Mode changing mechanism for tape recording and/or reproducing apparatus

Abstract: To enable simple and accurate positional adjustment of the various tape loading and driving elements of a cassette tape recording and/or reproducer, a single mode changing slider 20 controls respective displacements of moveable members of a reel base driving mechanism, a pinch-­ roller transferring mechanism, a brake operating mechanism, a back-tension exerting mechanism, a tape loading mechanism and so forth, which displacements are required whenever an optional mode of the apparatus is selected.

Description: This invention relates to a mode changing mechanism for tape recording and/or reproducing apparatus, and particularly, but not exclusively, to a mode changing mechanism for a rotary-head-type digital audio tape player (R-DAT), or a video tape recorder (VTR), which has a tape loading device by which a tape is drawn out from a mounted tape cassette so as to enable the tape to run along a predetermined tape running path. Generally, an apparatus, such as an R-DAT or a VTR, is equipped with a reel base driving member (eg as disclosed in JP-A-61-8756) for selectively driving either of the pair of reel bases of the cassette, a pinch-roller transferring member for transferring a pinch-roller to a selected one of a plurality of predetermined positions, a brake operating member which is operated to selectively arrest one or both of the reel bases, a back-tension exerting member for selectively exerting a back tension on one of the reel bases, a tape loading member (eg as disclosed in JP-A-61-187155) for selectively loading or unloading the tape, etc. Different operating modes can be selected by setting the respective members to pertinent positions. Such members usually are organised into several groups, and driven by a single motor and a plurality of drive mechanisms to connect the motor to the respective members in every group. However, even among members belonging to the same group, there are generally certain differences in timings for moving the respective members, strokes or moving directions of the respective members, or the like, so that it is necessary to interpose cam means and speed changing means between the motor and each of the drive mechanisms, and further, to provide detecting means for detecting the positions of the respective members and the moved elements of the respective drive mechanisms. As a result, the apparatus becomes complicated in structure, the manufacturing cost rises, and it is difficult to miniaturise the apparatus. Moreover, it becomes necessary to assemble the apparatus so that there is no phase shift between the drive mechanism and the members which have a closer relation with tape running, and such painstaking assembly requires much time. If there is a phase shift between the drive mechanism and the tape handling members, for example, the tape handling members do not correctly come to their predetermined pertinent positions when the apparatus is operated so as to select an optional mode, the apparatus will malfunction. Accordingly, it is an object of the present invention to provide a tape recording and/or reproducing apparatus in which the tape loading member, the pinch-roller transferring member, the brake operating member, the reel base driving member and possibly other members are correctly moved to the respective predetermined positions, according to the selected operating mode. In accordance with an aspect of this invention, there is provided a mode changing mechanism for a tape cassette recording and/or reproducing apparatus including: rotary head drum means for recording information on and/or reproducing information from a magnetic tape; a capstan for driving the tape past the rotary head drum means, pinch-roller transferring means, including a rotatably supported pinch roller, for pressing the pinch-roller against the capstan; a pair of reel bases capable of being engaged with a pair of tape reels which are accommodated in a tape cassette loaded into the tape cassette recorder and/or reproducing apparatus, and on which reels the magnetic tape is wound; tape loading means for drawing out the magnetic tape from the tape cassette and leading the tape to a predetermined tape path including the periphery of the rotary head drum means; a tape reel drive motor; reel base driving means for selectively imparting torque from the tape reel drive motor to either of the pair of reel bases; control means for controlling the action of the reel base driving means and brake operating means for braking the pair of reel bases under predetermined conditions; wherein the mode changing mechanism comprises: a) mode changing means, including a mode changing slider moveable in parallel with a line passing through the centres of the pair of reel bases, integral first regulatory drive means for driving the tape loading means under a first set of predetermined conditions, second regulatory drive means for driving the pinch-roller transferring means under a second set of predetermined conditions, third regulatory drive means for driving the control means under a third set of predetermined conditions, and fourth regulatory drive means for driving the brake operating means under a fourth set of predetermined conditions; and b) slider driving means for driving the mode changing slider in accordance with a selected one of a plurality of modes, each mode corresponding to a different combination of the first to fourth sets of predetermined conditions. The mode changing slider is preferably moved in parallel with a line passing through the centres of the pair of reel bases so as to be locked in a first mode position where at least the tape cassette can be ejected, in a second mode position where tape loading is completed with the help of the tape loading means, in a third position where a fast forward/rewind (FF/REW) mode is established, in a fourth position where a forward-playback/record (FWD/PBREC) mode is established, and in a fifth position where a reverse-playback (REV-PB) mode is established. The tape loading means preferably comprises a chassis and the reel base driving means comprises a plurality of gears and swingable arm which rotatably supports a first gear of the plurality of gears to enable it to be selectively engaged with either one of the reel bases so as to impart a torque thereto in a forward/reverse (FWD/REV) mode, and a swingable lever which rotatably supports a plurality of the gears to enable a different one of them to be selectively engaged with a different one of the reel bases so as to impart the torque thereto in a fast forward/rewind (FF/REW) mode. The reel base driving means may include an auxiliary slider moveable to a first mode through fifth mode positions in a direction perpendicular to the movement of the mode changing slider so as to locate the swingable arm in a FWD position, in a neutral position, or in a REV position, and locate the swingable lever in a locking position or in a releasing position. The swingable arm used for establishing the FEW/REV mode is held in a neutral position, with first gear unengaged with either of the reel bases, while the auxiliary slider is moved from the first mode position to the third mode position through the second mode position; moved to a position for establishing the FWD mode when the auxiliary slider is moved from the third mode position to the fourth mode position; and moved to a position for establishing the REV mode when the auxiliary slider is moved from the fourth mode position to the fifth mode position. The invention will be further described by way of non-limitative example with reference to the accompanying drawings, in which:- Figures 1A to 1D are a chain of diagrammatic plan views, omitting certain structural portions, eg, the chassis for purposes of clarity, and which illustrate the results of a series of mode changes, performed in order, of a rotary-head-type digital audio tape player (R-DAT) according to an embodiment of this invention; Figure 2 is a complete plan view of the player of figures 1A to 1D at the time of an initial mode; Figure 3 is a front elevation of the player of Figure 2, with a tape cassette being mounted therein; Figure 4 is a perspective view of a principal part of the player of Figure 2; Figure 5 is an exploded, perspective view with portions broken away and in section, of a pinch-roller device incorporated in the player of Figure 2; Figure 6 is a horizontal sectional view, taken generally along the line VI-VI in Figure 3, of the player; Figure 7 is an exploded, fragmentary perspective view of the portion of the player depicted in Figure 6; Figure 8 is an exploded, perspective view of a tape loading device and a mode changing slider incorporated in the player of Figure 2; Figure 9 is a sectional view taken generally along the line IX-IX on Figure 2, with portions broken away; Figure 10 is a sectional view taken along the line X-X on Figure 2, with portions broken away; Figure 11 is a graphical representation of the timing of the various members' positional relationships present in the player of Figure 1. Referring to the accompanying drawings which illustrate a digital audio tape player (R-DAT) embodying this invention, and initially to Figure 4 thereof, a chassis 2 and an auxiliary chassis 3 positioned below the chassis 2 are parallel to each other, and one end of the chassis 2 is vertically flush with one end of the auxiliary chassis 3, as viewed in the figure. A pair of spindles 4 vertically project from the auxiliary chassis 3 (Figure 7) through the chassis 2, and are loosely fitted, respectively into a supply reel base 5 and a take-up reel base 5'. Each reel base 5, 5' has, respectively, a large driven gear 5 a , 5' a used when recording or reproducing, a small driven gear 5 b , 5' b used when the reel base 5, 5' is rotated at high speed, a brake drum 5 c , 5' c and a reel engaging shaft 5 d , 5' d . As shown in Figure 4, the upper portion of the reel base 5, 5' that is substantially higher than the middle portion of the brake drum 5 c , 5' c protrudes from an opening 2a which is provided in the chassis 2. A head drum 6 arranged on the upper side of the chassis 2 comprises a lower drum 6 a fixed to the chassis 2, an upper drum 6 b rotatably supported by the lower drum 6, and a rotary magnetic head 6 c which projects a little from a slit formed between the upper drum 6 b and the lower drum 6 a , and can rotate together with the upper drum 6 b . Reference numerals 7 and 8 denote stationary tape guides that are fixed to the chassis 2, and reference numeral 9 denote pins projecting from the upper surface of the chassis 2 for positioning a tape cassette 10 when the tape cassette is mounted on the player. A capstan 17 protruding from the chassis 2 is protected by, and rotatably supported, at the top thereof, by a capstan housing 16 which is fixed to the chassis 2. The capstan housing 16 has an opening 16 a . As shown in Figure 10, the capstan housing 16 extends downwards through the chassis 2. The case of a capstan motor 18 is fixed to the bottom of the housing 16. The capstan 17 is driven by the capstan motor 18. A driving pulley 19 is secured to the lower end of the capstan 17. As indicated by two-dots-and-dash lines in Figure 2, and as shown in Figure 10, the tape cassette 10 has a lid 13 at a front side 12 thereof, which faces the head drum 6 when the tape cassette 10 is mounted on the player. At each end of the front side 12 of the tape cassette 10, there are openings 12 a to draw out a magnetic tape 15. Between the two openings 12 a , there is a recess 12 b (Figure 2). Before the tape cassette 10 is mounted on the player, a part of the tape 15 that is outside of the tape cassette 10 is in a state of being stretched along the front side 12 of the tape cassette 10. Within the tape cassette 10, the tape 15 is in a state of being wound around a pair of tape reels 14 and 14' (Figure 2). Part of the tape 15 and the front side 12 of the tape cassette 10 are covered with the lid 13. The mode changing slider 20 is constituted of substantially a rectangular frame, as shown in Figure 8, and made of synthetic resin. Three slots 24 are provided at three corners of the frame. The slider 20 is slidably supported by three, grooved, guide pins 33 which project from the auxiliary chassis 3, as shown in Figure 3, and are fitted into the respective slots 24. As best shown in Figures 5 and 8, an opening 25 is provided in the corner of the slider 20 which does not have a slot 24. The side faces of the opening 25 partially form cam faces 25 a to 25 d , which are followed by a cam follower 60, to control the motion of a pinch-roller 58. The slider 20 has a large, interior cut-out portion 21 which divides the slider 20 into spaced apart, parallel, longitudinal members 22 and 23. A first cam face 26 for controlling the positions of an auxiliary slider 42 (hereinafter described), and a second cam face 27 for controlling a device, which is provided to give a back tension to the magnetic tape 15, are formed in the outer side of the longitudinal member 22 of the slider 20 (which lies in the lower side in Figure 8). As shown in Figure 6 and 7, a cam follower 48 projecting from the auxiliary slider 42 follows the cam face 26, and as shown in the lower left corner of Figure 2 and in Figure 3, a cam follower 81 b projecting from a lever 81 of the device follows the cam face 27. As shown in Figure 8, other cam faces 28 and 28 a for controlling another device, which is provided to give a back tension to the magnetic tape 15, are formed in the inner side of the first longitudinal member 22 (which faces the space 21 formed within the slider 20), and as shown in Figures 6 and 7, a cam follower 82 b projecting from a lever 82 of the device follows the cam faces 28 and 28 a . To brake the reel bases 5 and 5', a braking device is provided. As shown in Figure 8, a further cam face 29 for controlling the braking device is formed in the outer side edge of the first longitudinal member 22 of the slider 20. The cam face 29 extends over a range of substantially half the length of the first cam face 26, just below the first cam face 26 which controls the position of the auxiliary slider 42. As shown in Figure 7, a cam follower 76 c projecting from one of two brake levers 76 and 77 of the braking device follows the cam face 29. Again, as shown in Figure 8, portions of the racks 30 are disposed on the outside edge of the second longitudinal member 23 of the slider 20. The two racks 30 (which lie near the left side of the slider 20 in Figure 8) are spaced away from each other by a predetermined distance. Above the upper side of the rack 30, there is provided a recess 31. The two racks 30 are engaged with respective pinions incorporated in a tape loading mechanism 62. Another rack 32 is provided on the lower side of the slider 20 adjacent the edge of the longitudinal member 23 which faces the opening 21. The rack 32 is engaged with a reduction gear means 40 (Figures 3, 7) which transmits the torque of a motor 35 to the slider 20. The pair of reel bases 5 and 5' project within the space 21 of the slider 20. A slider transmitting mechanism is comprised of the motor 35 fixed to one end of the chassis 2 as shown in Figure 2, a driving pulley 36 fixed to the shaft of the motor 35, a driven pulley 38 (Figure 3) supported by the auxiliary chassis 3, a belt 41 looped between the driving pulley 36 and the driven pulley 38, a worm gear 37 which is rotatably secured to the auxiliary chassis 3 and to which the motor torque is transmitted through the driven pulley 38, as shown in Figures 6 and 7, a worm wheel 39 rotatably secured to the auxiliary chassis 3, and engaged with the worm gear 37, and the reduction gear means 40. It is noted that the reduction gear means 40 comprises a large gear 40 a engaged with a small gear 39 a which is formed integral with the worm wheel 39, and a small gear 40 b engaged with the rack 32 of the slider 20. The mode changing slider 20 moves among five predetermined positions: a first position shown in Figures 2 and 6, where at least the tape cassette 10 can be ejected, a second position shown in Figure 1A, where tape loading operation is completed, a third position shown in Figure 1B, where the magnetic tape 15 can be run at high speed, a fourth position shown in Figure 1C, Where the magnetic tape 15 can be run in a normal direction thereof, and a fifth position shown in Figure 1D, where the magnetic tape 15 can be run in a reverse direction. It is noted that the distance between the second position (Figure 1A) and the third position (Figure 1B) of the slider 20 is the same as the distance between the third position and the fourth position (Figure 1C), the distance between the first position ( Figure 6) and the second position (Figure 1A) is five times as large as the distance between the second position and the third position. The distance between the fourth position (Figure 1C) and the fifth position (Figure 1D) is one and a half times as large as the distance between the second position and the third position. Further, a detector (not shown) is secured to the lower side of the chassis 2 so as to detect the position of the slider 20. The auxiliary slider 42 is constituted by a narrow rectangular plate as shown in Figure 7 and three slots 45 are provided at three corners of the plate 42. The auxiliary slider 42 is slidably supported by three guide pins 50 which project from the auxiliary chassis 3 as shown in Figure 3, and are fitted into the respective slots 45. Thus, the auxiliary slider 42 is movable in a direction perpendicular to the travelling direction of the slider 20 just under the slider 20 as shown in Figure 3. Further, as shown in Figure 7, a tension spring 51 is stretched between spring anchors 49 and 49' which project from the auxiliary slider 42 and the auxiliary chassis 3, respectively, so that the cam follower 48 of the auxiliary slider 42 is always pressed against the first cam face 26 of the slider as shown in Figures 6 and 1A to 1D. As shown in Figure 7, the auxiliary slider 42 has a cam groove 46 and a restraining hole 47. The cam groove 46 is followed by a cam follower 94 c projecting from an arm 94 which is rotatably secured to the auxiliary chassis 3. Further, to the free end of the arm 94, a swingable gear 96 is rotatably secured. The cam groove 46 comprises a first portion 46 a which is parallel to the longitudinal axis of the auxiliary slider 42, a second portion 46 b which is aslant of the axial direction, and a third portion 46c which is aslant of the axial direction in a direction opposite to the second portion 46b. Thus, when the cam follower 94 c is in the first portion 46 a of the cam groove 46 as shown in Figures 6, 1A or 10, the swingable gear 96 is in a neutral position thereof so as to engage with neither of the large driven gears 5 a and 5' a . When the cam follower 94c is in the second position 46 b or in the third position 46 c as shown in Figure 1C or 1D, the swingable gear 96 engages with the large driven gear 5 a or 5' a , respectively. The restraining hole 47 is provided to restrain a projection 97 b projecting from a lever 97 (Figure 7), which is rotatably secured to the auxiliary chassis 3. Further, to the opposite end of the lever 97, swingable gears 98 and 98' are rotatably secured. When the projection 97 b is in a wide portion 47 a of the restraining hole 47, as shown in Figures 6, 1A or 1B, the projection 97 b is not restrained by the restraining hole 47, so that it is possible to engage the swingable gear 98 with the small driven gear 5 b of the supply reel base 5, or to engage the swingable gear 98' with the small driven gear 5' b of the takeup reel base 5'. When the projection 97 b is in a narrow portion 47 b of the restraining hole 47, as shown in Figure 1C or 1D, the projection 97 b is restrained from moving in the width direction of the restraining hole 47, so that neither of the swingable gears 98 and 98' can engage with the respective small driven gears 5 b and 5' b . As shown in Figure 7, the auxiliary slider 42 has a pair of symmetrical cam faces 80 a and 80 b at one end 80 thereof. The cam follower 48 projects upwards from the end 80 of the slider and between the cam faces 80 a and 80 b . The cam faces 80 a and 80 b are followed by cam followers 76 d and 77 c , for example, as illustrated in Figure 1D. The cam followers 76 d and 77 c project from respective brake levers 76 and 77 (hereinafter described). As shown in Figures 6 and 7, intermediate gears 93 rotatably supported by a shaft 92, which projects from the auxiliary chassis 3, comprise a large gear 93 a and a small gear 93 b . The small gear 93 b is engaged with the swingable gear 96 and a driving gear 90. As shown in Figure 9, the driving gear 90 is fixed to the top of a shaft 88 rotatably supported by a sleeve 87, which is fixed to the auxiliary chassis 3, and to the bottom of the shaft 88, a driven pulley 89 is fixed. A belt 91 is looped between the driven pulley 89 and the driving pulley 19 (Figures 3, 10), so that the torque of the capstan motor 18 is transmitted to the small driven gear 5 b or to the small driven gear 5' b through the driving pulley 19, the driven pulley 89, the driving gear 90, the small gear 93 b of the intermediate gear 93, and the swingable gear 96 in the order of mention. It is noted that the arm 94 is a narrow plate. A sleeve 94 a extends downwards from the proximal end of the arm 94 and is engaged with a shaft 95 projecting from the auxiliary chassis 3. The swingable gear 96 is rotatably suspended by a shaft 94 b projecting downwards from the free end of the arm 94. As best shown in Figures 6 and 7, the lever 97 is a crooked plate, and the center of the lever 97 is rotatably supported by a cylindrical projection 93 c projecting upwards from the center of the intermediate gears 93. The respective swingable gears 98 and 98' are rotatably suspended by shafts 97 a extending downwards from each end of the lever 97, and always engaged with the large gear 93 a of the intermediate gears 93. Further, friction plates 99 made of felt or the like are interposed between each of the swingable gears 98, 98' and the lever 97. Thus, the torque of the capstan motor 18 transmitted to the large gear 93 a of the intermediate gears 93 can be transmitted to the small driven gear 5 b of the supply reel base 5, or the small driven gear 5' b of the take-up reel base 5' through the swingable gear 98 or 98', respectively. As shown in Figure 5, the pinch-roller transferring levers 52 comprise a substantially U-shaped, first lever 53 and a substantially L-shaped, second lever 54. The fulcrum of the first lever 53 is at one end thereof, a tape guide 59 projects from the other end, and a pin 57, on which a pinch-roller 58 is rotatable, projects from a position spaced a little away from the tape guide 59. Further, a spring anchor 53 a and a hook 53 b , which are spaced a little apart from each other, project substantially from an intermediate portion of the outer side of the first lever 53. The second lever 54 has the fulcrum thereof substantially in an intermediate position of one of two elements which form the L-shape. The fulcrums of the levers 53 and 54 are axially aligned and, as will be described further herein, have a common fulcrum pin 55. The cam follower 60, which follows the cam faces 25 a to 25 d provided in the mode changing slider 20, projects downwards from the end of the fulcrumed element of the second lever 54. At the other end of the lever 54, there is a spring anchor 54 a . As shown in Figure 2, after the first lever 53 is laid top of the second lever 54, and rotatably supported by a common fulcrum pin 55 on the chassis 2. A tension spring 56 is stretched between the spring anchor 53 a of the first lever 53 and the spring anchor 54 a of the second lever 54. As a result, the hook 53 b of the first lever 53 engages with the outer side 54 b of the second lever 54, and thereby, the first lever 53 and the second lever 54 are held together and integrated. It is noted that the cam follower 60 passes through an arcuate slot 2 b provided in the chassis 2, and touches the cam faces 25 a to 25 d of the mode changing slider 20. Moreover, a torsion spring 61 (Figure 5) is interposed between the second lever 54 and the chassis 2. The fulcrum pin 55 passes through the coiled portion 61 a of the torsion spring 61. As shown in Figure 2, one end 61 b of the torsion spring 61 is engaged with a spring stop 2 c provided in the chassis 2, and the other end 61 c of the torsion spring 61 is pressed against the cam follower 60 at the right side thereof in Figure 2, so that the cam follower 60 is pressed against one end of the arcuate slot 2 b . Reference numerals 76 and 77 shown in Figure 7 denote the pair of brake levers of the brake operating mechanism, which are rotatably supported by a pair of shafts 78 projecting from the auxiliary chassis 3, respectively. As shown in Figure 1A, to one end of each brake lever 76, 77, a brake shoe 76a, 77a is secured, and at the other end, a spring stop 76 b , 77 b is provided, respectively. Further, a tension spring 79 is stretched between the spring stops 76 b and 77 b , so that the brake shoes 76 a and 77 a are pressed against respective lower portions of the stepped brake drums 5 c and 5 'c (Figure 7) on the sides thereof opposite to each other. As shown in Figures 6 and 7, the cam follower 76 c , which follows the cam face 29 of the slider 20, projects from the brake lever 76 adjacent to the spring stop 76 b . The cam follower 76 d , which follows the cam face 80 a of the auxiliary slider 42, projects from a position between the cam follower 76 c and the spring stop 76 b , and similarly, the cam follower 77 c , which follows the cam face 80 b of the auxiliary slider 42, projects from a position of the brake lever 77, corresponding to the cam follower 76 d of the brake lever 76. As shown in Figures 1A to 2, 4, and 7, a pair of levers 81 and 82 of the back-tension exerting mechanism are provided to back tension the magnetic tape 15. As shown in Figure 4, each lever 81 or 82 is rotatably supported by a shaft 83 or 84, respectively. To one end of the lever 81 or 82, a brake shoe 81 a or 82 a is secured, respectively. From the other end of lever 81 a cam follower 81 b projects downwards. The cam follower 81 b passes through a rectangular hole 2 e in the chassis 2 and comes in contact with the cam face 27 of the slider 20. On the other hand, the cam follower 82 b , which follows the cam faces 28 and 28 a of the slider 20, projects upwards from the other end of the lever 82, as shown in Figure 3. As shown in Figures 2 and 4, one side of the lever 81, to which the brake shoe 81 a is secured, is substantially sectorial in shape, and has an opening 81 c . Into the opening 81 c , a resilient piece 81 d projects from a side of the opening 81 c near to the shaft 83 (in the drawing, the resilient piece 81 d is in a state of being elastically deflected), and the free end of the resilient piece 81 d is secured to the chassis 2 so as to normally press the brake shoe 81 a against the brake drum 5 c of the supply reel base 5, as shown in Figure 1C. Similarly, the brake shoe 82 a of the lever 82 is pressed against the brake drum 5' c , as shown in Figure 1D due to the force of a tension spring 85 stretched between the lever 82 and the auxiliary chassis 3. Reference numeral 72 in Figure 2 is a tension regulating arm having the shape of the letter "2". At a point near to one end of the arm 72, it is rotatably secured to the chassis 2 through a shaft 73, and a pin 74 projects from the other end of the arm 72. Further, a tension spring 75 is stretched between the arm 77 and the chassis 2, so that in Figure 2, the arm 72 is urged counterclockwise so far that the other end of the arm 72 abuts against a movable base 64 a (hereinafter described) of the tape loading mechanism 62. As shown in Figures 2 and 8, the tape loading mechanism 62 comprises a pair of guide grooves 2 d provided in the chassis 2, respective tape loading posts 64 guided by the pair of guide grooves 2 d , the pair of partially toothed pinions 70 engaged with the respective racks 30 of the mode changing slider 20, and a pair of link devices 65, each having a first link 66 and a second link 68, connecting the tape loading post 64 to the pinion 70. The guide grooves 2 d are arranged to extend aslant on respective right and left sides of the head drum 6 in Figure 2 in such a way that they diverge toward the edge of the chassis 2 at the upper side of Figure 2. Respective positioning blocks 63, which have V-shaped contact faces 63 a , are secured to the ends of the two guide grooves 2 d which are spaced the furthest away from each other. As shown in Figure 4, the tape loading post 64 projects upwards from a movable base 64 a guided by the guide groove 2 d , and has a cylindrical surface at the lower end thereof, which serves as a contact face 64 b with the positioning block 63, and a flanged roller rotatably supported by the upper end thereof, which serves as a tape loading member 64 c . As shown in Figure 8, the construction of each link device is substantially the same and will be given for only one of the devices. The second link 68 is rotatably connected with the movable base 64 a at one end thereof, and is also rotatably connected, at the other end thereof, with one end of the first link 66 of the link device 65. The first link 66 has substantially the same length as the second link 68. Further, the other end of the first link 66 is fixedly connected with a sleeve 67 (Figure 9) into which a shaft 69 fixed to the chassis 2 is loosely fitted. The partially toothed pinion 70 engaged with the rack 30 of the slider 20 has a central hole 70 g (Figure 9), and a small diameter portion of the stepped sleeve 67 is loosely fitted into the central hole 70 g . As shown in Figure 8, the upper part of the partially toothed pinion 70 has a pair of flat portions 70 a and 70 b which form an acute angle with each other. An overhang portion 70 f extending over the toothed portion 70 c is interposed between the ends of flat portions 70 a and 70 b . Further, a spring stop 70 d projects upwards from the overhang portion 70 f , and a projection 70 e , located diametrically opposite to the spring stop 70 d , projects upwards between the ends of the flat portions 70 a and 70 b . The coiled portion 71 a of a torsion spring 71 is fitted into a large diameter portion (Figure 9) of the stepped sleeve 67. One end 71 b of the torsion spring 71 is engaged with the spring stop 70 d , as shown in Figure 8. The other end 71 c of the torsion spring 71 is engaged with a spring stop 66 a which projects downwards from the first link 66 so that the pinion 70 can be biased in a clockwise direction, for example, in Figure 6 with respect to the first link 66. When the spring stop 66 a of the first link 66 abuts against the projection 30 e of the pinion 70, as shown in 6, the first link 66 and the pinion 70 become a unitary member. The functions of the digital audio tape player (R-DAT) (1) Relations between the mode changing slider 20 and the auxiliary slider 42 The first cam face 26 of the slider 20 has five steps: a first step 26 a , a second step 26 b , a third step 26 c , a fourth step 26 d and a fifth step 26 e . As the mode changing slider 20 is moved to the right in Figure 6, the cam follower 48 of the auxiliary slider 42 ascends the steps 26 a to 26 e in turn, so that the auxiliary slider 42 is moved in a direction perpendicular to the motion of the slider 20 against the force of the spring 51. That is, when the slider 20 is located in a first position shown in Figure 6, the cam follower 48 is in contact with the first cam face 26 at a position within the first step 26 a and spaced away from the second step 26 b . When the slider 20 is located in a second position shown in Figure 1A, the cam follower 48 is in contact with the second step 26 b . When the slider 20 is located in a third position shown in Figure 1B, the cam follower 48 is in contact with the third step 26c. When the slider 20 is located in a fourth position shown in Figure 1C, the cam follower 48 is in contact with the fourth step 26 d . Finally, when the slider 20 is located in a fifth position shown in Figure 1D, the cam follower 48 is in contact with the fifth step 26 e . (2) In a first mode position (Figures 2 and 6) The cam follower 60 of the pinch-roller transferring mechanism abuts against the left end of the arcuate slot 2 b of the chassis 2 as viewed in Figure 2, and is in a contact with the first cam face 25 a , as shown in Figure 6. The movable base 64 a of the tape loading mechanism 62 is located at the lower side of the guide groove 2 d as viewed in Figure 2. The links 66 and 68 of the link devices 65 are folded so as to form the shape of the letter "v", as shown in Figure 6. The partially toothed pinion 70 is locked, since one of the flat portions 70 a and 70 b is in contact with a small portion 23 a of the outside of the longitudinal member 23 of the slider 20, as shown in Figure 6, the small portion 23a being adjacent to the right ends of the rack 30 and the recess 31, as viewed in Figure 8. As shown in Figures 6 and 8, the cam follower 76 c of the brake operating mechanism is in contact with a first step 29 a of the stepped cam face 29 of the slider 20, which is flush with the first step 26 a of the first cam face 26, so that the brake shoe 76 a secured to the brake lever 76 is separated from the brake drum 5 c of the supply reel base 5. The brake shoe 77 a secured to another brake lever 77 is pressed against the brake drum 5' c of the take-up reel base 5'. As shown in Figures 2 and 8, the cam follower 81 b of the back-tension exerting mechanism is in contact with a first step 27 b of the stepped cam face 27 of the slider 20, so that the brake shoe 81 a secured to the lever 81 of the back-tension exerting mechanism is separated from the brake drum 5 c of the supply reel base 5. It is noted that the above state of the back-tension exerting mechanism is held even when the slider 20 is in the positions shown in Figure 1A, 1B and 1D. Similarly, as shown in Figures 6 and 8, the cam follower 82 b of the back-tension exerting mechanism is in contact with the cam face 28 of the slider 20, so that the brake shoe 82 a secured to the lever 82 of the back-tension exerting mechanism is separated from the brake drum 5' c of the take-up reel base 5'. It is noted that the above state of the back-tension exerting mechanism is held even when the slider 20 is in the positions shown in Figures 1A to 1C. In the meantime, the tension regulating arm 72, which has been located in the position shown in Figure 2 because of being abutted to the movable base 64 a , rotates on the shaft 73 due to force of the tension spring 75 as the movable base 64 a is moved toward the positioning block 63, and stops rotating as the end 72 a , which is in opposed relation to the other end from which the pin 74 projects, abuts against the back side of the lever 81. (3) In a second mode position (Figure 1A) The cam follower 60 of the pinch-roller transferring mechanism, which is located in the position shown in Figure 6, is pushed by the first cam face 25 a , and revolved clockwise as viewed in Figures 5 and 6 around the fulcrum pin 55, as the slider 20 is moved in the normal direction. Thus, the cam follower 60 begins to follow the second cam face 25 b , as shown in Figure 1A. The pinch-roller 58, having been located in the position shown in Figure 2, is transferred to a preparatory position shown in Figure 1A. There, the pinch-roller 58 is spaced apart from the capstan 17 by a predetermined distance due to clockwise rotation of the pinch-roller transferring levers 52. It should be noted that as illustrated in Figure 10, the cam follower 60 is kept in contact with the second cam face 25 b even in a third mode position (Figure 10) to be described hereinafter. The partially toothed pinion 70 of the tape loading mechanism 62, which is located in the position shown in Figure 6, is rotated counterclockwise, as viewed in Figure 1A, due to engagement with the rack 30. Simultaneously, the slider 20 is moved in the normal direction, and thereby, the folded links 66 and 68 shown in Figure 6 are extended as shown in Figure 1A. Thus, the tape loading post 64 reaches the position shown in Figure 1A, where the movable base 64 a is in contact with the positioning block 63, at a time a little before the slider 20 reaches the second position. When the slider 20 reaches the second position, the partially toothed pinion 70 is disengaged from the rack 30, as shown in Figure 1A, and the other flat portion 70 b of the pinion 70 comes in contact with a small portion 23 b of the outside of the longitudinal member 23 of the slider 20, so that the pinion 70 is locked. It should be noted that the recess 31 is disposed over the length of the rack 30, so that rotation of the pinion 70 is not interfered with when the pinion 70 engages with the rack 30. The small portion 23 b is provided adjacent to the left end of the rack 30 and recess 31 as viewed in Figure 8. During this time, after the first link 66 stops rotating due to contact of the second link 68 with the positioning block 63, the pinion 70 is rotated counterclockwise so that the projection 70 e is separated from the spring stop 66 a of the first link 66. Thus, a clockwise torque is exerted on the pinion 70 so that the pinion 70 can be securely locked, and a counterclockwise torque is exerted on the first link 66 so that the movable base 64 a can be pressed against the positioning block 63 by the force of the torsion spring 71. It should be noted that the above-mentioned state of the tape loading mechanism 62 is held even when the slider 20 is in the positions shown in Figure 1B, 1C, and 1D. When the slider 20 is moved in the second position shown in Figure 1A, the cam follower 76 c of the brake operating mechanism faces the second step 29 b of the stepped cam face 29 of the slider 20, so that the brake shoe 76 a secured to the brake lever 76 is pressed against the brake drum 5 c of the supply reel base 5, and at the same time, the cam followers 76 d , 77 c of the brake lever 76, 77, respectively, come near to the cam faces 80 a , 80 b , respectively, of the auxiliary slider 42. (4) In a third mode position (Figure 10) While the slider 20 is moved from the second position shown in Figure 1A to the third position shown in Figure 10, the cam followers 76 d , 77 c of the brake operating mechanism are pushed by the cam faces 80 a , 80 b , respectively, and the brake shoes 76 a , 77 a are separated from the brake drums 5 c , 5' c , respectively, as shown in Figure 10, due to rotation of the brake levers 76, 77, respectively. It should be noted that the above state of the brake operating mechanism is held even when the slider 20 is in the positions shown in Figure 1C and 1D, since the cam faces 80 a , 80 b extend in a direction parallel to the movement of the auxiliary slider 42. (5) In a fourth mode position (Figure 1C) While the slider 20 is moved from the third position shown in Figure 10 to the fourth position shown in Figure 1C, the cam follower 60 of the pinch-roller transferring mechanism is pushed by the cam face 25 c , and revolved clockwise around the fulcrum pin 55 so far that the cam follower 60 mounts the cam face 25 d . For the duration of the above motion of the cam follower 60, the pinch-roller transferring lever 52 is rotated clockwise as viewed in Figure 10 so far that the pinch-roller 58 abuts against the capstan 17, and after the first lever 53 stops rotating due to contact of the pinch-roller 58 with the capstan 17, only the second lever 54 is successively rotated against the force of the tension spring 56. Thus, the pinch-roller is pressed against the capstan 17 due to force of the tension spring 56. It should be noted that the above state of the pinch-roller transferring mechanism is held even when the slider is the position shown in Figure 1D. When the slider 20 reaches the fourth position thereof shown in Figure 1C, the cam follower 81 b of the left lever 81 (Figure 1C) of the back-tension exerting mechanism faces the second step 27 a of the stepped cam face 27, so that the brake shoe 81 a secured to the lever 81 is pressed against the brake drum 5 c of the supply reel base 5 due to force of the resilient piece 81 d . In addition, as the lever 81 rotates clockwise as viewed in Figure 10, the tension regulating arm 72, whose end 72 a is in contact with the back side of the lever 81, is rotated counterclockwise due to the force of the tension spring 75, and as a result, the pin 74 of the tension regulating arm 72 is pressed against the magnetic tape 15 under a predetermined pressure, as shown in Figure 1C. (6) In a fifth mode position (Figure 1D) When the slider 20 reaches the fifth position thereof shown in Figure 1D, the cam follower 82b of the right lever 82 (as viewed in Figure 1D) of the back-tension exerting mechanism faces the recess 28 a , so that the brake shoe 82 a secured to the lever 82 is pressed against the brake drum 5' c of the take-up reel base 5' due to force of the tension spring 85. (7) Tape loading operation The tape cassette 10 is mounted on the digital audio tape player in the state shown in Figure 2. The pair of tape reels 14 and 14' are engaged with the respective reel engaging shafts 5 d and 5' d of the pair of reel bases 5 and 5'. At that time, the pinch-roller 58, the movable tape guide 59, the tape loading members 64 c and the pin 74 of the tension regulating arm 72 are positioned within the recess 12 b of the tape cassette 10 so as to be surrounded by the recess 12 b and the stretched tape 15. While the mode changing slider 20 is moved from the first position thereof, shown in Figure 6 to the second position thereof, shown in Figure 1A, the magnetic tape 15 wound around the supply reel 14 is drawn out by the tape loading mechanism 62 and stretched, in turn, among the stationary tape guide 7, the tape loading member 64 c , the head drum 6, another tape loading member 64 c , another stationary tape guide 8, the pinch-roller 58 located in the preparatory position thereof, and the movable tape guide 59 which is located near to the right opening 12 b (as viewed in Figure 2). It should be noted that the supply reel base 5 is braked by the brake operating mechanism, and the pin 74 of the tension regulating arm 72 is not in contact with the magnetic tape 15 yet, because the end 72 a is in contact with the lever 81 of the back tension exerting mechanism. As to the reel base driving mechanism, the swingable gear 96 is not put in action because the arm 94 is in a neutral position, and similarly, the swingable gears 98 and 98' are not put in action because the lever 97 is in a neutral position. (8) Tape unloading operation While the slider 20 is moved from the second position thereof, shown in Figure 1A, to the first position thereof, shown in Figures 2 and 6, the tape loading post 64 is returned to the position shown in Figure 2, and the pinch-roller 58 is also returned to the position shown in Figure 2. Further, the supply reel base 5 is released from the brake. Substantially at the same time, the capstan motor 18 is driven in the normal direction, and thereby the intermediate gears 93 are rotated counterclockwise as viewed in Figure 6, so that the lever 97 is rotated counterclockwise. The swingable gear 98 is engaged with the small driven gear 5 b of the supply reel base 5. Thus, the supply reel 14, which is engaged with the supply reel base 5, is rotated at high speed to wind the drawn-out tape 15. (9) Fast forward (FF) mode and Rewind (REW) mode When the slider 20 is moved from the second position thereof, shown in Figure 1A, to the third position thereof, shown in Figure 10, the reel bases 5 and 5' are released from the brake. The pinch-roller 58, the levers 81 and 82 of the back-tension exerting mechanism and the tension regulating arm 72, shown in Figure 10, are in the same positions as those shown in Figure 1A. Further, the arm 94 of the reel base driving mechanism is immovably held in the neutral position, and the lever 97 of the reel base driving mechanism is in the neutral position but is swingable. When the fast forward mode is selected, the capstan motor 18 is driven in the reverse direction thereof, so that the intermediate gears 93 are rotated clockwise, as viewed in Figure 20, the lever 97 is, thereby, rotated clockwise, and the swingable gear 98' is engaged with the small driven gear 5' b of the take-up reel base 5'. Thus, the take-up reel base 5' is rotated clockwise to wind the tape 15 on the take-up reel 14'. When the rewind mode is selected, the capstan motor 18 is driven in the normal direction thereof, so that the supply reel base 5 is rotated counter-clockwise as viewed in Figure 10 to wind the tape 15 on the supply reel 14. (10) Forward play (FWD-PB) mode To establish the forward play mode of the player, the mode changing slider 20 is moved to the fourth position, as shown in Figure 1C. Thus, the pinch-roller 58 is pressed against the capstan 17 so as to sandwich the magnetic tape 15 between them. The brake shoe 81 a of the back-tension exerting mechanism comes in contact with the supply reel base 5, and as a result, the pin 74 of the tension regulating arm 72 comes in contact with the magnetic tape 15. Further, the arm 94 of the reel base driving mechanism is rotated to engage the swingable gear 96 with the large driven gear 5' a of the take-up reel base 5'. The lever 97 of the reel base driving mechanism is locked in the neutral position, because the cam follower 48 of the auxiliary slider 42 comes in contact with the fourth step 26 d of the first cam face 26. When the capstan motor 18 is driven in the reverse direction thereof, the capstan 17 is rotated counterclockwise, as viewed in Figure 1C, and the intermediate gears 93 are rotated clockwise, so that the swingable gear 96 is rotated counter-clockwise. Thus, the take-up reel base 5' is rotated clockwise to wind the magnetic tape 15 on the take-up reel 14'. The magnetic tape 15 is driven by the capstan 17 and pinch-roller 58 to run at constant speed in the normal direction thereof, and information is reproduced from the magnetic tape 15 through the rotated head drum 6. At that time, the brake shoe 81 a of the back-tension exerting mechanism is pressed against the brake drum 5 c of the supply reel base 5 so as not to make the magnetic tape 15 slacken. The pin 74 of the tension regulating arm 72 is brought into contact with the magnetic tape so as to adjust the tension of the magnetic tape 15. It is to be noted that a recording (REC) mode will be established in a similar way. (11) Reverse play (REV-PB) mode To establish the reverse play mode of the player, the mode changing slider 20 is moved to the fifth position, as shown in Figure 1D. Thus, the brake shoe 81a of the back-tension exerting mechanism is separated from the supply reel base 5 and as a result, the pin 74 of the tension regulating arm 72 is also separated from the magnetic tape 15. At the same time, the brake shoe 82 a of the back-tension exerting mechanism comes in contact with the take-up reel base 5'. The arm 94 of the reel base driving mechanism is rotated to engage the swingable gear 96 with the large driven gear 5 a of the supply reel base 5, and the lever 97 of the reel base driving mechanism is locked in the neutral position, because the cam follower 48 of the auxiliary slider 42 comes in contact with the fifth step 2 e of the first cam face 26. It should be noted that the magnetic tape 15 is in a state of being sandwiched between the capstan 17 and the pinch-roller 58. When the capstan motor 18 is driven in the normal direction thereof, the capstan 17 is rotated clockwise, as viewed in Figure 1D, and the intermediate gears 93 are rotated counterclockwise, so that the swingable gear 96 is rotated clockwise. Thus, the supply reel base 5 is rotated counterclockwise to wind the magnetic tape on the supply reel 14. In the above described embodiment toothed gears are employed as the driving elements. It should be apparent that in other, less advantageous embodiments, toothless wheels could be employed in place of the gears to achieve the same reduction ratios and direction reversing features. Such wheels would not, however, offer the precision driving relationship which is obtainable by using gears. In the following claims, "gears" is to be understood in its broadest sense as including wheels. Although the present invention has been shown and described with respect to preferred embodiments, various changes and modifications which are obvious to a person skilled in the art to which the invention pertains are deemed to lie within the scope of the invention as defined in the appended claims.

Claims: A mode changing mechanism for a tape cassette recording and/or reproducing apparatus including: rotary head drum means (6) for recording information on and/or reproducing information from a magnetic tape (15); a capstan (17) for driving the tape (15) past the rotary head drum means (16), pinch-roller transferring means, including a rotatably supported pinch-roller (58), for pressing the pinch-roller (58) against the capstan (17); a pair of reel bases (5, 5') capable of being engaged with a pair of tape reels (14, 14') which are accommodated in a tape cassette (10) loaded into the tape cassette recorder and/or reproducing apparatus, and on which reels the magnetic tape (15) is wound; tape loading means (62) for drawing out the magnetic tape (15) from the tape cassette (10) and leading the tape (15) to a predetermined tape path including the periphery of the rotary head drum means (16); a tape reel drive motor (18); reel base driving means for selectively imparting torque from the tape reel drive motor (18) to either of the pair of reel bases (5, 5'); control means for controlling the action of the reel base driving means and brake operating means (76, 77) for braking the pair of reel bases (5, 5') under predetermined conditions; wherein the mode changing mechanism comprises: a) mode changing means, including a mode changing slider (20) moveable in parallel with a line passing through the centres of the pair of reel bases (5, 5'), integral first regulatory drive means for driving the tape loading means (62) under a first set of predetermined conditions, second regulatory drive means for driving the pinch-roller transferring means under a second set of predetermined conditions, third regulatory drive means for driving the control means under a third set of predetermined conditions, and fourth regulatory drive means for driving the brake operating means (76, 77) under a fourth set of predetermined conditions; and b) slider driving means for driving the mode changing slider (20) in accordance with a selected one of a plurality of modes, each mode corresponding to a different combination of the first to fourth sets of predetermined conditions. A mode changing mechanism according to claim 1, in which the arrangement is such that the mode changing slider (20) is moved in parallel with a line passing through the centres of the pair of reel bases (5, 5') so as to be located in a first mode position where at least the tape cassette (10) can be ejected, in a second mode position where tape loading is completed with the help of the tape loading means (62), in a third position where a fast forward/rewind (FF/REW) mode is established, in a fourth position where a forward-playback/recording (FWD-PB/REC) mode is established, and in a fifth position where a reverse-playback (REV-PB) mode is established. A mode changing mechanism according to claim 2 in which the arrangement is such that the tape loading means (62) is changed from a pre-loading state to a post-loading state when the mode changing slider (20) is moved from the first mode position to the second mode position, and is held in the post-loading state even if the mode changing slider is moved from the second mode position to the fifth mode position through the third mode position and the fourth mode position. A mode changing mechanism according to claim 2 or 3, in which the pinch-roller transferring means is moveable to locate the pinch-roller (58) in an inactive position arranged within the mounted tape cassette (10), a preparatory position a little spaced away from the capstan (17), and an active position pressed against the capstan (17). A mode changing mechanism according to claim 4, in which the pinch-roller transferring means transfers the pinch-roller (58) from an inactive position to a preparatory position when the mode changing slider (20) is moved from the first mode position to the second mode position, hold the pinch-roller (58) in the preparatory position while the mode changing slider (20) is moved from the second mode position to the third mode position, transfers the pinch-roller (58) from the preparatory position to an active position when the mode changing slider (20) is moved from the third mode position to the fourth mode position, and holds the pinch-roller (58) in the active position while the mode changing slider (20) is moved from the fourth position to the fifth position. A mode changing mechanism according to any one of claims 2 to 5, in which the tape loading means (62) comprises a tape loading post (64) for drawing the tape out of the cassette (10) and wherein the tape loading post (64) is moveable between a pre-loading position arranged within the mounted tape cassette (10), and a post-loading position where the magnetic tape drawn out from the tape cassette by the tape loading post is led to the predetermined tape path including the periphery of the rotary head drum means (6). A mode changing mechanism according to claim 5 or 6 in which the arrangement is such that the tape loading means (62) is changed from a pre-loading state to a post-loading state when the mode changing slider (20) is moved from the first mode position to the second mode position, and is held in the post-loading state even if the mode changing slider (20) is moved from the second mode position to the fifth mode position through the third mode position and the fourth mode position. A mode changing mechanism according to any of the preceding claims, wherein the tape loading means (62) comprises a chassis (12) having guide ways (2d) formed therein, a pair or tape loading posts (64) moveable along separate ones of the guide ways so as to lead the magnetic tape (15), a pair of pinions (70), each of which at least locally has a toothed portion and an engaged face, and a pair of link devices (66, 68) for moving the respective tape loading posts (64) and separately connecting a different one of the tape loading posts (64) to a different one of the pinions (70). A mode changing mechanism according to claim 8, in which the first regulatory drive means comprises a rack (30) engaged with the toothed portion of at least one of the pinions (70). A mode changing mechanism according to claims 8 or 9, in which the first regulatory drive means comprises an engaging face which is engaged with the engaged face of at least one of the pinions (70) so as to hold the tape loading post (64) connected to it by one of the link devices (66, 68) in a post-loading mode position. A mode changing mechanism according to any one of the preceding claims, wherein the tape loading means (62) comprises a chassis (2) and wherein the pinch-roller transferring means comprises a lever (52) for rotatably supporting the pinch-roller (58), the lever being pivotally mounted on the chassis, and a spring (56, 61) which urges the lever in a direction so as to separate the lever (52) from the capstan (17). A mode changing mechanism according to claim 11, in which the second regulatory drive means comprises a cam face (25a-d) and a cam follower (60) which projects from the lever (52) of the pinch-roller transferring means and follows the cam face (25a-d). A mode change mechanism according to any of the preceding claims, wherein the tape loading means (62) comprises a chassis (2) and in which the reel base driving means comprises a plurality of gears and a swingable arm (94) which rotatably supports a first gear (96) of the plurality of gears to enable it to be selectively engaged with either one of the reel bases (5, 5') so as to impart a torque thereto in a forward/reverse (FWD/REV) mode, and a swingable lever (97) which rotatably supports a plurality of the gears (98, 98') to enable a different one of them to be selectively engaged with a different one of the reel bases (5, 5') so as to impart torque thereto in a fast forward/rewind (FF/REW) mode. A mode changing mechanism according to claim 13, in which the reel base driving means comprises an auxiliary slider (42) moveable to a first mode through fifth mode positions in a direction perpendicular to the movement of the mode changing slider so as to locate the swingable arm (94) in a FWD position, in a neutral position, or in a REV position, and locate the swingable lever (97) in a locking position or in a releasing position. A mode changing mechanism according to claim 14 in which the arrangement is such that the swingable arm (94) used for establishing the FWD/REV mode is held in a neutral position, with first gear (96) unengaged with either of the reel bases (5, 5') while the auxiliary slider (42) is moved from the first mode position to the third mode position through the second mode position; moved to a position for establishing the FWD mode when the auxiliary slider (42) is moved from the third mode position to fourth position; and moved to a position for establishing the REV mode when the auxiliary slider (42) is moved from the fourth mode position to the fifth mode position. A mode changing mechanism according to claim 15, further comprising a cam follower (94c) and wherein the auxiliary slider (42) has a cam groove (46) therein, the swingable arm (94) used for establishing the FWD/REV mode is rotatably secured to a chassis (2) at one end thereof, rotatably supports the swingable gear (96) at the other end thereof, and the cam follower (94c) is mounted on the swingable arm (94) to follow the cam groove (46) provided in the auxiliary slider (42). A mode changing mechanism according to any one of claims 14 to 16, in which the arrangement is such that the swingable lever (97) used for establishing the FF/REW mode is held in a releasing position while the auxiliary slider (42) is moved from the first mode position to the third mode position through the second mode position; located in a locking position when the auxiliary slider (42) is moved from the third mode position to the fourth mode position; and held in the locking position while the auxiliary slider (42) is moved from the fourth mode position to the fifth mode position. A mode changing mechanism according to claim 16, in which the swingable lever (97) used for establishing the FF/REW mode is rotatably secured at its approximate midpoint to the chassis (2); rotatably supports a swingable pair (98, 98') of the plurality of gears at its opposite ends, the swingable gears (98, 98') being selectively engageable with a different one of the reel bases (5, 5'); and has a projection (97b) fitted into a restraining hole (47) which is provided in the auxiliary slider (42). A mode change mechanism according to any of the claims 14 to 18, in which the third regulatory drive means has a cam face (26) and a cam follower (48) which projects from the auxiliary slider (42) and follows the cam face (26). A mode changing mechanism according to any one of the preceding claims, in which the brake operating means (76, 77, 81, 82) is moveable to a position where the reel base is braked and a position where the reel base is released. A mode changing mechanism according to any one of the preceding claims, in which the brake operating means comprises separate brake shoes (76a, 77a) for the supply reel base (5) and the take-up reel base (5'), and separate back-tension exerting means (81a, 82a) for the supply reel base (5) and the take-up reel base (5'). A mode changing mechanism according to claim 21, in which the arrangement is such that one of the back-tension exerting means (81a), which is put in action by being pressed against the supply reel base (5c), is held in an inactive position while the mode changing slider (20) is moved from the first mode position to the third mode position through the second mode position, and located in an active position when the mode changing slider (20) is moved from the third mode position to the fourth mode position; the other of the back-tension exerting means (82a), which is put in action by being pressed against the take-up reel base (5'c), is held in an inactive position while the mode changing slider (20) is moved from the first mode position to the fourth mode position through the second mode position and the third mode position, and located in an active position when the mode changing slider (20) is moved from the fourth mode position to the fifth mode position; one of the brake shoes (76a), which is put in action only when it is pressed against the supply reel base (5'c), is held in an inactive position except when the mode changing slider (20) is in the second mode position, and held in an active position only when the mode changing slider (20) is in the second mode position; and the other of the brake shoes (77a), which is put in action only when it is pressed against the take-up reel base (5'c), is held in an inactive position while the mode changing slider (20) is in the third mode position to the fifth mode position, and held in an active position while the mode changing slider (20) is in the first mode position and the second mode position. A mode changing mechanism according to claim 21 or 22, further comprising a chassis (2) and in which the brake operating means includes at least one brake layer (76, 77, 81, 82) attached to one of the brake shoes (76a, 77a, 81a, 82a) and rotatably secured to the chassis (2) to enable the attached brake shoe (76a, 77a, 81a, 82a) to come into contact with one of the supply or take-up reel bases (5c, 5'c), and urging means for urging the brake layer (76, 77, 81, 82) in a direction which presses the brake shoes (76a, 77a, 81a, 82a) against the one reel base (5c, 5'c). A mode changing mechanism according to claim 23, in which the fourth regulatory drive means comprises a cam face (29) and a cam follower (76c), which projects from a brake lever (76) of the brake operating means, for following the cam face (29). A mode changing mechanism according to claim 23 or 24, in which the brake operating means includes a plurality of brake levers (76, 77, 81, 82), the fourth regulatory drive means also includes cam faces (27, 28, 29, 80a, 80b) which are provided in the control means and separate cam followers (76c, d, 77c, 81b, 82b) which project from brake levers (76, 77, 81, 82) of the brake operating means for following the cam faces, and the motion of the control means is regulated by the third regulatory means. A tape cassette recording and/or reproducing apparatus having a tape transport mechanism incorporating a mechanism according to any one of the preceding claims.

Inventors: FUKUYAMA YUTAKA, MOTOTAKE TATSUYA, SUDOH YUJI, YAMAMOTO YOSHINORI, FUKUYAMA, YUTAKA, MOTOTAKE, TATSUYA, SUDOH, YUJI, YAMAMOTO, YOSHINORI, FUKUYAMA, YUTAKA, C/O SONY CORPORATION, MOTOTAKE, TATSUYA, C/O SONY CORPORATION, SUDOH, YUJI, C/O SONY CORPORATION, YAMAMOTO, YOSHINORI, C/O SONY CORPORATION
Applicants: SONY CORP, SONY CORPORATION
Application year: 1990
Main classification: G11B15
IPC codes: G11B15