JPH0516657Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder, and particularly to various mode switching means including a recording location detection mechanism.

Next, a cassette tape recorder according to an embodiment of the present invention will be explained with reference to the drawings. This tape recorder is equipped with (1) a cassette loading mechanism, (2) a playback mechanism, (3) a recording point detection mechanism, (4) a fast-forward/rewind mechanism, and (5) an eject mechanism. I will explain each item one by one. First, the cassette mounting mechanism will be described.

(1) Cassette installation mechanism Particularly, in-vehicle cassette tape recorders are operated by the operator while driving the vehicle, so simply pushing the cassette tape lightly into the cassette insertion slot automatically pulls the cassette inside and inserts it. The playback operation is performed by moving it to the performance position.
If you wish to stop playback and remove the cassette, simply press the eject switch, the operation will stop automatically, and the cassette will be removed from the playing position and half protruded into the cassette insertion slot. It is structured so that it can be taken out.

The specific structure of the cassette mounting mechanism will be explained with reference to the drawings. Figures 1 and 2 are a plan view and a side view showing the state before the cassette tape is pushed in, Figure 3 is an enlarged sectional view of the slider, and Figure 4 is an enlarged sectional view of the slider.
5 and 5 are a plan view and a side view showing the cassette tape mounted at the playing position, and FIG. 6 is a partial side view showing the cassette tape held at the playing position.

As shown in FIG. 1, a main switch 2, a main motor 3, side plates 4 and 5, and various mechanisms described later are attached and arranged at predetermined positions on the chassis 1. In addition, illustration of the main switch 2 and the main motor 3 is omitted in FIG.

In FIGS. 1 and 4, the distance between the side plates 4 and 5, which are arranged opposite to each other, is slightly wider than the vertical width of the cassette tape 6, and the cassette insertion opening 7 between the side plates 4 and 5 (see A cassette holder 8 is disposed on the main switch 2 side (see FIG. 1), and a holder pressing plate 9 is disposed on the main switch 2 side (see FIG. 1).

As shown in FIG. 6, a cassette receiving plate 10 is arranged below the cassette holder 8 at a predetermined interval, and the cassette holder 8 can move up and down relative to the cassette receiving plate 10. In order to smoothly guide the vertical movement of the cassette holder 8, a holder guide member 11 made of synthetic resin with a small coefficient of friction is attached to the inner surface of the side plate 5, as shown in FIGS. 1 and 4. The member 11 extends over the entire length of the vertical movement range of the cassette holder 8. Furthermore, a recessed portion 12 into which a portion of the holder guide member 11 is fitted is provided at a portion of the cassette holder 8 that faces the holder guide member 11. A penetrating rectangular hole 13 is bored in a portion of the cassette holder 8 near the holder pressing plate 9, and the tip V-shaped portion 15 of the leaf spring 14 attached to the top surface of the cassette holder 8 faces this hole 13. .

The aforementioned holder pressing plate 9 is rotatable downward around a base 16 (see Fig. 6) provided on the side of the main switch 2, and is always elastically held downward by a spring (not shown). energized. As shown in FIGS. 1 and 4, a slider guide groove 17 is provided approximately in the center of the holder pressing plate 9 in the same direction as the insertion/removal direction X of the cassette tape 6 (see FIG. 1). A small slider 18 made of synthetic resin is slidably supported.

As shown in FIG. 3, this slider 18 has a V-shaped engagement portion 19 that can engage with the V-shaped portion 15 of the leaf spring 14 at one end, and a cassette contact portion 20 that is vertically disposed at the other end. has been done. The distance between the lower protrusion 21 of the V-shaped engaging portion 19 and the cassette contact portion 20 is equal to the distance between the side surface 22 of the short side of the cassette tape 6 and the circumferential surface 23 of the drive shaft insertion hole near it. They almost match.

A free end of an insertion/removal lever 25 is rotatably connected to the upper surface of the slider 18 via a retaining pin 24 . As shown in FIGS. 1 and 4, the base of the insertion/removal lever 25 is rotatably supported by the side plate 4 via a pin 26, and a first coil spring 27 and a second coil spring 28 are attached to the base. One end is locked. The other end of the first coil spring 27 is connected to the second coil spring 27.
As shown in FIG. 5, the second coil spring 28 is connected to the side plate 4, while the other end of the second coil spring 28 is connected to the horizontal portion 30 of the eject lever 29. A circular arc groove 31 centered around the pin 26 is formed in the horizontal portion 30, and a connecting pin 32 that connects the second coil spring 28 and the insertion/removal lever 25 is movably inserted into the circular groove 31.

7 and 8 show the eject lever 29.
FIG. The eject lever 29 has the above-mentioned horizontal part 30 and a vertical part 33 extending in the longitudinal direction thereof, and as shown in FIG.
4, and there is also a stepped guide groove 3 at an intermediate position between these.
5 are formed respectively. In addition, the vertical portion 33
A spring hook protrusion 36 is bored at approximately the center of the upper end of the spring hook 36, and a slightly rearward side of the spring hook protrusion 36 is bent inward in a step-like manner as shown in FIG.

Therefore, when this eject lever 29 is assembled into a tape recorder, as shown in FIGS. 1 and 4, the side of the vertical portion 33 on which the spring hooking protrusion 36 is provided is located on the outside of the side plate 4. The side on which the horizontal portion 30 is provided is arranged inside the side plate 4. For this purpose, a part of the vertical portion 33 passes through the intermediate portion of the side plate 4, and the eject lever 29 is moved in the X direction (the first direction).
A recess (not shown) is provided to allow movement of the material (see figure). A tension spring 38 is stretched between the spring hooking protrusion 36 of the eject lever 29 and the spring hooking protrusion 37 provided at one end of the side plate 4, so that the eject lever 29 is always elastically biased in one direction. . As shown in FIGS. 2 and 5, two guide pins 39 are protruded from predetermined positions on the side plate 4, and are inserted into the elongated holes 34 of the eject lever 29 to Guides directional movement.

In addition, there is a lifting pin 40 on the side of the cassette holder 8.
is inserted from the stepped guide groove 35 of the eject lever 29 into a longitudinal groove-shaped notch 41 formed in the side plate 4.

Before the cassette tape 6 is pushed into the tape recorder, as shown in FIG.
Therefore, as shown by the broken line in FIG. 6, the cassette holder 8 is in the upper position and the holder pressing plate 9 is in a horizontal position. Furthermore, the free ends of the slider 18 and the insertion/removal lever 25 are located near the cassette holder 8 and are in a standby state, as shown by solid lines in FIG. At this time, the third
As shown in the figure, the V-shaped engaging portion 19 of the slider 18 is
It is located below the V-shaped portion 15 of the leaf spring 14 and engages with it. Further, as shown in FIG. 2, the eject lever 29 is positioned to the right of the guide pin 39 as viewed in the figure.

As shown in FIG. 1, the cassette tape 6 is inserted from the cassette insertion opening 7 toward the cassette holder 8 so that its magnetic head insertion opening (not shown) side faces the side plate 5. Then, as shown in FIG. 3, when the side plate 22 on the short side of the cassette tape 6 comes into contact with the cassette abutting portion 20 of the slider 18, the cassette tape 6 is continuously pressed, and the first
The insertion/removal lever 25 rotates counterclockwise about the pin 26 against the elasticity of the coil spring 27 and the second coil spring 28, and the slider 18 moves along the slider guide groove 17.

When the insertion/removal lever 25 begins to rotate counterclockwise, the locking end (movable end) on the insertion/removal lever side of the first coil spring 27 gradually approaches the locking end (fixed end) on the side plate side, and the insertion/removal lever 25 begins to rotate counterclockwise. When the release lever 25 reaches about half of its allowable rotation range (approximately 40 to 60 degrees), both locking ends come closest and the repulsive force of the first coil spring 27 becomes maximum. After this midpoint has passed, the direction of the first coil spring 27 changes (see FIG. 4), and its repulsive force helps rotate the insertion/removal lever 25 (sliding the slider 18).

On the other hand, since the connecting pin 32 moves along the arcuate groove 31, the rotation of the insertion/removal lever 25 causes the locking end of the second coil spring 28 on the insertion/removal lever side (the connecting pin 32
side) gradually approaches the locking end on the eject lever side, and the repulsive force of the second coil spring 28 is accumulated. When the insertion/removal lever 25 rotates further and the locking end on the insertion/removal lever side passes the closest position (straight side) to the locking end on the ejection lever side, the accumulated repulsive force is applied to the rotation of the insertion/removal lever 25. Movement (sliding movement of slider 18)
In addition, the repulsive force of the second coil spring 28 elastically urges the eject lever 29 toward the cassette insertion port 7 side. In this way, when both the first coil spring 27 and the second coil spring 28 pass a predetermined position, the insertion/removal lever 25 automatically rotates due to the repulsive force accumulated therein, and eventually moves downward as shown in FIG. The cassette tape 6 sandwiched between the side protrusion 21 and the cassette contact portion 20 is automatically drawn into the cassette holder 8.

The holder pressing plate 9 is elastically biased to push the cassette holder 8 downward by a spring member (not shown), and the eject lever 29 is constantly pulled toward the cassette insertion port 7 by a tension spring 38. Furthermore, until the locking end on the insertion/removal lever side of the second coil spring 28 comes closest to the locking end on the eject lever side, the spring force of the second coil spring 28 against the eject lever 29 is different from the direction in which the tension spring 38 is pulled. It acts in the opposite direction to stop the movement of the eject lever 29 and maintain the upper position of the cassette holder 8. However, when the locking end on the insertion/removal lever side passes the locking end on the eject lever side, that is, the shortest approach position between both locking ends, the repulsive force accumulated in the second coil spring 28 is applied to the eject lever 29. On the other hand, it acts in the tensioning direction of the tension spring 38. Then, the second coil spring 28 and the tension spring 38 work together to move the eject lever 29 toward the cassette insertion slot 7, so that the cassette holder 8
The elevating pin 40 connected to the ejector lever 29 moves relatively to the lower part through the inclined portion in the stepped guide groove 35 of the eject lever 29. At this time, the notch 41 of the side plate 4 prevents the horizontal movement of the elevating pin 40 and only allows it to descend. Accordingly, as the eject lever 29 moves, the cassette holder 8 loses its support in the stepped guide groove 35 and is pushed down to the playing position by the holder pressing plate 9 (see FIGS. 4, 5, and 6). (see figure).

As explained above, in the tape recorder of the present invention, when the cassette tape 6 is pushed to a certain position, the cassette tape 6 is automatically taken in by the action of the first coil spring 27 and the second coil spring 28. can be lowered to the playing position. Next, a playback mechanism for performing performance operations will be explained.

(2) Playback Mechanism Before explaining the playback mechanism, first, the general driving force transmission system of the tape recorder will be explained using FIG. 9.

A drive pulley 42 is connected to the rotating shaft of the main motor 3, and the left and right flywheels 43, 4 are connected to the drive pulley 42.
An endless belt 46 is stretched between the guide pulley 4 and the guide pulley 45 as shown in the figure. Reel gears 47 and 48 are provided on the left and right to correspond to the flywheels 43 and 44, and an idle gear 49 is arranged between the flywheels 43 and 44 and the reel gears 47 and 48 so as to be able to move slightly in the left and right direction. .

Since the belt 46 is stretched as shown in the figure, the left and right flywheels 43 and 44 are always rotating in opposite directions, and both flywheels 4
Spur tooth portions are formed on the outer peripheries of the gears 3 and 44, respectively, so that they can mesh with the idle gear 49.

In the state shown in FIG. 9, the idle gear 49 is closer to the right end in the drawing and is engaged with the flywheel 44 and reel gear 48, so the rotational driving force of the main motor 3 is transmitted to the belt 46, the flywheel 44, and the idle gear 49. The signal is transmitted to the reel gear 48 via the reel gear 48, and the reel gear 48 rotates in the tape winding direction. At this time, reel gear 4
7, no driving force is transmitted to it.

When the idle gear 49 moves to the left end and meshes with the flywheel 43 and reel gear 47, the rotational driving force of the main motor 3 is transmitted to the reel gear 47 via the belt 46, flywheel 43 and idle gear 49, and the reel gear 47 rotates in the tape winding direction, and no driving force is transmitted to the reel gear 48.

Also, the idle gear 49 is the flywheel 43,
44, the idle gear 49
The reel gears 47 and 48 do not mesh with either of the flywheels 43 and 44, and therefore both reel gears 47 and 48 do not rotate. Note that the specific movement of the idle gear 49 will be detailed later.

As shown in FIG. 10, above the chassis 1,
A frame-shaped head base 50 is movably arranged,
Two return springs 51 hung at predetermined positions on the left and right
It is always pulled toward the pose position (toward the front in the drawing).

FIG. 12 is a plan view of the head base 50, which is composed of a single metal plate. A large opening 52 is provided approximately in the center of the head base 50, and on both sides thereof are elongated head base stopper grooves 53 extending in the direction of movement of the head base 50.
are formed respectively. Pin-shaped head base guides 54 are protruded from predetermined positions on the front side and the far side of the head base 50, respectively, and these are inserted into head base guide grooves 55 formed in the chassis 1, as shown in FIG. has been done. 56 is a magnetic head mounting hole, and the first
As shown in Figure 0, a magnetic head 57 is fixed facing the opening 52 side.

An arm support shaft 58, which also serves as a stopper pin, passes through each of the head base stopper grooves 53, and a pinch roller arm 6 rotatably supports a pinch roller 59 on the arm support shaft 58.
0 is connected. Capstans 61 are erected to correspond to the left and right pinch rollers 59, respectively, and these also serve as rotational axes for the flywheels 43 and 44, as shown in FIG. As shown in the figure, an annular V-groove 6 into which the belt 46 is fitted is formed on the outer periphery of the flywheels 43 and 44.
2 is formed, and a flywheel large-diameter gear 63 and a flywheel small-diameter gear 64 are provided above it.

As shown in FIG. 14, a pinch lever 65 that rotates around the capstan 61 is arranged below the capstan 61. This pinch lever 65 has an arm portion extending toward the pinch roller 59 side, and a pinch roller guide groove 65 is formed therein for changing the position of the pinch roller 59 depending on the mode of use. A shaft 67 is inserted. Also pinch lever 65
has an arm portion extending toward the reel gears 47, 48, and a take-up gear 68 which is always in mesh with the flywheel small diameter gear 64 and can be engaged with the reel gears 47, 48 is rotatably supported there.

Below the magnetic head 57 of the head base 50, a normal/reverse travel direction switching lever 69 and a head retraction lever 70 are arranged substantially overlapping each other.

As shown in FIG. 15, the normal/reverse travel direction switching lever 69 has guide elongated holes 71 formed near both ends thereof, and the arm support shaft 5
8 are inserted through each. A trapezoidal hole 72 having a substantially trapezoidal shape is provided symmetrically slightly inside each elongated hole 71, into which the roller support shaft 67 of the pinch roller 59 is inserted with a considerable margin, and the pinch lever 65 is inserted into the trapezoidal hole 72 with a considerable margin. It corresponds to the pinch roller guide groove 66. At the right end of the switching lever 69 as viewed in the drawing, there is a driver locking portion 7.
3 is provided and adapted to engage the switch driver 74. This switch driver 74 is rotatably supported and engaged with a position detection switch. Also, the lever drive solenoid 7
Reference numeral 5 has a mechanism (not shown) that alternately moves the switching lever 69 to the right end or the left end in the drawing and waits each time the switching lever 69 is energized once.

As shown in FIG. 16, the head retraction lever 70 has a relatively large opening 77 having a chevron-shaped retraction cam end face 76 formed in a symmetrical position laterally. A lock groove 79 having lock recesses 78 at both ends is provided between both openings 77, and a three-stage idle gear drive cam groove 80 is provided in front of the lock groove 79.
The idle gear drive cam groove 80 includes a first cam groove 80a, a second cam groove 80b, and a third cam groove 8, which extend linearly in the moving direction of the head retraction lever 70.
0c, and two inclined cam grooves that connect these cam grooves. Note that the cam groove 80
a, 80b, and 80c are for changing the position of the idle gear 4 drive and holding it at that position as described later, and the first cam groove 80a is at the farthest side, the second cam groove 80b is at the middle position, Third cam groove 80c
is formed closest to you. In addition, completely opposite to this, the first cam groove 80a is the closest side, and the second cam groove 80a is
The cam groove 80b may be at the intermediate position, and the third cam groove 80c may be at the farthest side.

Elongated guide grooves 81 are formed on the front sides of the left and right openings 77, respectively. The opening 77, the lock groove 79, the idle gear drive cam groove 80, and the guide groove 81 are formed along the longitudinal direction of the head retraction lever 70 to allow the head retraction lever 70 to move in the left and right direction. There is.

A tolerance groove 82 is provided at the left end of the head retraction lever 70 when viewed in the drawing, and extends in a direction perpendicular to the longitudinal direction of the head retraction lever 70.
A protrusion 84 is inserted. swing lever 8
3 is arranged so as to rotate by a predetermined angle about the base shaft 85, and has a deformable tooth portion formed on its free end side, and its shape will be explained using FIG. 17. The entire tooth portion 86 is formed into a fan shape, and a central tooth portion 86a having a normal shape is provided at the center thereof, and small tooth portions 86b are formed on both sides of the central tooth portion 86a. This small tooth portion 86b is formed in such a manner that a portion of the RF gear 87 that faces the tooth portion 86 and overlaps with the tip circle of the small diameter gear 88 is cut off. A tooth portion having a normal shape is formed on the outside of the small tooth portion 86b. The small diameter gear 88 of the RF gear 87 is provided with a toothless portion 89 extending approximately 180 degrees in the circumferential direction. RF gear 87 has small diameter gear 88
In addition, a large-diameter gear 90 is provided, and although not shown, it is configured to transmit the rotation of the FF/REW drive motor to the small-diameter gear 88.

The tip of the RF lock lever 93 is disposed above the lock groove 79 of the head retract lever 70.
The lock pin 94 protruding from the tip of the lever is inserted into the lock groove 79.
is rotatable about a lever shaft 95 , and its base end is connected to an RF lock solenoid 97 via a connecting lever 96 .

Above the idle gear drive cam groove 80,
One end of a first drive lever 98 having a substantially L-shape is disposed, and a drive pin 99 protruding from the tip thereof is inserted into the idle gear drive cam groove 80.
The first drive lever 98 is rotatable about a shaft 100, and the other end is bendably connected to the second drive lever 101. An oval-shaped through hole 102 is bored at approximately the midpoint in the longitudinal direction of the second drive lever 101, into which a stud 103 protruding from the chassis 1 is inserted, and the second drive lever 101 is centered around this hole. Rotate. Second drive lever 101
An idle gear 49 is rotatably supported at the free end of the chassis 1 via a support pin 104, and one end of the support pin 104 is inserted into an elongated stopper groove 105 provided in the chassis 1.

The idle gear 49 has three positions depending on the mode: a position where the idle gear 49 meshes with the left reel gear 47, a position where the idle gear 49 does not mesh with either of the reel gears 47 and 48, and a position where the idle gear 49 meshes with the right reel gear 48. It has a location.

A first biasing member 106 and a second biasing member 107 are slidably disposed on the left and right guide grooves 81 of the head retraction lever 70, respectively. A large slit 108, a small slit 109, and a spring hook protrusion 110 are formed symmetrically on each of these biasing members 106 and 107. The large slit 108 is the guide groove 8
A stopper pin 111 located above the large slit 10 and having a shorter slit length than the guide groove 81 and protruding from the chassis 1 moves from the guide groove 81 to the large slit 10.
It penetrates by 8. A small projection 112 cut and raised from the head retraction lever 70 is inserted into the small slit 109. A tension spring 113 is stretched between the left and right centering members 106, 107.

A cam surface 140 for retracting the head base 50 is provided at approximately the center of the front end surface of the head retraction lever 70, and this cam surface 114 has a performance position cam surface 140a and a sense position cam surface 140.
b, and an inclined cam surface 140c connecting both cam surfaces 140a and 140b. A head base guide 54 protruding from the head base 50 is in contact with this cam surface 140.

FIG. 18 shows the control rotary body 1 from the drive gear 114.
FIG. 15 is an explanatory diagram showing up to 15 driving force transmission systems.
The drive gear 114 is the drive pulley 42 (see Figure 9).
The main motor 3 rotates in the direction of the arrow. A first idler 116 and a second idler 117 are arranged between the drive gear 114 and the control rotating body 115, and the rotational force of the main motor 3 is controlled via the drive gear 114, the first idler 116, and the second idler 117. is transmitted to the rotating body 115 and the control rotating body 11
5 rotates in the direction of the arrow.

FIGS. 19A and 19B are a plan view and a bottom view of the control rotating body 115. As shown in FIG. 5A, an annular portion 118 is integrally provided on the upper surface of the control rotary body 115, while a rotary cam 119 is integrally provided on the lower surface as shown in FIG. Annular part 118
A spur tooth portion 121 having a partially toothless portion 120 is formed at an axially intermediate position of the rotary cam 119 . As shown in FIG. 20A, a stopper protrusion 122 is provided on the outer periphery of the annular portion 118, and this protrusion 122 is attached to the first stop piece 124 or the second stop piece of the stop lever 123 depending on the mode as shown in FIG. 125. The stop lever 123 rotates around a support shaft 126 by a spring (not shown) while constantly applying a moment to rotate clockwise. A circular solenoid connection portion 127 is formed. This connecting portion 127 is
It is held between the actuator 138 of the stop lever rotation solenoid 137.

As shown in FIG. 19B, the circumferential surface of the rotary cam 119 includes a spiral rotary cam surface 119a, a return cam surface 119b connected to the spiral rotary cam surface 119a, and a return cam surface 119b.
The recessed cam surface 119c is provided between the terminal end of the rotary cam surface 119a and the starting end of the rotary cam surface 119a and is closest to the center of rotation.

As shown in FIG. 21, the cam contact portion 129 of the first base advancement lever 128 is always in contact with the cam surface of the rotary cam 119. A spring hook part 130 is provided on the opposite side of the base advancement first lever 128 from the cam contact part 129. A second base advancement lever 131 is placed on the first base advancement lever 128, and both of these levers are configured to rotate around a rotation shaft 132. A spring hook 133 is provided at the free end of the second base advancement lever 131, and a tension spring 134 is stretched between it and the spring hook 130 of the first base advancement lever 128. Base forward 2nd
The lever 131 has a contact part 135 in the middle part thereof that comes into contact with the head base guide 54 bored in the head base 50.
It is in contact with 4.

The operation from when the cassette tape 6 is installed at the performance position until it is played (reproduced) will be explained below.Prior to that, the state of each part before moving on to the above operation will be briefly explained.

First, regarding the position of the head base 50, this is located at the frontmost side as in FIG.
The magnetic head 57 is also separated from the magnetic tape 136 in the cassette tape 6. Also, as in FIG.
19c, and therefore the free ends (spring hooks 130, 133) of the first base advancement lever 128 and the second base advancement lever 131 are stationary at the position closest to the reel gears 47, 48.
The control rotary body 115 is in a state where the second stop piece 125 and the stopper protrusion 122 are engaged, as shown by the dotted line in FIG. The starting end side of the spur tooth portion 121 is held in a state immediately before meshing with the tooth portion of the second idler 117.

As explained in the above-mentioned cassette mounting mechanism, as the cassette tape 6 is inserted, the insertion/removal lever 25 is moved.
Since the eject lever 29 moves, either movement is detected mechanically or optically,
This turns on the main switch 2 (see FIG. 1). With this ON signal, the main motor 2 starts to rotate, and the solenoid 137 (see FIG. 20) is energized and excited to stop the second stop piece 125.
is disengaged, and the control rotary body 115 is rotated clockwise by the spring so that the starting end side of the spur tooth portion 121 is in the second position.
It meshes with the teeth of the idler 117, and as shown in FIG. 18, the control rotating body 115 is rotated in the direction of the arrow through the drive gear 114, the first idler, and the second idler 117 by the meshing of the gears. With this rotation, the cam contact portion 129 of the first base advancement lever 128 moves from the concave cam surface 119c to the rotating cam surface 119a, and slides on the rotating cam surface 119a that expands in a spiral shape. As a result of this sliding, the base advancement first lever 128 rotates counterclockwise about the rotation shaft 132 as shown in FIG. Lever 131 also rotates in the same direction.
As the second base advancement lever 131 rotates, the head base 50 moves forward via the head base guide 54 against the elasticity of the return spring 51.

As shown in FIG. 18, the terminal end side of the spur tooth portion 121 in the control rotating body 115
When the head base 50 is released from the base, the cam contact portion 129 of the first base advancement lever 128 is in contact with the end of the rotating cam surface 119a, and the head base 50 is therefore in the most advanced position. On the other hand, since the stop lever rotation solenoid 137 shown in FIG. When it is engaged with the piece 124, it will be in the state shown in FIG. 18, and will be locked in this state. Note that since the toothed portion of the second idler 117 is separated from the spur toothed portion 121 and faces the toothless portion 120, the rotational force of the main motor 3 is transferred to the control rotating body 11.
It will not be communicated to 5.

In this case, the normal/reverse running direction switching lever 69 can be positioned on either the normal side or the reverse side, but it is assumed that the lever 69 is held in the position shown in FIG. 15 (the lever 69 is on the right side, on the normal running side). Therefore, since the roller support shaft 67 on the left side in the figure is in contact with the locking step 139 of the left trapezoidal hole 72 in the normal/reverse running direction switching lever 69, the pinch roller 59 on the left side as shown in FIG. is far from Capstan 61. Further, as described above, the left pinch lever 65 has its roller support shaft 67 in contact with the locking stepped portion 139 and rotation of the pinch lever 65 is restricted, so the take-up gear 68 supported at one end thereof is apart from the left reel gear 47, and therefore no driving force is transmitted.

On the other hand, the roller support shaft 67 on the right side in FIG.
does not butt against the locking step 139 of the right trapezoidal hole 72, but has advanced to near the upper edge of the trapezoidal hole 72. Therefore, as shown in FIG. It is elastically held between the two and sent in a predetermined direction at a constant speed. Further, the right roller support shaft 67 is located at the end of the pinch roller guide groove 66 closer to the capstan 61, and the right take-up gear 68 meshes with the reel gear 48 via the pinch lever 65.
As shown in FIG. 4, the rotational force of the flywheel small diameter gear 64 is transmitted to the reel gear 48 via the take-up gear 68. Although not shown, there is a reel stand above the reel gear 48, and by engaging one hub of the cassette tape 6 and rotating it, the magnetic tape 136 is wound.

Further, as the head base 50 moves forward, the magnetic head 57 enters a predetermined distance from the head insertion opening (not shown) of the cassette tape 6, and the magnetic tape 136 is inserted.
The regeneration operation is performed in close contact with the
(See Figure 14).

When the tape recorder is not in use or in the performance mode, the toothless portion 89 of the small diameter gear 88 faces the toothed portion 86 of the swing lever 83, as shown in FIGS. 11 and 16, and the two are in mesh with each other. Not related. As described above, as the head base 50 moves forward, the head base guide 54 on the near side comes into contact with the performance position cam surface 140a of the cam surface 140 of the head retraction lever 70, and the retraction lever 70 is held at the position shown in the figure. ing.

In this state, the lock pin 94 is at an intermediate position in the lock groove 79, and the RF lock solenoid 97 is not energized. Further, the drive pin 99 is connected to the second cam groove portion 80b in the middle of the idle gear drive cam groove 80.
Therefore, one arm portion of the first drive lever 98 and the second drive lever 101 are arranged in a substantially straight line, and therefore the support pin 104 is aligned with the stopper groove 1.
It is located approximately in the center of 05. Therefore, as shown in FIG. 11, the idle gear 49 does not mesh with either the flywheel large diameter gears 63 of the left or right flywheels 43, 44 or the left or right reel gears 47, 48. No driving force is transmitted via the.

Performance (reproduction) is performed in the state described above.
Next, the recording location detection mechanism will be explained.

(3) Recording location detection mechanism Among the multiple songs recorded on the magnetic tape,
In order to detect a desired song as quickly as possible, the pinch roller must be separated from the capstan, the reel (reel gear) must be rotated at high speed, and the magnetic head must be kept in contact with the magnetic tape. Regarding the position of the magnetic head at this time, the position where the magnetic head is most advanced as in the above-mentioned performance mode is not preferable because the magnetic tape and the magnetic head are subject to a lot of wear due to high-speed running of the magnetic tape. For this reason, in the tape recorder according to the present invention, the magnetic head is retracted to the extent that the recording signal can be detected by the mechanism described later, and the sliding resistance between it and the magnetic tape is minimized to minimize wear on both. are doing.

As a method for detecting recorded locations, a song interval detection method is generally used. This method magnetically detects the unrecorded area between songs when multiple songs are sequentially recorded on a magnetic tape, assumes that the previous song has ended, and then starts the next desired song. This is a recording point detection method that attempts to play the song from the beginning.

22 and 23 are diagrams showing the state of detecting the recorded position. In the above-mentioned playing state, as shown in Figs. 16 and 17, the missing tooth portion 89 of the small diameter gear 88 faces the tooth portion 86 of the swing lever 83, but based on a song interval detection signal from the control unit (not shown), the driving force of the motor is transmitted to the RF gear 87, which rotates, for example, in the counterclockwise direction. Then, the first tooth of the small diameter gear 88 contacts the swing lever 83.
The central tooth portion 86a of the third tooth portion 86 (see FIG. 17)
16, the head base guide 54 on the near side abuts against the playing position cam surface 140a, but as the head base guide 70 moves to the right, the inclined cam surface 140c abuts against the head base guide 54 and moves it backward. When the head base guide 54 moves to the right, the inclined cam surface 140c abuts against the playing position cam surface 140b, and moves it backward. When the head base guide 54 moves to the right as shown in FIG. 23, the head base guide 54 abuts against the playing position cam surface 140b, and moves it backward. When the head base guide 54 moves to the right as shown in FIG. 23, the head base guide 54 abuts against the sense position cam surface 140b, and is held in that position.

Since the head base guides 54 on the near side and the far side are connected to the head base 50, the above-mentioned head base guide 54 on the near side
By moving backward, the head base 50 also moves between the performance position cam surface 140a and the sense position cam surface 140b.
As shown in FIG.
It is in light contact with the magnetic tape 136.

When the head base 50 retreats, the head base guide 54 on the other side moves back while slightly rotating the second base advancement lever 131 clockwise against the elasticity of the tension spring 134. Note that the cam contact portion 129 of the first base forward lever 128 is in contact with the rotating cam 119, so even if the second base forward lever 131 rotates, the first base forward lever 128 remains in the playing state. With this state, the tension spring 134 is in a stretched state.

As the head retraction lever 70 moves, the lock pin 94 fits into one of the lock recesses 78 (see FIG. 16) of the lock groove 79 as shown in FIG. 23, and then the RF lock solenoid 97 is turned on and the connection lever 96 is pulled. The head retraction lever 7
0 through the magnetic head 57 (head base) 50
The position is maintained.

As mentioned above, the left and right openings 77 of the head retraction lever 70 have chevron-shaped retraction cam end surfaces 76 (the 16th
23), the movement of the head retraction lever 70 causes the right roller support shaft 67 to be pushed toward the front by the retraction cam end surface 76. As a result, the pinch roller arm 60 (see FIG. 22) rotates slightly counterclockwise about the roller support shaft 58, and the pinch roller 59 separates from the magnetic tape 136 as shown in the figure. Note that, as mentioned above, the left pinch roller 59 has already retreated during the performance mode, so it does not move at all when the head retreat lever 70 is moved this time, and is held in that position. .

As shown in FIG. 15, the roller support shaft 67 is inserted into the inclined pinch roller guide groove 66, so as the right roller support shaft 67 is pushed forward as described above, the pinch lever 65 is moved clockwise. As a result, the take-up gear 68 separates from the reel gear 48, the drive transmission to the reel gear 48 is cut off, and the running of the magnetic tape 136 is temporarily stopped.

In addition, as shown in FIG. 23, the head retraction lever 7
0 movement, the drive pin 99 moves to the leftmost first cam groove 80a of the idle gear drive cam groove 80.
(See FIG. 16), and as a result, the first drive lever 98 rotates slightly counterclockwise about the shaft 100. and a second drive lever 1 bendably connected thereto.
01 rotates slightly clockwise around the stud 103, and as a result, the idle gear 49
moves to the right end of the stopper groove 105, and at first,
The right flywheel 44 meshes with the flywheel large diameter gear 63 and rotates, and then the idle gear 4
9 meshes with the reel gear 48 on the right side. The meshing operation of the flywheel large-diameter gear 63, idle gear 49, and reel gear 48 will be explained in more detail. As shown in FIG. 16, the second drive lever 101 has an oval-shaped through-hole 102 and an elongated-shaped through-hole 102.
is formed, so when the second drive lever 101 is rotated in conjunction with the rotation of the first drive lever 98, the second drive lever 101 is pulled slightly toward the front along the through hole 102. It rotates while being stretched. Therefore, the idle gear 49 first engages with the flywheel large-diameter gear 63 on the front side and rotates, and as the second drive lever 101 subsequently rotates, it engages with the reel gear 48 and rotates it at high speed. The system is set up to do so. The rotational force of the flywheel 44, which is constantly rotating in this way, is transmitted to the reel gear 48 via the idle gear 49, and by rotating the reel gear 48 at high speed, the magnetic tape 136 is fast-forwarded in a short time. Detection between songs is performed.

As the head retraction lever 70 moves to the right, the small protrusion 112 on the right side comes into contact with the edge of the small slit 109 in the second shifting member 107 on the right side, as shown in FIG.
Move 7 to the right. On the other hand, since the edge of the large slit 108 of the first gathering member 106 on the left abuts against the stopper pin 111, movement to the right is prevented. In this way, since the first gathering member 106 is prevented from moving by the stopper pin 111, and the second gathering member 107 is moved by the small protrusion 112, the tension spring 11 connecting the two
3 is stretched to apply a force to return the head retract lever 70 to the center (pull force), but the return of the head retract lever 70 is prevented by the lock pin 94 being fitted.

When the song interval detection is performed in the state shown in FIGS. 22 and 23, the RF lock solenoid 97 is turned off based on the detection signal, the lock pin 94 comes out of the lock recess 78, and the head retraction lever 70
The locked state is released. and tension spring 11
The head retraction lever 70 is returned to its original center by the return force of step 3, and the head base guide 54 on the front side
Due to the tensile force of the tension spring 134, the head base guide 54 moves forward from the sense position cam surface 140b, passes through the inclined cam surface 140c, and comes into contact with the performance position cam surface 140a. Along with this forward movement, the head base 50 (magnetic head 57) also moves forward to the playing position, and the second base advancement lever 131 also rotates to the playing position.

In addition, when the head retraction lever 70 returns, the first drive lever 98 and the second drive lever 101 also rotate to their original positions, whereby the idle gear 49 is separated from the reel gear 48 and the flywheel large diameter gear 63, and the reel gear 48 is moved away from the idle gear 49. Drive transmission is temporarily interrupted.

Furthermore, when the head retraction lever 70 returns, the pressure on the right roller support shaft 67 by the retraction cam end face 76 is removed, so the roller support shaft 67 returns to its original position, and the magnetic tape 136 is placed between the pinch roller 59 and the capstan 61. It is held elastically between the Further, as the roller support shaft 67 returns, the pinch lever 65 rotates, whereby the take-up gear 68 meshes with the reel gear 48, and the reel gear 4
8 starts rotating, the magnetic tape 136 is wound up, and the selected song is played. Next, the fast forward/rewind mechanism will be explained.

(4) Fast-forward/rewind mechanism Based on the fast-forward signal or rewind signal from the control section, the stop lever rotation solenoid 137 shown in FIG. When the first stop piece 124 is rotated clockwise and the first stop piece 124 is released from the stopper protrusion 122, the tip of the second stop piece 125 enters the rotation locus of the stopper protrusion 122. The head base 50, which always tries to return to the backward position by the return spring 51, acts as a force to rotate the rotary cam 119 clockwise via the first base advancement lever 128, the second base advancement lever 131, and the tension spring 134. (See FIG. 21), when the stopper protrusion 122 and the first stop piece 124 are disengaged, the stopper protrusion 122 rotates to a position where it comes into contact with the second stop piece 125 as shown by the broken line. Stop at that position. In this manner, as the stopper protrusion 122 of the control rotary body 115 rotates from the position opposite to the first stop piece 124 to the position opposite to the second stop piece 125, the rotary cam 119 also rotates together.

FIG. 24 and FIG. 25 are diagrams showing fast forward/rewind states. Since the head base 50 is always pulled toward the front side by the return spring 51, the rotation of the aforementioned rotation cam 119 causes the base to move forward in the first direction.
Lever 128 and base advancement second lever 13
1, the cam contact portion 129 passes through the return cam surface 119b and enters the recessed cam surface 119c (see FIG. 25), and the head base 50 returns to the front side, as shown in FIG. As shown, the magnetic head 57 and the left and right pinch rollers 59 are separated from the magnetic tape 136, the take-up gear 68 is separated from the reel gears 48 and 47, and the running of the magnetic tape 136 is temporarily stopped.

The small diameter gear 88 of the RF gear 87 rotates based on a fast forward signal or a rewind signal from the control section.
FIG. 25 shows a case where the small diameter gear 88 rotates clockwise, and the head retraction lever 70 moves to the left based on this rotation, causing the left reel gear 47 to rotate at high speed.

That is, the swing lever 83 rotates in the direction of the arrow due to the rotation of the small diameter gear 88, and the head retraction lever 70
is pulled to the left. Left and right roller support shafts 6
7 moves toward the front side together with the head base 50 and separates from the retraction cam end face 76, so the roller support shaft 67 does not move due to the movement of the head retraction lever 70.

As the head retraction lever 70 moves to the left, the lock pin 94 enters the right lock recess 78 of the lock groove 79, and the RF lock solenoid 97 is energized to maintain the position of the head retraction lever 70. In addition, in FIG. 25, the RF lock lever 93 and the connection lever 9 are shown in order to simplify the drawing.
6 and RF lock solenoid 97 are omitted.

Further, as the head retraction lever 70 moves, the drive pin 99 enters the rightmost third cam groove 80c of the idle gear drive cam groove 80, and the first drive lever 98 moves clockwise around the shaft 100. Furthermore, the second drive lever 101
are rotated slightly counterclockwise about the stud 103. As a result, the idle gear 49 first meshes with the flywheel large diameter gear 63 of the left flywheel 43 and rotates, and then meshes with the left reel gear 47 to transmit driving force, and as the reel gear 47 rotates, The magnetic tape 136 can be wound at high speed.

As the head retraction lever 70 moves to the left, the small protrusion 112 on the left side comes into contact with the edge of the small slit 109 in the first gathering member 106 on the left side, as shown in FIG.
Move 6 to the left. On the other hand, since the edge of the large slit 108 of the second gathering member 107 on the right abuts against the stopper pin 111, movement to the left is prevented, and as a result, the tension spring 113
This stretching provides a force for returning the head retraction lever 70 to the center.

When the desired fast forwarding or rewinding of the magnetic tape 136 is completed in the state shown in FIGS. 24 and 25, the RF lock solenoid 97 is turned off based on the completion signal, and the lock pin 94 is moved into the lock recess 7.
8, and the locked state of the head retraction lever 70 is released. Then, the head retraction lever 70 is returned to the center by the return force of the tension spring 113, and this movement causes the first drive lever 98 and the second drive lever 101 to rotate, respectively, and as a result, the idle gear 49 moves the reel gear 47 and the flywheel. The wheel moves away from the large-diameter gear 63, and the drive transmission of the reel gear 47, that is, the high-speed running of the magnetic tape 136 stops. Next, the ejection mechanism will be explained.

(5) Eject mechanism When in the eject pose, as in (4) fast forward and rewind poses, when the stopper protrusion 122 engages with the second stop piece 125 as shown by the broken line in FIG. Control rotary body 115 is stopped. Therefore, as shown in FIG. 26, the cam contact portion 129 of the first base advancement lever 128 is inserted into the recessed cam surface 119c of the control rotary body 115. Therefore, the head base 50 has returned to the pose position on the front side, and the magnetic head 57 and the pinch rollers 59 on both sides are attached to the magnetic tape 13.
6, and the take-up gears 68 on both sides are separated from the reel gears 47 and 48, respectively.

In addition, the head retraction lever 70 is in the center position, and the idle gear 49 is connected to the flywheel 47.
and 48, and is in a state of non-meshing with any gear.

FIG. 27 is a diagram showing the state of the leaf switch drive mechanism before ejecting, and FIG. 28 is a diagram showing the opposing state of the second idler 117 and eject gear 149 before ejecting. As shown in FIG. 27, the actuator 142 of the ejector 141 includes:
A driving protrusion 145 is provided near the locking piece 144 to which the rear end locking piece 144 of the switch lever 143 is removably locked.
It is engaged with the operating piece 147 of 46. A stopper pawl 148 is formed at the tip of the switch lever 143, and this is connected to the locking groove 15 of the eject gear 149.
It seems to be stuck at 0.

A trigger lever 151 is arranged above the switch lever 143, and its base and an intermediate portion of the switch lever 143 are rotatably supported by a common support shaft 152. trigger lever 151
is always urged to rotate counterclockwise by a tension spring 153. A pressing groove 154 is provided on the free end side of the trigger lever 151, and an arc-shaped guide edge 155 is formed from there toward the tip side.

29A and 29B are a plan view and a bottom view of the eject gear 149. Eject gear 14
A small cylindrical portion 156 is formed at the center of the upper surface of 9, and one trigger tooth 157 is provided to protrude radially outward from the circumferential surface of the small cylindrical portion 156. A large cylindrical portion 158 is provided below the small cylindrical portion 156, and one locking groove 150 is formed in the circumferential surface of the large cylindrical portion 158. A spur-shaped driving tooth portion 160 having a partially toothed portion 159 is formed below the large cylinder portion 158, and further below that, that is, on the back side of the eject gear 149, a small diameter tooth portion 162 having a toothless portion 161 is formed. It is formed. The drive tooth portion 160 is capable of meshing with a small diameter gear 163 of the second idler 117, as shown in FIG. Further, the small diameter tooth portion 162 has a second
As shown in FIGS. 5, 5, and 31, the eject lever 29 can be engaged with a lock tooth 164 attached to the side surface of the eject lever 29.

As shown in FIG. 31, a part of the eject lever 29 is engaged with a main switch lever 165, so that the main switch 2 is turned on and off by rotation of the main switch lever 165.

FIG. 27, FIG. 28, and FIG. 31 each show the state before ejection. In this state, the eject solenoid 141 is not energized, the leaf switch 146 is also turned off, and the stopper claw 148 has entered the locking groove 150, so the rotation of the eject gear 149 is prevented (the (See Figure 27). Furthermore, as shown in FIG. 28, the toothless portion 15 of the eject gear 149
9 faces the small diameter gear 163 of the second idler 117, and the main motor 3 (drive gear 114)
No driving force is transmitted from the Further, as shown in FIG. 31, the missing tooth portion 161 of the small diameter tooth portion 162 faces the rack tooth 164.

When the operator presses an eject button (not shown) to eject, the operation is detected and an eject signal is output from the control section, and the eject solenoid 141 is energized based on the signal. This excitation attracts the actuator 142, thereby causing the switch lever 143 to rotate counterclockwise around the shared support shaft 152.
With this rotation, the operating piece 147 of the leaf switch 146
is pushed away, and the leaf switch 146 is turned on. Also, as the switch lever 143 rotates, the stopper pawl 148 engages the locking groove 15 of the eject gear 149.
By escaping from 0, Eject Gear 14
9 becomes rotatable, and the eject gear 149 is slightly rotated by the pressing force of the trigger lever 151 via the trigger teeth 157. With this rotational movement, the toothless portion 159 of the eject gear 149 and the small diameter gear 163 of the second idler 117 are disengaged from each other, and the drive tooth portion 160 of the eject gear 149 meshes with the small diameter gear 163, and the eject gear 149 is moved to the second position by transmission of driving force. Rotate in the clockwise direction of the arrow as shown in Figure 30.

The eject solenoid 141 is energized for a short time when ejecting is started, but after that it is not energized and its actuator 142 is energized as shown in FIG.
is separated from the rear end locking piece 144 and returns to its original position.
After the stopper pawl 148 comes out of the locking groove 150, it slides on the circumferential surface of the large cylindrical portion 158 of the eject gear 149, so the switch lever 143 and the operating piece 147 remain in the same state, and the leaf switch 146 is turned on. It remains as it is. On the other hand, the trigger lever 151 is
54 is disengaged from the trigger tooth 157, it rotates counterclockwise by the tension spring 153, but the rotation stops when the guide edge 155 comes into contact with the circumferential surface of the small cylinder portion 156. are doing.

Further, as the eject gear 149 rotates, the small diameter tooth portion 162 (see FIG. 31)
64 and moves the eject lever 29 in the direction of the arrow, thereby rotating the main switch lever 165 and turning off the main switch 2.

FIG. 5 shows the state in which the cassette tape 6 is in the playing position, and this state is the same before ejecting. With the movement of the ejection lever 29 mentioned above, the lifting pin 40 connected to the cassette holder 8 is pushed up by the guide of the stepped guide groove 35 and the notch 41, and the cassette holder 8 and the holder pressing plate 9 are moved to the sixth position. Move to the upper position as shown by the broken line in the figure.

Also, before ejecting, the insertion/ejection lever 25 is at the farthest right position as shown in Figure 4, but it is automatically moved as the ejection lever 29 moves, completely opposite to when the cassette tape 6 is installed as described above. Specifically, the insertion/removal lever 25 rotates clockwise about the pin 26 as a fulcrum. By this rotation, the cassette tape 6 is pushed out by the slider 18 to the position shown in FIG. 1, and is held at a position where it does not fall off from the tape recorder and can be easily taken out.

Even when the ejecting of the cassette tape 6 is finished in this manner, the eject gear 149 continues to rotate, and its trigger teeth 157 enter the inside of the guide edge 155 to push the trigger lever 151 against the elasticity of the tension spring 153. Rotate clockwise to return. When the stopper pawl 148 falls down to face the locking groove 150, the trigger tooth 157 enters the pressing groove 154, and one rotation of the eject gear 149 is completed. As described above, when the stopper pawl 148 falls into the locking groove 150, the switch lever 143 rotates, and along with this, the operating piece 147 also returns to rotation and the leaf switch 146 is turned off. Based on the off signal from the leaf switch 146, the main motor 3 is turned off and its rotation is stopped.

FIG. 32 is a timing chart of the eject operation described above. As shown in this figure, when you press the eject button, the eject lever moves and
This turns off the main switch, the cassette tape is ejected by the subsequent movement of the eject lever, and then the leaf switch is turned off, and the main motor is turned off with the AND condition of the main switch off and the leaf switch off. It's a system.

In this embodiment, a cassette-type tape recorder exclusively for performance (playback) has been described, but it goes without saying that the present invention can also be applied to a cassette-type tape recorder that can record and play back.

As explained above, according to the present invention, the levers and the like are arranged one on top of the other, so the moving position of the pinch roller can be adjusted between the simple grooves and the grooves, without creating a complicated structure like in the past. This is determined by the engaging regulating member, and the structure can be simplified.

[Brief explanation of the drawing]

All figures are diagrams for explaining a cassette-type tape recorder according to an embodiment of the present invention. Figures 1 and 2 are a plan view and a side view showing the state before the cassette tape is pushed in, Figure 3 is an enlarged sectional view of the slider, and Figures 4 and 5 show the cassette tape in the playing position. FIG. 6 is a partial side view showing the cassette tape held in the playing position;
Figures 7 and 8 are a plan view and side view of the eject lever, Figure 9 is a partial bottom view showing the drive force transmission system, Figure 10 is a plan view of the main part in the playing state, and Figure 11 is the same. 12 is a plan view of the head base, FIG. 13 is a sectional view of the flywheel, FIG. 14 is an explanatory diagram showing the positional relationship between the pinch roller arm and the pinch lever in the playing state, and FIG. Figure 15 is an explanatory diagram showing the positional relationship between the pinch lever, roller support shaft, and normal/reverse running direction switching lever in the playing state, and Figure 16 is an explanatory diagram showing the positional relationship between the head retraction lever and other members in the playing state. Figure, No. 17
The figure is an enlarged plan view of the swing lever and RF gear, Figure 18 is an explanatory diagram showing the driving force transmission system from the drive gear to the control rotary body, Figures 19 A and B are a plan view and bottom view of the control rotary body, Fig. 20 is an explanatory diagram showing the function of the stop lever, Fig. 21 is a rotating cam,
An explanatory view showing the functions of the first base advancement lever and the second base advancement lever, FIG. 22 is a plan view of the main part in the recording location detection state, FIG. 23 is a bottom view of the essential part in the recording location detection state, and FIG. 24 is a plan view of main parts in fast forward and rewind state, No. 25
The figures are also bottom views of the main parts in the fast forward and rewind states, Fig. 26 is a top view of the main parts in the eject state, Fig. 27 is an explanatory diagram showing the state of the leaf switch drive mechanism before ejecting, and Fig. 28 is before ejecting. 29A and 29B are plan and bottom views of the eject gear, FIG. 30 is an explanatory diagram showing the state of the leaf switch drive mechanism during ejection, and FIG. 31 32 is an explanatory diagram showing the states of the eject lever, the rack teeth, and the main switch lever before ejecting, and FIG. 32 is a timing chart of the ejecting operation. 2... Main switch, 3... Main motor,
6...Cassette tape, 18...Slider, 25
...Insertion/removal lever, 29...Eject lever, 4
3,44...Flywheel, 47,48...Reel gear, 49...Idle gear, 50...Head base, 57...Magnetic head, 59...Pinch roller, 60...Pinch roller arm, 61...
Capstan, 63... Flywheel large diameter gear, 65... Pinch lever, 67... Roller support shaft, 70... Head retraction lever, 76... Retraction cam end face, 78... Lock recess, 79... Lock groove, 80...Idle gear drive cam groove, 80a...
...First cam groove part, 80b... Second cam groove part, 80
c...Second cam groove, 83...Swing lever,
87...RF gear, 88...Small diameter gear, 90...
RF lock lever, 94...Lock pin, 96...
...Connection lever, 97...RF lock solenoid,
98...First drive lever, 101...Second drive lever, 106...First shifting member, 107...
Second gathering member, 111... stopper pin,
112...Small protrusion, 113...Tension spring, 140
...Cam surface, 104a...Performance position cam surface, 10
4b... Sense position cam surface, 104c... Inclined cam surface, 141... Eject solenoid, 143
...Switch lever, 146...Leaf switch, 149...Eject gear, 151...Trigger lever.

Claims (1)

[Claims for Utility Model Registration] A running direction switching lever that switches the running direction of the magnetic tape, a head retraction lever that moves the magnetic head forward and backward, and a magnetic head that can be mounted and moved between a play position and a non-play position. a head base guided by the head base; a pair of pinch roller mechanisms in which a pinch roller is provided on a pinch roller arm and moves the pinch roller toward the capstan; The pinch roller mechanisms are arranged one on top of the other, a regulating member is provided on the pinch roller mechanism to regulate movement of the pinch roller toward the capstan, and a groove into which the regulating member is inserted is provided between the traveling direction switching lever and the traveling direction switching lever. A groove provided in each of the head retraction levers and provided in the running direction switching lever allows the one pinch roller to move toward one capstan and prevents the other pinch roller from moving toward the other capstan. The groove provided in the head retraction lever also controls the pinch roller on the side that is allowed to move toward the capstan by the running direction switching lever during recording point detection mode and fast forward mode. A cassette-type tape recorder characterized in that it is set so that it cannot be moved to a position where it comes into contact with a capstan.