DE9017928U1 - Magnetic tape cassette device with a drive for magnetic tape cassettes - Google Patents

Description

PHILIPS PATENT ADMINISTRATION GMBH PHD 90-179

DESCRIPTION

Magnetic tape cassette device with a drive for magnetic tape cassettes

The invention relates to a magnetic tape cassette device with a drive which has winding plates, with which a magnetic tape can be wound between winding cores within a magnetic tape cassette, wherein a loading mechanism has a cassette slot and is set up to raise the magnetic tape cassette located in the cassette slot into an ejection position and to lower the magnetic tape cassette into a play position in which the winding cores are placed on winding mandrels, where a pivoting mechanism is provided which interacts with a cassette lever which is pivoted in the insertion direction by an inserted cassette with the aid of a driver displaced by the cassette and in the ejection direction by an ejection rod.

Such a magnetic tape cassette device is known from DE 37 17 587 Cl and DE 38 32 672 Al. The drive of this magnetic tape cassette device has a loading mechanism with a cassette slot that is guided in vertical guides. The cassette slot can be raised and lowered using a lift lever. A cassette driver is movably arranged in the lift lever, which can fall into a hole in an inserted magnetic tape cassette with a nose. A cassette lever engages the cassette driver and can be pivoted about an axis that is perpendicular to the insertion and ejection direction. When a cassette is inserted, the cassette lever ejects an ejection rod via an over-center spring. When the ejection rod is inserted,

PhD 90-179

The cassette lever is pivoted in the opposite direction via the same over-center spring, thereby moving the cassette driver in the ejection direction and ejecting the cassette.
5

To transfer the feed movements from the cassette into the drive, two completely separate parts are used that are connected to each other by a pin connection. The cassette driver moves in a straight line in the direction of insertion, while the cassette lever rotates around a pivot point outside the cassette slot. The cassette lever describes a circular arc with its free end with a radius that is so small that it deviates significantly from a straight line, a line in the feed direction. To compensate for tolerances, the pin connection between the free end of the cassette lever and the cassette driver is provided with a long slot in which the pin can run back and forth perpendicular to the direction of insertion.

It is an object of the invention to provide a magnetic tape cassette device with a drive in which the insertion and ejection movements can take place without an additional cassette driver which represents a special part.

The stated object is achieved according to the invention in that the cassette lever can be rotated about a virtual point which is so far away from the cassette driver for the cassette that the circular arc of the cassette driver movement when pushing the cassette in and out becomes so large that the cassette driver is not obstructed in the winding hole of the cassette transversely to the direction of movement of the cassette, wherein the cassette lever has a circular arc-shaped guide element with a circular arc center which is outside the cassette lever

PhD 90-179

forms a virtual axis of rotation for it, with fixed guide means cooperating with the circular guide element, on which the cassette lever can be rotated about the virtual axis of rotation, with the cassette driver on the cassette lever being designed as a lever component that is springy in the height direction, which can be lowered and raised relative to the cassette to fall into and out of the hole of a winding core, and with the cassette lever being provided with a nose against which a cassette hits at the beginning of its insertion and thus pivots the cassette lever until the spring effect of the cassette driver is prevented and the cassette driver can pull the cassette in with it.

According to a further embodiment of the invention, it is provided that the circular guide element is a groove of the cassette lever, into which the guide means engage as stationary pins.

By shifting the center of the circle around which the cassette lever pivots to a virtual point that can be located outside the drive, the pivot radius around which the cassette lever pivots is so large that the movement path of the cassette driver can be designed to be so straight that the driver,

which is firmly connected to the cassette lever, can engage in the hole of the winding core of the inserted cassette over the entire length of the insertion and ejection path. In addition to the one-piece design of the cassette driver with the cassette lever, there is also the advantage of saving space because the cassette lever is shorter since it ends before its pivot point.

PhD 90-179

According to a further embodiment of the invention, the nose of the cassette lever interacts with the drive edge of the magnetic tape cassette located at the front in the insertion direction, in that the magnetic tape cassette rotates the cassette lever in the insertion direction up to the automatic insertion point when inserted. The drive edge of the magnetic tape cassette thus rotates the cassette lever from the ejection position in the insertion direction. The cassette driver of the cassette lever is relieved.

Since the cassette driver must be suspended flexibly in order to be able to run onto the cassette and fall into the hole in the winding core, it could tend to inadvertently jump out of the hole in the winding core when the cassette is moved. This risk is reduced by the provision of the nose on the cassette lever, which interacts with the driver edge of the magnetic tape cassette. In a further development of the invention, in order to improve the fit of the cassette driver in the hole in the winding core, the housing of the drive is provided with a support which is located so just above the cassette driver over the insertion path of the cassettes, in which the cassette driver must remain fallen into the hole in the winding core, that the cassette driver is forced to remain in the hole. The cassette driver must therefore remain in the hole in the winding core as long as the support prevents it from jumping out.

According to a further embodiment of the invention, a pivot pin of the cassette lever engages in a link lever groove which is provided in a link lever which can be rotated about a fixed pivot point and which forms an intermediate link between the cassette lever and the ejector rod and whose direction of rotation is always opposite to

PhD 90-179

set to the direction of rotation of the cassette lever. By rotating the cassette lever and the link lever in opposite directions, the effective direction of the force application for the automatic insertion following the manual insertion can be set as required.

According to a further embodiment of the invention, a driver is provided on the ejector rod, which couples the ejector rod to the fast-winding rod in such a way that the ejector rod pulls the fast-winding rod in when it is pushed in, and that the fast-winding rod, when released when a cassette is pushed in, pushes the ejector rod out with it. The ejector rod therefore does not need a special ejection spring. Whenever the ejector rod is pushed in to eject a cassette, the fast-winding rod automatically retracts. All buttons remain inside the device as long as no cassette is inserted. However, if a cassette is inserted, the fast-winding rod extends and takes the ejector rod with it on this extension path.

According to a further embodiment of the invention, it is provided that the spring-loaded, extending fast winding rod pivots the cam lever via the extended ejection rod that is carried with it, such that the cassette lever hinged to the cam lever is automatically pivoted further in the retraction direction by the spring force loading the fast winding rod in the outward direction until the magnetic tape cassette is completely retracted. The extension movement of the fast winding rod is thus converted into an automatic retraction movement of the cassette lever.

This leads to a significant structural simplification.

PhD 90-179

The invention is explained in more detail with reference to the drawing.

Fig. la and b in a gear and a switching level the drive of a magnetic tape cassette device for reverse operation with a device for logical fast forward and rewind, in a position for reverse play (reserve play) operation,

Fig. Ic a coupling representation of the drive according to Fig. la/b in section,

Fig. 2a and b in a gear and a switching level the magnetic tape cassette device according to Fig. 1 with fast forward switched on from the reverse play (reserve play) mode,

Fig. 3a and b in a gear and a switching level the magnetic tape cassette device according to Fig. 1 with switched on fast rewind from the

Reverse play (reserve play) operation,

Fig. 4a and b in a gear and a switching level the drive according to Fig. 1 after switching from reverse play mode to forward play mode,

Fig. 5a and b in a gear and a switching level the drive in the switching position for fast forward from the forward play mode,
30

Fig. 6a and b in a gear and a switching level the drive in the switching position for quick return from the forward play mode,

Fig. 7 the drive during switching from forward

PhD 90-179

into reverse mode,

Fig. 7a to 7d in movement stages a transport bar that tilts sideways during the switching process, which is pushed back into its neutral position, Fig. 7e the levers used to switch the running gear rotation direction,

Fig. 7f the drive during the unlocking process at tape ends in the transition from fast forward in forward mode (SVL-NOR) to reverse play mode (REV-Play),

Fig. 8a the drive with the head plate in the eject position,

Fig. 8b the drive with the head plate in the play position,

Fig. 8c the drive with the head plate in the fast-wind or stand-by position,

Fig. 9a the device for changing the pressure rollers of the drive in a schematic representation, 25

Fig. 9b is an enlarged view of Fig. 9a with the changeover mechanism,

Fig. 10a the mechanism for adjusting the head plate in the eject position of the cassette ejection mechanism,

Fig. 10b the mechanism according to Fig. 10a in play position,

Fig. 11 an enlarged view of a guideway for a rod guide for manual reverse,

PhD 90-179

Fig. 12a to c a loading mechanism for a magnetic tape cassette, in three different functional positions, Fig. 13 a motor switching device of the drive,

Fig. 14 a part of a switching mechanism for manual direction reversal,

Fig.15a and 15b a device for achieving a preferred playing direction after inserting a cassette.

The magnetic tape cassette device has a drive (Fig. la and b) with a chassis plate 3 to which all device structures and components of the drive are attached. These include a loading mechanism 5 and a playing mechanism. The playing mechanism includes a drive motor 9 which drives sound shafts 13a and 13b via a Peese 11. The sound shafts 13a and 13b are connected to flywheels 15a and 15b. The playing mechanism also includes winding plates 17a, 17b which, together with winding shafts 19, serve to drive winding mandrels 3.

The playing mechanism also includes a head plate with a head 23 (Fig. 8). This head plate 21 can be moved transversely to the cassette insertion direction 25. Pressure rollers 202a, 202b (Fig. 9) are provided for transporting the magnetic tape 153, which can be pressed onto one or the other of the capstans 13a, 13b depending on the tape pulling direction. A pressure roller control 201 is used for pressing.

PhD 90-179

Drive mechanism with gear for reversing and fast winding

In Fig. la and b, push buttons for a fast winding device 31 are shown, namely a button 33 for fast rewinding and a button 35 for fast forwarding. Button 33 has a button rod 37 for fast rewinding, and button 35 for fast forwarding has a button rod 39 for fast forwarding. Both button rods 37, 39 are loaded in the extension direction by means of a spring 40. Both button rods 37, 39 are provided with guide contours 41a, b, 42a, b, which can have an adjusting effect on the fast winding device 31.

The fast winding device 31 has a central switching lever 43 which can be pivoted about a central axis 44, about which an intermediate wheel 45 can also be rotated. The intermediate wheel 45 consists of two gear wheels 45a, b arranged one above the other and rigidly connected to one another. The central axis 44 is slidably mounted in a slot 44a in the chassis plate 3.

A clutch double wheel 46, which serves as a drive wheel for the winding plates 17a, 17b and the fast winding device 31, is mounted on the central switching lever 43 so as to be rotatable about a clutch axis 72. As Fig. Ic shows, this clutch double wheel 46 consists of two gears arranged on the axis 72, a clutch primary wheel 46a and a clutch secondary wheel 46b, which can be rotated against each other. The primary wheel 46a serves as a drive gear which can be driven by the flywheel gears 47a or b of the sound shafts 13a, 13b in a meshing manner. The secondary wheel 46b acts as an output gear. The clutch primary wheel 46a and the clutch secondary wheel 46b are frictionally connected to one another by means of a clutch 46c.

PHD90-179 10

tied together.

The quick-winding device 31 includes a second switching lever 48, on which a third switching lever 49 is pivotably mounted.

A guide slot, preferably consisting of two aligned parts 50a, 50b, is provided in the chassis plate 3, into which guide pins 51, 51a of the second shift lever 48 engage. A further slot 53 of the chassis, in which a guide pin 53a runs, has a fan-shaped guide contour that limits a permissible pivoting movement of the guide pin 53a to the left and right. The second shift lever 48 is divided into a shift lever part 48f, which is guided in a straight line by means of the guide pins 51, 51a in the slot parts 50a, 50b, and a shift lever part 48g, which is pivotably mounted on the shift lever part 48f, which is guided in a straight line. The pivoting movement of the pivotable shift lever part 48g takes place, depending on the direction of rotation, around axle heads 52a or 52b arranged offset on both sides of a feed line 48e, which can rotate in bearing recesses 52c, 52d of the linearly guided part 48f of the second shift lever 48 depending on the pivoting position. In this way, it is possible to achieve a continuous pivoting movement of the pivotable part 48g of the second shift lever 48 from one end position (SVL in forward play mode) to another end position (SVL in reverse play mode) without the axle distance and thus the tooth engagement of the wheels 45 and 64a being unduly changed.

The pivoting switch lever part 48g carries the guide pin 53a on its inner end 48h and a stop 51c on an extension arm 48i, which interacts with the contours of the button rods 37, 39. The

PHD90-179 11

The shift lever part 48f, which is guided in a straight line by pins 51 and 51a, acts with adjusting heads 54c, 54d on stop edges 55a, 55b of the central shift lever 43 and can move and rotate it under the effect of adjusting contours 48a, 48b of the button rods 37, 39. A spring 54a constantly loads the second shift lever 48 in the extension direction. The second shift lever 48 can be a plastic part that is, for example, molded onto the chassis plate 3 using outsert molding technology. The third shift lever 49 is mounted on the pivotable shift lever part 48g so that it can pivot about the guide pin 53a; It carries two pins 61, 62, which interact with the guide contours 41a, 41b and 42a, 42b of the key rods 37, 39.

A coaxial gear set 64 is rotatable about the guide pin 53a, about which the third shift lever 49 can be pivoted on the second shift lever part 48g. This coaxial gear set 64, which consists of two rigidly connected gears 64a, 64b, constantly meshes with the quick-reverse gear 65, which is mounted on the third shift lever 49 and, like a gear 64b, can be brought into engagement with the winding plates 17a and 17b. A tension spring 66 engages with one end on the pin 61 of the third shift lever 49, while its other end is attached to the central axis 44.

During normal play, the magnetic tape is either moved in a forward direction, i.e. the right capstan 13b pulls the magnetic tape and the right winding disc 17b winds it up, or in

Reverse direction past the tape head 23. In the latter case, the left tape shaft 13a pulls and the left reel platter 17a winds up. In Fig. 1 to 3 the drive is in the

Reverse play operation, i.e. the sound wave

PhD 90-179

13a pulls the magnetic tape and the left reel 17a winds it up. From this reverse play mode the fast forward (SVL) in Fig. 3 and the fast rewind (SRL) in Fig. 2 are considered. 5

Fast forward in reverse play mode

If the user wishes to fast-wind in reverse play mode, this is done by pressing one of the fast-wind buttons 33, 35 of the fast-wind device 31 using the central switch lever 43, the second switch lever 48 and the third switch lever 49. The switch levers 43, 48 and 49 are shown pulled out in Fig. 7e for better clarity. The interaction of these levers 43, 48, 49 in conjunction with the clutch double gear set 46a, b, the intermediate gear 45, the double gear 64a, b and the string 11 reverse gear 65 in conjunction with the winding plates 17a or 17b leads to fast forward (SVL) or fast reverse (SRL) depending on the button 33 or 35 pressed in. The functionality is as follows:

To fast forward in reverse play mode, the fast forward button 35 is pressed as shown in Fig. 2a and b. The adjustment contour 48a of the button rod 39 pushes the second switch lever 48 inwards, whereby the adjustment heads 54c, 54d also move inwards, press the switch lever 43 down over the edges 55a, 55b near the central axis 44 and simultaneously rotate it. When the button rod 39 is pushed in, the pin 61 runs on the guide contour 42a at the same time. The pin 62 folds out of the area of the SRL locking contour 37g and lies on its upper boundary wall 37b. This allows the part 48g of the

PHD90-179 13

second shift lever 48 and the third shift lever 49 pivot clockwise under the force of the spring 66 until the guide pin 53a hits the guide contour 53. As the pressing-in movement of the key continues, the SVL wheel 64 engages with the reverse winding plate 17a. The third shift lever 49 falls behind the SVL locking contour 39g. The third shift lever 49 pivots counterclockwise so far that the teeth of the quick-reverse gear 65 do not engage with the right winding plate 17b. The shift lever 43 is pivoted slightly counterclockwise in the process. The counterclockwise movement is brought about by pivoting the shift lever 43 around the central axis 44 and its displacement in the slot 44a. The double clutch wheel 46a, b was pulled away from the winding plate 17a and instead the gear set 64a, b was switched to the left winding plate 17a, whereby the power is transmitted from the intermediate wheel 45 to the small gear ring 64a of the gear set 64a, b. The fast forward can be released again by pressing the buttons 3 3 for fast rewind. In doing so, a release contour 135b of the push rod 37 pushes a pawl 131 of the locking device 130 back into a central release position (shown in Fig. 3b). The locking mechanism will be described later.

Fig. 3a and b show the engagement conditions for the fast rewind in the reverse play mode.

The fast rewind can be achieved by pressing the button 33 with the associated button rod 37. When the button 33 is pressed, the pin 61 runs along the guide contour 41a and the third switch lever 49 swings clockwise. The pin 62 falls into the SRL catch contour 37g of the chassis 43 and thus holds it in this

PHD90-179 14

Position secured. The straight-line shift lever part 48g is pressed inwards by the adjustment contour 48b of the button rod 37 against the edge 55 of the central shift lever 43. The central shift lever 43 pivots anti-clockwise as it simultaneously slips in the longitudinal slot 44a. The clutch secondary wheel 46b of the clutch double wheel 46a, b is thus lifted off the left winding plate 17a. When the fast rewind is now switched on, the flywheel gear 47a (clutch primary gear) drives the intermediate gear 45, the small gear ring 64a of the gear set 64a, b, the large gear ring 64b of the gear set 64 and the fast rewind gear 65 quickly to the right-hand winding plate 17b via the drive gear 46a of the clutch double gear 46a, b. The fast rewind gear is ended by pressing the button 35 for fast forward, which pushes the pawl 131 back into the middle position with its pre-tensioning and release contour 135a.

Reversing mechanism

Since the drive is a drive with reversing tape travel, the reel drive must be switched in both tape pulling directions when the tape stops at the end of the tape, whereby it makes a difference whether the end of the tape is reached in play mode or from high-speed mode. In both cases, the tape pulling direction and the tape drive are reversed using a direction reversing device 68, by means of which the central switching lever 43 is pivoted about the central axis 44 so that the double clutch wheel 46a, b is switched from the capstan 13a and its flywheel gear 47a to the capstan 13b with its flywheel gear 47b.

At the same time as the gear lever 4 3 is moved, the

PHD90-179 15

third shift lever 49 in the drawing moves from the right to the left side of the central shift lever 43 (Fig. 4 to 6). After the shift, the pin 61 interacts with the guide contours 42b and 41b. At the same time, the pressure rollers 202a, b are also moved.

The change in the direction of tape travel at the end of the tape is described using Fig. 1a and b. The description starts from reaching the end of the tape from the reverse play mode. According to the drawing, the drive is switched from the representation in Fig. 1 to the representation in Fig. 4. The initiation of this reversal process from the reverse play mode is a sliding cam 69, which belongs to a control element 77 and slides on the secondary clutch wheel 48. A second arm 75 of the control element 77 serves as a switching arm. A switching wheel 79 is provided, which has an eccentric, ring-shaped cam curve 81 around its axis 80. Furthermore, a control curve 82 is provided on the switching wheel 79, the curvature of which corresponds to the curvature of a spiral part. The switching arm 75 has a button 83 that can move around the cam curve 81 and run onto the control curve 82. The switching wheel 79 is constantly in engagement with the flywheel gear 47b of the flywheel 15b or the sound shaft 13b.

If the driven gear 46b (coupling secondary gear), as shown in Fig. la and b, rotates because the driven winding plate 17a or its shaft 19 rotates, then the arm 78 of the control element 77 is rotated clockwise by the friction force between the driven gear 46b and the sliding cam 69. This results in the sensor 83 moving along the cam curve 81 (Fig. 4a). However, if the driven winding plate 17a stops, for example due to the end of the tape, then the driven

PHD90-179 16

gear 46b, and the friction force described no longer presses the control element against the cam curve 81. The loss of this pressure force results in the button 83 and thus also the control pin 75 remaining at the highest point of the cam curve 81, whereby the button comes into the rotation range of the switching curve 82. The button now runs onto the control surface 84 of the switching curve 82 and moves outwards. As a result of this outward movement, a control pin 85 of the control element 77 presses against a stop surface 86 of a reversing plate 87, which can be pivoted about an axis 88. The reversing plate 87 pivots clockwise when the control pin 85 strikes the stop surface 86. The coupling shaft 72, which constantly engages through a slot 90 of the reversing plate 87, is pressed by the pivoting reversing plate 87 in the direction of the other capstan 13b, whereby the switching lever arm 43c of the central switching lever 43 is also forced to pivot in the direction of the capstan 13b.

Before further describing the reversal process when the belt is at a standstill, the structure of the direction reversing device 68 which now comes into effect is described.

The direction reversing device 68 has a tiltable transport rod 98 with rack sections 98a, 98b. The transport rod 98 is pushed back and forth when changing direction, apart from tilting in the direction of a double arrow 98c. The transport rod 98 has a driver 100a, 100b on each side in the direction of displacement 98c. Two stationary guide pins 101a, 101b attached to the chassis plate are provided. A bearing pin 101c is part of an actuator 503 described in connection with the preferred starting direction. In a middle position of the transport rod 98, as can be seen in Fig. 1, there are guide pins 101a,

PHD90-179 17

101b on both sides outside a guide pin groove 102a, 102b.

When the transport rod 98 is moved, one of the guide pin grooves 102a, 102b moves onto one or the other guide pin 101a, 101b. The respective rack section 98a, 98b engages with the corresponding flywheel gear 47a or b. Tilting grooves 103a, 103b extend parallel to the guide pin grooves 102a, 102b, into which the guide pin 101a, 101b located in the corresponding guide pin groove 102a or b can fall after overcoming a supporting wall 104a or 104b. The transport rod 98 tilts around the chassis-fixed bearing pin 101c. The central shift lever 43 is provided on the shift lever arm 43c with a square projection 99 which can interact with the transport rod 98.

As the movements to reverse the direction continue, the square projection 99 presses against the transport rod 98, when the reversing plate 87 pulls the central switching lever 43 with the switching lever arm 43c located towards the transport rod 98 anticlockwise in the direction of the line of symmetry 48e. As a result, the transport rod 98 is moved from the position shown in Fig. 1 to the right, the guide pin groove 102b moves onto the guide pin 101b and is caught by it (Fig. 7a). The rack section 98b engages with the right flywheel gear 47b; thus the right flywheel gear 47b pulls the transport rod 98 further to the right. During this movement of the transport rod 98, the driver 100a hits an edge 87d of the reversing plate 87, causing it to pivot further clockwise. By coupling the reversing plate 87 and the central switching lever 43 via the axis 72 guided in the slot 90, the central switching lever 43 also pivots, namely in an anti-clockwise direction. The transport rod 98 continues to move

PHD90-179 18

to the right until the guide pin 101b can fall past the support wall 104b into the tilting groove 103b. The transport rod 98 tilts and the right flywheel gear 47b disengages from the rack section 98b (Fig. 7b).

The reversing plate 87 carries a bearing pin 94 into which an arm 96a of a leg spring 95 is hooked. The other arm 96b of the leg spring 95 engages a bearing pin 97 on the chassis plate 3. When pivoting clockwise from the position of Fig. 1 to Fig. 4, the leg spring 95 is tensioned to the dead center. After this point is exceeded, the direction of force on the reversing plate 87 is reversed, so that the reversing plate 87 and thus also the central switching lever 43, driven by the spring force, pivot further into the forward play position according to Fig. 4.

When the reversing plate 87 pivots from the position shown in Fig. 1 to 3 to the position shown in Fig. 4 to 6, it has taken the central shift lever 43 with it via the clutch axis 72 and in the process pivots its shift lever arm 43c with the square extension 99 beyond the middle position. This results in the third shift lever 49 being flipped over in an anti-clockwise direction, since its pin 61 is taken along by the flip-over contour 117a or, in the other direction, by 117b of the central shift lever 43. The spring 66 now no longer pulls the third shift lever 49 in the direction of the winding plate 17b, but in the direction of the winding plate 17a.

The transport rod 98 has now fulfilled its task of reversing the direction from reverse to forward operation and must return to its neutral center position. A return spring 107 serves this purpose. This return

PHD90-179 19

The adjusting spring 107 is hairpin-shaped with crossing legs 107a and 107b. The winding 107e of the return spring 107 encloses the chassis-fixed reversing axis 88. In the rest position, the legs 107a, 107b also enclose the bearing pin 101c arranged on the adjusting element 503 and a driver 98d on the transport rod 98. The legs 107a, 107b also each carry outward-reaching arms 107c, 107d.

The changeover process is explained using Fig. 7a to 7d. In contrast to Fig. 7a to 7d, Fig. 7 shows the drive during the changeover from forward operation (winding plate 17b is driven) to reverse operation (winding plate 17a is driven).

The transport rod 98 has been moved to the right in Fig. 7a to 7d and the rack section 98b is in engagement with the flywheel teeth 47b. The guide pin 101b has reached the support wall 104b in the guide pin groove 102b. The return spring arm 107b is driven and pre-tensioned by the displacement of the transport rod 98 to the right by means of the driver 98d. The arm 107c interacts with pressure pins 110a in such a way that the arm 107c in the illustration according to Fig. 7a pivots the transport rod 98 around the bearing pin 101c in a clockwise direction by pressing against the pressure pin 110a until the guide pin 101b in the tilt groove 103b hits a tilt groove wall 103c. The teeth 47b and 98b are thus separated from each other.

Now the compression spring arm 107b, which was moved and braced to the right by the transport rod driver 98d, can push the driver 98d back to the left, whereby the guide pin 101b leaves the tilting groove 103b (Fig. 7c).

PHD90-179 20

A stop 111 is provided on the transport rod 98, which interacts with chassis-mounted guide pieces 112, 113. The stop 111 runs into the guide piece when the transport rod 98 is moved back to the left before the middle position is reached. The force of the return spring arm 107b, which is still rotating, then turns the transport rod back from its pivoted position to the non-pivoted position. In this straight position (Fig. 7d), the effect of the stop 112 is lost and the transport rod, still driven by the return spring, moves to the middle position.

The reversal of the tape tension direction at the end of the tape from high-speed operation is essentially carried out in the same way. The only difference is in the initiation of the reversal process. At the end of the tape in play mode, the stationary output gear 46b triggers the reversal because it does not exert a restoring force on the switching arm 75 when the tape is at a standstill and ultimately the control pin 85 pivots the reversing plate 87 clockwise by pressing against the stop surface 86. This mechanism is bypassed from high-speed operation. Since the motor drive is not separated from the winding plate by a clutch in high-speed operation, a significantly higher torque is exerted on the drive gear 46a when the reel is blocked at the end of the tape than in play mode or during high-speed winding. As a result, at the end of the tape, when the winding plate 17a, for example, is at a standstill in high-speed winding mode, the respective drive gear 46a, b, 47a, b is pressed apart against the force of the spring 95. This release is accompanied by a slight pivoting of the central control lever 43 anti-clockwise when stationary in reverse operation and clockwise when stationary in forward operation. This pivoting movement of the

&Rgr;&EEacgr;&OHacgr; 90-179 21

Switching lever 43 results in the square attachment hitting the transport rod 98 and moving it so far that the rack section 98b (when stationary in reverse mode) engages with the right flywheel gear 47. The reversal process then takes place in the same way as was already described for reversing at the end of the tape from reverse mode to play mode (Fig. 1 to 6).

In order to ensure that the entire high-speed gear, consisting of clutch primary gear 46a, intermediate gear 45 and high-speed forward (SVL) gear or high-speed reverse (SRL) gear 65, remains blocked at the end of the belt until the transport rod 98 is brought into engagement with the respective flywheels 47a/b by the pivoting of the central switching lever 43, it is necessary to keep the high-speed gear engaged with the winding gear 17a or 17b in engagement. The pins 61 and 62 on the third pivot lever 49 serve this purpose. When running quickly from reverse play mode, they work together with the SRL locking contour or SVL locking contour 39g on the chassis and when running quickly from forward play mode, they work together with the SRL locking contour 37f on the SRL rod 37 and with the SVL locking contour 39f on the SVL button. The locking is achieved by the toothing forces of the intermediate wheel 45 always turning the pivoting part 48g of the second shift lever 48 at the end of the tape in the direction in which the third shift lever 49 is pointing. As a result, during fast forward in reverse operation, the pin 62 moves under the SRL locking contour 115 and during fast reverse in forward operation, the pin 61 moves against the SRL locking contour 37f, which prevents further pivoting of the pivotable part 48 g of the second shift lever 48

PHD90-179 22

and the gears remain engaged. If, after the transport rod tooth sections 98a and 98b have engaged, the meshing between the respective flywheel gears 17a/b and the clutch primary gear 46a is separated by the subsequent further rotation of the central shift lever 43 and thus also of the clutch double gear 46, then the torque that rotates the pivotable part of the second shift lever 48 is eliminated and the locking of the SL wheels is released under the effect of the restoring spring force of the spring 66. The throwing over of the third shift lever 49 to the other side as the central shift lever 43 switches over can then take place.

The stop 51c on the pivoting part 48i of the switching lever also serves to prevent malfunctions. In the event that the operator of the drive is holding down the SRL button at the time of switching, the stop 51c comes to rest in a holding contour 37k on the SRL button when the button 33 is pressed. This ensures that the pivoting part 48g of the second switching lever 48, when the third switching lever 49 is lifted out of its SRL locking mechanism, consisting of the pin 62 and the SRL catch contour 39g or the pin 61 and the SRL locking contour 37f, can only pivot under the effect of the force of the spring 66 so far that the SVL wheel does not engage with any of the winding wheels 17a, 17b.

During the pivoting of the central switching lever 43, the locking of the high-speed rods 37, 39 is additionally released by an actuating piece 137 located on the central switching lever 43 hitting against a release pin 131c of a ratchet lever 131 and thus turning the ratchet lever 131 clockwise.

PHD90-179 23

Forward play operation

Fig. 4a and b show the relative position of the parts of the game mechanism in forward play mode. Both fast-wind buttons are disengaged. The flywheel gear 47b drives the drive gear 46a, the intermediate gear 45, the driven gear 46 and the winding plate 17b. The third switching lever 49 is turned to the left and the switching lever 43 is pivoted anti-clockwise.

Fast forward in forward play mode

Fig. 5a and b show the position of the drive during fast forward from forward play mode. The functions correspond to those of Fig. 2, but the central switching lever 43 derives the drive from the right flywheel gear 47b. If the button 35 for fast forward (SVL) is pressed, the adjustment contour 48a of the button rod 39 presses the second switching lever 48 and the adjusting heads 54c, 54d inwards. The adjusting heads 54c, 54d then hit the edges 55a, 55b of the central switching lever 43 near the central axis 44. At the same time, the pivotable part 48g of the switching lever 48 with the guide pin 53a on the fan-shaped slot 53 of the chassis pivots to the right. When the key rod 39 is pushed in, the pin 61 lies on the guide contour 42b, whereby the teeth of the string 11 return gear 65 do not engage with the winding plate 17a. The guide pin 53a of the pivoting part 48g of the second switching lever 48 is pressed in until it stops in an anti-clockwise direction around the axle head 52b against the inner right-hand end of the fan-shaped slot 53.

PhD 90-179

pivoted. The central switching lever 43 was thus pivoted slightly clockwise. The output gear 46b of the double clutch wheel 46a, b was pulled away from the right winding plate 17b and instead the gear 64b was switched to the ring gear 17e of the right winding plate 17b, whereby the power is transmitted from the double clutch wheel 45a, b to the small ring gear 64a of the gear set 64a, b and via the large ring gear 64b to the ring gear 17e of the winding plate 17b. The fast forward can be released again by pressing the buttons 33 for fast rewind. The release contour 135b provided on the button rod 37 presses the pawl 131 back into its central position.

Fast rewind in forward play mode

Fig. 6a and b show the engagement conditions for the fast rewind in forward play mode.

The fast return can be achieved by pressing the button 33 with the associated button rod 37. When the button 33 is pressed, the adjustment contour 48b presses the second switching lever 48 and its adjusting heads 54c, 54d inwards and the pin 61 runs along the guide contour 42b. A pivoting movement of the part 48g of the second switching lever 48 is prevented because the pivotable part 48g of the second switching lever 48 is held by the pin 61 on the guide contour 41b of the button rod 39. The pivotable part 48g of the second switching lever 48 takes the third switching lever 49 with it during its pressing movement.

The adjusting heads 54c, 54d press against the edges 55a, 55b of the shift lever 43. The central shift lever 43 pivots clockwise and is simultaneously moved inwards in the slot 44a. The output gear 46b of the clutch double gear 46a, b is thus lifted from the right

PHD90-179 25

winding plate 17b. With the fast rewind (SRL) now switched on, the flywheel gear 47b drives the left-hand winding plate 17a quickly via the drive gear 46a of the double clutch gear 46a, b, the intermediate gear 45, the small fast-running gear ring 64a of the fast-running gear set 64a, b, the large fast-running gear ring 64b of the fast-running gear set 64a, b and the fast rewind gear 65. The fast rewind is ended by pressing the button 35 for fast forward. The pre-tensioning and release contour 135a of the other button rod 39 pushes the pawl 131 back into its middle position.

Fast rewind button lock

The key rods 37, 39 are provided with a locking mechanism 130, which holds the pressed-in key rod 37, 39 in the pressed-in position until the pressed-in position is released by pressing the other key rod 37, 39. The release after release is effected by the compression spring 40, which always loads the key rods 37, 39 in the release direction. The locking mechanism 130 consists of the rod-shaped latch lever 131, which can be pivoted about an axis 13 2 mounted in the chassis plate 3. On one side of the latch lever 131, an arm 139 is provided, against which a spring 133 presses. The pressed-in key rod 37, 39 pivots the latch lever 131 over the respective pre-tensioning and release contour 135a/b against the force of the spring 133 so that the pressed key can move past the latch until the rear end 131b of the latch lever 131 falls behind one of two locking projections 136a, b and the key that has just been pressed can thus be blocked in the inserted position. Such

PÖD 90-179 26

Locking positions are shown in Fig. 2, 3, 5 and 6 for the two key rods 37, 39.

The locking mechanism can be released as desired by the device user by pressing the button that is not currently locked, in such a way that the respective contour 135a, b of the releasing button presses against the release contour 131d of the latch lever 131, whereby the latch lever 131 pivots and the locking mechanism is released.

The release of the locking mechanism when switching the tape tension direction is carried out in high speed with the key rods 37, 39 pressed in by means of the central switching lever 43, which has an actuating piece 137. The actuating piece works together with the release pin 131c, which is arranged on the ratchet lever 131. If the central switching lever 43 moves over the ratchet lever 131 in the illustration according to Fig. 7f and with the actuating piece 137 past the release pin 131c, the release contour 137 turns the ratchet lever 131 into the middle position according to Fig. 7 and the locking of the key rod that has just been pushed in is released so that it can extend. In the illustration according to Fig. 7f, the actuating piece 137 has pivoted the release pin 131c and thus the latch lever 131 in a clockwise direction.

Head plate adjustment

Fig. 8a, b and c show a mechanism for adjusting the head plate in ejection and start-up (eject), play and fast-winding mode. The head plate 21, which carries the sound head 23, is adjustably mounted by means of a cam follower in bearing guides 151, which enable the head plate 21 to be moved parallel to the tape guide.

PHÜ 90-179 27

153. The bearing guides 151 guide the head plate 21 in the feed direction 152 relative to the magnetic tape 153 to be scanned (Fig. 8b), a magnetic tape cassette 200. A head plate spring 21f strives to pull the head plate from the play position, in which the sound head 23 rests against the magnetic tape 153, via the fast-wind or stand-by position into the eject position.

The head plate 21 has plate legs 21d, 21e at its longitudinal ends 21b, 21c. The plate leg 21d carries a cam 155 which interacts with a catch lever 162. The plate leg 21e carries the drag lever 150.

The switching wheel 79 can be coupled to a drag wheel 157, which is mounted in the chassis. The drag wheel 157 has a control contour 157a, which interacts with the rocker arm 150. The drag wheel 157 also has a segment toothing 157b and an annular locking wall 157c on the outer circumference 157d. The drag wheel has a flat surface 157e.

If the head plate 21 is in the eject position with the drive motor 9 at a standstill (Fig. 8a), the rocker lever 150 is pivoted counterclockwise due to the force of a rocker lever spring 154 acting on it, so that it pivots in the direction of the rocker wheel 157 and rests against the locking wall 157d. The rocker lever spring 154 is designed as a leg spring, the legs 154a, 154b of which interact with chassis cams 160a, 160b, which are located one behind the other to the side of the rocker lever 150 in the head plate displacement direction, as well as with rocker lever cams 161a, 161b on the rocker lever 150. The spring coils 154c of the rocker lever spring 154 enclose a dome-like

Bearing ring 15Od of the rocker arm 150. A bearing axis 150a of the rocker arm 150 provided on the head plate 21 engages through this bearing ring 15Od. In the retracted ejection position, the leg 154b thus rests on the chassis cam 160b and the leg 154a on the rocker arm cam 161a, so that the rocker arm 150 is loaded in the direction of the drag wheel 157.

If the drive is started electrically, i.e. the sound waves 13a, 13b start running, then the drag wheel 157 should pull the head plate 21 into the playing position. To do this, a coupling must be created between the switching wheel 79 and the drag wheel 157, which must be released again after the head plate 21 has been moved into the playing position. An adjusting spring 166 with a first leg 166a and a second leg 166b is provided for these coupling and decoupling processes. The winding 166c of the adjusting spring 166 encloses a bolt 167, which is guided in an L-shaped groove 168 of the chassis and can be adjusted from the head plate by means of two adjusting edges 21g and 21h arranged on the plate leg 21e. A leg 168a of the L-shaped groove 168 serves as a locking lug for the bolt 167.

The first leg 166a of the adjusting spring 166 is supported on the chassis. The second leg 166b rests on a flat surface 157e arranged on the cylinder wall of the drag wheel. The drag wheel 157 therefore always strives to rotate in such a way that its flat surface 157e is aligned parallel to the second leg 166b of the adjusting spring 166. The bolt 167 is displaced in the L-shaped groove 168 in such a way that it rests on the adjusting edge 21h on the head plate leg 21e. Since the winding of the adjusting spring 166 is attached to the bolt 167, in this position the second leg 166b assumes a direction in which it

PHD90-179 29

The towing wheel is turned until the gearing engages with the steering wheel.

If a cassette is inserted, the motor 9 starts and the winding reel of the cassette 200 as well as the sound shafts 7a, 7b and the drag wheel 157 begin to rotate. Since the drag lever 150 rests against the locking wall 157c of the drag wheel 157, the drag lever 150 is prevented from immediately coming into the effective range of the drag wheel cam 157a. The drag wheel begins to rotate anti-clockwise, whereby the drag lever 150 slides off the receding ring-shaped locking wall 157c. However, it falls onto the cylinder wall of the drag wheel cam 157a and therefore cannot yet be dragged along. The drag wheel 157 continues to rotate and the rocker arm 150 slides off the cylinder wall of the drag wheel cam 157a and can only now fall into the effective range of the drag wheel cam 157a. After approximately half a rotation of the drag wheel 157, the head plate transport into the play position begins. During the entire rotation of the drag wheel 157 described above, the reel of the cassette rotates, whereby any tape loop that may be present is removed before the head plate 21 is moved.

The drag wheel 157 pulls a cam 150b of the rocker arm 150 by means of the drag wheel cam 157a and moves the head plate 21 against the action of the head plate spring 21f in the feed direction into the play position.

In the playing position, the cam 155 of the plate leg 21d falls into a play recess 162a of a catch lever 162, which is pivotably mounted on the eject rod 302 and is loaded clockwise by a catch lever spring 163. The play recess 162a of the catch lever has a self-locking effect. The head plate 21 is thus in the

PHD90-179 30

Play position is held. The chassis cam 160a presses against the leg 154a of the leg spring 154 and pivots the drag lever 150 out of the effective range of the drag wheel 157. If a return of the head plate 21 from the play position to the eject position is desired, then the catch lever 162 with the inserted eject rod moves away in the insertion direction and releases the head plate, whereby the head plate spring 21f can pull the head plate back into the eject position. However, if a return to the eject position is not desired, but rather a fast-winding position, which corresponds to a stand-by position in which the head plate 21 is only partially retracted, then the catch lever 162 is blocked in the fast-winding position after a short pivoting counterclockwise. The cam 155 falls into a fast winding recess 162b (Fig. 8b). The anti-clockwise pivoting is caused by a projection 401a, b of the pressed-in fast winding rod 37, 39 during the transition to fast winding by pushing a limiting pin on the catch lever 162 away from it. The pivoting movement is limited by a guide edge 37e, 39e of the pressed-in fast winding rod 37, 39 by limiting the pivoting path of the limiting pin 162d.

During the standby function, both depressed fast-winding rods 37, 39 move and block the head plate 21 in the fast-winding position.

Fig. 8c shows this fast-winding position of the head plate 21, whereby the drag lever 150 keeps the drag lever 150 swung out under constant pressure of the chassis cam 160a on the leg spring 154. From the position according to Fig. 8c, the head plate always returns, regardless of whether the

PHD90-179 31

If the player is to be thrown (eject) or to be restarted in play mode is desired, the player first returns to the eject position by the catch lever 162 releasing the cam 155. As a result of the return to the eject position, the drag lever 150 pivots anti-clockwise into the effective range of the drag wheel 157. If the drive motor of the sound shafts 13a, 13b is switched off when returning to the eject position, the head plate 21 remains in the eject position. However, if the sound shafts 13a, 13b continue to rotate with the motor 9 switched on, the pivoted-in drag lever 150 pulls the head plate 21 back into the play position, and the catch lever 162 locks the head plate 21 with its play recess 16 2a in the play position.

Pressure roller adjustment

Fig. 8a to c show not only the head plate adjustment, but also the adjustment device 201 for the pressure rollers 202a and 202b, which are pressed against the capstans 13a or 13b for tape transport. The drive gear is in the forward play direction in Fig. 8a to 8c (recognizable by the position of the reversing plate 87 shown in dashed lines). Fig. 9a and 9b show the pressure roller adjustment, but the drive gear is in the reverse play direction. The pressure rollers 202a and 202b are mounted with their shafts 204 in slots 203a, 203b of a pressure roller bracket 203. A pressure spring bracket 205 presses the shafts 204 with the pressure rollers 202a and 202b in the direction of the capstans 13a, 13b. The pressure roller spring bracket 205 is clamped on the pressure roller bracket 203 between clamping pieces 203c, 203d.

' PHD90-179 32

In order to place one or the other pressure roller 202a, b on the associated sound shaft 13a, 13b, the pressure roller bracket 203 is pivoted or tilted. The pivoting or tilting of the pressure roller bracket 203 is explained using the enlarged illustration in Fig. 9b. A cutout 206 is provided in the head plate 21, which is shown in dash-dotted lines in Fig. 9b. The reversing plate 87 is mounted so that it can rotate about the chassis-fixed reversing axis 88. This reversing plate 87 carries a forming cam 207, which engages in the cutout 206 of the head plate 206. The pressure roller bracket 203 carries contour pieces 208a, b, which also interact with the forming cam. The pressure roller bracket 203 is adjustable around the head plate 21 around a fictitious bearing point 209. This bearing point forms the center for the circular arc-shaped contours 206a and 206b.

Due to this arrangement, the pressure roller bracket 203 can be pivoted in the direction of a double arrow 210. The pivoting position is determined by the reversing plate 87. In Fig. 9a, the head plate 21 has moved forward into the playing position and the reversing plate 87 is in the reverse playing direction. This means that the pressure roller 202a is in contact with the capstan 13a. This contact is brought about by the forming cam 207 hitting an edge 211a of the contour piece 208a. The forming cam 207 has thereby pivoted the pressure roller bracket 203 clockwise around the pressure bracket bearing point 209. The positions according to Fig. 9a and 9b correspond to one another. Fig. 9b is only an enlarged illustration that serves to provide a better overview.

Fig. 8a shows the head plate 21 in the eject position and the reversing plate 87 in the forward play direction. In the eject position, the forming cam 207 is

PHD90-179 33

in an area 212 of the head plate cutout 206. The pressure roller bracket 203 is aligned parallel to the head plate 21 due to the shape in the area 212. Both pressure rollers 202a, b are retracted from the capstans 13a, b.

In Fig. 8b, the head plate 21 is moved into the play position in forward play mode and locked there by means of the catch lever 162. The reversing plate 87 is accordingly in the forward play position. The pressure roller bracket 203 presses the pressure roller 202b against the capstan 13b via the pressure spring bracket 205. The forming cam 207 is located in front of the setting edge 211b of the contour piece 208b and presses counterclockwise against the pressure roller bracket 203. The pressure roller 202b rests against the capstan 13b.

In the illustration according to Fig. 8c, in which the head plate 21 is in the fast-winding position, the forming cam 207 does not rest on the edges 211a or 211b of the contours 208 because the head plate has fallen back. The pressure roller 202a, b, which was just resting on the capstan associated with it, is therefore no longer pressed against the capstan.

Loading and firing mechanism

The drive includes an eject button 301 with an eject rod 302, shown in Fig. 10a and 10b. The eject rod 302 carries functional tabs, each of which has a specific task assigned to it. A catch lever tab 303 carries the catch lever 162. A link tab 304 interacts with a locking cam 307 of a link lever 305 mounted in the chassis at the pivot point 305a. A locking

PHD90-179 34

tab 306 interacts with the locking cam 307 of a cam lever 305. A multi-function tab 308 can release the fast-wind buttons and initiate the reversal of the tape pull direction. Fig. 10a and 10b show a cassette lever 310 for pulling in and ejecting the magnetic tape cassette 200 as a further component of the drive.

The cassette lever 310 can be pivoted about a virtual pivot point 363. Its actual pivot bearing is carried out on two guide pins 366 that are fixed to the chassis and that pass through a circular groove 367 of the cassette lever 310. The curvature of the groove 367 corresponds to the curvature of a circle around the virtual pivot point 363. If the virtual pivot point is far enough away, the curvature of the groove 367 becomes relatively flat. The actual length of the cassette lever 310 is thereby shortened. The cassette lever 310 has a nose 362 against which a cassette front wall 200c that is located at the front when a cassette 200 is inserted can hit. This front wall 200c also serves to push the cassette 200 out when it is pushed out.

A cassette driver 368 is formed in one piece with the cassette lever 310 and is designed so that it can fall into the hole 361 of a winding core. Its path of movement around the virtual pivot point 363 approaches a straight line. The cassette driver 368 must be elastic enough to run onto a cassette side wall 200a and then fall into the hole 369 of the winding core 361. This elasticity entails the risk that the cassette driver 368 will inadvertently jump out of the hole 369. To prevent this, a support (not shown) is provided. This holds the driver 368 down during the path on which the driver 368 that has fallen into the hole 369 in this

PHD90-179 35

must remain.

The cassette lever 310 has an ejection lever edge 373 which interacts with a release pin 138 of the locking device 130. When the release pin 138 is pushed away, the ejection lever edge 373 releases the fast winding rod lock, so that the fast winding rods 37, 39 and, coupled via a driver, the eject rod 302 can also extend.

Rotating the cassette lever 310 causes a cam lever 305 that can pivot about a fixed pivot point. The cam lever 310 is provided with a cam lever groove 365 into which a pivot pin 364 of the cassette lever 310 engages. The cam lever 310 also has a locking cam 307 that interacts with a locking tab 306 and a cam tab 304 of the eject rod 302, depending on the direction in which the eject rod 302 can be moved. The functionality of this mechanism is described in the sections on the insertion and ejection process.

A single-armed lever 311 is mounted in the chassis at the pivot point 311b; it is rotated about its pivot point 311b by means of a pin 311c provided on it, which is guided in a contour 308a in the multi-function bracket 308. The free end 311a of the lever 311 articulates a reversing claw 312, which runs through a multi-track guide 314 provided on the chassis with a pin 313. This multi-track guide 314 is shown enlarged in Fig. 11; it consists of an inlet track 314c and two first and second return guide tracks 314a, 314b branching off from it in opposite directions. The multi-track guide and its functionality are described in detail in the section Manual reversing.

PHD90-179 36

Fig. 12a to c show the loading mechanism of the drive, in particular the cassette slot associated with it

321. This consists of a sheet metal part 321 with a shaft side wall 3 22 and two leg plates 323 and 324. The cassette shaft 321 is mounted so that it can rotate about a rotation axis 325. The leg plates 323, 324 enclose an angle of less than 180° with one another. In the loading position, the upper leg plate 323 is approximately horizontal. A magnetic tape cassette 200 can thus be inserted horizontally into the cassette shaft 321 (Fig. 12a). The lower leg plate 324 is pivoted upwards in this loading position. The magnetic tape cassette 200 lies in a saddle fold 3 27 in the shaft side wall

322. When the cassette slot 321 is lowered (rotating about its axis of rotation 3 25), the saddle fold 327 is swung aside in the direction of an arrow B. The cassette is held by the catch pins 354, or, due to their design, is additionally pulled away from the saddle fold 3 27 in the direction of an arrow A during the downward movement of the cassette (Fig. 12b).

Due to this relative movement, the cassette 200 loses its support after a certain lowering at the saddle fold 3 27 and folds into the horizontal lowered playing position. The magnetic tape cassette rests on a cassette support 331, 331a (Fig. 12c).

The pivoting of the cassette slot 3 21 takes place when the ejector rod 302 is moved via a not shown sliding guide. A leaf spring 332 is attached to the upper leg plate 3 23. The free end 333 of the leaf spring presses against the cassette 200 inserted into the slot 3 21. In the playing position shown in Fig. 12c, the leaf spring 332 lifts up from the position according to Fig. 12a or 12b and presses on the cassette

PHD90-179 37

200. The cassette 200 is held securely in the playing position.

When the cassette 200 is transferred from the playing position according to Fig. 12c to the ejection position according to Fig. 12a, the cassette 200 is initially lifted slightly by the lower leg plate 324, whereby it is pivoted clockwise under the force of the spring 332 about a point ζ (Fig. 12c) on the lower leg plate 324 until the upper wall 200a of the cassette 200 is supported on the upper leg plate 323 (Fig. 12b). The shaft 321 pivots in the direction of an arrow C according to Fig. 12b into the position according to Fig. 12a.

Shortly after the lower wall 200b of the cassette 200 is above the saddle fold 3 27 and has left the catch pins 354, a return contour 3 29 presses the cassette into the saddle fold as the shaft is folded further into the eject position. The cassette 200 has thus reached its eject position again (Fig. 12a). The cassette 200 can then be pushed out of the shaft 3 21 using the cassette lever 310.

Collection process

As long as the drive is not in operation, i.e. no cassette is inserted, all three buttons, i.e. the fast-wind buttons 33 and 35 and the eject button 301 with their button rods 37, 39 and 302 are retracted. One possibility of joint retraction is described in the German patent application P 39 36 076.8 (PHD 89-194). When pressed, the eject rod 302 takes the fast-wind rods 37, 39 with it via a driver 360 (not shown). All three buttons 33, 35 and 301 are therefore

PHD90-179 38

ejected cassette 200 is fed into the device.

If a magnetic tape cassette 200 is now inserted into the cassette slot 321, the magnetic tape cassette 200 hits the nose 362 of the cassette lever 310 with its cassette front wall 200c. The cassette driver 368 engages in the hole 369 of the first cassette winding core 361 (Fig. 10a). The cassette lever 310 is then forced to pivot anti-clockwise about the virtual pivot point 363, whereby the cassette driver 368 is prevented from sliding out of the winding hole 369 by moving under a support on the cassette slot 321. The pivot pin 364 of the cassette lever 310 moves along the guide groove and pivots the guide lever 305 clockwise.

The clockwise pivoting cam lever 305 presses its pressure tab 370 against a cam of the catch lever 162, whereby the catch lever spring is pretensioned anti-clockwise. The locking cam of the cam lever 305 moves to a tip 372 of the locking tab 306. At the moment the locking cam 307 reaches the tip 372, the ejection lever edge 373 of the cam lever 310 strikes the release pin 138 of the latch lever 131. This unlocks the fast winding rods 37, 39; they extend by means of the force of the spring 40 acting on them. The fast winding rods 37, 39 take the ejection rod 302 with them via the driver 360. A switch 350 (Fig. 13) for the motor 9 is switched on by the fast winding rods 37, 39. The motor 9 starts.

The locking tab 306 lies with its ejection lever edge against the locking cam 307 of the cam lever. The locking tab 306, which extends with the ejection rod 302, pivots the

PHD90-179 39

The cam lever 305 then continues to rotate clockwise. Because the spring 40 pushes the eject rod 302 over the fast winding rods 37, 39, the spring 40 now turns the cassette lever 310 to the end of the retraction as part of the power transmission. The cassette 200 is thus retracted.

When the eject rod 302 extends, the catch lever 162 also extends. The catch lever 162 moves away from the pressure tab 370 and becomes free. The catch lever spring 163 now turns the catch lever clockwise, causing the play recess 162a to move into a position in which it can lock the head plate 21 in the play position.

Via a not shown guide, the cassette slot 3 21 is pivoted clockwise into the lowered position shown in Fig. 12c, whereby the magnetic tape cassette 200 is placed on the winding mandrels 330.

When the fast winding rods 37, 39 are extended together, the motor 9 is switched on via the switch 350, by closing both contact pairs 351a, 351b and 352a, 352b. This also causes the sound shafts 13a, 13b to start. The drag wheel 157 then pulls the drag lever 150 together with the head plate 21 into the playing position in the manner described. The catch lever 162 locks the head plate in the play position. Play can begin.

Ejection process

To end the drive operation by ejecting the magnetic tape cassette 200, the eject rod 302 is fully pressed in. The cassette slot 321 pivots into the eject position according to Fig. 12a by means of the guide rail (not shown). In doing so, driven along by the driver

EHD* 90-179 40

360, the two fast-winding button rods 37, 39 also move into the drive. Since the catch lever 162 moves in via its axis 162c, which is mounted on the catch lever tab 303, it releases the cam 155 of the head plate 21; the head plate 21 is released. Before this release, the fast-winding rods 37, 39 on the switch 350 (Fig. 9a) opened both contact sets 351a, b, 352a, b. The motor has stopped. The head plate 21, released by the catch lever 162, moves into the start-up or eject position.

When the eject rod 302 is pressed in, the locking tab 306 leaves the locking cam 307. This allows the cam lever 305 to be pivoted anti-clockwise. This pivoting is carried out via the cam tab 304, which abuts against the locking cam 307 on the cam lever 305. The cam lever 305 turns the cassette lever clockwise via the pivot pin 364 engaging in its groove 365. The driver 368 of the cassette lever pushes the cassette 200 outwards together with the nose 362, which abuts against the cassette front wall 200c. In the removal position, the cassette driver 368 is moved out of the area of the support on the cassette slot and is therefore no longer locked. The ejection process is now complete and the cassette can be removed.

The cam 371 of the catch lever 162 hits the pressure tab 370 of the cam lever 305 shortly before the cassette ejection mechanism reaches the eject position. This causes the catch lever 162 to rotate slightly counterclockwise against the force of the catch lever spring 163. The cam lever 305 and the cassette lever 310 are thus pre-tensioned in the ejection direction.

PhD 90-179

Electrical drive switch

Fig. 13 shows the switch 350 arranged in the area of the key rods 37, 39 with contact pairs 351a, 351b and 352a, 352b that spring towards each other. The switch is actuated by switching cams 353a and 353b, which are attached to the spring arms 351, 352 that carry the contacts 351a, b and 352a, b. The switch 350 is actuated by actuating cams 37a, 37b, 39a and 39b attached to the quick-action rods 37, 39. These are arranged offset from each other so that

a) when the key rods 37, 38 of both contact pairs 351a, b and 352a, b are opened when they are retracted to the same extent,

b) when the key rods 37, 39 are extended, both contact pairs 351a, b and 352a, b are closed, c) when one key rod 37 or 39 is retracted, one of the contact pairs is closed and the other is open,

d) when one or both key rods 37, 39 are pressed lightly, both contact pairs are opened.

If both fast-winding rods 37, 39 are retracted, for example because the eject rod 302 took them with it when it was pushed in, then both contact pairs 351a,b and 352a,b are open and the motor 9 is switched off when the cassette is ejected. The same applies to the standby position, in which both fast-winding rods 37, 39 are switched on, but the ejecting rod is not. If all button rods 37, 39, 302 are extended, then the switch is closed by means of both contact pairs 351a,b and 352a,b and the motor 9 is switched on. Depending on which fast-winding rod 37 or 39 is pressed on its own, one or the other contact pair 351a,b closes as the insertion movement continues.

PHD90-179 42

or 352a,b. This makes it possible to electrically identify which button has been pressed. The respective quick-return function can thus be made visible on a display. In the manual standby function, both contact pairs 351a,b and 352a,b are open.

If only one or both button rods 37, 39 are pressed in slightly at the same time, the drive motor 9 is switched off. Such incorrect operation therefore has no negative consequences.

Manual reversing

Without adjusting the head plate 21, it is possible to reverse the direction of play both at the end of the tape and, if desired, by means of a so-called manual reverse. The reversal of direction at the end of the tape was already explained in the transition from Fig. 3 to Fig. 4 using the additional Figs. 7, 7a and 7b. The manual reverse works as follows:

For manual reversing, the eject button rod 302 is pushed in a little over the eject button 301. The reversing claw 312 moves the pin 313 from the inlet track 314c over a first ramp 380 into a first recessed area 381 located behind this ramp 380 (Fig. 11). When pushed in, the pin 313 reaches a maximum of a second ramp 382, from which it runs back into the first recessed area 381. If the eject button 302 is now released, the pin 313 runs back into the inlet track 314c in the return track 314a. During this return movement in the first return path 314a, the pin 313 strikes a support surface 383 of a reversing lever 384, which can be pivoted about a reversing lever axis 385 mounted in the chassis 3.

PHD90-179 43

The reversing lever 384 is designed with multiple arms. The setting surface 383 is located on a first reversing arm 384a. The second reversing arm 384b carries an adjusting pin (Fig. 1 and 14). The adjusting pin 388 interacts with a stop 389 of the adjusting element 77 in such a way that the movement space of the adjusting element 77 is restricted.

If the pin 313 runs onto the setting surface 383 of the reversing lever 384, it swings the reversing lever 384 clockwise and the setting pin 388 engages in a notch 390a in the spring 390. The setting pin 388 has thereby swung the setting element 77 anti-clockwise via the arm 389a. This resulted in the button 83 running onto the control surface 84 of the control element 77, initiating and executing the direction reversal process. The control element 77 is forcibly rotated clockwise by a return wall 79a of the switching wheel 79. The locking of the hook 388a is released as the stop 389 tears the setting pin 388 out of the notch 390a. A return spring 391 turns the reversing lever 384 counterclockwise back against a stop 392 in the chassis. The game now continues in the reverse direction.

If the ejection rod 302 is pushed in completely to eject the cassette, the pin falls into a second recessed area 381a after traveling over the highest point of the second ramp 382. The pin 313 stops there, all button rods 37, 39, 302 are retracted, the cassette lever 310 has ejected the cassette, and the motor 9 is at a standstill. If a cassette 200 is pushed in again, the ejection rod 302 extends again. The pin 313 can now only return to the beginning 314c of the infeed track via the second return track 314b, and the direction reversal is not activated.

PhD 90-179

Manual standby

For manual standby, both fast-wind buttons 33, 35 and the corresponding fast-wind rods 37, 39
inserted together. During this insertion,
both contact pairs 351a, b; 352a, b of switch 350
opened. This stops the motor 9. The head plate 21 is released by pushing projections 401a, b of the fast winding rods 37, 39 (Fig. 1 and 3) against a pin 164 on
the catch lever 162 (Fig. 8a) and opposite
the cam 155 in an anti-clockwise direction and the action of the spring 163. The pivoting movement is
the fast winding position, because a catch lever cam 371 hits the guide edges 37e, 39e of the fast winding rod 37, 39. In this position, the catch lever 162 is between the lugs 401a, b and the guide edges
37e, 39e is blocked against pivoting. The falling head plate 21 remains with the cam 155 on the quick

spool trough 162b of the catch lever (Fig. 8c). Due to the falling off of the head plate 21, the forming cam 207 of the reversing plate 87 leaves the adjusting edges 211a or 211b of the
Pressure roller bracket 203. Both pressure rollers 202a or
202b are therefore separated from the sound waves 13a and 13b.

the stand-by position is reached, in which both

Fast winding rods 37, 39 pressed in by the latch 131
are locked in place. By pressing the eject rod 302
over a relatively short displacement distance, during which the pin 313 the first recessed area 381a (Fig. 11)

not yet reached, the manual standby is released,
by a contour 410 on the multi-function tab 308, the
Latch 131 is pressed into the unlocking position via its release pin 138. The button rods 37, 39 thus extend and the switch 350 is closed again. The motor starts.

The guide edges 37e, 39e release the catch lever 162,

PhD 90-179

so that it can swivel over its entire swivel range. The restoring force of the head plate spring 21f pulls the cam 155 out of the fast-winding recess 162. The catch lever 162 gives way by swiveling away in an anti-clockwise direction. The head plate 21 moves back into the eject position. The previously described start-up now takes place with the motor-driven pulling of the head plate 21 into the play position via the drag lever 150. 10

Fast winding

In order to be able to carry out the fast winding process, which has already been described in connection with Fig. 2, 3, 5 and 6, the head plate 21 must be moved back into its fast winding position. To initiate a fast winding process, one of the fast winding buttons 37 or 39 is pressed in (as already explained). The catch lever 162 is thereby pivoted anti-clockwise against the action of the spring 163 by one of the lugs 401a or b on the respective fast winding rod 37 or 39, which moves against the pin 164. The guide edge 37e or 39e of the inserted fast winding rod or 39 blocks the pivoting movement of the catch lever when the fast winding position is reached.

By inserting the desired fast-winding rod 37, 39, the central shift lever 43 was pushed downwards via the second shift lever 48 and pivoted slightly. This switched the gear from play to fast-winding operation according to the desired fast-winding direction.

By inserting the non-inserted

2?HD 90-179 46

When the quick-wind rod is released, the previously locked quick-wind rod is unlocked and extends. The guide edge 37e or 39e releases the catch lever 162 so that it can rotate over its entire pivoting range. The restoring force of the head plate spring 21f pulls the cam 155 out of the quick-wind recess 162b, and the head plate 21 moves back into the start-up or eject position, from which, as described, the start-up into play mode takes place immediately.
10

Preferred playing direction after inserting a cassette

The drive is equipped with a device that ensures that the start-up always takes place in the normal playing direction after each new insertion of a cassette into the empty cassette slot 321, i.e. when the cassette has been completely removed from the cassette slot 321 after being ejected. If the cassette 200 remained in the slot 321 and is completely inserted again to start up again, the drive continues to play in the direction it was previously playing.

Fig. 15a and 15b show the operation of this device. It includes a cassette sensing lever 501, which can be pivoted about a chassis-fixed key lever bearing 501a. The cassette sensing lever 501 has a first sensing arm 501b and a second sensing arm 501c. The first sensing arm 501b carries a sensing pin 501d. The sensing pin 501d is arranged in such a way that an inserted magnetic tape cassette 200 pushes it aside, causing the cassette sensing lever 501 to pivot clockwise.

A spring 502 acts on the cassette trigger lever 501, which tends to rotate it counterclockwise.

BHD 90-179

This is only possible if no cassette 200 is inserted. An actuator 503 is provided which is equipped with a spring arm 503a on which there is a spring arm hook 503b which can hook behind a chassis nose 504. The actuator 503 also carries an adjusting pin 101c which is located between the legs 107a, b of the return spring 107.

An ejection spring 506 acts on the actuator 503, which tends to press the actuator 503 against the sensing arm 501c and to pivot it clockwise. However, this is only possible if the spring arm hook 503b is disengaged from the chassis nose 504 and there is no cassette in the cassette slot 321. The spring 506 then pushes the actuator 503 to the left and the cassette sensing lever 501 pivots clockwise.

It is now assumed that the drive is in the reverse playback position according to Fig. 1 and Fig. 15b. There is no cassette 200 in the cassette slot 321. The cassette sensing lever is therefore pivoted anti-clockwise and the sensing pin 501d reaches into the empty cassette slot 321.

During the previous playback process, the spring arm hook 503b had become caught behind the chassis nose 504. As a result, the actuator 503, locked by the chassis cam 504 and the spring arm hook 503b, is in the position shifted to the right. The return spring 107 is pivoted clockwise by the bearing pin 101c, which has been shifted to the right and acts on the leg 107b. The leg 107a has shifted the transport rod 98 to the right via the driver. The rack section 98b is in engagement with the flywheel gear 47b.

PHD90-179 48

As long as no cassette 200 is inserted into the drive, the drive motor 9 is stationary. The engagement of the rack section 98b and the flywheel gear 47b has therefore only led to a positive connection, but not to any further movement. If a cassette 200 is now inserted into the drive, whereby the cassette sensing lever 501 pivots clockwise and loses contact with the actuator, the motor 9 starts up. The flywheel gear 47b pulls the transport rod to the right. The driver 100a presses against the edge 87d of the reversing plate 87 and pivots it from the reverse play position towards the forward play position. This starts the direction reversal process, in which the central switching lever 43 is moved from the reverse position (Fig. 1 to 3) to the forward position (Fig. 4 to 6).

Parallel to the reversing process, in which the central shift lever 43 pivots anti-clockwise, the clutch double wheel 46a,b pivots anti-clockwise with the central shift lever 43 and hits the spring arm 503a. This gives way, and the spring arm hook 503b is pushed away from the locking position behind the chassis nose 504 during this evasive process. The actuator 503, which was locked in the position pushed to the right until then, is now pushed to the left by the return spring 506. This restores contact between the cassette trigger lever 501 and the actuator 503. The bearing pin 101c removes its biasing force on the leg 107b, and the leg 107b pushes the transport rod 98 back to its center position in the manner described in the reversing mechanism section in connection with Fig. 7a to 7c.

90-179 49

When the reversing movement is complete, the drive is in the forward play position. The inserted cassette is therefore played in the forward play position.
5

If, during an ejection process in which the drive is in the forward playback position according to Fig. 15a, a magnetic tape cassette 200 is pushed out of the drive and completely removed, then the spring 502 pivots the cassette sensing lever 501 anti-clockwise and the sensing pin 501d pivots into the empty cassette slot 3 21. During this pivoting, which is equivalent to a query of the drive as to the presence or absence of an inserted cassette, the second sensing arm 501c moves the actuator 503 parallel to the direction of movement of the transport rod 98. With the actuator 503, the spring arm 503a, at the end of which the spring arm hook 503b is located, moves behind the chassis nose 504 of the chassis and locks.

In this position according to Fig. 15a, the reversing plate 87 is in the position for forward play operation. The bearing pin 101c has displaced the leg 107b of the return spring 107 clockwise and pre-tensioned it in the process. The driver 100b lies in a recess 505 of the reversing plate 87. This means that the transport rod 98 is fixed in the position shown in Fig. 15a and the rack 98b cannot engage with the flywheel gear 47b. There can therefore be no unnecessary adjustment of the transport rod 98 in the operating case in which the reversing plate 87 is already in the forward play position with the cassette 200 pushed out and the cassette slot empty. The driver 98d of the

?HD 90-179 bO

The transport bar remains in place; only the legs 107a, b spread apart.

If a cassette is now inserted into the empty cassette slot 321 with the drive switched to forward play mode, then this cassette 200 pushes the first feeler arm 501b aside in a clockwise direction via the feeler pin 501d. However, the ejection spring 506 cannot be effective in pushing the actuator 503 out in the direction of the second feeler arm 501c because the spring arm hook 503b remains hooked behind the nose 504. So if a cassette 200 is inserted again, then the play mode begins as desired in the forward play direction, as it had previously ended.

Fig. 15a and 15b both show the restart direction of the drive after a cassette 200 has been completely removed. If this cassette 200 was not removed, i.e. it remained in the slot, then the cassette lever 501 could not carry out any movements and could not transmit any movements to the actuator 503. This means that when the device is restarted with the cassette 200 remaining in the cassette slot, the drive always starts up again in the last direction played.

Claims (7)

PHD 90-179 51 PROTECTION CLAIMS 1. Magnetic tape cassette device with a drive which has winding plates (17) with which a magnetic tape can be wound between winding cores within a magnetic tape cassette (200), wherein a loading mechanism has a cassette slot (321) and is set up to raise the magnetic tape cassette (200) located in the cassette slot (321) into an ejection position and to lower the magnetic tape cassette (200) into a playing position in which the winding cores (330) are placed on winding mandrels (330), wherein a pivoting mechanism is provided which cooperates with a cassette lever (310) which is pivoted by an inserted cassette (200) with the aid of a driver displaced by the cassette in the insertion direction and by an ejection rod (302) in the ejection direction, characterized in that the cassette lever (310) can be rotated about a virtual point which is so far away from the cassette driver (368) for the cassette (200) that the circular arc of the cassette driver movement when pushing the cassette in and out becomes so large that the cassette driver (368) is not obstructed in the winding hole (369) of the cassette transversely to the direction of movement of the cassette, wherein the cassette lever (310) has a circular arc-shaped guide element (367) with a circular arc center point (363) which forms a virtual axis of rotation for the cassette lever (310) outside of the cassette lever (310), wherein fixed guide means (366) cooperate with the circular arc-shaped guide element (367), on which the cassette lever (310) can be rotated about the virtual axis of rotation, wherein the cassette driver (368) is mounted on the cassette lever (310) as a vertically spring-loaded lever component is formed, PHD90-179 52 which can be lowered and raised relative to the cassette (200) for falling into and lifting out of the hole (369) of a winding core (361), and wherein the cassette lever (31c) is provided with a nose (362) against which a cassette (200) strikes at the beginning of its insertion and thus pivots the cassette lever until the spring action of the cassette driver (368) is prevented and the cassette driver can pull the cassette in. 2. Magnetic tape cassette device according to claim 1, characterized in that the circular arc-shaped guide element (367) is a groove of the cassette lever (310) into which the guide means engage as stationary pins (366). 3. Magnetic tape cassette device according to claim 1, characterized in that the nose (362) of the cassette lever (310) cooperates with the driving edge (200b) of the magnetic tape cassette located at the front in the insertion direction, in that the magnetic tape cassette (200) rotates the cassette lever in the insertion direction up to the automatic insertion point when inserted. 4. Magnetic tape cassette device according to claim 1, characterized in that the housing of the drive is provided with a support which is located so just above the cassette driver (368) over the insertion path of the cassette (200), in which the cassette driver (368) must remain sunk into the hole (369) of the winding core (361), that the cassette driver (368) is forced to remain in the hole. 5. Magnetic tape cassette device according to claim 1, characterized in that a pivot pin (364) of the cassette lever (310) engages in a cam lever groove (365) which is rotatable about a fixed pivot point (305a). PHD90-179 53 A cam lever (305) is provided which forms an intermediate link between the cassette lever (310) and the ejection rod (302) and whose direction of rotation always runs opposite to the direction of rotation of the cassette lever (302). 5 6. Magnetic tape cassette device according to claim 1 with at least one fast winding rod (37/39) which can be brought into its functional position against spring force, in which it is locked, and which, when inserted, causes the magnetic tape (153) to run quickly between the winding cores (330) of the magnetic tape cassette (200), characterized in that a driver (360) is provided on the ejection rod (302) which couples the ejection rod (302) to the fast winding rod (37/39) in such a way that the ejection rod (302) when inserted, the fast winding rod (37/39) pulls it in and that when a cassette (200) is inserted, the fast winding rod (37/39) which is released also pushes out the ejector rod (302). 7. Magnetic tape cassette device according to claim 6, characterized in that the spring-loaded, extending fast winding rod (37/39) pivots the cam lever (305) via the entrained extending ejection rod (302) in such a way that the cassette lever (310) hinged to the cam lever (305) is automatically pivoted further in the retraction direction by the spring force loading the fast winding rod (37/39) in the outward direction until the magnetic tape cassette (200) is completely retracted.