JPH0560176B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a cassette tape player, and particularly to a cassette tape player that is effective when used in a place susceptible to vibrations, such as in a vehicle.

BACKGROUND ART Conventionally, in cassette tape players and the like, a gear is driven to rotate, and a cam portion provided on the gear drives a lever to move the head stand on which the magnetic head is placed forward and backward. are being carried out. In such a configuration, it is necessary to stop the motor that rotates the gear when the cassette is ejected, and for this reason, a leaf switch is provided and the motor is driven and stopped by turning on or cutting off the leaf switch. Therefore,
It is convenient in terms of the structure that a part of the mechanism for moving the head stand forward and backward can be used to turn on and off the leaf switch. At this time, if the protrusion provided on the gear is used to conduct the conduction or cutoff operation of the leaf switch, if the gear rotates in the opposite direction, the leaf switch will repeat the conduction or cutoff operation again. It is desired to prevent rotation in the opposite direction and prevent the leaf switch from turning on or off again.

Purpose An object of the present invention is to solve the above-mentioned problems, and to operate a switch that stops the motor by using a part of the mechanism that moves the head table forward and backward.
It is an object of the present invention to provide a cassette tape player that can prevent repetition of conduction or disconnection operations of a switch.

The present invention comprises: a head stand on which a magnetic head is placed and biased in a direction approaching the magnetic tape; The end portion has a swing lever to which a bias force is applied so that the one end part separates the head stand from the magnetic tape, and a cam on the top surface that presses the swing lever against the bias force. , and a partially toothed gear having a protrusion on the lower surface, and when the partially toothed gear is rotationally driven by the driving force of the motor and the cam presses the other end surface of the swing lever, the head stand moves forward. The cassette tape player is configured such that the magnetic head is in pressure contact with the magnetic tape, the magnetic head being disposed in a tangential direction to the rotation locus of the protrusion of the partially toothed gear, and always biased upwardly toward the partially toothed gear. A leaf spring and a switch that is turned off by a protrusion of the partially toothed gear to stop the rotation of the motor are provided, and the plate spring has an engagement on an upper surface that engages when the protrusion of the partially toothed gear rotates in the opposite direction. It has a mating protrusion and a bent part bent downward at the end, and when the switch is turned off and the rotation of the motor is stopped by the protrusion of the partially toothed gear, the engagement with the protrusion of the partially toothed gear is made. A cassette tape player characterized in that rotation of the partially toothed gear is prevented by engagement with a protrusion and a bias force of the swing lever.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.
1 is a simplified plan view of a cassette tape recorder and/or player in which the present invention is implemented, FIG. 2 is a front view as seen from the arrow A side in FIG. 1, and FIG. is a side view seen from the arrow B side in FIG. 1, FIG. 4 is a side view seen from the arrow C side in FIG. 1, FIG. 5 is a bottom view, and FIG. 7 is a rear view seen from the arrow D side in FIG.
The figure is a plan view showing the internal structure of FIG. 1 in a simplified manner.

A cassette support member 3 is provided upright on the left side of the board 1 in FIG. A pressing means 5 for turning on the switch 4 is provided near the tip of the support member 3 (the left end in FIG. 3). When the cassette is inserted into the cassette storage part 2, the cassette storage part 2 is lowered toward the board 1, and the switch 4 is pressed by the pressing means 5.
The state is turned on, thereby energizing the motor 10. When the motor 10 is energized, the partially toothed gear 34 is rotated clockwise via the pulley 12, gear 28, etc., which will be described later, and in this connection, the head stand 85 is rotated.
moves to the left in FIG. 1, thereby loading the cassette into position and starting playing or recording.

A motor 10 is provided on the board 1 . The output shaft of this motor 10 has a pulley 12 as shown in FIG.
is fixed. Pulley 12 and flywheel 1
An endless belt 16 is passed around the flywheel 4, and the flywheel 14 is rotationally driven by the endless belt 16. The output shaft of the motor 10 has a pulley 1 coaxially with the pulley 12.
8 is fixed. pulley 18 and pulley 20,
An endless belt 24 is passed around 22. A gear 26 is coaxially provided on the pulley 20,
This gear 26 meshes with a gear 28, and the gear 28 meshes with a gear 30. A gear 32 is fixed to the rotating shaft of the gear 30. This gear 32 can mesh with a partially toothed gear 34 pivotally supported on the base plate 1. When the motor 10 is driven, the pulleys 12, 18,
20, 22, gears 26, 28, 30, 34, and flywheel 14 are constantly driven to rotate as shown by arrows.

A gear 36 is coaxially fixed to the pulley 22 at a position above the substrate 1. A roller 40 and a gear 42 are provided on a winding rotating shaft 38 that is fitted into one reel of the cassette. The rotational driving force of the pulley 22 and the gear 36 is generated by the rotation of the gear 4
4 and 42 to the roller 40 and rotating shaft 38.

A rotating shaft 46 of the gear 36 is fixed to a switching piece 48 for switching the running direction of the tape. Switching piece 4
8 is perpendicular to the rotating shaft 46 and extends in the left-right direction in FIG. A gear 52 is provided on the rewinding rotating shaft 50 which is inserted into the other reel of the cassette, and is brought into mesh with the gear 36 by the downward displacement of the switching piece 48 in FIG. In the playing or fast-forwarding state, gear 36 is separated from gear 52. In the rewinding state, the gear 36 meshes with the gear 52, so that the rotational driving force of the gear 36 is transmitted to the gear 52, thereby causing the rewinding rotation shaft 50 to move in the opposite direction to the winding rotation shaft 38. be rotated.

FIG. 8 is a perspective view of the vicinity of the tip of the support member 3, FIG. 9 is a partially enlarged perspective view of FIG. 8, and FIG.
FIG. 3 is a side view corresponding to the figure. An abutment member 60 is rotatably supported at the tip of the support member 3 by a shaft 61 . This abutting member 60 is composed of a substantially fan-shaped plate portion 62 and a protruding piece 63 continuous therewith. The abutment member 60 has a plate-shaped portion 62 disposed between the support member 3 and the cassette storage section 2, and a protruding piece 63 disposed on the inner side of the cassette storage section. Plate portion 62
A projection 64 is formed on the surface of the spring 65, and one end of a spring 65 is fixed to this projection 64. The other end of the spring 65 is fixed to the substrate 1. When the cassette is inserted into the cassette storage part 2, the protruding piece 63 is pressed by the cassette, so that the abutment member 60 is angularly displaced about the axis 61 against the spring force of the spring 65. At this time, the plate portion 62 is displaced along a cylindrical projection 66 provided on the side surface of the cassette storage portion. When the abutting member 60 is angularly displaced, the abutting piece 67 of the switch 4 presses the switch 4, resulting in a conductive state and energizing the motor 10.

11 is a perspective view of the vicinity of the upper part in FIG. 1, FIG. 12 is a perspective view seen from the arrow E side of FIG. 11, and FIG. 13 is a plan view of the partially toothed gear 34. , FIG. 14 is a side view seen from the arrow F side of FIG. 13. A toothless portion 7 is provided on the upper surface of the toothless gear 34.
A first cam 71 having a cylindrical shape is provided upright adjacent to one end of the partially toothed gear 70, and a second cam 72 having a shorter length than the cam 71 is provided adjacent to the other end of the partially toothed gear 70.
Protrusions 73 and 74 are provided on the lower surface of the partially toothed gear 34 at positions corresponding to the cams 71 and 72, respectively. The protrusion 73 has a generally U-shaped horizontal cross section, and its opening faces the support shaft 75 of the partially toothed gear 34 . The protrusion 74 has an arcuate horizontal cross section and is arranged along the circumferential direction around the support shaft 75.

An electromagnetic hook 76 is provided on the left side of the partially toothed gear 34 in FIG. The electromagnetic hook 76 has a coil 7
7 is housed in the coil 77, and when the switch 4 is turned on, this coil 77 is excited. A rotation prevention piece 78 for preventing rotation of the partially toothed gear 34 is provided at the lower end of the electromagnetic hook 76 . The rotation blocking piece 78 is configured to be able to move toward and away from the partially toothed gear 34, as will be described later. A swing bar 79 is provided above the electromagnetic hook 76 in FIG. As shown in FIG. 16, the swing lever 79 includes a U-shaped base 80 and arm parts 81 and 82 extending from both sides of the base 80. By the ejecting spring 83 fixed to the end of the arm part 82,
The swing lever 79 is biased to the right in FIG. The arm portion 82 of the swinging lever 79 is the partially toothed gear 3
4 and in contact with the first cam 71. When the partially toothed gear 34 is rotated clockwise, the swing lever 79 is displaced to the left in FIG. 12 via the first cam 71 against the spring force of the spring 83. The head stand 85 is moved by the displacement of the swing lever 79.
is displaced to the left in FIG. 1 and comes into contact with the tape, thus entering the playing or recording state.

FIG. 15 is a perspective view showing the structure related to the head stand 85, and FIG. 16 is a simplified exploded perspective view of FIG. 15. The head stand 85 provided on the substrate 1 includes a plate-shaped body 86 and an engagement piece 87 extending in a direction perpendicular to the plate-shaped body 86. Engagement piece 87
The locking portion 87a bent in an L-shape is connected to the swing lever 7.
The free end portion of arm portion 81 of No. 9 is in contact with the free end portion of arm portion 81 of No. 9. Therefore, the head stand 85, which is always biased downward in FIG. 15 by a spring (not shown),
downward displacement is prevented by. A head 88 is fixed onto the head stand 85 with pins or the like.

A pinch roller 89 is rotatably supported on the left side of the head stand 85 by a support member 90.
This pinch roller 89 can press against and separate from the capstan 92. The upright portion 90a of the support member 90 is provided with an L-shaped locking piece 90b that extends horizontally, and a cylindrical projection 90d is provided on the flat plate portion 90c that extends horizontally from above the upright portion 90a. is installed protrudingly. Support member 90
A hook-shaped engaging portion 93 is formed at one end of the flat plate portion 90e extending horizontally from below the standing portion 90a, and this engaging portion 93 is connected to a protrusion 94 that is erected on the head stand 85. can be engaged with.

The base 80 of the swing lever 79 is an upright portion 80a.
, flat plate parts 80b and 80c extending horizontally from both ends of the upright part, and an L-shaped locking part 97 provided at the lower part of the upright part 80a.

These swing levers 79 and support members 90
are the insertion hole 150 of the swing lever 79 and the support member 9
The insertion hole 152 formed in the flat plate part 90e of 0
It is rotatably supported around the axis of the pin 91 by the pin 91 which is inserted in sequence. Further, the left end of the head stand 85 is arranged on the right side of the pin 91. Both ends of the pin 91 are fixed to each substrate 1, 101. The locking piece 90b provided on the upright portion 90a of the support member 90 is connected to the upright portion 80a of the swing lever 79.
At the same time, one end of a torsion spring 96 attached to surround the outer periphery of the pin 91 is locked to a locking portion 97 of the swing lever 79 . The other end of the torsion spring 96 is connected to the flat plate portion 90c of the support member 90.
Fixed. Therefore, the support member 90 and the pinch roller 89 are biased clockwise, and the locking piece 90b is locked to the upright portion 80a of the swing lever 79, so that the support member 90 is rotated. Movement is blocked.

A fast forward/rewind mechanism 100 is provided above the head stand 85. Fast forward/rewind mechanism 10
0 is composed of a substrate 101, a quick-charring lever 102, a rewinding lever 103, a slide lever 104 movable in relation to the levers 102 and 103, and the like. A fast-forwarding lever 102 is mounted on the substrate 101 so as to be movable in the cassette insertion direction G. The fast forward lever 102 is biased by a spring 105 in a direction opposite to the cassette insertion direction G. A rewind lever 103 is placed on the fast forward lever 102. The rewind lever 103 is also movable in the cassette insertion direction G like the fast forward lever 102, and is biased in the opposite direction to the cassette insertion direction G by a spring 106. Rewind lever 10
3, the slide lever 104 is on the lever 103.
The lever 104 is placed so that a protrusion 107 provided therein is inserted into a long hole 108 formed in the lever 104. Further, a protrusion 110 of the substrate 101 is inserted into a long hole 109 formed at the left end of the slide lever 104. A spring support member 300 is attached to the base plate 101 surrounding the fast forward lever 102 and the rewind lever 103, and the levers 102 and 103 have a gap from the support member 300 and can freely move forward and backward. Fast forward lever 10
2 is formed with an elongated hole 111 extending in the longitudinal direction of the substrate 1, and the rewind lever 103 is also formed with a similar elongated hole 112 so as to match the elongated hole 111. Pins 113 erected on the substrate 101 are fitted into the long holes 111 and 112. The slide lever 104 is biased in a direction opposite to the insertion direction G by a spring 114.

When the rewinding lever 103 is pushed in, the slide lever 104 moves the pin 10 inserted into the elongated hole 108.
7 and moves along the cassette insertion direction G. When the fast-forwarding lever 102 is pushed in, the engaging piece 114 erected at the tip of the fast-forwarding lever comes into contact with the engaging portion 115 of the slide lever 104, so that as the fast-forwarding lever 102 moves, the slide lever 104 also move in the same direction.

To the left of the levers 102 and 103, there is a lever 10.
When 2,103 is pushed in, the lever 10
A trigger lever 115 is provided to keep the trigger lever 2,103 locked. This trigger lever 115
consists of an upper lever 116 and a lower lever 118.
The upper lever 116 includes an arm 116a extending toward the fast-forward lever 102, and an arm 116b extending in the opposite direction to the arm 116a. Upper lever 1
A lower lever 118 provided directly below the arm 116 has substantially the same shape as the arm 116a. Upper lever 11
6 and the lower lever 118 are inserted into the insertion holes 119 and 12.
It is rotatably supported around the axis of the bottle 122 by a pin 122 inserted through the pins 0 and 121. As shown in FIG. 12, when the partially toothed gear 34 is rotated clockwise and the second cam 72 is rotated to push up the end of the trigger lever 115, the trigger lever 115 is centered around the pin 122. is rotated clockwise.

Figure 17 shows the head stand 85 and the fast forward lever 1.
02 is a simplified plan view showing the structure related to the rewind lever 103, and FIGS. 18 to 20 are diagrams for explaining the operating states of the vertical movement of the pinch roller 89 and the head stand 85. Before inserting the cassette, the head stand 85 is attached to the engaging piece 87.
The end of the arm 81 of the swing lever 79 (the right end in FIG. 17) is in contact with the locking part 87a of the swing lever 79, and the swing lever 79 is biased counterclockwise by the ejecting spring 83. ing. Therefore, the head stand 85, which is biased downward in FIG. 17 by a not-shown spring, is prevented from moving downward.

When the cassette is inserted, the partially toothed gear 34 is rotated clockwise as described above, and the swing lever 79 is rotated clockwise.
oscillates clockwise around pin 91. When the arm portion 81 swings due to the swing lever 79, the end of the arm portion 81 and the locking portion 87 of the head stand 85
The locked state of a is released, and as the arm portion 81 is displaced, the head stand 85 is also displaced downward in FIG. 17. At this time, the upright portion 80 of the swing lever 79
a rotates clockwise, so that the torsion spring 96
The support member 90 and the pinch roller 89 are also rotated clockwise by the spring force. In this way, when the end of the arm 82 of the swing lever 79 reaches its maximum limit, the pinch roller 89 moves to the capstan 9.
2 is crimped. When the pinch roller 89 is pressed against the capstan 92 via the tape, the tape is driven at a constant speed. During tape play, the contact portion of the tape that comes into contact with the pinch roller 89 and the head 88 always projects slightly downward. Accurate reproduction is achieved by sufficiently pressing the tape against the pinch roller 89 and the head 88 in this way.

During fast forwarding, the fast forwarding lever 102 is pushed to the left in FIG. The head is retracted to a predetermined position with a small insertion amount. To explain in more detail, on the side of the bent portion 160 at the tip (left end in FIG. 19) of the fast-forwarding lever 102, there is a slope that slopes diagonally upward to the right in FIG. 19 from the tip toward the rear. A surface is formed, and the fast forward lever 102
When the support member 9 is pushed to the left in FIG.
A protrusion 90d provided on the pin 90 is guided in contact with the inclined surface, and as the lever 102 is displaced, the protrusion 90d and therefore the pinch roller 89 are rotated clockwise about the pin 91. When the pinch roller 89 is rotated, the head stand 85 is retracted upward via a protrusion 94 erected on the head stand 85 which is engaged with the engaging portion 93 of the support member 90. . In this way, the pinch roller 89 is sufficiently separated from the capstan 92, and the head stand 85 is moved to a predetermined position where the head 88 is inserted into the tape by a relatively small amount. When rewinding, push the rewind lever 103,
The same operation as in the above-described rapid forwarding is performed, and the pinch roller 89 and the head stand 85 are also moved in the same manner.

When the cassette is ejected, when the swinging lever 79 is swung counterclockwise by the spring force of the ejecting spring 83 as shown in FIG. The stop portion 87a is pushed upward, so that the head stand 85 is retreated upward. At the same time, the support member 90 and therefore the pinch roller 89 are rotated counterclockwise about the pin 91 by the spring force of the spring 96. In this way, the pinch roller 89 is connected to the capstan 92.
and the head 88 separates from the tape. Therefore, the cassette can be ejected without any problem.

In this way, when fast forwarding or rewinding, the pinch roller 89 is operated with the head 88 inserted into the tape.
Since the head 88 and the pinch roller 89 are moved back when ejecting, it is possible to locate the beginning of a song during fast forwarding or rewinding.

FIG. 21 is a simplified plan view of the vicinity of the tip of the fast-forward lever 102, FIG. 22 is a front view of the trigger lever 115, and FIG. 23 is a simplified plan view of the trigger lever 115 when the fast-forward lever 102 is pushed in.
5 is a diagram for explaining the operating state of No. 5. FIG. The fast-forwarding lever 102 is provided with an engaging portion 160 at its tip end that engages with one end of the trigger lever 115.
A guide surface 166 extending in the left-right direction in FIG. 1), a guide surface 167 extending diagonally downward to the right in FIG. 168 and a recess 169 continuous to the guide surface 168 are formed. There is a long hole 1 above the guide surface 166 of the fast-forwarding lever 102.
11 is formed, into which a protrusion 113 on the substrate 1 is fitted. Engagement portion 16 of fast-forward lever 102
0, the upper lever 116 and lower lever 118 of the trigger lever 115 are engaged, and the upper lever 11
The contact surface 116a of No. 6 is in contact with a swinging piece 165a of a muting leaf switch 165 disposed below the trigger lever 115. This muting leaf switch 165 is a so-called muting switch that eliminates unpleasant noises caused by contact between the tape and the head during fast forwarding or rewinding.
and a fixing piece 165b.

When the fast forward lever 102 is pushed in, the 23rd
As shown in FIG.
67, the swinging piece 165a comes into contact with the fixed piece 165b, and the leaf switch 165 becomes conductive.

When the fast-forward lever 102 is pushed further from the state shown in FIG. 23, the upper lever 116 is guided by the guide surface 168 and fitted into the recess 169, as shown in FIG. 23, and the fast-forward lever 102 is locked. state. At this time, the lower lever 118 stops on the guide surface 168. Guide surface 168 is guide surface 1
Since it is located below 66, lower lever 1
18 is in contact with the guide surface 168, the lower lever 118 has moved lower than before the fast-forwarding lever 102 was inserted, so the lower lever 118 pushes down the swinging piece 165a and moves the fixed piece
5b, thereby causing leaf switch 1
65 is maintained in a conductive state.

In this way, the muting leaf switch 165 can be made conductive during fast forwarding or rewinding, thereby eliminating unpleasant noises caused by contact between the head and the tape when searching for the beginning of a song.

FIG. 24 is a simplified plan view showing the configuration related to the slide lever 104, partially toothed gear 34, and trigger lever 115 when playing a tape, and FIG.
26 is a plan view corresponding to the figure, and FIG. 26 is an enlarged plan view of a part of FIG. 24. As described above, the rotational driving force from the motor 10 rotates the partially toothed gear 34 clockwise via the pulley 12 and the gear groups 20, 28, 30, and 31. Missing tooth gear 34
When the gear 31 meshes with the gear 31 and rotates to the position of the toothless portion 70, the rotation prevention piece 78 of the electromagnetic hook 76 engages with the protrusion 74 provided on the lower surface of the toothless gear 34, and the toothless gear 34 is rotated. After the rotation stops, the end of the toothless portion 70 and the gear 31 are idle. Tape performance is performed in this state. When the fast forwarding lever 102 is pushed in, the slide lever 104 moves upward in FIG. 25 as shown in FIG. 25. Further, as described above, the trigger lever 115 is locked with the fast-forward lever 102, and the pinch roller 89 is separated from the capstan 92. When a fast-forward operation is performed in such a state, when the head 88 detects an interval between tracks on the tape, the coil 77 is instantaneously demagnetized. When the coil 77 is demagnetized, the electromagnetic hook 76 operates, and the engagement between the rotation prevention piece 78 and the protrusion 74 is released, allowing the partially toothed gear 34 to rotate clockwise. As the partially toothed gear 34 rotates, the swinging lever 79 starts to swing counterclockwise due to the spring force of the ejecting spring 83. After the swing lever 79 is slightly displaced, it comes into contact with the tip of the slide lever 104, and the swing movement of the swing lever 79 is blocked. This prevents the tape from ejecting.

In this state, as shown in FIG. 26, when the partially toothed gear 34 further rotates, the cam 72
displaces the trigger lever 115 to the right. By displacing this trigger lever 115,
The locked state with the fast forward lever 102 is released,
The fast forward lever 102 returns to its original state. At the same time, the pinch roller 89 is also pressed against the capstan via the tape, and the playing state is restored. At this time, the partially toothed gear 34 is again prevented from rotating by the rotation preventing piece 78.

In this way, by slightly angularly displacing the cam 72 after detecting the song interval, the performance state can be restored, so that even if the song interval is short, it is prevented from occurring at the beginning or end of the song.

FIG. 27 is a perspective view of the electromagnetic hook 76, and FIG. 28 is a rear view of the electromagnetic hook 76 as seen from the H side in FIG.
29 is a bottom view seen from the I side of FIG. 27, and FIG. 30 is an exploded perspective view of FIG. 27. Referring to these drawings, the electromagnetic hook 76 is connected to the pin 19.
1,192 to the substrate 1. The electromagnetic hook 76 includes a coil 77, a holding member 200 that holds the coil 77, and an armature 201 that is attached to the holding member 200 in close proximity to the end of the coil 77. The holding member 200 includes a bottom plate portion 202 and side plate portions 203 , 204 , and 205 that extend perpendicularly to the bottom plate portion 202 . The side plate portion 203 and the side plate portion 205 are parallel, and the side plate portion 204 is perpendicular to the side plate portions 203 and 205.
A protrusion 206 that protrudes along the longitudinal direction is formed at the end of the side plate 205.
06 has an insertion hole 208 through which the bar spring 207 is inserted.
is provided.

The armature 201 has an L-shaped horizontal cross section and includes a base plate 209 facing the side plate 204 of the holding member 200 and a free end 210 extending perpendicularly from the base plate 209. Substrate part 209
A step portion 209a is formed in the step portion 209a, and an insertion hole 211 through which the protrusion portion 206 of the holding member 200 is inserted is provided in the step portion 209a. After the protrusion 206 is inserted into the insertion hole 211, the rod-shaped spring 207 is inserted into the insertion hole 208 and fixed, so that the armature 201 can freely swing in the direction of arrow J around the protrusion 206. be.

The lower end of the free end portion 210 is provided with a locking piece 212 bent inward and a rotation blocking piece 78 bent outward in order from the front to the rear in FIG. It is being One end of the spring 213 is connected to the locking piece 212, and the other end is connected to the locking piece 214 of the bottom plate portion 202.

When the coil 77 is excited, the base plate 209 of the armature 201 comes into contact with the end 77a of the coil 77, so that the armature 201 is swung clockwise against the spring force of the spring 213. When the coil 77 is demagnetized, the spring force of the spring 213 causes the armature 201 to swing counterclockwise.

FIG. 31 is a simplified plan view showing the configuration related to the partially toothed gear 34, FIG. 32 is an enlarged plan view of a part of FIG. 31, and FIG.
It is a sectional view seen from section line KK of a figure. A leaf spring 230 is disposed below the partially toothed gear 34. Also, below the partially toothed gear 34 and the leaf spring 23
A switch 231 for stopping the rotational drive of the motor 10 is disposed diagonally above and to the right in FIG. When the player is ejected from the playing state, the coil 77 is demagnetized, so that the armature 201 and therefore the rotation blocking piece 78 are displaced in a direction away from the partially toothed gear 34, allowing the partially toothed gear 34 to rotate. According to the rotation of the partially toothed gear 34, the swing lever 79
is swung once in the counterclockwise direction, and then the partially toothed gear 3
4, the swing lever 79 is wound up again. The protrusion 7 provided on the lower surface of the partially toothed gear 34
3 is provided on the leaf spring 230.
32, the tip of this protrusion 73 comes into contact with the swinging piece 231a of the leaf switch 231, so that the swinging piece 231a and the fixed piece 231b are separated, and the rotation of the motor 10 is stopped. This state is the state before the cassette is inserted.

When the rotation of the motor 10 is stopped, the partially toothed gear 3
4 stops, and the swing lever 79 is biased counterclockwise by the spring force of the ejecting spring 83. However, the locking protrusion 23
The protrusion 73 is in contact with the gear 2, thus preventing the partially toothed gear 34 from rotating in the opposite direction.

FIG. 34 is a perspective view of the leaf spring 230, and the third
FIG. 5 is a front view of the leaf spring 230, and FIG. 36 is a right side view thereof. The leaf spring 230 has a flat plate portion 2
30a, a vertical portion 230b extending below the flat plate portion 230a, and a base portion 230c extending horizontally from the vertical portion 230b. A locking protrusion 232 is provided on the flat plate portion 230a. Approximately triangular bent portions 230d and 230e are provided at the right end of the flat plate portion 230a.
is formed. Since the leaf spring 230 is disposed along the tangential direction of the circular locus of the protrusion 73, the bent portions 230d, 23 are formed at the right end of the flat plate portion 230a.
0e, the protrusion 73 and the flat plate portion 2
Contact with the right end of 30a is prevented.
Note that the flat plate portion 230a is biased upward, so that when the protrusion 73 exceeds the locking protrusion 232 and then starts reverse rotation, the protrusion 73 and the locking protrusion 232 are surely engaged, and no breakage occurs. gear gear 34
Reverse rotation is prevented.

Effects As described above, according to the present invention, a protrusion is provided on a partially toothed gear having a cam that moves the head table forward and backward,
Since the switch is shut off by this protrusion, a part of the mechanism for advancing and retracting the head stand can be used for operating the switch, simplifying the configuration and making it easier to set the switch shutoff timing. In addition, when the motor stops rotating, the engagement between the protrusion of the partially toothed gear and the engagement protrusion and the bias force of the swing lever prevent the partially toothed gear from rotating. It is possible to prevent repeated conduction or cutoff operations.

[Brief explanation of the drawing]

FIG. 1 is a simplified plan view of a cassette tape recorder and/or player in which the present invention is implemented, FIG. 2 is a front view seen from the arrow A side in FIG. 1, and FIG. A side view seen from the arrow B side of
Figure 4 is a side view seen from the arrow C side in Figure 1;
The figure is a bottom view, FIG. 6 is a rear view seen from the arrow D side in FIG. 1, FIG. 7 is a simplified plan view showing the internal structure of FIG. 1, and FIG. 9 is an enlarged perspective view of a part of FIG. 8, FIG. 10 is a side view corresponding to FIG. 3 with the cassette inserted, and FIG. 11 is a perspective view of FIG. A perspective view of the vicinity of the upper part, FIG. 12 is a perspective view seen from the arrow E side in FIG. 11, FIG. 13 is a plan view of the partially toothed gear 34, and FIG. 15 is a perspective view showing the structure related to the head stand 85, FIG. 16 is an exploded perspective view of FIG. 15, and FIG. 17 shows the head stand 85 and the lever 10.
18 to 20 are diagrams for explaining the operating states of the pinch roller 89 and the head stand 85,
Figure 21 shows the fast-forward lever 102 and trigger lever 1.
a simplified plan view showing the configuration related to 15;
22 is a front view of the trigger lever 115,
1 and 2 are diagrams for explaining the operating state of the trigger lever 115 when the fast-forward lever 102 is pushed in, and FIG. 24 is a diagram showing the slide lever 104, partially toothed gear, and trigger lever 115 during tape playback.
Simplified plan view showing the configuration related to the 25th
The figure is a plan view corresponding to FIG. 24 at the time of fast forwarding or rewinding, FIG. 26 is an enlarged plan view of a part of FIG. 24, FIG. 27 is a perspective view of the electromagnetic hook 76, and FIG. 28 is a plan view corresponding to FIG. 27 is a rear view as seen from the H side, FIG. 29 is a bottom view as seen from the I side in FIG. 27, FIG. 30 is an exploded perspective view of FIG. 27, and FIG. 31 is related to the partially toothed gear 34. FIG. 32 is a partially enlarged plan view of FIG. 31, FIG. 33 is a sectional view taken along the section line K--K in FIG. 32, and FIG. 34 is a simplified plan view showing the configuration. A perspective view of a leaf spring 230,
FIG. 35 is a front view of the leaf spring 230, and FIG. 36 is a right side view thereof. 34... Partial gear, 73, 74... Protrusion, 230...
Leaf springs, 230d, 230e...bending portions, 232...
Engagement protrusion.

Claims (1)

[Scope of Claims] 1. A head stand on which a magnetic head is placed and biased in a direction approaching the magnetic tape; and a head stand that is rotatable about an axis and has one end engaged with a part of the head stand. At the other end thereof, a swinging lever is provided with a bias force so that the head stand is separated from the magnetic tape, and a cam is provided on the top surface of the swinging lever for pressing the swinging lever against the bias force. and a partially toothed gear having a protrusion on the lower surface, the partially toothed gear is rotationally driven by the driving force of the motor, and the cam presses the other end surface of the swing lever, thereby causing the head to move. The cassette tape player is configured such that the base moves forward and the magnetic head comes into pressure contact with the magnetic tape, and the player is arranged in a tangential direction to the rotation locus of the protrusion of the partially toothed gear, and is always biased upwardly toward the partially toothed gear. and a switch that is turned off by the protrusion of the partially toothed gear to stop the rotation of the motor, and the plate spring is provided on an upper surface of the switch that engages when the protrusion of the partially toothed gear rotates in the opposite direction. and a bent portion bent downward at the end thereof, and when the switch is turned off and the rotation of the motor is stopped by the protrusion of the partially toothed gear, the protrusion of the partially toothed gear and the bent portion are bent downward. A cassette tape player characterized in that rotation of the partly toothed gear is prevented by engagement with an engaging protrusion and a bias force of the swing lever.