DE1963613C

DE1963613C - Device for keeping the tape tension of a tape-shaped sound carrier constant when recording magnetic sound and reproducing it again

Info

Publication number: DE1963613C
Authority: DE
Inventors: Hans Ehms Uwe 8500 Nurn berg Eckert
Original assignee: Grundig EMV Elektro Mechanische Versuchsanstalt Max Grundig, 8510 Furth
Publication date: 1971-10-14

Description

Die HrHtUlUiIg betrifft eine Vorrichtung zur Konstanthaltung des Bandzuges eines bandförmigen Tonträgers hei normallaufend und schnellaufeiul betriebenen Magnetionaufzeichnungs- und -wiedergabegeniten, hei denen in den Bandlauf zumindest ein Fühlhebel eingeschaltet ist, der bei Änderungen des Baiulzuges während des Nornialbetriebes (Aufnahme, Wiedergabe) zumindest in einer Baiidlaufrichtung eine am Ahwickelleller angreifende Bremse im Sinne der Konstanthaltung des Bandzuges betätigt.The HrHtUlUiIg relates to a device for keeping constant of the tape pull of a tape-shaped sound carrier hot normally running and fast-moving Magnetion recording and reproducing devices, called at least one in the tape run The feeler lever is switched on, which is activated in the event of changes to the construction phase during normal operation (recording, Playback) at least in one direction of travel a brake acting on the Ahwickelleller in the sense to keep the belt tension constant.

Die Bremse kann als Seilbremse, Bandbremse oder auch als Backenbremse ausgeführt sein. Das Grundbremsmoment wird durch jeweils einen Fühlhebel geregelt, wobei als Regelkriterium der Umschlingungswinkel des Fühlhebels dient, dessen Umschlingungswert sich je nach dem Wickeldurchmesser der Spule lindert und so durch Winkeländerungen der Kraftkomponente am Fühlhebel die z. B. ßremsseilspanliung beeinflußt. Hierdurch wird ein konstanter Band-ZUg über den gesamten Wickeldurchmesser erreicht. Diese über jeweils einen Fühlhebel gesteuerte Grundliremseinrichtung ist auch beim schnellen Umspulen luisreichend, sofern gleich große Brndspulen (z. B. zwei 15-cm-Spulen) für die aufwickelnde als auch abwickelnde Seite verwendet werden. In Funktion ist jedoch immer nur der auf der abwickelnden Seite befindliche Fühlhebel, der auf der aufwickelnden Seite vorgesehene Fühlhebel wird automatisch unwirksam gemacht.The brake can be designed as a rope brake, band brake or as a shoe brake. The basic braking torque is controlled by a feeler lever, with the wrap angle as the control criterion the feeler lever is used, the wrapping value of which depends on the winding diameter of the bobbin relieves and so the z. B. ßremsseilspanliung influenced. In this way, a constant tape-TOW is achieved over the entire winding diameter. This basic lirematic device is controlled by a feeler lever is also sufficient for fast rewinding, provided that the same size ignition coils (e.g. two 15 cm spools) for the winding and unwinding Side to be used. However, only the one on the unwinding side is in function The feeler lever located on the winding side is automatically ineffective did.

Hs sind Magnettonbandgerä;e bekannt, die eine über Fühlhebel gesteuerte Grundbreniiuing aufweisen, jedoch zur Vermeidung von Schlaufenbildungen den Hinweis in der Geräte-Beschreibung führen: »Es müssen möglichst gleich große Spulen-Kombinationen verwendet werden.« Diese Magnettonbandgeräte haben den Nachteil, daß bei Verwendung untertehiedlicher Spulen-Kombinationen (z.B. einer 18-tm-Spule und einer 13-cm-Spule) mit Schlaufcnbildungen zu rechnen ist. Werden gleiche Spulen-Kombinationen eingesetzt, so ergibt sich ein Brcnis-Schaltverhällnis von etwa 1 :2,5 (d. h. die Bremskraft an der Aufwickelspule muß den 2,5fachen Wert der bremskraft der aufwickelnden Spule besitzen); bei Verwendung unterschiedlicher Spulen-Kombinatiolien (z. B. einer 18-cm-Spule und einer 13-cm-Spulc) Wäre es erforderlich, das vorhandene Brems-Schaltverhältnis auf etwa 1 :6 zu erhöhen, um die gleiche Sicherheit zur Vermeidung von Schlaufenbildungen hei den vorerwähnten Spulen-Kombinationen zu erreichen. Magnetic tape recorders are known that have a basic burnout controlled by a feeler lever, however, to avoid the formation of loops, add the note in the device description: »Es If possible, coil combinations of the same size must be used. ”These magnetic tape recorders have the disadvantage that they are different when used Spool combinations (e.g. an 18 tm spool and a 13 cm spool) with loop formations is to be expected. If the same coil combinations are used, a Brcnis switching ratio results of about 1: 2.5 (i.e. the braking force on the take-up reel must be 2.5 times the have braking force of the winding spool); when using different coil combinations (e.g. an 18 cm spool and a 13 cm spool) Would it be necessary to use the existing brake switching ratio to about 1: 6 in order to ensure the same safety and avoid loop formation to achieve the aforementioned coil combinations.

Der Friindung liegt demzufolge die Aufgabe zugrunde, bei den in Rede stehenden Magnctlonhamltcräten die Sicherheit zur Vermeidung von Schlaufcnliildungen bei Verwendung ungleicher Spulenkombinationen mit einfachen Mitteln so zu steigern, dall die bei Verwendung ungleicher Spulcnkoinbinationen erreichte Sicherheit der bei Verwendung gleicher Spuleilkombinationen vorhandenen Sicherheit entspricht. The friction is therefore based on the task in the case of the magnetrons in question the safety of avoiding the formation of loops when using unequal coil combinations with simple means to increase so that the when using unequal winding combinations, the security achieved when using the same Spuleilkombinationen corresponds to existing security.

Diese Aufgabe wird bei einer Vorrichtung der eingangs näher bezeichneten Gattung erl'indungsgeitiiili (lurch eine IJremskfaflversliirkung der fühlhebelftesleucrlen Bremse derart gelöst, daü im Falle der Aufhebung einer Schnellauf-AnI ι iebsverbi ndiing (Schnellvorlauf bzw. Schnellrücklauf) die Bremskraft auf einen wesentlich über dem fühlhcbelgesteuerten li der Bremskraft liegenden Wert einstellbar ist.This task is carried out in the case of a device of the introduction Specified genus Erl'indungsgeitiiili (by means of a braking effect on the feeler levers The brake is released in such a way that, in the event that a high-speed operation is canceled, the operating connection is canceled (Fast forward or fast reverse) the braking force can be set to a value which is substantially above the feel-controlled li of the braking force.

Diesi criindungsgemäße Ausbildung bietet die weiteren Vorteile, daß bei der Aufhebung (Stoppen) von Schnellauf-Aniriebsverbindungen kürzere Bremszeiien und eine größere Sicherheit gegen Schlaufenhildungen bei Verwendung ungleicher Spulenkombinationen erreicht werden. Ferner arbeitet die erlindungsgemäüe Vorrichtung lageunabhängig, d. h., die vorgenannten Spulenkornbinationen können sowohl in waagerechter als auch in senkrechter Lage mit gleicher Sicherheit schlaufenfrei bei Beendigung desDiesi according to the training provides the further advantages that when canceling (stopping) high-speed Aniriebsverbindungen shorter braking times and greater security against loop formation when using unequal coil combinations can be achieved. Furthermore, works according to the invention Device independent of position, d. That is, the aforementioned coil combinations can both in a horizontal as well as in a vertical position with the same security without loops at the end of the

ίο Schnellaufbetriebes abgebremst werden, ohne daß bei jeder der möglichen Bet.-iebsarten der Bandzug des Tonbandes auf einen über der zulässigen Bandspannung liegenden Wert ansteigt.ίο can be braked in high-speed operation without the each of the possible operating modes the tape tension of the tape to one above the permissible tape tension lying value increases.

Im folgenden wird an Hand der Fi g. 1 bis 3 einIn the following, on the basis of Fi g. 1 to 3 a

Ausrührungsbeispiel der Erfindung unter Weglassung aller die erfindungsgemäße Vorrichtung nicht unmittelbar berührenden Teile beschrieben. Es zeigtAusrührungsbeispiel the invention omitting all the device according to the invention not directly contacting parts. It shows

F i g. 1 die neutrale Funktionsstellung, d. h. den Blick auf die im Zusammenhang mit der ErfindungF i g. 1 the neutral functional position, d. H. looking at those related to the invention

so wesentlichen Steuer- und Antriebsmittel eines Maguettonbandgerätes bei der Funktion »Halt« nach der Betriebsart »Start« (Normalbetrieb: »Aufnahme« bzw. »Wiedergabe«),so essential control and drive means of a magnetic tape recorder with the »Halt« function after the »Start« operating mode (normal mode: »Record« or »Playback«),

Fig. la den Schnitt A . . . B der F i g. 1,Fig. La the section A. . . B of FIG. 1,

F i g. 2 die Stellung der vorgenannten Teile bei der Betriebsart »Schnellrücklauf«,F i g. 2 the position of the aforementioned parts in the »fast reverse« operating mode,

F i g. 2 a den Schnitt C ... D der F i g. 2 und
Fig. 3 die Stellung der vorgenannten Teile bei der Stellung »Halt« nach vorherigem Schnellrücklauf-Betrieb. F i g. 2a the section C ... D of FIG. 2 and
3 shows the position of the aforementioned parts in the "stop" position after the previous rapid reverse operation.

In den Fig. 1 bis 3 symbolisieren die kleinen, zur Hälfte schwarz ausgefüllten Kreise verschiebbare Stifte und die bei zwei gegenüberliegenden Vierteln schwarz ausgefüllten Kreise unverschwenkbare WeI-len bzw. Achsen.In Figs. 1 to 3 symbolize the small, for Half of black circles filled with sliding pins and those at two opposite quarters circles filled with black, non-swiveling waves or axes.

Die dargestellten und nicht dargestellten Stcuer- und Antriebsmittel des in Rede stehenden Magnettonbangerätes sind in bekannter Weise ober- und untc'halb der nicht dargestellten Gehäuseabdeckplatte angeordnet und in einem nicht dargestellten Chassis gehaltert. Dabei sind die Detätigungsknöpfe für die wahlweise Einschaltung der verschiedenen Betriebsarten und die Wickelteller — wie bekannt — von außen zugänglich vorgesehen. Es dienen der Einschaltung der Betriebsart:The control and drive means of the magnetic sound device in question, which are shown and not shown are in a known manner above and below the housing cover plate, not shown arranged and supported in a chassis, not shown. There are the confirmation buttons for the optional activation of the various operating modes and the winding plates - as known - provided accessible from the outside. They are used to switch on the operating mode:

a) »Schnellrücklauf« die Drucktaste mit dem Betätigungsknopf R und dem Schieber 17,a) "Fast reverse" the pushbutton with the operating button R and the slide 17,

b) »Pause« (auch »Schncllstop« genannt, wobei bckannllich das normallaufende Band durch Abschwenken der Gummiandruckrollc von der Tonwclle stillgesetzt wird, während der Antriebsmotor und der Verstärker weiterhin eingeschaltet bleiben) die Drucktaste mit dem Betäti-b) »Pause« (also called »Schncllstop«, whereby bckannllich the normal running belt by swiveling the rubber pressure rollers away from the Tonwclle is stopped while the drive motor and the amplifier continue to be switched on stay) press the pushbutton

y gungsknopf /' und dem Schieber 18, y control button / 'and the slide 18,

c) »Start« die Drucktaste mit dem Betätigungsknopf .V und dem Schieber 19 und c) "Start" the pushbutton with the actuating button .V and the slider 19 and

el) »Schnellvorlauf« die Drucktaste mit dem Be-el) "Fast forward" press the button with the

tätigungsknopf K und dem Schieber 20.
60 button K and the slide 20.
60

Die vorgenannten Drucktasten sind entgegen der Kraft einer jeweils zugeordneten Druckfeder 27 bzw. 28 bzw. 2*) b/w. 30 aus der Ruhe- in die Arbeitsstellung zu schalten. Jede der Drucktasten, z. B. die Schnellriicklauftaste H, weist zwei seitliche Aussparungen (z. 11. 17', 17") im Schieber (z. B. 17) auf, durch die der betreffende Schieber in der jeweiligen Betriebsstellung durch Einfallen eines Vor-The aforementioned pushbuttons are counter to the force of a respective associated compression spring 27 or 28 or 2 *) b / w. 30 to switch from the rest to the working position. Each of the push buttons, e.g. B. the fast return button H, has two side recesses (z. 11. 17 ', 17 ") in the slide (e.g. 17), through which the slide in question in the respective operating position by falling a forward

Claims

ΪHinges (ζ. U. 21 ') of the razor bar 21 controlled by the “Ilalt” key (running ”) is moved towards its working position and in is mstet. When the "Hull" key is pressed, the latter is pressed into the latching recess by snapping in the latching projection 2Γ load rail 21 against the force of the spring 33 after the old-pocket slide 21. ₅ \ η " . When the slide 17

When the high-speed drive mechanism is switched on, the locking loop, which is raised in the Ilalu position, runs serving pushbuttons (K, K) are selek- flap 13 over the guide pin 22 until it is below live control means in the form of the left latching flap 13 of the latching flap 13 shown in FIG | between assigned to the right latching flap 14, which can emerge with way.

lcls two guide carriages 'or 14' in two io. With the movement of the slide 17, identical lugs 17 '″ of the fast reverse slide 17 are also hinge-controlled, not shown, between 20' ″ of the fast forward slide 20 , so z. B. the friction wheels for producing the idle are hung so that they are engaged laterally raised high-speed reverse drive connection. That can be. The bar springs 15 and 16 ensure that the "fast reverse" mode remains active only as long as the left detent 15 is pressed gently until the "Halt" pocket flap 13 is actuated on the guide lift 22 on the door slide (operating button Si ) the locking of the 11 or the right latching flap 14 on the locking rail 21 pushed to the left is released.

By the push buttons (K, V) for '.Ue Steue- The Fig. 3 shows the position of the invention

function of the Schneilauf Aniriebsvcrbinuungen associated control device after cancellation of the peten selective control means 13, 14 is in later fast reverse drive connection, i.e. H. after as described, the cross slide 11 is pressed in this way by pressing the »Halu button (control button .S '/) I above that in the case of the cancellation of a fast operating mode which was previously switched on running-auxiliary connection the assigned feeler lever 5 "fast return". The pushes on the sliding Zv. 6 can be controlled by the cross slide II. 35 bcr 17 resting latching flap 13 via its guide

In the case of the magnetic sound device in question, the control rail 11 serves approximately 13 "through the during normal operation of keeping the tape guide pin 22 constant, in the direction of arrow 34. Zugcs of the tape indicated by dash-dotted lines 26 During this sliding movement, the thigh comes three-armed feeler lever (z. B. 5), on one of which is a spring 10, which sits on the control rail 11, to the arm a feeler pin (e.g. 5 ') is seated, via which the pitch position is attached to the feeler pin 6' of the feeler lever 6 band 26 is out. This arm is under which the leg spring 10 is stretched and reinforced over the Tension of a tension spring (e.g. 7), through which the feeler lever 6 the tension and thus the brake-changer of the tape tension during the normal force of the brake cable 4 to a considerable extent accordingly, the area of the braking force controlled by the feeler lever at the assigned area winding plate (e.g. 1) engaging rope brake (e.g. 3) 35 value. This will do the required in a well-known way in the sense of keeping constant the braking switching ratio of the take-up reel 1 to the off-tape tension is operated. That reached in the assigned winding reel 2 of e.g. 1: 6 and one Brake cable attached to the arm of the feeler lever (e.g. 5) Formation of loops when using any coil (e.g. B. 3) is avoided with preferably 360 around the coil combinations.

carrier (e.g. 1) looped and on the other linde 40 When you press one of the pushbuttons again immovably hooked in. In a mirror image of the same as by moving the locking rail 21 over a side described Coil carrier 1 is the coil carrier 2 borrowed inclined surface 35 (Fig. La) on the Another Fühlhcbelanordnung with the drciarmi- locking lug 21 "raised the latching flap 13, whereby gene sensing lever 6 assigned, on one of which under the control rail 11 by the leg spring the tension of the tension spring 8 lever arm 45 back into its neutral functional position (Fig. I) the feeler pin 6 'is seated, over which the tape 26 is brought and a new operating mode is switched on is leading, and on the other hand another lever arm that can become.

After, as already mentioned, part of the comprehends the brake cable 4 guided over the coil carrier 2. About the third Fühlhcbelarm 5 "or 6" schriebenen control means in a mirror-inverted manner is seen center'B of the obm moved stop 27 '50, the mode of action when actuating the or 30' on the associated slide 17 or 20 of the pushbutton for the Operating mode »Schnndlvorlauf« (Bc-related quick-action button (K or V) the tactile button V) the same, only the lever-controlled brakes on the spool carrier of each part are interchanged. B. when moving the locking rail 21 over a sideline brake 3 of the winding side at the 55 borrowed inclined surface (corresponding to the "fast reverse" mode (F i and 2). Surface 35 on the locking lug 21 ") on the locking lug

Fig. I shows the neutral functional position 21 "" of the locking rail 21, the RaMklappc 14 for the purpose of the crlinduiigsgemäße device, ie the radio reset of the control rail 11 raised. tion »Halt« after the operating mode »Start« (normal _p ...

operation). The control rail 11 is spaced apart by the 60.

against their bent lobes W. I. Device for keeping the ligament constant

both limbs of the immovably geiagcilcn features, "a tape-shaped sound carrier with normal-

Kelfeder 12 held in their zero lie. The continuously and rapidly operated magnetic

other Steiiernittcl are - as from the sound recording and playback devices

Fig. I can be seen - in their neutral function 65 which in the tape run at least one sensing lever position. is switched on, which is activated when the band

If according to FIG. 2 by pressing the pull during normal operation (recording,

Actuation button Ii the operating mode »Scramble return playback) at least in one direction of tape travel

a brake acting on the unwinding plate is actuated in the sense of keeping the tape tension constant , characterized by a braking force amplification of the lever-operated brake (4) in such a way that, in the event of a high-speed drive connection (fast forward or fast reverse), the braking force is reduced to a range significantly above the feeler-controlled area the braking force is set.

2. Apparatus according to claim 1, characterized in that the adjustment of the braking force to a value of the f-'ühlhcbcl (6) which is substantially above the range of the braking force is used, which is controlled by a mechanical control means (10, 11) Can be swiveled , which can be adjusted by selective control means (13, 22) assigned to the previously switched on high-speed operating element (Ä, 17).

3. Device according to spoke 2, characterized in that the switching on of the various modes of operation are used in a known manner by pushbuttons , the slide (17) of which in the switching position is controlled by a rail (21, TY) that can be controlled by the HalU-Tastc ) can be locked and only the pushbuttons used to switch on the high-speed drive connections are assigned the selective control means (13, 22), by means of which a transversely to the slides (17 to 20) of the pushbuttons, the setting of the higher braking force Via the associated feeler lever (6) serving .Slider (11) can be controlled.

4. Apparatus according to claim 3, characterized in that that the Aufwickclteller (1) and the unwinding plate (2) the feeler-controlled Brakes (3 or 4) and selective control means (13.22 and 14.23) mirror images symmetrically are assigned in such a way that even when the one fast-running drive connection is canceled oppositely operated high-speed drive connection the braking force of the now as Unwinding plate working plate associated brake through the cross slide on the substantially is set above the associated feeler-controlled range of the braking force will.

5. Apparatus according to claim 4, characterized by an immovably mounted two-legged Spring (12), through each of which one associated leg of the transverse slide (11) a .'tvutralen center position (Fig. 1) in the Control of the associated sensing lever serving active position (3) can be deflected.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings