JPS61160858A - Cassette tape player - Google Patents

Abstract

PURPOSE:To eliminate the misdetection of tape termination by applying the shift power given to a coupling member for an arm member connected to both reel shafts via friction from the reel shafts to a sensor member as the revolving power of a single direction. CONSTITUTION:When a magnetic tape reaches its termination, the revolutions of both reel shafts 5a and 6a are stopped. Thus no revolving power is given to back tension arms 61 and 62, and the revolving power given to a sensor arm 65 via a coupling arm 63 is also lost. Therefore a follower pin 65e which is shifted toward a shaft 66 in response to the movement of an eccentric cam 67a is left there. This position is limited in a range more inside than the advance end of a crescent drive cam 67b. Then a follower pin 67b is put on the cam 67b and driven by the cam 67b and the arm 65 is turned large. This large rotation of the arm 65 ensures the detection of the tape termination with no error.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cassette-type tape player that detects the end of a cassette tape running in both directions based on the stoppage of rotation of a reel shaft. .

[Technical background of the invention and its problems]

Conventionally, in this type of tape player, a member connected to the reel shaft via a friction mechanism receives rotational force while the reel shaft is rotating, and when the rotation of the reel shaft stops at the end of the tape, it no longer receives the rotational force. There is a device that uses this to detect the end of a tape.

However, in the past, members were only connected to one reel shaft, so depending on the tape running direction,
The disadvantage of this method is that when there is slack in the loaded cassette tape, the end of the tape is erroneously detected, and the auto shaft off mechanism or auto reverse mechanism is activated based on this detection.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones, and an object of the present invention is to provide a cassette-type tape player that does not erroneously detect tape slack even when the cassette tape has slack as the end of the tape. shall be.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the figure, numeral 1 is a chassis, which directly or indirectly supports all the members of the mechanism. 2 and 3 are installed vertically on a support plate (not shown) provided at a certain distance on the rear side of the chassis 1, and are inserted into the front side of the chassis 1 through an opening (not shown) in the chassis 1. It is a protruding shaft. The shafts 2.3 are separated by a distance corresponding to the center axes of both reel hubs of the compact cassette tape 4, and reel stands 5 and 6 are rotatably attached to the shafts 2.3, respectively, as shown in FIG. At the same time, reel shafts 5a and 6a are respectively provided integrally and concentrically with the reel stands 5 and 6 via a friction mechanism (not shown), and each reel hub of the cassette tape 4 is mounted on the reel shafts 5a and 6a. They are adapted to be engaged with each other. Further, the reel stands 5 and 6 have large diameter gears 5b and 6b and small diameter gears 5c,
6c are formed integrally and concentrically.

Between the reel bases 5 and 6, there is a first idler gear 7 that engages with and disengages from the small diameter gear 6c of the reel base 6, and a second idler gear that engages with and disengages from the first idler gear 7 and the small diameter gear 5C of the reel base 5. An idler gear 8 is arranged, and the first idler gear 7
As shown in FIG. 3, the lever 10 is rotatably attached to the rear surface of the chassis 1 at a location remote from the pivot point of the lever 10, which is rotatably pivoted by a pin 9. It is rotatably attached to the other end of a lever 12, one end of which is rotatably pivoted to the back surface of the chassis 1 via a pin 11.

In FIG. 2, reference numeral 15.16 denotes a capstan rotatably supported by bearings 15a and 16a so as to pass through the chassis l at right angles, and a protruding portion of the capstan 15.16 on the back side of the chassis 1. The axes of flywheels 15b and 16b that stabilize the rotation of the capstan 15 and 16 by absorbing minute speed fluctuations caused by uneven rotation of the motor and the rotation transmission mechanism, which will be described later, are fixed to the cap. The lower ends of the stands 15 and 16 are held by brackets (not shown) attached to the back surface of the chassis l so that they do not fall off the bearings 15a and 16a. Gears 15c and 16c are integrally and concentrically attached to the flywheels 15bs and 16b.

A third idler gear 17 and a fourth idler gear 18 are always meshed with the gears 15c and 16c, and these idler gears 17 and 18 are connected to the capstan 1 as shown in FIG.
The supporting levers 19 and 20 are rotatably supported on bearings 15a and 16a of 5 and 16, respectively, and
The levers 19 and 20 move the idler gears 17 and 18 supported by the large diameter gears 5b and 6b of the reel stands 5 and 6, respectively.
They are biased by springs 21, 22 in the direction of engagement.

In FIG. 2, 25 is a drive motor attached to the chassis l, and a drive belt 27 is suspended between a pulley 26 attached to a motor shaft protruding from the back side of the chassis and both flywheels 15b and 16b. At the same time, the rotation of the motor 25 is transmitted to the capstan 15, 16, and the heald 27 is also suspended on the pulley 7a which is integrally attached to the first idler gear 7, so that the rotation of the motor 25 is transmitted to the first idler gear 7 as well. It is meant to be transmitted. In addition, the pulley 28 provided between the flywheels 15c and 16a and on which the belt 27 is suspended adjusts the contact area of the belt 27 with both flywheels so that the flywheel 15b is connected to the belt 27.

This is to ensure that the drives 16b are driven with approximately equal force.

A head substrate 30 movable in the directions of arrows A and B in FIG. 4 is provided on the surface of the chassis 1.
A reproducing head 31 is installed at the central end on both sides, and rubber pinch rollers 32 and 33 are rotatably supported and attached to support frames 32a and 33a corresponding to the capstans 15 and 16. It is being Above head board 3
0 is provided with long holes 30a to 30c, and each of the long holes 30
Guide pins 34a protruding from the chassis l at a to 30c
34c is inserted, thereby guiding the entire head substrate 30 in a slidable manner in the directions of arrows A and B. Further, on both sides of the substantially central portion of the head substrate 30,
A cam portion 30d that engages with engagement pins 19a and 20a protruding from the support lever 19.20 of the gear 17.18 and rotates the support lever 19.20 against the spring 21.22.
.

30e is formed. Furthermore, as the head substrate 30 moves forward in the A direction, support frames 32a of the pinch rollers 32 and 33 are placed on both sides of the end portion of the head substrate 30 in the B direction.
, 33a are helical springs 32b, 33b.
support frames 32a, 33a in the direction in which the pinch rollers 32, 33 are pressed against the capstan 15, 16.
Engagement pieces 30f and 30g for rotating are provided in a protruding manner.

Furthermore, the above-mentioned support frames 32a and 33a are provided with engagement pins 32C9.
33c is provided protrudingly, and the engagement pins 32c, 33
The support frames 32a and 33a are returned to their original positions when the edge of the head substrate 30 that is attempting to retreat in the direction B hits the edge c.

Between the center part of the head board 30 and the chassis 1,
A regeneration lever 36 is provided so as to be movable in the directions of arrows A and B, to which a return force in the direction of arrow B is applied by, for example, a pin spring (not shown). A playback button 37 is fixed to one end of the playback lever 36 on the B direction side, and a long hole 36a is bored at the other end on the opposite side of the playback button 37.
6a is engaged with a guide pin 38 protruding from the chassis l,
This guides the regenerated lever 36 in the A and B directions, and restricts the amount of movement in the B direction. and,
The reproduction lever 36 and the head substrate 30 are integrated by the end edge of the head substrate 30 being brought into elastic contact with the upright piece 36b of the reproduction lever 36 by a pin spring 39 compressed between them.

On the left and right of the regeneration lever 36 on the chassis l, there are REW
A lever 40 and an FF lever 42 are arranged, and a stop/eject lever 44 and a reverse lever 46 are further provided on the left and right sides.
A REW button 41, an FFi port 43, a stop/eject button 45, and a reverse dual port 47 are respectively fixed to one end of these levers. Similarly to the regeneration lever 36, the levers 40, 42 and 46 are supported by springs (not shown), and the lever 44 is supported by the spring 4.
8 (Fig. 5), a return force is applied in the direction of arrow B, respectively.

50 (Fig. 5) is the regeneration lever 36 and the REW lever 4.
0. It is a lock plate that holds one of the FF levers 42 in the pressed position, and has a long hole fitted into a pin 51 protruding from the chassis l, and is connected to the arrow C perpendicular to the directions A and B. is guided in the direction D, and the support lever 2
0 and is biased in the direction of arrow C by a spring 22 stretched between the two. When the regeneration lever 36, the REW lever 40, and the FF lever 42 are pressed, the upright pieces 36b, 40a, and 42a of the lock plate 50 engage with the lock plate 50, respectively, and move the lock plate 50 to the spring 22.
The tapered portion 5 is moved in the direction of the arrow against the bias of
0a, 50b, 50c and locking portions 50d, 50e, 50f formed at the terminal ends of the tapered portions, and the locking portions 50d, 50e, 50f are provided with standing pieces 36b, 40a,
40b are respectively locked, the levers 36,
40.42 will now be held in its pressed state.

The pressed state of the regeneration lever 36 is released only by pressing the stop/eject lever 44, but the pressed state of the REW lever 40. The pressed state of the FF lever 42 is released by pressing the stop/eject lever 44, pressing the regeneration lever 36, or by operating the REW and FF shunt off mechanisms described later.

52 (FIG. 5) is a slide plate provided overlapping the opening/tuck plate 50, in which a pin 51 is fitted into a long hole and guided in the directions of arrows C and D, and is connected to the support lever 19. It is biased in the direction of the arrow by a spring 21 stretched between the two.

The slide plate 52 includes a regeneration lever 36 and a REW lever.
When the lever 40 and the FF lever 42 are pressed, their upright pieces 36b, 40a, and 42a engage with each other to move the slide plate 52 in the direction of arrow C against the urging force of the spring 21, a tapered portion 52a; 52b,
52c is formed.

53 (FIG. 5) is a release arm rotatably supported on the chassis 1 by a shaft pin 54, and is biased in the counterclockwise direction by a spring 55 stretched between it and the chassis 1. The arm portion 53a is in elastic contact with the shaft pin 44a on the stop/eject lever 44 and is held in this state.

A cam surface 53b is formed on the first arm portion 53a, and when the shaft pin 44a moves due to the pressure of the stop/eject lever 44, the shaft pin 44a rides on the cam surface 53b and the arm portion 53a is moved by a spring 55. Rotate clockwise against the As the arm portion 53a rotates, the second arm portion 53c engages with one end 50g of the lock plate 50, and moves the lock plate 50 in the direction indicated by the arrow against the spring 22. Therefore, when the lock plate 50 moves, if there is a lever locked by the lock plate 50, that lock is released and the lever returns to its original position, allowing playback, REW, F
F operation is stopped. The arm 53 further includes a third arm portion 53d.

This arm portion 53d is provided to constitute a part of an auto-shutoff mechanism that detects the end of the tape during REW and FF operations and automatically stops the REW and FF operations accordingly. However, this arm portion 53d
does not operate in response to detection of the end of the tape during playback operation, thereby enabling the auto-reverse mechanism described below to operate.

First, the configuration of the auto shaft off mechanism will be described below.

As shown in the figure, the auto-shutoff mechanism has back tension arms 61 and 62 provided to interlock with the reel shafts 5a and 5a via a friction mechanism, and the free ends of the arms 61 and 62 are connected to the reel shafts 5a and 5a. Both ends of the connecting arm 63 are rotatably connected. A pair of square holes 63a and 63b are bored in the center of the connecting arm 63, and a detection arm rotatably supported by a shaft pin 64 in the middle of the square holes 63a and 63b is inserted into the square holes. When the reel shaft rotates in the direction of the arrow (FIG. 6), the connecting arm 63 is moved in the direction of the arrow and the square hole 63a is exposed to the projection 65a.
When the reel shaft rotates in the opposite direction to the arrow, the connecting arm 63 is moved in the opposite direction to the square hole 63.
b comes into contact with the protrusion 65b. As a result, as long as the reel shaft is rotating, a rotational force equal to the back tension in one direction is always applied to the detection arm 65 regardless of the direction. The detection arm 65 has an arcuate tongue piece 65c at one end, a driving pin 65d at its base, and a driven pin 65e at its tip. The functions of both pins 65d and 65e will be described later. The block 65f provided at the other end of the detection arm 65 is for balancing the weight with the tongue piece 65c and preventing the detection arm 65 from rotating under its own weight.

The driven pin 65e of the detection arm 65 faces a concave eccentric cam 67a formed on a cam gear 67 that is rotatably supported about the shaft pin 66. The cam gear 67 has a crescent-shaped drive cam 67b provided in a recess forming an eccentric cam 67a.
7b is provided such that its forward end is located at a position slightly farther than the small diameter portion of the eccentric cam 67a, and its rear end is located at a position a predetermined distance closer than the small diameter portion of the eccentric cam 67a. The cam gear 67 includes a small-diameter binion gear 6.
As shown in FIG. 2, the pinion gear 68 is rotated together with a large-diameter gear 70 fixed to one end of its rotating shaft 69. The large-diameter gear 70 has a large-diameter tooth 71 a meshed with a small-diameter tooth 71 b of a gear 71 that is always meshed with the first idler gear 7 . Therefore, the cam gear 67 and the pinion gear 68 are always rotating when the motor 25 is rotating the first idler gear 7 via the belt 27. .

On the other hand, the drive pin 65d of the detection arm 65 swings as the driven pin 65e swings along the inner circumferential surface of the eccentric cam 67b, and during this swing, the intermediate arm 72 (see FIG. ) and the end surface 73a of the switching arm 73 (described later). However, when the driven pin 65e rides on the crescent-shaped drive cam 67b and moves along the cam surface, As the drive pin 67d moves, the hook portion 72a and the end surface 73
a, and moves the intermediate arm 72 and the switching arm 73 by the amount of the movement stroke. The intermediate arm 72 has an elongated hole 72b drilled in its intermediate portion and is engaged with an axle pin 74 protruding from the chassis 1, so that the intermediate arm 72 can move linearly by the length of the elongated hole 72b and can swing freely about the axle pin 74. A spring 75 stretched between the shear and the shear I biases it in a direction opposite to the direction of movement. The other end of the intermediate arm 72 has a bending portion that engages with the third arm 53d of the arm 53 to rotate the arm 53 in a counterclockwise direction when the intermediate arm 72 moves in a non-swinging state. A piece 72C is provided.

Next, the configuration of the auto-reverse mechanism will be explained below.

As shown in FIGS. 1 and 7, the auto-reverse mechanism has toothless portions 81a and 81b at symmetrical positions across the rotating shaft 80.
is provided, and the above-mentioned pinion gear 6 is provided only in the toothless portion.
It has a partially toothed gear 81 which is provided so as to be in a non-meshing state with 8. The upper surface of the missing gear 81 has a shaft pin 82a in the middle part.
Reverse arm 82 (first
The protruding shaft 81C engaged with the elongated hole 82b at one end of the figure is located at a position offset from the center of rotation, and the toothless portions 81a and 8
Engagement recesses 81d and 81e are provided at symmetrical positions with respect to the center of rotation, and engagement recesses 81d and 81e are respectively provided at symmetrical positions with respect to the rotation center, and engagement recesses 81d and 81e are respectively engaged with locking members 83, which will be described later, to prevent rotation of the partially geared gear 81 at a position where 1b faces the pinion gear 68. A concentric cam surface 81f that holds the locking member 83 at a position displaced by a predetermined amount is formed between sta and ste.

A long hole 82C is formed at the other end of the reverse arm 82, and a shaft pin 85a' projecting from one end of the traveling direction switching slide plate 85 is engaged with the long hole 82C. The switching slide plate 85 is a capstan 15.16
The shaft pins 19b and 20b on the support lever 19.20 are reciprocated by a predetermined stroke on the chassis l along a line connecting the
The cam surfaces 85a are opposed to each other at a high position and a low position, respectively.
, 85b, and cam surfaces 85C, 85d are formed to face the shaft pins 32C, 33C on the pinch roller support frames 32a, 33a at the high and low positions, respectively. When the slide plate 85 is moved to the right, contrary to the above,
The shaft pins 19b and 20b on the support levers 19 and 20 are at the low and high positions of the cam surfaces 8sa and ssb, respectively, and the shaft pins 32C and 33C on the support frames 32a and 33a are at the low position of the cam surfaces 85c and 85d, respectively. They will now be facing each other in high positions. On the lower surface of the slide plate 85,
A pair of springs 85e and 85f are provided, and an operating piece 86a of a head switch 86 fixed to the chassis l is located between the wire plate springs to switch the head switch in accordance with the movement of the slide plate 85.

As shown in FIG. 4, the switching arm 73, which is moved by the drive pin 65d on the detection arm 65, has a long hole 73a formed in its middle portion fitted into an axle pin 88 on the chassis 1. It is provided to be movable by the length of the long hole 73a and swingable about the shaft pin 88, and a protrusion 73b protruding from a part of one end surface extends to the rear side through a window hole (not shown) of the chassis l. It is in contact with an upright piece 72d provided on the intermediate arm 72 so as to reach the middle arm 72, and its rotation in the counterclockwise direction is restricted by a window hole via the upright piece 72d. In the hole 73C at the end near the one end surface,
The bent piece 89a at one end is fitted into the elongated hole of the chassis 1, and the arrow A follows the elongated hole.

The other end 89b of the transmission arm 89, which is movable in direction B and swingable about the bending piece 89a, is engaged.

A biasing force is applied to the transmission arm 89 in the direction of arrow B and in the counterclockwise direction by a spring 90 stretched between the transmission arm 89 and the chassis 1 . Therefore, the switching arm 73 is normally in the first state shown by the solid line in FIG. 4 due to the biasing force applied to the transmission arm 89, but when the regeneration lever 36 is moved in the direction of arrow A during regeneration, The tip of the transmission arm 89 touches the bent piece 89a and the spring 90
The shaft bin 88 moves in the direction of arrow A against the
4, and is displaced to the second state shown by the broken line in FIG.

When the switching arm 73 moves in the first state, the other end surface of the switching arm 73 comes into contact with the movable piece 92a of the normally open leaf switch 92 constituting the second power switch, turning on the switch 92. In the second state, it abuts against the locking member 83. The locking member 83 is a mini-
A normally open leaf switch 93 that makes up the tinges inch
When the other end surface of the switching arm 73 comes into contact with the movable piece 93a, the engagement recesses 81a, 81 of the missing gear 81
b (Fig. 7), and the leaf switch 93 is turned on. Note that a normally open leaf switch 94 constituting the main power switch is provided adjacent to the switches 92 and 93, and as shown in FIG. F
By pressing the F lever 42, the slide plate 52 moves in the direction of arrow C against the spring 21, and its one end 52d
Turns on when pressed and supplies power to the motor and other devices.

An engagement hole 73f consisting of long and short portions 73d and 73e is bored near the other end surface of the switching arm 73, as shown in FIG.
An upright piece 102a at one end of a reversing arm 102 is rotatably supported by a spring 101 and biased counterclockwise by a spring 101. The standing piece 102a
is within the long portion 73d of the hole 73f when the switching arm 73 is in the first position, and the reversing arm 102 is in the spring 10.
1, the switching arm 73 only moves within the long portion 73d, but when the switching arm 73 is in the second position, it is within the short portion 73e of the hole 73f, so the rotation of the reversing arm 102 does not occur. According to the movement, the switching arm 73 is moved by hitting the wall of the short portion T3e. Note that the rotation of the reversing arm 102 is caused by pressing the reverse lever 46 to rotate the tapered surface 46a at the tip of the reversing arm 102.
This is done by being brought into contact with the upright piece 102b at the other end of the reversing arm 102.

As shown in FIG. 3, the REW lever 40 has two protrusions 40b and 40c, and the FF lever 42 has a protrusion 42b and a shaft pin 42c. Projection piece 4゜b is REW lever 40
When pressed, it comes into contact with one end of a lever plate 105 rotatably provided on the chassis 1 and rotates the lever plate 105,
When the FF lever 42 is pressed, the projecting piece 42b comes into contact with one end of a lever plate 106 rotatably provided on the chassis l, thereby rotating the lever plate 106. Upright pieces 105a and 106a facing the window hole 30g of the head substrate 30 are provided at the other ends of the lever plates 105 and 106, respectively, so that when the head substrate 30 is moved in the direction of arrow A and maintained in the playback state, When the lever plates 105 and 106 are rotated by pressing the REW lever 40 and the FF lever 42, the lever plates 105 and 106 are rotated.
The upright pieces 105a and 106a of 106 abut against the wall of the window hole 30g and move the head substrate 30 in the direction of arrow B against the spring 39. This movement of the head substrate 30 weakens the pressure of the head 311 against the tape surface and releases the pinch roller 32 or 33 from the capstan 15 or 16.

The protruding piece 40c of the REW lever 40 is engaged with a pin spring 108 attached to the lever 12 supporting the second idler gear 8.

On the other hand, the shaft pin 42c on the FF lever 42 abuts against the cam portion 109a at one end of the FF arm 109 rotatably provided on the chassis 1 due to the pressure of the FF lever 42, causing the FF arm 109 to rotate. The bent piece 109b at the other end of the FF arm 109 is in contact with the extension piece 10a of the lever 10 supporting the first idler gear 7, and this abutting state causes a gap between the arm 109 and the lever 10 (D It is held by a tensioned spring 110.

By the way, as shown in FIG.
113, an eject arm 115 is provided on the lever 44 so as to be slidable and swingable about the shaft pin 112. The eject arm 115 has a bifurcated tip, and one 1I 115a is located between a pair of upright pieces 52e at the other end of the slide plate 52, and is connected to the slide plate 52 only in the directions of arrows C' and D. It is now possible to do so. The other J! An engaging portion is formed in 1115b, and the engaging portion engages with the engaging upright piece 44G of the lever 44 when the lever 44 is pressed while the slide plate 52 is not moving. The upper eject arm 115 will now move together. The eject arm 115 also has an upright piece 1 at its rear end.
15c, and as the eject arm 115 moves, the upright piece 115C abuts against the eject rotating piece 116 rotatably provided on the side wall 1a of the chassis 1, and the eject rotating piece 116 is rotated against the spring 117. make it move. The eject rotary piece 116 has an L-shape, and one end thereof is rotatably supported, and when the other end is rotated, the other end rises, and the cassette tape 4 mounted thereon is lifted upward. Push up and eject.

Next, the operation of the tape recorder according to the present invention configured as described above will be explained.

Playback operation> With the cassette tape installed in the specified position, press the playback button 37.
When you press , the playback lever 36 moves and the head board 3
0 is moved in the direction of arrow A via pin spring 39. When the playback lever 36 is held in a pressed state with its upright piece 36b engaged with the engagement portion 50e of the lock plate 50, the head on the head board 30 is inserted through the window hole of the cassette tape and pressed against the tape. be done. Further, the slide plate 52 is moved in the direction of arrow C by the upright piece 36b, and the leaf switch 94, which is the main power switch, is
is turned on and power is supplied to the motor and other parts. Furthermore, as the head substrate 30 moves, rotational force is applied to the support frames 32a and 33a of the pinch rollers 32 and 33, but the engagement pin 32c of one of the support frames 32a rides on the cam surface 85C on the switching slide plate 85. While the other support frame 33 is raised and further rotation is restricted,
Since the engagement pin 33c of a is disengaged from the cam surface 85d, the pinch roller 33 of the support frame 33a is attached to the capstan 16.
It is rotated until it is pressed into contact with the Furthermore, the head substrate 3
0, the engagement pins on the support levers 19, 20 are disengaged from the cam parts 30d, 30e of the head base plate 30, respectively, and the support levers 19.20 are rotated by the springs 21.22. The other shaft pin 19b on the lever 19 rests on the cam surface 85a on the switching slide plate 85, so that further rotation is restricted, whereas the idler gear 18 on the support lever 20 rests on the reel stand. It is rotated until it meshes with the large diameter gear 6b of No.6. Furthermore, since the tip of the regeneration lever 36 comes into contact with the transmission arm 89 and moves it, the switching arm 73 is swung from the solid line to the broken line in FIG. 4.

In the above state, the rotation of the motor 25 is transmitted to the flywheel 16b via the belt 27, and the rotation of the motor 25 is transmitted to the flywheel 16b.
The capstan 16 integrated with b is rotated. Further, the reel stand 6 is rotated via the idler gear 18 that meshes with the gear 16c that rotates together with the flywheel 16b. Therefore, the reel shaft 6a connected to the reel stand 6 via the friction mechanism is rotated, and the reel shaft 6a is rotated.
The tape is wound around the reel hub in the cassette tape 4 that is engaged with the tape a. Of course, at this time, the tape is held between the capstan 16 and the pinch roller 33 and is running at a constant speed.

Stop and eject cassette> To stop the playback operation as described above, press the stop/eject button 45 and move the lever 44 with the spring 4.
As the lever 44 moves, the shaft pin 44a on the lever 44 abuts against the cam surface 53b of the first arm portion 53a of the release arm 53, thereby rotating the arm 53 in the clockwise direction. Due to this rotation of the arm 53,
The second arm portion 53C of the arm is the lock plate 50.
The lock plate 50 is moved in the direction of the arrow, and the playback lever 36 is released from the locked state.

As a result, the reproducing lever 36 is connected to the head substrate 30,
The tape player returns to its original position together with the slide plate 52 and the like, and the tape player becomes in a stopped state.

Note that when the slide plate 52 is in the reproducing state as described above, the slide plate 52 moves in the direction of the arrow C, and this movement causes the eject arm 115 to swing about the shaft pin 112, so that the engagement upright piece 44C on the lever 44 and the eject The leg 115b of the arm 115 is disengaged from the engagement portion. However, in the stopped state, eject arm 1
15 is not in a swinging state, the engaging portion of the leg 115b is in a position where it can engage with the engaging upright piece 44c of the eject lever 44, and when the stop/eject button 45 is pressed a second time, the lever 44 and its Upper eject arm 115
will now move together.

When the eject arm 115 moves, its upright piece 11
5c abuts against the eject rotating piece 116, which causes the eject rotating piece 116 to rotate, lifting and ejecting the cassette tape 4 placed thereon.

<FF and REV operations> When the REW button 41 is pressed in the stopped state with the cassette tape installed in a predetermined position, the REW lever 40 moves and its upright piece 40a is locked to the lock plate 50 and held in that state. . At this time, the standing piece 40a
moves the slide plate 52 and closes the leaf switch 94.
is turned on, power is supplied to the motor 25 to rotate the motor 25, and the rotation of the motor 25 is transmitted to the idler gear 7 via the belt 27. Also, the upright piece 40c on the REW lever 41 moves and rotates the lever 12,
The idler gear 8 thereon is meshed with the gear 5C of the reel stand 5 and the idler gear 7.

As a result, the reel stand 5 is rotated, and each reel 5th
The reel hub of the cassette tape 4, which is engaged with the interlocking reel shaft 5a via a friction mechanism, is rotated to rewind the tape. That is, a REW operation is performed.

On the other hand, when the FF button 43 is pressed, the shaft pin 42c on the FF lever 42, which moves accordingly, rotates the lever 109 and moves the idler gear 7 on it to the gear 6 on the reel stand 6.
C and rotates the reel stand 6. This reel stand 6
As a result of the rotation, the reel hub engaged with the reel shaft 6a is rotated, and the tape is rapidly fed.

<Cue and review operation> In the above-described reproduction operation state, when the REWS port 41 is fully opened, the upright piece 40b on the lever 40 hits the lever plate 105 and rotates the lever plate 105.

Due to this rotation of the lever plate 105, the upright piece 105a hits the window hole 30g of the head substrate 30, causing the head substrate 30 to retreat in the direction of arrow B. As the head substrate 30 retreats, the head 31 is no longer in pressure contact with the tape, and the head 31 is brought into a state in which it lightly contacts the tape. Further, as the head substrate 30 retreats, the idler gear 18 is disengaged from the reel stand 6, and the pinch roller 33 is disengaged from the capstan 16. At this time, the idler gear 8 meshes with the idler gear 7 and the gear 5c of the reel stand 5, and the rotation of the motor is transmitted to the reel stand 5, so that the tape is transferred to the reel hub engaged with the reel shaft 5a in the reproducing state. It is rewound. That is, a review operation is performed.

On the other hand, when the FF button 43 is pressed in the playback state, the idler gear 7 meshes with the gear 6C of the reel stand 6, and fast-forwarding of the tape in the playback state, that is, a cue operation is performed.

Tape end detection operation> When the tape is being wound by the reel hub engaged with the reel shafts 5a, 5a, the reel shafts 5a,
Back tension arm 61 frictionally connected to 6a
．． A rotating force corresponding to the tape running direction acts on the connecting arm 62, and therefore a moving force in one direction is applied to the connecting arm 63 that connects them, and this moving force causes the detecting arm 65 to move.
is always given rotational force in one direction, and its driven pin 6
5e is adapted to be driven by the surface of the eccentric cam 67a.

When the end of the tape is reached in the above state, the reel shaft 5a
, 6a stop rotating, and the reel shaft 5a.

The rotational force applied to the bank tension run arms 61 and 62 from 6a is eliminated, and therefore the rotational force applied to the detection arm 65 via the connection arm 63 is also eliminated. Therefore, the driven pin 65e, which has been moved in the direction of the shaft 66 by the eccentric cam 67a, is left at that position.

The position where the driven pin 65e is left is inside the advancing end of the crescent-shaped drive cam 67b, so the driven pin 67b rides on the cam 67b and is driven by the drive cam 67b. The detection arm 65 is largely rotated by driving the driven pin 67b. The end of the tape is detected by this large rotation of the detection arm 65, and this is utilized for auto shaft-off and auto-reverse operations, which will be described later.

Auto-reverse operation> When the end of the tape is detected during the above-described playback operation and the detection arm 65 is rotated significantly, the drive pin 65d on the detection arm 65 comes into contact with one end surface of the switching arm 73 and the switching arm is rotated. Move 73.

Since the switching arm 73 is in the position shown by the broken line in FIG. 4 during the regeneration operation, the movable piece 9 of the leaf switch 93 has the other end forming a mute inch due to the above movement.
3a and move it.

The movable piece 93a has an engagement recess 81a for the partially toothed gear 81.

Since the engaging member 83 that engages with stb is integrally provided, the movement of the movable piece 93a moves the engaging recess 81a.
, 81b is disengaged from the engagement member 83.

Since one of the shaft pins 32c and 33c of the support frames 32a and 33a is in elastic contact with one of the cam surfaces esc and s5d of the switching slide plate 85, the missing gear 81 is A rotational force is applied in the direction of the arrow in FIG. Therefore, by disengaging the engagement, the missing gear 81 is moved to the pinion gear 68.
It comes to be meshed with. Binion gear 68 is motor 2
5, the toothless gear 81 meshed with the toothless gear 81 is rotated so that the next toothless portion 81b faces the pinion gear 68 and the engagement member 83 engages with the locking recess 81e. It is carried out until This half-rotation of the missing gear 81 changes the position of the pin 81c on the missing gear 81 to which one end of the reverse arm 82 is connected, and the reverse arm 82 swings accordingly and is connected to the other end. The switching slide rate 85 is moved.

By this movement of the switching slide plate 85, the positions of the cam surfaces 85a, 85b, 85c, and 85d thereon change.
As a result, the pinch roller 33 that had been in pressure contact with the capstan 16 is released, and the pinch roller 32 is brought into pressure contact with the capstan 15 instead, and the idler that had been in mesh with the gear 6C of the reel stand 6 is released. The gear 18 is removed, and the idler gear 1 is attached to the gear 5C of the reel stand 5.
7 are engaged, and the tape running direction is switched.

Furthermore, the slide switch 86 is switched by the movement of the slide plate 85, and the channel of the head 31 is also switched.

Note that before the engaging member 83 engages with the next locking recess ate, the driven pin 65e of the detection arm 65 is connected to the drive cam 67b.
Since the switching arm 73 has returned to its original position, the toothless gear 81 can be reliably stopped at the position where the toothless portion 81b faces the pinion gear 68.

Note that, as described above, the engaging member 83 once enters the locking recess 81d.
When it is released from the cam surface 81e, it remains on the cam surface 81f until it is engaged with the next locking recess 81e, so the muting state is maintained until the reverse operation is completed.

<Auto shaft off operation> When the end of the tape is detected during the REW and FF operations described above and the detection arm 65 is rotated significantly, the drive pin 65d on the detection arm abuts the hook portion 72a of the intermediate arm 72. to move the intermediate arm 72. At this time, the switching arm 73 also moves, but since the switching arm 73 is at the position indicated by the solid line in FIG. . This switch 92 is connected in parallel with a switch 94 to form a power supply circuit for the motor 25.

By moving the intermediate arm 72, the upright piece 72C engages with the arm portion 53d of the release arm 53d, thereby rotating the release arm 53d. This rotation of the release arm 53d causes the lock plate 50 to move against the spring 22 by coming into contact with the arm portion 53C. When the lock plate 50 moves, the REW lever 40 or the FF lever 42, which had been held in a pressed state by the plate 50, is unlocked and returns to its original state. When the lever returns, the tape rewinding or fast forwarding operation that was being performed up to that point is stopped.

Further, when the lever returns, the slide plate 52 also returns, and the switch 94, which had been on until then, is turned off. However, while the switching arm 73 is moving, that is, the driven pin 65e on the detection arm 65
While the user is riding on the vehicle, the switch 92 is kept on by the switching arm 73, and the rotation of the motor 25 is maintained.

Thereafter, the driven pin 65e is removed from the drive cam 67b, the switching arm 73 returns to its original position, and the switch 92 is turned off, at which point the rotation of the motor 25 is stopped and all operations are completed.

<Manual Reverse Operation> When switching the tape playback direction at any time during playback operation, press the reverse button 47 and move the lever 46, so that the tapered surface 46a moves against the upright piece 1 of the reversing arm 102.
02b and rotates the reversing arm 102. As the arm 102 rotates, the upright piece 102a at one end of the arm hits the short portion 13e of the engagement hole 73f and moves the switching arm 73, and the same operation as in auto-reverse is performed to switch the tape running direction. will be held.

[Effects of the Invention] As explained above, according to the present invention, the member connected to the reel shaft through a friction mechanism receives rotational force while the reel shaft is rotating, and the rotation of the reel shaft stops at the end of the tape. In this system, the end of the tape is detected by taking advantage of the fact that rotational force is no longer applied to both reel shafts, and an arm member that connects both reel shafts with a friction mechanism is connected by a connecting member, and this member connects the reel shaft with a friction mechanism. The moving force received from the reel shaft is applied to the detection member as a rotational force in one direction, and the detection member no longer receives the rotational force to detect the end of the tape. This eliminates the possibility of mistakenly detecting the end of a tape other than at the end of the tape where rotation is suddenly stopped.

[Brief explanation of the drawing]

The drawing shows an embodiment of a tape player according to the invention,
Fig. 1 is a plan view showing the main parts of the present invention, Fig. 2 is a plan view mainly showing the tape drive system, Fig. 3 is a plan view mainly showing the tape running switching mechanism, and Fig. 4 mainly shows the tape drive system. FIG. 5 is a plan view mainly showing the stop and eject device, FIG. 6 is a plan view mainly showing the auto shaft off mechanism, and FIG. The figure is a plan view showing a part of the reverse mechanism. 4...Cassette tape, 5a, 6a...Reel shaft, 61.62...Back tension arm, 63...
・Connection arm, 63a, 63b...square hole, 65...
Detection arm, 65a, 65b...Protrusion, 65e...
- Driven pin, 67... cam gear, 67a... eccentric cam, 67b... drive cam. Figure 3

Claims (1)

[Claims] A cassette tape player capable of running cassette tapes in both directions, comprising an arm member connected to each of a pair of reel shafts via a friction mechanism, and both ends rotatably connected to the arm member. a connecting member, a pair of engaging portions provided at the center of the connecting member to be spaced apart in a direction intersecting the longitudinal direction of the connecting member, and a rotation fulcrum between the pair of engaging portions; a sensing member that is engaged with one of the pair of engaging portions to apply rotational force in one direction depending on the direction of movement of the connecting member when the connecting member is moved via a friction mechanism caused by rotation of a shaft; A constantly rotating eccentric cam member is formed integrally with the eccentric cam member, and a part of the detection member comes into contact with the rotational force applied to the detection member, and after the rotational force to the detection member disappears, a drive unit that engages with the detection member and drives the detection member to rotate by a predetermined angle when a part of the detection member is separated from the eccentric cam member by a predetermined distance due to rotation of the eccentric cam member; 1. A cassette-type tape player comprising a tape end detection device configured to detect the end of a cassette tape by rotating a detection member through a predetermined angle.