DE2340262C3 - Recording and / or playback device for a tape-shaped recording medium with a reel plate arrangement - Google Patents

Description

The invention relates to a recording and / or reproducing device for a tape-shaped recording medium with a reel table arrangement comprising a reel table main body for receiving a reel, a first coupling part arranged under the reel table main body, a shaft to which the reel table main body and the first coupling part are connected in a rotationally fixed manner , a drivable second coupling part arranged axially displaceably and separately rotatably on the shaft under the first coupling part, a first friction part arranged between the first and the second coupling part for transmitting a torque between the first and the second coupling part, one under the second coupling part on the Shaft axially displaceably arranged pressing part, and a second friction part arranged between the second coupling part and the pressing part, the pressing part serving to press the friction parts together between the adjacent parts.

From DT-Gbm 18 20 552 there is a magnetic tape recorder with a slip clutch provided in the winding plate known in the manner of the reel plate arrangement described above. In this known slip clutch a, the reel disc main body corresponding winding mandrel has a widened foot part that the first Represents coupling part. On the shaft firmly inserted in the winding mandrel are widened following the Foot part successively a felt disk representing the first friction part and a second coupling part Representing clutch disc and a diaphragm-like spring corresponding to the pressure part are threaded. Between the diaphragm-like spring and the clutch disc there is a second friction part corresponding felt ring. The parts pushed onto the shaft are turned into a recess on the The spring washer pushed onto the lower end of the shaft is held in place. The function of this slip clutch consists in switching to high-speed operation from the driven clutch disc via the Felt washer to limit the torque transmitted to the winding mandrel. The one between the membranous Pressure spring and the clutch disc located

Felt ring should occur when there is a relative rotary movement between the pressure spring and the clutch disc avoid the occurrence of scratching noises that would otherwise occur when the pressure spring on the Clutch disc would occur.

In devices for magnetic recording and / or playback of video signals, it is necessary to communicate an extremely high torque to the take-up reel in the tape winding direction. This is because that in such devices, a wide, ₀ magnetic tape is used, which passes through a complicated path, on which it wraps around a guide drum with magnetic heads at a certain angle, which rotate at high speed. The usual reel plate arrangements of the type described above are not suitable for transmitting such high torques.

For the state of the art, reference is also made to the publication “Funkschau”, 1969, Issue 8, Page 641, Figure 3. From this publication a weight-dependent winding clutch for a magnetic tape drive is known in which a drivable clutch disc is pressed against the reel disc by means of a leaf spring in a manner similar to the arrangement already described. This known construction is also unsuitable for the transmission of larger torques. In addition, it has the disadvantage that the fixed to the shaft of the hub plate spring bears directly against the clutch disc, so that during operation undesirable ^ ₀ scratch noises during a relative movement between the clutch disc and the plate spring may occur.

The invention is based on the object of the reel plate arrangement of a receiving and or or To design playback device for a tape-shaped recording medium such that they high Can transmit torques, such as occur for example in magnetic tape recorders for video signals.

To achieve this object, the device according to the invention described at the outset is characterized characterized in that a third located between the pressing part and the second friction part with the Shaft non-rotatably connected coupling part is provided, with the transmission of the rotary movement Drive device on the reel plate main body, the second coupling part, the first friction part and the first clutch part a first torque transmission path and the second clutch part, the second Friction part, the third coupling part and the shaft form a second torque transmission path and the rotational movement of the drive device simultaneously via the first and second torque transmission paths is transferable to the spool main body.

The subject matter of the invention offers the advantage that for the transmission of the torque from the drive device two parallel torque transmission paths, each with a friction part, on the spool main body are provided so that the total torque to be transmitted is divided between two friction parts will. As a result of the correspondingly divided braking force, there is therefore one in the two friction parts comparatively less heat development than with a reel plate arrangement with a single torque transmission path. Furthermore, in view of the two torque transmission paths, the Friction parts and the coupling parts acting pressure force compared to an arrangement with a single torque transmission path can be reduced. In addition, the arrangement is such taken that it is between the third coupling part rotatably connected to the shaft and the im general pressure part formed by a spring does not come to any relative rotational movement. Through this scratch noises are avoided from the outset, which could otherwise be caused by grinding movements would occur between the pressing part or the spring and other parts.

A preferred development of the invention is characterized in that between the second Coupling part and the second friction part, a fourth coupling part axially displaceable on the shaft and relative to the shaft and the second coupling part is arranged separately rotatable and that one Coupling device is provided, which in the engaged state, the fourth and the second clutch part for Execution of a common rotary movement couples with each other and in the disengaged state these both coupling parts decoupled from each other, whereby the second coupling part, the coupling device, the fourth coupling part, the second friction part, the third coupling part and the shaft the second Form the torque transmission path and thus the rotary drive of the drive device when engaged Clutch device on the first and the second torque transmission path simultaneously on the Spool plate main body and only via the first torque transmission path when the clutch device is disengaged is transmitted to the reel disc main body with a smaller torque.

With such an arrangement it is possible to have either a high torque or a low torque in the tape winding direction on the reel disc main body. This offers advantages in the With regard to the application in portable or stationary devices with different cassettes. Preferably, means are also provided in the device according to the invention, which are able to determine the type of cassette used and select a suitable torque based on this determination, which then acts on the take-up reel plate of this particular type of cassette.

A preferred embodiment of the invention is described with reference to figures. It shows

F i g. 1 is a plan view of a recording / playback device with an improved reel table arrangement; before inserting a tape,

FIG. 2 is a plan view of the one shown in FIG Device after inserting a tape,

3 shows a vertical section through the device along the line 111-111 drawn in FIG. 1,

F i g. 4 shows a partially sectioned vertical view of an embodiment of a reel plate arrangement; which is built into the device shown in Fig. 1 and represents an essential part of the device,

F i g. 5 and 6 are a partially sectioned vertical view and a plan view of another embodiment a reel plate assembly and

FIG. 7 is a sectional view along the line shown in FIG. 5 drawn line VIl-VII.

To explain the invention, the loading and unloading are first of all with reference to FIGS. 1 to 3 by way of example Unloading processes of the tape in a recording and / or playback device described in which the Insertion of the tape or the tape loading process is carried out automatically and one after

of the invention formed reel plate assembly represents an important component.

A tape cartridge 10 includes a tape supply reel or supply reel 11 and a tape take-up reel 12. Furthermore, tape guide pins 13, 14 and 15 are provided in the cassette 10. One from tape supply reel 11 Unwound magnetic tape 16 is guided by the pin 13, runs on the front surface of the cassette and passes between the pins 14 and 15 to the tape take-up reel 12. The cassette 10 is on its front or innermost surface and on its bottom surface with a cut out Opening 17 is provided, which has a diaphragm cover, not shown, which when the Cassette in the device, so in the charging state, is opened and the arranged in the cassette Magnetic tape 16 protects when the cassette is not in use. If the cassette is in the one shown in FIG is in the state shown, that is to say on a winding reel plate 19 and a take-up reel plate 18 is arranged, the diaphragm cover is held in the open state, and a clamping pin 20 and a Feeling pins 21 engage in the cassette opening 17. The supply or take-off reel plate 19 has a structure known per se in which a reel disc main body 23 is interposed with a Friction material is attached to the top surface of the reel table assembly. The take-up reel plate 18 represents an essential part of the device formed according to the invention and has an in the F i g. 4 structure shown, in which the rotational movement of a second coupling part 117, which is from a Drive roller 43 is driven via various power transmission paths with a clutch mechanism is transmitted to a reel table main body 22, in the form of a rotational movement in the sense the winding direction. In the case of the FIG. 1 shown In the state of the devices, the two reel plates 18 and 19 are in a free path Condition.

First, the loading process will be described during playback or video-audio recording occurs. For playback, a playback lever 24 is shifted to the right or viewed from above in Counterclockwise / counterclockwise rotated, namely into the locking position shown in FIG. For Vicleo audio recording c a Vidco audio recording button 106c is pressed and the set lever is pressed at the same time 24 moved in the same way as when playing.

By operating the control or adjustment lever 24, a link 25 is similarly threatened counterclockwise. This is against the Force of a spring 30, a locking lever 28 rotated clockwise. The locking lever 28 is via a Connecting rod 29 is connected to the connecting link 25 and is rotatable in a bracket 27 attached, which is attached to a chassis part 26. The consequence of this is that on the tape supply or Unwinding kit on the lower side of the bracket

27 rotatably mounted clamping lever 31 is released from engagement by an engaging pin 32 which is inserted into the lower side of the other end of the Spcrrhcbels

28 is firmly embedded, and thereby by the force of a spring 34, which is between the clamping lever 31 and a Schrügstcucrhebel 33 extends, clockwise is rotated,

Due to this rotational movement of the tensioning lever 31, the into the other end of the tensioning lever 31 inserted clamping spigots 20 are moved out of the interior of the cassette 10 via the opening 17. At this Movement out, the clamping spigot 20 detects the magnetic tape 16 and pulls it out of the cassette, Furthermore, by the rotary movement of the tensioning lever 31, a brake band 37, which surrounds the reel plate 19! and at one end to a pin 35 inserted into the lever 31 and at its other end an attached to the chassis part 26 fastening member 36 is attached, tensioned, whereby on the Take-up reel plate 19, a braking force is applied to the unwound from the tape reel 11 Magnetic tape 16 to communicate a back force. The helical control lever 33 is operated with the aid of a button 38 operated and locked in a special position.

Furthermore, by the rotary movement of the playback control lever 24, an electrical circuit is included a belt drive roller motor 40 and a head motor 41 closed. The motors 40 and 41 are therefore turned on and begin to spin. The rotation of the motor 40 is not about a Belt shown transferred to drive a clockwise Zwischenrollc 42, the integral Construction is provided with a two-stage roller and around a further belt, not shown drive a drive roller 43 and a rewind roller 44 which are integrally arranged and a flywheel 46 which is connected to a balance drive roller 45. Furthermore, to this Time the drive roller 43 in contact with the second coupling part 117 of the take-up reel disc 18 brought, and the reel disc main body 22 is a relatively high torque in the tape drive · winding direction communicated.

The rotation of the head motor 41 is transmitted through a pulley 47, a belt 48 and a pulley 49 to rotate an upper guide drum 50,1 of a guide drum 50 clockwise at high speed. As can be seen from FIG. 3 , the guide drum 50 also includes a lower guide drum 506 which is attached to the chassis 51 of the device. The upper guide drum 50 "is with a rotating

Is equipped with a video head (not shown) and rotatably mounted at a small distance from the lower guide drum 50b and inclined in such a way that the drum part opposite an erase head 102 occupies a low position.

In addition, the movement of the playback stick 24 turns off a in its The state of the rotary drive mechanism (not shown) is brought into the state of charge and unites Drive roller 52, which against the inner circumference of a

Circular ring 58 is pressed. becomes a rotary motion

communicated clockwise. Then it begins

Circumferential ring 58 clockwise uus its in the F i g, I.

to rotate the position shown.

The circumferential ring 58 is under a special one

do angle of inclination relative to the chassis 51 held rotatably by guide rollers 70a, 70b and 70c. The circumferential ring 58 is provided at special points on its outer edge with V-shaped notches 71 and 72 and a U-shaped cutout 74 and is

fts to a position with regard to its rotational movement limited, in which a roller 75 fits into the notch 71. A first arm 76 and a second arm 77 are rotatably connected to a shaft 78. The obvious-

de part of the first arm 76 is rotatably mounted on a pin 80 which is firmly embedded in a support part 79 which is shown in FIG the side view according to Figure 3, the circumferential ring 58 intersects. The second arm 77 carries the guide pin 21 fixedly embedded in the upper part of the distal end and a pin 18 fixedly inserted into the lower side of this end is let in. The pin 81 extends into a position that engages it in the cutout 74 can be engaged, and the pin 81 is guided by an arcuate guide surface 79a of the support member 79 prevented from disengaging from the cutout 74.

The rotating ring 58 is provided with guide pins 82a on its upper surface. 82b and 82c and a hinge pin 83, which are firmly inserted into the circumferential ring. A pinch roller support lever 84 is hinged to pivot pin 83 and is caused to rotate counterclockwise by a torsion spring. The lever 84 is, however, in the FIG. 1 prevented from rotating. At its distal end, the lever 84 is provided with a tape guide pin 85 and approximately in its middle part with a clamping roller 86.

When the rotating ring 58 begins to rotate, an approximately L-shaped lever 87, at one end thereof the roller 75 carries, rotated against the force of a spring 88 clockwise, so that the roller 75 from the Notch 71 disengages and presses against the outer peripheral surface of the rotating ring 58.

The fitted in the cutout 74 pin 81 rotates together with the ring 58 when this from the guide surface 79a is guided. The consequence of this is that the first lever 76 with respect to the pin 80 in the Is rotated counterclockwise while the second arm 77 with respect to the shaft 78 one rotation in Clockwise. When the circumferential ring 58 continues to rotate, the lower section of the from the guide surface 79.Ί guided pin 81 over an opening in an arcuate slot 89, the hoof ring 58 is provided in chassis 51 along the outer edge. The pin 81 will now led by the Scitenwändcn of the slot 89 to itself to rotate together with the ring 58, but at a distance from the guide surface 79 ″.

If, as the circumferential ring 58 continues to rotate, the cutout 74 shows one in the FIG. 1 with a double-dotted line Reached position marked by a broken line, the pin 81 is curved by a Slot cut 89 ″ of the arcuate slot 89 with respect to the circumferential ring 58 in the radial direction guided outside, the pin 81 moves out of the open end of the cutout 74 and fits against the Force of a torsion spring 90 in the inner part of the curved Schlitzabschnitts 89 ″. If the If the ring 58 is rotated a little further with respect to the position described above, the pin 81 has the Cutout 74 completely left and is by the torsion spring 90 against the ttußcrcn peripheral edge of the Ring 58 is pressed and is locked in the curved distance 89 '. During the second Half of the rotational movement of the Utnluu ring 58 The first arm 76 is rotated clockwise into the position indicated above, while the second arm 77 is rotated clockwise a counterclockwise rotation and into the position shown in FIG. 1 with a double dotted line broken line drawn lie is broken.

The two arms 76 and 77 are interrelated with the above-described rotation of the annular ring 58 with respect to the pin 80 in the Rotated clockwise as they change their folded state. When the one on top of the at the distal end of the second arm 77 from the opening 17 of the Cassette 10 is moved out, it grips the magnetic tape 16 over its entire width and pulls the tape in the horizontal direction out of the cassette when the rotating ring 58 rotates clockwise. Once the pen 81 trapped in the curved slot portion 89a

ίο, a magnetic tape loop 16a with an approximately triangular shape has formed in the plane of the cassette 10, as shown in FIG. 1 by a double-dotted broken line.

The rotating ring 58 then continues to rotate.

Since the circumferential ring 58 has such an inclination that in its lowermost position it lies opposite the underside of the cassette 10, as shown in FIG. 3, the tape guide pin 85, pinch roller 86, guide pins 82a, 82i> and 82c and similar other parts enter the triangular magnetic tape loop 16a from below and rise as the ring 58 rotates. Therefore, when the leading tape guide pin 85 emerges from the magnetic tape loop 16a formed up to that point, it takes the magnetic tape 16 with it and guides it around the cylindrical edge surface of the guide drum 50 as the rotating ring 58 continues to rotate.

When the rotating ring 58 with the help of the belt guide pin 85 the magnetic tape 16 in the manner described above so far around the outer peripheral surface of the Guide drum 50 has pulled until the in the F i g. 2 is almost reached, the Umlaufringantriebsmcchanismus brought from its state of charge to the switched-off state when a Part of the mechanism with an unillustrated protrusion in the lower surface of the ring 58 in FIG Touch comes. Then the drive roller 52 stops rotating, and the revolving ring 58 stops similarly with its clockwise directional rotation.

The rotating ring 58, which is no longer driven, takes the position shown in FIG. 2, in which the roller 75, which presses against the outer circumferential surface of the circumferential ring, engages in the notch 72. When the ring 58 has rotated into its end position, a microswitch, not shown, is closed, which causes the Gerill to be switched to the recording or playback mode. Furthermore, a lifting magnet (not shown) is actuated in order to turn a Klcmmrollcndruekhebcl 95 clockwise so that the pinch roller 86 is gripped by the Klcmmrollewellc 91 and rotates together with the support lever 84, with the result that the magnetic tape 16 against the capstan or Bandaniriebsrolle 45 is pressed, As a result, the magnetic tape 16 is clamped between the clamping roller 86 and the already rotating Bandantricbsrollc 45, so that the magnetic tape begins to feed.
Furthermore, as a result of the rotational movement of the

(, 0 Druckhcbcls 95 in its above uncgcbcnc operating position a locking element is moved to the left via a rod (not shown) in order to release a winding spinning lever 97. As a result, the tensioning lever 97 rotates slightly counterclockwise against the force

ds a spring 99 in accordance with the Mugnet waist tension, felt by a spun pluck 98 which is firmly embedded in one end of the clamping lever 97. At the same time one end pushes around

7 (1 (1 IiSI mil

ΐ ^, ί

of the tensioning lever 97 mounted brake shoe 100 against a first reel plate part 116 of the take-up reel 18, with the result that a control process relating to the tape tension begins on the take-up side.

When the device is in the recording or playback mode, the magnetic tape 16 guided by the guide pin 13 and unwound from the tape supply reel 11 in the cassette 10 is held on the unwinding side by the tensioning pin 20 at a constant tape tension. The cocking, ₀ pin 20 cooperates with a brake band 37th Furthermore, the magnetic tape is guided by a guide pin 101 and pulled over the erase head 102, which, in the event of a recording, carries out a complete erasure over the entire tape width. The magnetic tape then rotates in a helical manner around the circumferential surface of the guide drum 50, specifically over a certain angular range, the limits of which are defined by guide pins 103 and 104. The recording or reproduction of video signals is carried out via a video head (not shown). Furthermore, the tape is drawn over an inclined head 105 which takes on the recording or reproduction of audio and control signals. Behind the head 105, the magnetic tape is driven by the tape drive roller 45, against which it is pressed by the pinch roller 86. In the case of the tape guide pin 85, the direction of advance of the tape is reversed. The magnetic tape then runs over the opposite side of the clamping roller yo 86 and over the guide pins 82; i. 82b and 82c. Behind the locked guide pin 21, the magnetic tape on the take-up side is kept at a constant tape tension by the tensioning pin 98 when the tape re-enters the cassette 10. In the 3 "cassette, the tape is guided by the guide pin 14 before it reaches the take-up reel 12, which is given a torque in the tape deflection device.

The Banduniladevorgang is triggered in the above ^ device by a Abschaltsieuerung. At the time of shutdown, a shutdown button 106 /) is pressed, whereupon a lifting magnet 107 is actuated and the final control lever 24 is released from its locked position and returned to its original position shown in FIG. As a result of the backward movement of the control lever 24, the various devices which are in operation during the loading process come into operation in such a way that they can be operated one after the other in one with the _? The reverse temporal sequence related to the process returns to its original position, so that the device 1 returns from the state shown in FIG. 2 to the state shown in FIG completely withdrawn into the cassette, and the device goes into the switched-off state,

On the front face of the device, from the right and left, there is a shuffle feed control button 106 «, the close control button 106 / j, the Vidco audio record control button 106c and an audio detonator button 106t / disordered.

Next, I! And the Fig. 4 a preferred one Embodiment of a Spulencllcrunordnuug described which an essential part of the invention represents. The construction and operation of the take-up plate 18 is started, The Take-up plate 18 includes a spool shaft 110 which is fixedly inserted in the chassis 51, and on this shaft 110 arranged spool plate parts.

The spool main body 22 is fixedly attached to the upper part of a cylindrical bearing sleeve 111 which is rotatably arranged on the spool shaft 110. There are Means are provided to prevent the main body from disengaging from the top of the shaft 110. Arn On the upper part of the reel table main body 22, an elastic protrusion 112 is attached. An engagement pin 113 is pressed upwards by a helical spring 115, the lower end of which is attached to a plate 114 which is fixedly attached to the lower surface of the main body 22. The engagement pin 113 thus protrudes a certain distance beyond the upper surface of the reel table main body 22. The elastic one Protrusion 112 and engagement pin 113 are inserted into the center hole of the take-up spool, one in the take-up / Playback device inserted cassette 10 inserted. In this way, the reel table main body 22 and the take-up reel are coupled together.

A first coupling part 116 is disk-shaped formed and fastened coaxially to the bearing sleeve 111. The part 116 thus rotates simultaneously with the reel disc main body 22, that is to say with the bearing sleeve Ul. The coupling part 116 is on its outer periphery surrounded by the brake shoe 100 which is attached to the take-up tension lever 97 and the ο the circumferential surface of the coupling part 116 is opposite.

The second coupling part 117 is coaxial under the arranged first coupling part 116 and has a relatively long Lagcrabschnitt which is free »5 is rotatably and displaceably arranged on the bearing sleeve IM. The drive roller 43 is the outer Opposite the circumferential surface of the second coupling part 117. Furthermore, there is a first Frikiionteil 118 between the Kuppiungsieilen 116 and 117, the one has an annular shape and is made of felt. DOS Coupling part 117 is under an upwardly directed prestress, which is created by a spring 121 will produce.

The restriction piece 118 can be glued to the coupling part 117 or else simply clamped between the two coupling parts 116 and 117. In the latter case, the friction surfaces are designed such that the coefficient of friction between the upper surface of the friction part 118 and the surface of the coupling part 116 is greater than that between the lower surface of the friction part 118 and the surface of the coupling part 117. As a result, a sliding movement occurs between the coupling part 117 and the friction part 118 ss if the coupling part M 7 is rotating? Coupling part 116 transfers,

Hin third coupling part 119 is under the second Coupling part 117 disordered and is so on tlei Bearing sleeve 111 attached, because it is together with clei on bearing sleeve 111 rotates, but tire in the axial direction is displaceable, A second ring-shaped Frlioiislei 120 is between the three coupling part 119 and the second coupling part 117 is arranged. The coupling part 119 is held against din by the spring 121 ds coupling part 117 pressed. The Frlkllonsbcrülmings surfaces are designed such that the coefficient of friction ciently between the friction cable 120 and the rest surface of the coupling part 117 «roller al:

between the friction part 120 and the contact surface of the coupling part 119. As a result occurs between the coupling part Π9 and the friction part 120 a sliding movement when the coupling part 117 transmits a rotary movement to the coupling part 119.

The spring body 121 is secured on its lower surface in the central area by a stop 122 held, which is attached to the bearing sleeve 111. The spring body 121 has several arms which extend from the Middle part extend radially outwards and are bent upwards. The outer ends of these spring arms contact the lower surface of the coupling part 119. Accordingly, the third coupling part 119 and second coupling part 117, which is on the bearing sleeve 111 are axially displaceable, subjected to an axially acting force which these coupling parts 119 and 117 against the first coupling part 116 presses, which is not slidable. The two friction parts 118 and 120 are thus between the coupling parts adjoining them trapped. At the lower portion of the bearing sleeve Ul, a roller 123 is fixedly attached, the serves to drive a counting mechanism.

Next, the operation of the take-up reel disc 18 having the above structure will be described in the case where the recording / reproducing apparatus is to be operated for recording or reproduction. When the device is switched to the recording or reproducing mode, the rotating drive roller 43 is pressed against the outer peripheral surface of the coupling part 117 to impart a torque to this part in the tape winding direction. This torque is not transmitted directly to the bearing sleeve U1, but is first transmitted to the first coupling part 116 via the first friction part 118 and to the third coupling part 119 via the second friction part 120. Since the coupling parts 11b and 119 rotate together with the bearing sleeve 111, which can form an integral component with the spherical shell body 22, they overlap. _(l) the torques communicated to the coupling lines HH and 119 and are transmitted to the reel plate main body 22 via the bearing sleeve Hl.

This is communicated to the second coupling part 117 by the drive roller 43 pressed against it Torque simultaneously over one torque transmission path with dom coupling part 117, the l'riction part 118, the coupling part Hb and the Player main body 22 and for a while Torque transmission wcg with your coupling part see below 117, dom Friktionstoil 120, the coupling part 119, the l.agerhülso Il I and dom Spuloiuellerhuuptkbodycr 22 to dom Sptilentellor main body 22 transferred.

Since the first and the second Drchmomont overflow giingswcg purullel to each other, one can dom ^ Coil body main body 22 is relatively high Communicate torque, even if the anilnial force the coupling against the friction part IIK and 120 Relatively small words. You the pressure force between the friction parts and the coupling <w parts are therefore small, it is possible to reduce the heat generated by friction in the Gleiloborfluchen to be kept low. As a result, the wear is in the these surfaces low,

Furthermore, the reel disc 18 described is there («, designed so that the third coupling part 119 and the counterpressure FoderkOrpci ¹ 121 rotate together with the sleeve 111

conventional reel plate arrangements conventional undesirable phenomena avoided, for example Wear on the spring body and on the coupling parts, noise generation and changes in the Spring force at a speed difference between the spring body and the one with the spring body in Touching the coupling part.

It is thus possible to have a relatively high torque without fluctuations over a longer period of time to be transferred to the reel disc main body 22.

In the case of the FIG. 4 shown tape supply reel plate or supply reel table 19 are parts which have the same function as similar parts of the take-up reel table 18 have been given the same reference numbers, but with a superscript Have line index. For the sake of simplicity, these parts are not described in detail. A first Coupling part 125 and a second coupling part 126 are designed such that they are together with the Turn bearing sleeve H Γ. To see the exterior of the The brake band 37 is guided through the first coupling part 125. A rewinding roller 44 is provided opposite the peripheral edge of the second coupling part 126.

When in the recording / reproducing apparatus in the switched-off state of FIG. 1, a rewinding operation is triggered, the rewind roller 44 is pressed against the second clutch part 126, which is then in the tape winding direction is rotated. The rotary movement of the coupling part 126 is via the 1st bearing sleeve IH 'on the reel disc main body 21 transfer. The rewinding operation is carried out when the tape 16 is completely inserted into the cassette IO is withdrawn.

A cassette 10 of the type described, which is used in connection with stationary devices, oni includes two built-in coils, each with top and lower coil side walls are equipped with different diameters. A workstool sirap. e.g. Teflon, is within the inner wall surface of the cassette housing is provided, which is opposite to the side wound with the smaller diameter. A cash box to be described which is used in conjunction with an irretrievable device. L'iithüll when installed two coils, each are equipped with upper and lower coil walls of the same diameter.

For this reason, with regard to the tape winding direction of the take-up reel, it is in the Clear cassette 10 of a stationary device Torque important, the orchmomeiu losses as a result Consider friction between the strip and the tape reel separately. One must therefore the Aul'wickel reel of the cassette 10 of a stationary device eil Tell the torque to be as specified above! Drolinioinentvei'luste greater than that on the Aul'wickel reel of a cassette for a portable phone no torque is. This loss of torque has / ι the beginning of the rotary movement of a hand winding voi The maximum diameter is of the order of about 450 g / cm and also depends on the size of the tape wrap *.

For this reason, it is desirable for a recording to be played back at will both types of cassettes 10 and 154 are to be operated, one dull in accordance with di inserted cassette tape to the take-up reel iclli averages a variable torque.

With a conventional recording / playback device, however, both types of cassette can be used at will can be used, the same torque that is suitable for a cassette for a portable device is transferred to the upper reel plate part of the take-up reel plate, regardless of which Is in use. Therefore, if a cassette suitable for a stationary device is in the above described device is used, and a recording or playback is to be carried out, occur in the ι ο tape lap formed on the take-up reel has irregularities.

An embodiment of a reel plate arrangement is described with reference to FIGS. 5, 6 and 7, in which the problems mentioned have been overcome. Here are parts that are similar to parts of FIG. 1, with given the same reference numerals. In addition, for the sake of simplicity, a description of this is given Parts omitted.

The cassette 10 is a cassette intended for the stationary device with a Magnetic tape with a playing time of 60 minutes. The cartridge will not be in a special location Cassette mounting plate shown, with one in the lower surface of the cassette 10 formed guide groove 10a receives a pin 130 which is firmly inserted into the mounting plate.

First, the structure and operation of the reel plate assembly on the take-up side described. A take-up reel plate 18 'has different types of reel plate parts, which with a Cooperation spool shaft 131, which is firmly inserted into the chassis 51. A first coupling part 132 is attached coaxially to the upper part of a bearing sleeve 133 which is rotatably arranged on the spool shaft 131. The Coupling part 132 includes the reel table main body 22 and a disk-like portion 132a which the Brake 100 of a tension control mechanism is opposite. The coupling part 132 is with the help of a Screw 134 prevented from coming off the spool shaft 131, and is equipped with an engaging pin, protruding from the top surface in a manner similar to that already described Embodiment of the reel plate arrangement.

A second coupling part 135 is provided with a relatively long bearing portion, the the bearing sleeve 133 rotatably and slidably surrounds. The coupling part 135 has an outer periphery with a Drive surface 135a against which the drive roller 43 is pressed in the manner described above becomes, and includes a toothed portion 1356, the diameter of which is less than is that of the drive surface 135a. Between the first and second coupling parts 132 and 135 there is an annular friction part 136 made of felt. The coefficient of friction between this friction part 136 and the two coupling parts 132 and 135 are chosen such that between the coupling part 135 and the friction part 136 there is a sliding movement occurs when rotational movement is transmitted from the coupling part 135 to the coupling part 132. Out for this reason, there becomes a phenomenon that the coefficient of friction between the coupling part 135 and the friction part 136 changes depending on the adhesive used for the case avoided, f> 5 that one friction part 136 with an adhesive to the Coupling part 132 is glued on.

A fourth coupling part 137 is rotatably and slidably fitted on the bearing sleeve 133 in a manner similar to the second coupling part, and is urged upward by a spring body 141 in a manner to be described later. The upward movement is limited in that the fourth coupling part 137 with its stop section 137a touches the stop section 135c of the coupling part 135. The coupling part 137 is provided at its outer periphery with a toothed portion 137 b having the same diameter and the same tooth module as the tooth portion 135b. If a cassette 10 with a large size is inserted in the device, the rotational movement of the coupling part 135 is forcibly transmitted to the coupling part 137 by means of a gear 138 which meshes with the tooth portions 135b and 1376 at the same time. The second coupling part 135 and the fourth coupling part 137 correspond in the event that they rotate together, the second coupling part 117 of the take-up reel disc 18 of the first embodiment described.

A third coupling part 139 is in accordance with the illustration according to FIG. 7 into a cut away Section fitted in one piece of the side surface of the bearing sleeve 133 so that the coupling part 139 rotates together with the bearing sleeve, but is axially displaceable with respect to it. The coupling part 139 is pushed up by the spring body 141, and between the coupling parts 137 and 139 is a annular friction part 140 clamped. When the rotary movement of the fourth coupling part 137 via the Friction part 140 is transferred to the third coupling part 139, occurs between the pressure surfaces of the coupling part 139 and the friction part 140 have a sliding movement.

The spring body 141 is of such a shape that protrude from a hub-shaped center part of arms 141a, 141b and 141cradial outward. The middle part is rotatably arranged on the bearing sleeve 133 via a wheel 142. The wheel 142 is attached to the lower portion of the bearing sleeve 133 and is used to drive a counter. The outer ends of the arms 141 a, 141 b and 141 c of the spring body 141 are respectively in contact with stepped portions of the same height of stepped projections 139a, 1396 and 139c, each provided with a different number of steps, which are at equal angular intervals on the lower Surface of the lowermost coupling part 139 are formed. The upwardly pushed third coupling part 139, fourth coupling part 137 and second coupling part 135 are limited in their upward movement at a certain height by the first coupling part 132.

Next, a sensing mechanism will be described, which is arranged in the vicinity of the take-up reel disc 18 to determine what type of cassette ir the device has been used. A lever 144 to determine the type of cassette has accordingly de Representation according to FIG. 5 an L-shaped shape un <a bent flange-like approach, the un a pin 145 is pivotable. When there is no cassette 10 on the cassette mounting plate det, a screw 146 screwed into the outer end of one arm of the lever 144 is controlled by a Lever 147 touches, and the lever 144 is accordingly as shown in FIG. 5 clockwise rotated so that a channel-shaped sensing part 144a ar the outer end of the other end of the lever through a

ΛΓΓηυηβ in the cassette mounting plate to the outside The sensing part 144a is located in such a manner that it is close to the lower surface one end of a cassette 10, which is intended for a stationary device, is touched, 5

The rotatable lever 147 is rotated at its base portion about a pin 148 and can be rotated counterclockwise by a spring 150 which extends from a lever 149 in accordance with the slope according to FIG. 6. The rotary movement of the ₁₀ μ lever 147 is limited at a point at which it has turned counterclockwise so far that the screw 146 touches the sideways bent part in a position distant from 15 5Tn tooth sections 135b and 137b, but overlying ρ '. The pin 151 is fixedly inserted in one end portion of the lever 147. A sensing lever 152 for detecting the present

Absence of a loaded cassette is at 20> m nearby section around a cardan shaft rotatable and a bent flange portion 1, extends at the distal end of the lever "to a point by the lower surface

154 should be touched, which for a 25

152 is a normally the drive roller 43 is pressed against the drive surface 135a of the coupling part 135, which then rotates in the tape winding direction.This rotational movement of the coupling part 135 is transmitted via the friction part 136 to the coupling part 132 and at the same time via the gear 138 to the coupling part 137 at the same speed. The rotational motion of the clutch member 137 is transmitted through the frictional member 140 to the coupling part 139 and the bearing sleeve 133 which rotates together with the coupling member 139 to the coupling part \ ü. .,.

In this way, the rotational movement communicated to the coupling part 135 by the drive roller 43 is transferred two parallel torque transmission paths comprising clutch mechanisms in the form of one Superimposed torque transmitted to the spool main body 22, in a similar manner as in the embodiment according to FIG. 4. Here is the Main body 22 is integrally formed with the coupling part 132. As a result of the structure described, a relatively high torque on the reel disc main body 22 transferred, and a Tape wraps without irregularities and without others undesirable phenomena on the winding-up reel of the cassette 10 for stationary devices.

Next, consider the case that a

Cassette 154 is used, which is for portable Ge. ate

is intended. When the cassette 154 is in the correct, in de.

Fig. 5 position shown is brought. namely under

a lehlernaiie i_, ua \ -nuMg ν ^ _1. · ,,. “. - .., ._

nearby section is also pivotable about the articulated shaft 153 and carries on its distant At the end of a pin 156a, which is firmly attached there and has such a function. that he is in an in the Bottom surfaces of the cassettes 10 and 154 formed recess fits while the presence or detects the absence of the tape loading condition of a cartridge 10 or a cartridge 154.

The setup described above works as follows. Let us first consider the case that a Cassette 10 is used, which is intended for a stationary device. When the cassette 10 is in the Fig. 5 is brought position shown, namely below guided by the pin 130 engaging the groove 10a in the bottom surface of the cassette the sensing portions of the sensing levers 152 and 156 are engaged with the bottom surface of the cassette 10. Included the correct insertion position of the cassette is sensed, regardless of whether the inserted cassette the recording is complete or not. At the same time it comes out of the cassette holder slot protruding sensing portion 144a of the sensing lever 144 with the bottom surface of the Cassette 10 in close contact with its edge, causing the sensing lever 144 as shown in FIG. 5 turned counterclockwise. Furthermore, in the illustration according to FIG. 6 the rotatable lever 147 rotated against the force of the spring 150 clockwise do, and that provided at the outer end of the lever Gear 138 meshes simultaneously with the tooth section 135b of the coupling part 135 and the tooth section 137b of the coupling part 137. The take-up reel plate 18 'therefore takes the position shown in FIGS. 5 and 6 (> s shown state.

When the record / playback device is in the Recording or playback is switched, the sensing parts of the sensing levers 152 and 156 from the Bottom surface of the cassette 154 actuated, but not the lever 144, which is to determine the type of cassette. the Lever 144 thus remains in its original position since its sensing portion 144a is not in contact with the cassette Touch comes. The rotatable lever 147 is then in a position in which he after the 6 is rotated counterclockwise so that the gear 138 in the Tooth sections 135bund 137b does not engage.

If the recording / playback device is now switched to the recording or playback operating mode is, the drive roller 43 rests against the drive surface 135a of the coupling part 135, whereupon the Part 135 is rotated in the tape winding direction in a manner similar to that described above. This Rotational movement of the coupling part 135 is transmitted to the coupling part 132 via the friction part 136 and at the same time via the abutment sections 135c and 137a pressed against one another on the coupling part 137. In this case, the greater part of the torque of the coupling part 135 is via the Friction part 136 is transmitted to the coupling part 132 while almost no torque is applied to the coupling part 137 is transmitted. For this reason, the torque of the coupling part 135 becomes essentially via a single torque transmission path, namely through the friction part 136 to the spool main body 22, and therefore the take-up reel of the cassette 154 intended for a portable device communicated relatively small torque.

Between the main bodies to the bobbin winder transmitted torques therefore occurs a difference, depending on whether at the Spulcntelleranordnung described the gear in the two tooth sections 135b and 137b of the

Coupling part 135 and coupling part 137 engages or not. The resulting torque difference is considered analytically in the following.

In the event that the gear is in its meshed position and the reel disc main body 22 in the tape winding direction communicated torque is relatively large, the Describe torque Ti by the following equation:

T - ² P

~ T ²

^r 20 ~ ¹ ii

1 P ₁ μ ₂ R

(D

'Ίο ³ T ₁ , ² . / '3 I. ( ^ JO ³ - (2) Mo " Π ) ⁺ Ί μι R +

,"1

V '2 (f

- ^r 2

of equation (I) and the term

! ^r

I.S.

In the event that the gear 138 is not in mesh and the spool main body 22 in The torque transmitted in the winding direction is relatively small, the torque Tj represent by the following equation:

T 2

⁼ T

25th

The following definitions apply to equations (1) and (2): jo

is the inner radius of the friction member 136;
is the inner radius of the friction part 140;
is the outer radius of the friction member 136;
is the outer radius of the friction part 140; is the contact radius between the coupling parts 135 and 137 and the bearing sleeve 133;
is the pressing force of the drive roller 43 against the / wide coupling part 135;

is the spring force of the spring body 141; is the coefficient of friction between the friction part 136 and the coupling part 135 and between the friction part 140 and the coupling part 139;
is the coefficient of friction between the coupling part 135 and the bearing sleeve 133 and between the coupling part 137 and the bearing sleeve 133;
is the inner friction radius between the contact portion 135c of the coupling part 135 and the contact portion 137; id of the coupling part 137;
is the outer contact radius between the contact portion 135t · and the contact portion 137 ;;;

is the coefficient of friction between the contact sections I35c and 137, · ;.

If one compares the equations (I) and (2) with each other, one sees that the corresponding to each other Tenne generally agree with each other, however, the term

You in general r _J0 <^ ₂₀ . the order of magnitude between the above terms is the following Rf>7if> hunn:

Relationship:

/ Ί

f - ¹ ι · J '.V) ~' .Ii

of equation (2) differ from each other.

The torques Ti and Tj, which are communicated to the coupling part 132 of the take-up reel disc 18 'in the tape winding direction, can therefore be used in the event that the gear 138 is in mesh or not! set arbitrarily, namely by appropriate selection of the ratio between the outer radius _r , _{0 of} the friction part 140 and the outer radius r _{l0 of} the friction part 136.

In the example described above, the housing of the cassette 154 with a playing time of 15 minutes, for example, and the housing of the cassette IC with a playing time of 60 minutes, for example, have different shapes, so that the sensing section 144 of the sensing lever 144 is only actuated when the Larger cassette 10 is inserted into the device. In contrast to this, the housing of the cassette 154 for a portable device and the housing of the cassette 10 for a stationary device can also have the same shape. In this case, a recess is provided in the housing of the cassette 154 at the level of the sensing portion 144a of the sensing lever 144, so that the sensing lever 144 is again able to distinguish between the two different cassettes.

It is also possible to give all the cassettes the shape of the cassette 10 for a stationary device and ir to provide a recess for all cassettes at the level of the sensing portion 144i of the sensing lever 144 If you now as a result of the mass of the tape wound in the cassette or as a result of the construction the coil requires a relatively high torque, a pin is inserted into the recess which then actuates the sensing lever 144. If a large amount of torque is not required, the recess will left unchanged so that the sensing lever 144 is able to switch between the various types of cassette to distinguish.

In the embodiment described, it is possible, the torque of the drive roller The driven spool plate part can be changed in two stages, one of which can be selected. Apart from it is also possible to provide a larger number of coupling parts that correspond to coupling part 137 correspond, and provide a greater number of selectors corresponding to the gear 138, so that the resulting from the drive roller 43 torque of the coupling part 132 in three odci several levels can be changed and an optional switch to the torque one desired level is possible.

In the case of the recording / playback Cierät described. at will with a cash desk for eir stationary device or with a cassette 154 for a irageable device can be operated, it is possible depending on the type of cassette used, the torque communicated to the Aufwickel.spiileiileller to change. If you use the described recording / playback Cierat as a portable device and a general installation in this device results as a result of the special BandaulwickcKorgangs economical energy consumption.

In the following, in a simplified manner, FIG. 5 and b describe the structure and operation of the tape supply reel or take-up reel and the mechanism for fast rewinding in the forward direction. Parts that perform the same function as the parts of the winding reel plate 18 'are given away with the addition of a prime with the same reference numbers. These parts are no longer described in detail.

A first coupling part 160 and a second Coupling members 161 which are integrally formed with the bobbin winder main body 23 rotate together with the bearing sleeve 133 ', which is rotatably arranged on a spool shaft 131'. The first Coupling part 160 is surrounded by a brake band 37. The peripheral surface of the second coupling part 161 faces a rewind roller 44.

A rapid advance lever 162 is operated against the force of a spring by operating a rapid advance control rotated counterclockwise in the representation according to FIG. One on the lever 162 rotatably arranged snow feed roller 163 rotates clockwise and is at the same time against the outer peripheral surfaces of the first and second coupling parts 132 and 135 of the take-up reel disc 18 ', as shown in FIG. 6 emerges. As a result, the reel table main body 22 becomes torque in the tape winding direction, and the fast feed operation is performed when the Magnetic tape 16 is withdrawn into the cassette 10 or 154.

For this 5 sheets of drawings

Claims (4)

Patent claims: 1. Recording and / or reproducing device for a tape-shaped recording medium with a reel plate arrangement containing a reel plate main body for receiving a reel, a first coupling part arranged under the reel plate main body, a shaft to which the reel plate main body and the first coupling part are rotatably connected under the first coupling part on the shaft axially displaceable and separately rotatably arranged, drivable second coupling part, a first friction part arranged between the first and the second coupling part for transmitting a torque between the first and the second coupling part, one under the second coupling part on the shaft axially displaceably arranged pressing part, and a second friction part arranged between the second coupling part and the pressing part, the pressing part serving to press the friction parts together between the adjacent parts, characterized in that a dr ittes coupling part (119 ) located between the pressure part spring (121) and the second friction part (120) and connected to the shaft in a rotationally fixed manner; 139) is provided, the second coupling part (117; 135), the first friction part (118; 136) and the first coupling part (116; 132) having a first torque transmission path to transmit the rotational movement of the drive device (43) to the reel disc main body (22) and the second coupling part (117; 135), the second friction part (120; 140), the third coupling part (119; 139) and the shaft (bearing sleeve 111; 133) form a second torque transmission path and the rotary movement of the drive device simultaneously via the first and the second torque transmission can be transmitted to the spool main body. 2. Device according to A.nspruch 1, characterized in that between the second coupling part (135) and the second friction part (140) a fourth coupling part (O7) on the shaft (133) axially displaceable and separated from the shaft and the second coupling part is rotatably arranged and that a coupling device (1356, 1376, 138) is provided which, in the engaged state, couples the fourth and second coupling parts to each other to perform a common rotary movement and which, in the disengaged state, uncouples these two coupling parts from one another, the second coupling part ( 135), the coupling device (1356, 1376, 13Ii), the fourth coupling part (137), the second friction part (140), the third coupling part (139) and the shaft (133) form the second torque transmission path and thus the rotary drive of the drive device engaged clutch device on the first and the second torque transmission oo way simultaneously on the reel point main body and with the clutch device disengaged is only transmitted via the first torque transmission path with a smaller torque to the reel disc main body. 3. Apparatus according to claim 2, characterized in that various types of tape supply housing can be used in the device at will, which contain the tape reels, that in the device sensing devices (lifting! 144) are provided, the types of tape supply housings due to the different shape predetermined types ascertained and that means (147.150) are provided which switch the clutch means from the disengaged condition to the engaged condition in response to the sensing operation of the sensing means. 4. Apparatus according to claim 2 or 3, characterized in that the second coupling part (135) has a first toothed ring (1356) around its entire outer circumference, that the fourth coupling part (137) around its entire outer circumference a second toothed ring (1376, ) and that the coupling device contains a gearwheel (138) which, when the coupling device is engaged, simultaneously engages the first and second ring gears and thereby causes a common rotary movement of the second and fourth reel plate parts.