zusätzlich noch Verzögerungsmittel nötig sind.Such actuating devices are known or have been proposed several times. So reveals the German Auslegeschrift 1200 564 a facility, in which a contact cross is assigned to the reel hub of the tape run-off side, which when the run-off is complete the tape remains in the position that is predetermined by the train at the end of the tape, the is in turn placed as a loop around a pin of the cassette reel. This facility has the disadvantage that the contact arrangement is constantly in frictional engagement with a sliding contact, although it should only take effect at the end of the tape, so that additional delay means are necessary.

Bei der in der deutschen Auslegeschrift 1222 700 vorgeschlagenen Einrichtung ist der Bandablaufteller nebst der Spulennabe auf einem Schwenkarm angeordnet; diese Einrichtung hat den Nachteil, daß ihre Wirkungsweise auf den Fertigungstoleranzen beruht, die mehr oder weniger groß sein können und daher sorgfältige Justierbarkeit erfordern.The device proposed in the German Auslegeschrift 1222 700 is the belt run-off plate arranged next to the reel hub on a swivel arm; this device has the disadvantage that their Mode of action is based on the manufacturing tolerances, which can be more or less large and therefore require careful adjustability.

Die durch die deutsche Auslegeschrift 1261 332 vorgeschlagene Einrichtung spricht nicht auf den Bandzug, sondern auf den Stillstand einer der mit dem Band im Eingriff stehenden oder mitgenommenen Wellen an; die dort vorgesehenen, mit zeitlicher Verzögerung infolge zähflüssigen Schmiermittels arbeitenden Nockenhebel lassen eine zuverlässige Wirkungsweise auf die Dauer des Betriebes nicht erwarten. The German Auslegeschrift 1261 332 proposed device does not speak to the belt tension, but to the standstill of one of the the belt engaging or entrained shafts; those provided there, with time Delay due to viscous lubricant working cam levers allow a reliable mode of operation do not expect for the duration of the operation.

Durch die deutsche Auslegeschrift 1261687 ist eine Einrichtung vorgeschlagen worden, die auf den Bandzug anspricht, das Gerät jedoch nicht bei verstärktem Bandzug infolge Stillstands des Abwickeltellers, sondern im Gegenteil bei entfallendem Bandzug infolge Bandriß stillsetzen soll. Diese Einrichtung macht von einem Taster für den Bandzug Gebrauch, wie er ähnlich auch bei der Einrichtung nach der Erfindung verwendet wird, wie weiter unten noch zu erläutern.By the German Auslegeschrift 1261687 is a device has been proposed that is responsive to tape tension, but not the device when amplified Belt tension due to standstill of the unwinding plate, but on the contrary when the belt tension is no longer applicable should stop as a result of tape rupture. This device makes use of a button for the belt tension, as it is used similarly in the device according to the invention, as will be discussed further below explain.

Schließlich ist auch bereits vorgeschlagen worden (deutsche Auslegeschrift 1267438), durch eine der mit dem Band mitlaufenden Wellen einen Pulsgenerator anzutreiben, wobei das Vorhandensein einer ständigen Pulsfolge den Ausschalter geschlossen hält.Finally, it has also already been proposed (German Auslegeschrift 1267438), by one of the to drive a pulse generator with the belt traveling shafts, the presence of a constant pulse train keeps the switch closed.

Aufgabe der Erfindung ist es demgegenüber, eine Einrichtung der eingangs genannten Art zu schaffen, bei deren Funktion die Bandlaufrichtung keine Rolle spielt und die einfach im Aufbau und zuverlässig in der Wirkungsweise ist.In contrast, the object of the invention is to create a device of the type mentioned at the beginning, in the function of which the direction of travel of the belt does not play a role and which are simple in construction and reliable in the mode of action is.

Zur Lösung dieser Aufgabe ist die Einrichtung nach der Erfindung gekennzeichnet durch eine bewegliche Platte zur Betätigung des Ausschalters, die ihrerseits manuell in ihre Betriebsstellung bewegbar ist, in welcher sie die beweglichen Betriebselemente in Wirkverbindung mit den ortsfest angeordneten Betriebselementen bringt. Die Platte trägt einen Taster, der in Kontakt mit dem Band steht und nach vollständigem Abrollen des Bandes von einer Tonbandspule durch den weiterhin auf das Band ausgeübten Zug zwischen der Bandzugwelle und einer Leitrolle betätigt wird. Die Platte trägt eine drehbare Nockenscheibe, die auf einer auf der Platte fest angeordneten Achse sitzt und die mittels des Tasters in Wirkverbindung mit der Bandzugwelle gebracht werden kann, so daß damit die Platte aus der Betriebsstellung herausbewegt wird. Dabei werden natürlich sowohl die beweglichen Elemente von den festen Elementen gelöst als auch der Ausschalter betätigt, so daß das Gerät mechanisch und elektrisch in Ruhestellung gelangt.To solve this problem, the device according to the invention is characterized by a movable one Plate for actuating the circuit breaker, which in turn can be manually moved into its operating position is, in which they the movable operating elements in operative connection with the stationary operating elements brings. The plate carries a button that is in contact with the tape and after it is complete Unwinding the tape from a tape reel by continuing to exercise on the tape Train between the tape tension shaft and a guide roller is operated. The plate carries a rotatable cam disc, which sits on an axis fixedly arranged on the plate and which is in operative connection by means of the button can be brought with the tape tension shaft, so that the plate is moved out of the operating position will. In doing so, of course, both the movable elements are detached from the fixed elements and the on / off switch is actuated so that the device is mechanically and electrically in rest position.

Die Erfindung soll nun an Hand der Zeichnungen im einzelnen beschrieben werden.The invention will now be described in detail with reference to the drawings.

F i g. 1 ist eine teilweise geschnittene Seitenansicht (Schnitt nach der Linie I-I in F i g. 2) eines Ausführungsbeispiels der Einrichtung nach der Erfindung; F i g. 2 ist eine Draufsicht auf die Einrichtung;F i g. 1 is a partially sectioned side view (section along the line I-I in FIG. 2) of an exemplary embodiment the device according to the invention; F i g. Figure 2 is a plan view of the device;

F i g. 3 zeigt einen Schnitt nach der Linie III-III in Fig. 1;F i g. 3 shows a section along the line III-III in Fig. 1;

F i g. 4 ist ein Vertikalschnitt nach der Linie IV-IV in Fig. 3;F i g. Fig. 4 is a vertical section on the line IV-IV in Fig. 3;

F i g. 5, 6 und 6 A zeigen den gleichen Schnitt wie die F i g. 4, jedoch in anderen Betriebsstellungen;F i g. 5, 6 and 6 A show the same section as FIG. 4, but in other operating positions;

F i g. 1A, 7, 8, 9 und 9 A sind schematische Darstellungen zur Illustration der Wirkungsweise;F i g. 1A, 7, 8, 9 and 9A are schematic representations to illustrate the mode of action;

F i g. 10 zeigt ein abgewandeltes Ausführungsbeispiel. F i g. 10 shows a modified embodiment.

In den Figuren bildet eine Platte 1, die horizontal angeordnet zu denken ist, einen Teil des Gerätechassis I¹ (Fig. 1 und IA), und in der Kassette2 ist das Tonband 3 auf Spulen 4 und 5 (F i g. 7 bis 9) aufgespult bzw. wird von diesen abgespult, indem es über die Leitrollen 7 und 8 geführt wird.In the figures, a plate 1, which is to be thought of as being arranged horizontally, forms part of the device chassis I ¹ (FIGS. 1 and IA), and in the cassette 2 the tape 3 is on reels 4 and 5 (FIGS. 7 to 9 ) is wound up or is unwound from this by being guided over the guide rollers 7 and 8.

Der Bandantrieb erfolgt über die Bandzugwelle 6, die mit einem nicht dargestellten Motor in Wirkverbindung steht.The belt drive takes place via the belt tension shaft 6, which is operatively connected to a motor (not shown) stands.

Gemäß der Erfindung befindet sich auf der Platte 1 und vor der Aussparung für die Kassette die Bandstopeinrichtung für die Ausschaltung des Gerätes bei Beendigung des Bandlaufs.According to the invention, the tape stop device is located on the plate 1 and in front of the recess for the cassette for switching off the device at the end of the tape run.

Die Einrichtung umfaßt eine bewegliche Platte 9 in langgestreckter Form, die ein Auge 10 aufweist, welches von einer Achse 11 durchsetzt ist, so daß die bewegliche Platte 9 um die Achse 11 schwenken kann.The device comprises a movable plate 9 in elongated shape having an eye 10, which is penetrated by an axis 11, so that the movable plate 9 can pivot about the axis 11.

An ihrem der Achse 11 entgegengesetzten Ende ist die bewegliche Platte 9 in Form eines Knopfes 12 ausgebildet, auf den manuell eine Kraft in Richtung zur Kassette ausgeübt werden kann.At its end opposite the axis 11, the movable plate 9 is in the form of a button 12 formed, on which a force can be exerted manually in the direction of the cassette.

Auf der Platte 9 ist mit üblichen, nicht dargestellten Befestigungsmitteln der Aufnahme-Wiedergabe-Kopf 13 befestigt, der demgemäß die Schwenkbewegungen der Platte mitmacht.The recording / playback head is on the plate 9 with conventional fastening means (not shown) 13 attached, which accordingly takes part in the pivoting movements of the plate.

Die Achse 14 ist vertikal auf der Platte 9 angeordnet; um sie ist schwenkbar ein Hebel 15 gelagert, der sich im wesentlichen parallel zur Platte 9 erstreckt und dessen Ende nächst der Achse 11 vertikal hochgebogen ist und einen Winkel 16 bildet, der einen Taster 17 trägt. Dieser wirkt zwischen zwei Rollen 18 so auf das Band 3 ein, daß dieses während des Bandlaufs den Taster 17 wellenförmig umschlingt (bei 19).The axis 14 is arranged vertically on the plate 9; a lever 15 is pivotally mounted around them, the extends essentially parallel to the plate 9 and the end of which is bent vertically upwards next to the axis 11 and forms an angle 16 which carries a button 17. This acts between two rollers 18 so on the tape 3 that this wraps around the button 17 in a wave shape during the tape run (at 19).

In der Ruhestellung des Mechanismus stütz sich der Hebel 15 auf einem Anschlag 20 ab, der fest mit der Platte 9 verbunden ist, und zwar mittels einer Feder 21, deren eines Ende in einen Vorsprung des Hebels 22 auf dem Arm 23 desselben eingehangenIn the rest position of the mechanism, the lever 15 is supported on a stop 20, which is fixed with the plate 9 is connected by means of a spring 21, one end of which is in a projection of the Lever 22 is mounted on the arm 23 of the same

Claims

3 43 4

is and the other end of a shoulder 24 and begins to take in the direction of arrow Fl to a pin 25, around which a rotate .. This allows the tape tension shaft to the further U-angle 26 can be pivoted. This instructs drive to take over the cam disk. As a result of two bearing projections 27, the one axis 29 for which the cam disk 35 is due to its bearing of the outer shape together with the belt tension shaft 6 together with the axis.34, which bear with the acting counter-pressure roller 28. Plate 9 is connected, pushed outwards so that

A spring 30 is on the one hand in a pin 31 which also moves the plate itself outwards. At the is firmly connected to the movable plate 9, one end of this movement (Fig. 6) falls the tip 51 of the hung and on the other hand in a pin 32 in the plate projection 50 in a second recess of the U-angle 26. It acts biasing on the U-angle io lamellar spring 53 (recess 54), whereby the 26, so that the counter-pressure roller 28, the belt 3 against the cam disk and the belt tension shaft from each other the tape tension shaft 6 presses. be separated. Under the action of spring 40

An approach connected to the movable plate 9 returns the cam disk to its starting firing pin 33 limits the movement of the U-angle position, with the small projection 35 back to the 26 in the other direction. 15 stop 39 is applied.

On the movable plate 9 is an axis 34. At the same time, the plate 9 presses against the insulating vertical arranged around which a cam disk stoffinger 49 of the switch 44, whose contacts 35 can turn. Their outer cam track 36- 47,48 open, whereby the circuits of the sits generally in the shape of a spiral and tension can be disconnected and the device reaches the same level with a recess 37 around the belt tension 20 is mechanically switched off at an early stage (Fig. 6A and wave around without touching them while the 9A). The function corresponds to that of FIGS. 1 to 9. Tape runs. Fig. 10 shows a modification in which the

The cam has a small extension 38 pivotable plate 9 through a. displaceable on, which is replaced during the tape run against one of plate 9 ¹ , which has two grooves 55, supported in the plate 9 stop 39, and 25 which for the purpose of guiding the plate pins or other although under the action of a biasing spring 40, Guide elements 56 sit, which are carried by the chassis I ^1, the end of which normally exerts a pressure on the plate 1 or from the plate 1 thereof. Set of adjusting springs 38 exerts and which loops around the axis 34, 57 are on the one hand on the sliding plate 9 ¹ , where it is attached with its other end 41. the other hand attached to the chassis for moving

The cam disc also has a small extension to make it easier for the plate supporting the mechanism to Set 42 on which the end 43 of the lever 15 presses in the described embodiment

can work. while the tape is running the recording-playback

The device is completed by a circuit breaker 44, head 13 the tape 3 against a pressure element 13 ¹ , which is normally closed, the head being arranged on the movable plate 9 otherwise two blades 45 and 46 with contacts 47 and 35, and the Counterpressure roller 28 pushes as it includes 48; at the end of the lamella 46 is an insulating also on the plate 9, the tape is attached against the stoffinger 49, which is in operative connection with the tape tension shaft 6; movable plate 9 can be stepped on during the switch-off process. The active compounds of the aforementioned parts

The setup works as follows: First it is interrupted.

the cassette 2 inserted (Fig. IA), and by pressure 40. It will be understood that the head 13 is also firmly attached to the button 12, the movable plate 9, which could be arranged and move the pressure element, the mechanism described above and the one with the borrowed Disk and that also carries the recording / playback head, on its in the tape tension shaft with its motor with the disk moving-F i g. 2 and 3 brought place shown; While the counterpressure roller could be one of this process, the contacts 47 and 48 on the one hand and the cam disk on the other hand could sit firmly on the chassis of the circuit breaker 44 in contact with one another. The triggering by the brought, and a tip 51 of a projection 50 of the button 17 would then of course. also from the fixed movable plate 9 comes into engagement with a protruding part of the device,
It should also be noted that the spring 53 is connected to the chassis 1 in this way. 50 is formed that it counteracts the movement of the plate 9

The closing of the contacts 47, 48 has the consequence of supporting the end of the same, so that the cam disc disengages the electrical circuits and thus also the belt tension shaft, and the motor is connected to voltage, which also brings the cam disc back into its neutral position Output tape tension shaft 6 begins to rotate, and it can return to the position (Fig. 6 A).
Volume 3 in the direction of arrow F (Fig. 2) forward 55
pulls. .- ..,. · ";., ......-. ·.

After playing at the end of the tape (Fig. 8); if patent claims

so z. B. the coil 4 is completely emptied, the ^y
Volume 3 as a result of the continued tape pull through the

Shaft 6 between this and the guide roller 7 under 60 1. Belt tension-controlled belt stop device for increased tension because the reel is empty and the cassette tape recorder with an off switch, Tape tension can no longer be followed by further unwinding which is closed during operation, characterized by a movable plate

As a result of this increased train, the button (9) to actuate the switch (45, 46), the pressed outwards (Fig. 5); the lever 15 pivots 65 is manually movable into the operating position in which around the axis 14, and its end presses against small them the movable operating elements in the active approach 42, whereby the cam disk 35 is brought into operative connection with the stationary operating connection with the belt tension shaft 6 brings elements, and which carries a button (17),

which is in contact with the tape (3) and after the tape has completely unrolled from one of the Tape reels due to the tension still exerted on the tape between the tape tension shaft (6) and a guide roller (7) is actuatable, and further characterized by a rotatable about a fixed on the plate (9) arranged axis (34) arranged cam disk (35), which by means of the Button (17) in operative connection with the belt tension shaft (6) for rotating the cam disk (35) and thus the movement of the plate (9) can be brought out of its operating position.

2. Device according to claim 1, characterized in that the operating elements movable with the plate (9) the recording / playback head, which is provided with a ^{pressure element (13 1} ), and a counter-pressure roller (28) connected to the tape tension shaft (6) can be brought into operative connection as a result of the movement of the plate (9).

3. Device according to claim 1, characterized in that the recording-playback head stationary and the associated pressure element are movably arranged with the plate.

4. Device according to claim 1, characterized in that the tape tension shaft and her Motor are movably arranged on and with the plate, while the associated counter-pressure roller is stationary.

5. Device according to claim 1, characterized in that it is arranged on a horizontal, part of the device chassis (I ¹ ) forming plate (1) in front of the recess intended for the cassette, that it is an elongated one at one end about an axis (11) rotatable plate (9), which is designed at the other end in the form of a manual control button (12) for a rotary movement of the plate (9) in the direction of the cassette and which carries a small vertical axis (14) around which a Lever (15) is pivotable, which at its end facing the axis (11) for the plate rotation movement carries the button (17) which interacts with the band (3) and around which the band is guided and which runs through a wave path.

6. Device according to claim 5, characterized in that in the rest positions of the device the lever (15) against a stop (20) fixedly connected to the movable plate (9) is pulled by means of a spring (21), one end of which with the lever (15) and the other end is connected to a pin (25), for example the one around which a lever (26), which the counter pressure roller (28) and its assigned axis (29), is pivotably mounted, for which a spring (30) is provided.

7. Device according to claims 1 to 6, characterized in that the cam disk (35) is rotatably mounted about an axis (34) arranged vertically on the movable plate (9) and an outer cam track (36) generally in the form of a spiral or one Has part of a spiral, but in the operating position of the movable plate with a recess (37) embraces the tape tension shaft without touching the same.

8. Device according to claims 1 to 7, characterized by a projection (38) the cam disk, which in the operating position of the movable plate (9) against one of these carried stop block (39) is applied under the action of a spring (40), one end of which under bias of the projection (38) is connected to this and the other end around the vertical axis (34) of the cam disk (35) is looped and attached to it.

9. Device according to claim 1, characterized in that the off switch (45,46) has two Lamellae with contacts (47,48) and that one end of a lamella (46) has an insulating finger (49) which is in operative connection with the movable plate (9).

10. Device according to claim 1, characterized in that the movable plate (9 ¹ ) by means of two grooves (55) and in these engaging guides (56) on the plate (1) which is part of the chassis (I ¹ ) of the device forms, is arranged displaceably, and that on the one hand with the movable plate (9 ¹ ) and on the other hand with the chassis connected adjusting springs (57) are provided to facilitate the movement of the plate (9 ¹ ).

11. Device according to one or more of claims 1 to 10, characterized in that with the chassis (1) a spring (53) is fixedly connected, which has a first recess (52) for the Receipt of the tip of a projection (50) arranged on the movable plate (9) in the Has operating position of the plate, while a second recess (54) receiving the projection tip (51) is used when the plate is moved out of its operating position.

12. Device according to claim 11, characterized in that the spring (53) for the support the movement of the plate (9) when the cam disk (35) is released from the belt tension shaft (6) and the return is formed in the starting position.

For this purpose 2 sheets of drawings