JPS6120704Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder in which a head board is rotatably attached to a cassette holder.

In this type of cassette tape recorder, after a cassette is inserted into a cassette holder, the cassette holder is rotated to mount the cassette at a cassette mounting position on a mechanical board. Thereafter, the head board is rotated so that the head mounted on the head board is deeply inserted into the front opening of the cassette and brought into contact with the tape in a predetermined state.

However, at this time, the height of the cassette is accurately regulated on the mechanical board, but the head board, which is rotatably attached to the cassette holder, always has some wobbling at its pivot point, so the height of the head cannot be adjusted. tends to go awry. If the height of the head relative to the cassette (tape) deviates when the cassette is installed, a tracking error will occur during playback, and this tracking error will be particularly noticeable in a stereo player.

The present invention has been devised in consideration of the above-mentioned circumstances, and aims to provide a cassette tape recorder which has a head base rotatably attached to a cassette holder, yet which can always accurately regulate the height of the head relative to the cassette (tape) when a cassette is inserted, thereby preventing tracking errors during playback, and which has a very simple structure with a small number of parts and assembly labor.

An embodiment of the present invention will be described below with reference to the drawings.
This cassette tape recorder is an ordinary compact cassette (hereinafter simply referred to as cassette)7.
This is a playback-only stereo device that uses 1.

First, the overall structure of a cassette tape recorder will be explained with reference to FIGS. 1 to 4.

First, as shown in FIGS. 1 and 2, the outer diameters of the cabinet 73 and cassette lid 74 of the tape recorder main body 72 are extremely small (several mm) larger than the outer diameter of the cassette 71. It is constructed with compact dimensions. One side 73a of the cabinet 73 is open over almost the entire surface, and the cassette 71 is horizontally mounted on the side 73a. Further, the cassette lid 74 is configured to cover the entire surface of the side surface 73a from the top of the cassette 71. The cassette holder 75 also has a cassette lid 7.
4, the cassette 71 is inserted into this cassette holder 75, and the cassette lid 7
It is configured so that it can be attached to the side surface 73a by closing the lid of No. 4. A top plate 76a of a plastic molded chassis (hereinafter simply referred to as chassis) 76 incorporated in the cabinet 73 is arranged horizontally on a side surface 73a, and a supply reel shaft 77, A take-up reel shaft 78, a capstan 79, a cassette positioning guide 80, etc. are arranged.

Next, as shown in FIG.
Four push buttons, a stop button 82, a play button 83, a fast forward button 84, and a rewind button 85, a volume adjustment knob 86, and the like are arranged on the other side surface 73b of the screen.
Note that the push buttons 82 to 85 and the knob 86 are arranged in recesses 87 and 88, respectively.

Next, as shown in FIG. 4, a mechanical board 90 made of a metal plate is fixed to the lower surface of the upper surface plate 76a of the chassis 76, and a tape drive device 91 is provided below the mechanical board 90.

Next, a battery insertion slot 93 is provided on the top plate 76a of the chassis 76 at a position that is biased towards the front surface 73c of the cabinet 73, and a battery storage section 94 is integrally provided in the chassis 76 below the battery insertion slot 93. ing. Note that a battery cover 95 is detachably attached to the battery insertion port 93.

Next, the cassette mounting device 97 will be explained with reference to FIGS. 5 to 9B.

First, as shown in FIG. 5, the cabinet 73 and the cassette lid 74 are made of plastic, for example, and the cassette holder 75 is made of sheet metal, for example. The cassette holder 75 has a pair of cassette holding parts 99a facing each other in a substantially U-shape on the lower side of both left and right ends of a holder main body 98 having a substantially U-shape.
99b is integrally provided. A stereo playback head 100 is located at the bottom of the holder body 98.
A pinch roller 101, a tape guide 102, etc. are attached.

Next, at the upper part of the upper surface plate 76a of the chassis 76, a pair of support blocks 103 are installed at both left and right ends on the rear end side.
a and 103b are provided integrally. A pair of left and right fulcrum shafts 104a, 104b are press-fitted onto both side surfaces of both support blocks 103a, 103b so as to have the same axis. Note that both of these fulcrum shafts 104a, 104b are constituted by cylindrical shafts having female screw holes 105a, 105b provided in the inner periphery of the hollow portion. Then, the cassette holder 75 is attached to both side plate portions 1 of both cassette holding portions 99a and 99b.
Through holes 107a provided in 06a and 106b,
107b, it is inserted into both fulcrum shafts 104a, 104b and rotatably supported. In addition, left and right side walls 109 are integrally provided with the cassette lid 74.
Through holes 110a and 110b are provided in a and 109b, and these through holes 110a and 110b
The cassette lid 74 is rotatably supported by a pair of set screws 111a and 111b which also serve as fulcrum shafts and which are inserted through the fulcrum shafts 104a and 104b and screwed into female threaded holes 105a and 105b of both fulcrum shafts 104b. Therefore, the cassette lid 74 and the cassette holder 75 are each rotatably supported around the same axis. Note that a pair of protrusions 112a and 112b integrally provided at both left and right ends of the cassette holder 75 close the cassette lid 74.
These gaps 114 are provided in a pair of gaps 114a, 114b provided between a pair of protrusions 113a, 113b that are integrally provided inside the side walls 109a, 109b of the cassette lid 74, and an inner surface 74a of the cassette lid 74.
It is inserted with enough room to allow relative movement within a and 114b. Therefore, the cassette lid 74 is within a predetermined angle range θ with respect to the cassette holder 75.
₁ (see Fig. 9A). A click mechanism (not shown) using, for example, a styrene ball and a coil spring is used between the support block 103a on one side and the side plate 106a of the cassette holding section 99a on the other hand, so that the cassette holder 75 can be moved as shown in FIG. 9A. The cassette insertion position shown in FIG. 9C and the cassette mounting position shown in FIG. 9C are positioned by clicking, respectively. Also, the front wall 11 of the cabinet 73
A pair of left and right cassette presser springs 116a and 116b made of plate springs are attached to the inside of the upper end portion of the cassette 5.

Next, as shown in FIG.
A substantially L-shaped locking pawl 119 is integrally provided inside the front edge 118 of the locking device. On the other hand, the 6th
As shown in the figure, a locking mechanism 1 is provided at the upper end of the front wall 115 of the cabinet 73 for engaging the locking pawl 119 to lock the cassette lid 74.
20 are provided. A lock plate 121 is used in this lock mechanism 120, and this lock plate 12
1 is inserted between the front wall 115 of the cabinet 73 and the chassis 76 at its left and right sides and its lower three sides, and is attached so as to be slidable in the left and right direction. A lock claw 123 having a slope 122 on the upper surface of the tip is integrally provided at the upper end of this lock plate 121.
A knob portion 124 is integrally provided at the lower part of the holder. A compression spring 126 is housed in a recess 125 provided on the back surface of the lock plate 121, and the left end of the compression spring 126 in FIG.
6, and the right end in FIG.
It is pressed to 8. Therefore, this compression spring 126
As a result, the lock plate 121 is biased to slide rightward in FIG.

Next, as shown in FIGS. 5 and 7 to 9B, a pair of left and right leaf springs 130a and 130b are arranged between the cassette lid 74 and the cassette holder 75. As shown in FIG. 8, three spring acting portions are integrally provided at the tips of both leaf springs 130a and 130b in a substantially fork shape, of which a pair of left and right spring acting portions 13
1a is tilted upward, and the spring acting portion 131b at the center is tilted downward. Further, a through hole 133 is provided in the substantially central portion of the base portion 132, and a bent portion 134 bent substantially vertically downward is integrally provided between the base portion 132 and the tip. On the other hand, the holder body 98 of the cassette holder 75
A pair of elongated holes 135a and 135b are provided at both left and right ends of the
is provided. And both leaf springs 130a, 1
30b has both elongated holes 1 by these bent portions 134.
A pair of dowels 136a, 13 are punched into the upper surface of both left and right ends of the holder main body 98 while being engaged and positioned within the ends of the holder body 98.
6b, and both these dowels 136a, 1
The head of 36b is tightened and the cassette holder 75
is fixed to. Both leaf springs 130a, 130 fixed to the cassette holder 75 in this way
The spring acting part 131b in the center of b has both elongated holes 135.
a, 135b. In this case, both leaf springs 130a and 130b do not necessarily need to be fixed to the cassette holder 75 side, but may be fixed to the cassette lid 74 side.

Next, as shown in FIGS. 9A and 9B, the cassette 7
The installation procedure for step 1 will be explained.

First, FIG. 9A shows a state in which the cassette lid 74 is opened, and at this time the cassette holder 75 is click-positioned at an angle of inclination of approximately 45 degrees as shown. On the other hand, at this time, both leaf springs 130
The cassette lid 74 is pushed up by each pair of spring acting portions 131a, a and 130b, and the cassette lid 74
is rotated in the direction of arrow a with respect to the cassette holder 75 and is open at an angle θ ₁ with respect to the cassette holder 75. Note that both protrusions 113a and 113b are in contact with both protrusions 112a and 112b, and the cassette lid 7 is closed.
The above-mentioned opening angle θ ₁ of No. 4 is regulated. At this time, the spring acting portions 131b at the center of both the leaf springs 130a, 130b are formed by the elongated holes 135a, 135b.
It is located inside, that is, within the plate thickness of the holder body 98, and does not protrude downward from the holder body 98.

Next, with the lid open, insert the cassette 71 into the cassette holder 75 from the front opening 137 side diagonally downward, and insert both left and right ends of the cassette 71 into the cassette holding parts 99a and 99b. (See Figure 7). However, when the cassette is inserted using the lever, the cassette lid 74 is held against the cassette holder 7.
Since the cassette lid 74 is opened at an angle _.theta.1 relative to the cassette 5, the cassette lid 74 does not obstruct the insertion of the cassette at all, and the cassette can be inserted very easily. In addition, since the spring acting portions 131b at the center of each of the leaf springs 130a, 130b do not protrude below the holder main body 98, when inserting the cassette,
There is no possibility that the cassette 71 will be accidentally caught on these spring acting portions 131b, and the above-mentioned cassette insertion can be carried out extremely smoothly.

Next, after inserting the above cassette, open the cassette lid 74.
At this time, the inner surface 7 of the cassette lid 74 is rotated in the direction of arrow a' to install the cassette 71.
4a presses each pair of spring acting portions 131a of both leaf springs 130a and 130b, and the repulsive force of these spring acting portions 131a causes the cassette holder 7 to
5 is rotated in the direction of arrow a'. At this time, the spring acting portion 1 at the center of each of the leaf springs 130a, 130b
31b are both elongated holes 135a and 13 of the holder main body 98.
5b and is pressed against the upper surface of the cassette 71.

Next, as shown by the solid line in FIG. 9B, open the cassette lid 7.
When the cassette 4 is completely closed, the cassette 71 is inserted into the reel shafts 77, 78, the capstan 79, the cassette positioning guide 80, etc., and is mounted horizontally on the top plate 76a of the chassis 76. At this time, both cassette presser springs 116a and 116b press the rear end of the cassette 71, and the cassette 71 is pressed toward the cassette holder 75, thereby positioning it in the front-rear direction. Further, upon completion of this lid closing, the locking pawl 119 of the cassette lid 74 is locked by the locking mechanism 120. That is, just before the cassette lid 74 is closed, the locked pawl 119 touches the slope 1 of the locking pawl 123.
22, and by the guiding action of this slope 122, when the lock plate 121 is once slid to the left in FIG. 6 against the compression spring 126, it moves back to the right in FIG. The locking claw 123 is the locked claw 11
9 as shown in FIG. 6 to lock the cassette lid 74 in the fully closed position. and cassette lid 7
4 is locked, both leaf springs 130
The cassette holder 75 is pressed and fixed against the upper surface plate 76a of the chassis 76 by the repulsive force of each pair of spring acting portions 131a, 130b. Further, the cassette 71 is pressed and fixed onto the upper surface plate 76a of the chassis 76 by the spring acting portions 131b at the center of each of the leaf springs 130a, 130b.

The cassette loading operation is completed as described above, and when the playback button 83 is pressed later, the playback head 100 is deeply inserted into the cassette 71 and comes into contact with the tape, and the pinch roller 101 attaches the capstan via the tape. 79, and the desired stereo reproduction is performed.

Next, when removing the cassette 71 installed as described above, first put your fingertips on the knob 124 of the lock plate 121 and lightly push the lock plate 121 to the left in FIG. 6 against the compression spring 126. move. Then, the locking pawl 123 becomes the locked pawl 11.
9 and the cassette lid 74 is unlocked. At that moment, both leaf springs 130a,
Due to the repulsive force of each pair of spring acting portions 131a of 130b, the cassette lid 74 is hopped up to the position shown by the imaginary line in FIG. 9B, and the intention to open the cassette lid 74 is indicated to the user. By hop-up of the cassette lid 74, the tip of a finger can be easily hooked onto the front edge 118 of the cassette lid 74, and the cassette lid 74 can be rotated extremely easily to the open position shown in FIG. 9A. Note that when opening the cassette lid 74, both protrusions 113a, 1
Both protrusions 112a and 112b are hooked by 13b, and the cassette holder 75 is pulled up to the cassette insertion position shown in FIG. 9A and positioned again in a click manner. After this, the cassette 71 is pulled out diagonally upward from inside the cassette holder 75. At this time, as well as when inserting the cassette described above, the cassette 71 can be pulled out very easily.
And it can be done smoothly.

Next, the battery storage device 141 will be explained with reference to FIGS. 10 to 12.

This battery storage device 141 is composed of the above-mentioned battery insertion slot 93, battery storage section 94, and battery cover 95.
Cassette storage section 1 for the cassette 71 installed on top
42 and is provided at the bottom of the cassette storage section 142. In the battery storage section 94, two AA batteries 143, for example, are stored horizontally and in parallel. Both batteries 143 inserted into the battery storage section 94 are arranged along the center of the bottom of the battery storage section 94, and the battery receiver 1 is provided integrally with the chassis 76.
44, respectively. Both batteries 143 inserted into the battery storage section 94 are connected to the power supply circuit by having their respective poles crimped to a pair of terminal fittings 145a and 145b provided at both ends in the left and right direction inside the battery storage section 94. Connected. The battery cover 95 is made of plastic, for example, and has a pair of locking claws 146 at one end.
is integrally provided, and an elastic locking pawl 147 having elasticity and having a substantially U-shape, for example, is integrally provided at the other end.

After both batteries 143 are inserted into the battery compartment 94, the battery cover 95 is removably attached to the battery insertion opening 93 to close the battery insertion opening 93. At this time, one end of the battery lid 95 is closed. Both locking claws 14
6 into a pair of locking holes 148 provided in the chassis 76. In addition, the other end is connected to an elastic locking claw 14.
7 into the locking hole 149 provided in the upper surface plate 76a of the chassis 76 using elasticity, and is locked to one end 149a of the locking hole 149. As a result, the battery cover 95
is attached flush with the top plate 76a.

In this battery storage device 141, in order to make the height _h1 of the battery storage part 94 as thin as possible and to reduce the thickness of the entire cassette tape recorder, the inner surface of the battery cover 95 is designed to accommodate the batteries 143 to be stored. A wavy concave curved surface 150 commensurate with the outer diameter is formed, and the substantial thickness _h2 of the battery cover 95, which is related to the height _h1 , is extremely thin.

However, according to the battery storage device 141, since the battery storage section 94 is connected to the cassette storage section 142 and is provided at the lower part of the cassette storage section 142, the battery cover 95 is completely exposed to the outer surface of the cabinet 73. Not done. Therefore, even if the battery cover 95 is made sufficiently thin, no strength problems will occur. Furthermore, since the battery cover 95 is not exposed at all on the outer surface of the cabinet 73, it is very desirable in terms of design, and there is a great degree of freedom in design.

Next, the head mounting device 153, head azimuth adjustment device 154, and tape guide device 155 will be explained with reference to FIGS. 13 to 21.

First, as shown in FIGS. 13 and 14,
A fulcrum shaft 157 is fixed to the lower part of one end side of the holder body 98 of the cassette holder 75, and one end of a head board 158 is rotatably supported at the lower end of the fulcrum shaft 157. And the head board 15
The reproducing head 100 is attached via an azimuth adjustment device 154 to the upper part of the position biased toward the tip 158a. Further, a pinch roller lever 159 having a substantially U-shaped cross section is disposed between the holder body 98 and the head board 158 and between the fulcrum shaft 157 and the reproduction head 100. is the fulcrum shaft 157
It is rotatably supported on. The pinch roller 101 is rotatably supported at a position near the tip 159a of the pinch roller lever 159 via a support shaft 160. Further, the tape guide 102 is attached to the lower part of the other end of the holder main body 98 via a height adjustment device 161. That is, a pinch roller 101 is arranged on the downstream side in the tape running direction, and a tape guide 102 is arranged on the upstream side, sandwiching the reproducing head 100. Further, a blind plate 162 is attached between the reproduction head 100 and the tape guide 102 at the lower part of the holder body 98. Note that the head board 158 is connected to the fulcrum shaft 157.
A torsion spring 1 is inserted into the outer periphery of the holder body 98 and has both ends locked to the holder body 98 and the head board 158.
63 to rotate in the direction of arrow b in FIG. The head substrate 158 is located at its tip 1.
58a is brought into contact with a stopper portion 164 that is integrally provided at the bottom of the lower end of the blind plate 162, so that rotation in the direction of the arrow b is restricted. In addition, the lower end of the spindle 160 of the pinch roller 101 is attached to the head board 158.
It is inserted into a hole 165 provided in the.
Therefore, within the range of movement of the support shaft 160 in the hole 165, the pinch roller lever 159 is moved against the head board 1.
It is configured to be rotatable relative to 58. The pinch roller lever 159 has a tension spring 1 stretched between its tip 159a and a spring receiver 166 provided on the azimuth adjustment device 154.
67 to rotate in the direction of arrow c in FIG. 13 with respect to the head board 158.

Next, the head mounting device 153 will be explained with reference to FIGS. 15 and 16.

This head mounting device 153 is attached to the above-mentioned fulcrum shaft 1.
57, a head substrate 158, a torsion spring 163, etc., and the fulcrum shaft 157 has its upper end 157a fixed to the holder body 98 by, for example, caulking. Further, a sleeve 169 is fixed to the upper part of one end of the head substrate 158 by, for example, caulking with its lower end 169a. The sleeve 169 is inserted into the outer periphery of the fulcrum shaft 157 from below and rotatably supported, and is prevented from coming off downward by an E-ring 170 fitted to the lower end 157b of the fulcrum shaft 157. . In addition, the fulcrum shaft 1
57 and the sleeve 169, a pair of upper and lower pinch roller lever pivot parts 171a, 171b are formed in a cylindrical shape.
are provided integrally with each other, and a pair of upper and lower through holes 173a, 173b provided at one end of the upper and lower sides 172a, 172b of the pinch roller lever 159 connect these pinch roller lever pivot parts 171a, 1.
It is rotatably supported on 71b. A gap 174 is provided between the upper end 169b of the sleeve 169 and the upper pinch roller pivot portion 171a, and the sleeve 169 is configured to be movable vertically within the range of the gap 174 around the outer periphery of the fulcrum shaft 157. has been done. As a result, the head substrate 158, which is integral with the sleeve 169, is configured to be movable vertically within a height _h3 , as shown in FIG.

On the other hand, the torsion spring 163 has both upper and lower ends 163a,
The intermediate portion between the coil portions 163b is wound in a spiral shape to form a coil portion 163c. This torsion spring 163 is inserted by its coil portion 163c on the outer periphery of the sleeve 169 and between the upper and lower pinch roller lever pivot parts 171a and 171b, and the upper and lower ends 163a and 163b are connected to the holder main body 98 and the head board 158. A locking hole 17 provided in each
5a and 175b. Note that a cutout 176 for escape from the lower end 163b of the torsion spring 163 is provided in a part of the pinch roller lever 159. And the coil part 1 of the torsion spring 163
63c is attached as described above in a state in which it is twisted in a predetermined state in the helical direction and compressed in a predetermined state in the vertical direction. And the coil part 16
3c, the head substrate 158 is
is rotated in the direction of arrow b in FIG.
Further, the head substrate 158 is urged to move in the direction of arrow c in FIG. 15 by the compressive repulsive force. Note that as shown in FIG. 14, the mechanical board 90
At a position below the head board 158 on the top surface, there is a
A plurality of height regulating protrusions 177 are integrally provided to regulate the height of the head substrate 158.

According to the head mounting device 153 configured as described above, after the cassette 71 is inserted into the cassette holder 75 as described above, the rotation of the cassette holder 75 causes the cassette 71 to be horizontally placed on the top plate 76a of the chassis 76. When installed in the 14th
As shown in the figure, the head board 158 is elastically pressed onto the height regulating protrusion 177 on the mechanical board 90 against the compressive repulsive force of the coil portion 163c of the torsion spring 163. 158 height is accurately regulated. As a result, the height of the reproducing head 100 relative to the tape of the cassette 71 is accurately regulated.

That is, in a structure in which the head board 158 is rotatably supported on the fulcrum shaft 157, there is always some wobbling, even if only slightly, in the pivot portion of the head board 158, and this wobbling causes the height of the reproducing head 100 to be out of alignment. It turns out. Moreover, the playback head is 100
Since this is for stereo, this playback head 100
If there is even a slight deviation in the height, this will cause a tracking error.

However, according to this head mounting device 153,
Since the height of the head board 158 can be accurately regulated irrespective of any wobbling in the pivot portion of the head board 158, the tracking error described above does not occur at all. Note that when the playback button 83 is pressed with the cassette installed, the head board 158 is rotated in the direction of arrow b' in FIG. 13 against the torsional repulsive force of the torsion spring 163. The substrate 158 will be slid horizontally on the height regulating protrusion 177.

Next, the azimuth adjustment device 154 will be explained with reference to FIGS. 17 and 18.

First, the playback head 100 is mounted on the head mounting plate 17.
It is fixed to the upper part of the center part in the longitudinal direction of 9 by, for example, spot welding. One end 179a of the head mounting plate 179 is screwed to the upper part of the head board 158 with a set screw 180. Further, the other end 179a of the head mounting plate 179 is provided with a groove portion 181, and an azimuth adjustment screw 182 is inserted into the groove portion 181 from above and screwed into a female screw hole 183 provided in the head board 158. . One end 179a of the head mounting plate 179
A leaf spring 184 and a spacer 185 are interposed in the shape of a sandwich arch between the head board 158 and the head board 158, and are fastened together with the setscrews 180. The spring acting portion 18 of this leaf spring 184
4a is bent into a substantially V shape, and its tip 184
b is elastically pressed against the lower surface of the head mounting plate 179. Further, a V-shaped bent portion 184c of the spring acting portion 184a is inserted into a long hole 186 provided in the head substrate 158. Note that the free end of the leaf spring 184 is bent upward, and the end is formed in the spring receiver 166.

According to this azimuth adjustment device 154, by adjusting the movement of the azimuth adjustment screw 182 in the vertical direction as shown in FIG.
9 is adjusted to be vertically curved with its one end 179a as a fulcrum as shown in FIG. 17, thereby adjusting the azimuth of the reproducing head 100 relative to the tape.

By the way, in this azimuth adjustment device 154, if the elongated hole 186 is not provided in the head board 158 and the leaf spring 184 is to be moved up and down only within the gap 187 between the head board 158 and the head mounting plate 179, is the height of the gap 187 h ₄
must be sufficiently large. That is, if the height _h4 of this gap 187 is small, the head mounting plate 1
79 is bent downward, the leaf spring 184 receives stress exceeding its elastic limit for bending, and there is a risk that the elastic force (spring action force) of the leaf spring 184 may be lost. On the other hand, if the height _h4 of the gap 187 is increased, it will affect the thickness of the entire cassette tape recorder, making the entire cassette tape recorder thicker.

However, according to this azimuth adjusting device 154, since the spring acting portion 184a of the leaf spring 184 is moved up and down within the elongated hole 186 provided in the head substrate 158 during the above-mentioned azimuth adjustment, the spring acting portion 184a The vertical movement of the head board 158 is not restricted at all by the head board 158. Therefore, this spring acting portion 184a receives stress exceeding the elastic limit for deflection, and the spring acting portion 184a
There is no loss of the elastic force (spring force) of a, and it has a long life and is extremely reliable. Moreover, the height of the gap 187 between the head board 158 and the head mounting plate 179 is h ₄
can be made very small regardless of the vertical movement space of the spring acting portion 184a, so the overall thickness of this cassette tape recorder can be made thin.

Note that since the spring acting portion 184a of the leaf spring 184 is inserted into the elongated hole 186, this leaf spring 1
84 is prevented from rotating, therefore, only one set screw 180 is required for this leaf spring 184. Further, the height of the reproducing head 100 is adjusted by adjusting the thickness by replacing the spacer 185 or the like. A tape guide 188 is fixed to the downstream side of the playback head 100 in the tape running direction.

Next, the tape guide device 155 will be explained with reference to FIGS. 19 to 21.

First, the tape guide 102 has a substantially U-shape, is inserted into the front opening 137 of the cassette 71 and comes into contact with the tape, and is positioned upstream of the playback head 100 in the tape running direction.
This controls the height of the tape relative to the playback head.

Next, this tape guide 102 is the guide support 1
It is integrally provided on the front surface of 90. The guide support 190 and the blind plate 162 are integrally molded, for example, from plastic, and the two 162 and 190 are, for example, approximately U.
They are integrally connected to each other by a letter-shaped elastic connecting piece 191. Note that this elastic connecting piece 191 can freely bend and twist up and down, left and right, and front and back. The blind plate 162 is screwed to the lower surface of the holder main body 98 by a set screw 193 inserted from below into a screw insertion hole 192 provided on the back side of the blind plate 162. At this time, the dowel 194 integrally provided on the upper end surface 162a of the blind plate 162 is inserted into the positioning hole 195 provided in the holder body 98.
is engaged with and positioned in a predetermined state. By attaching the blind plate 162 as described above, the gap between the reproduction head 100 and the tape guide 102 is closed, thereby providing a so-called blind screen.

On the other hand, the shaft support 1 is provided on the back side of the guide support 190.
96 is integrally provided, and its shaft support portion 19
A cylindrical shaft 198 having a female threaded hole 197 formed in the inner periphery of the hollow portion is vertically fixed to the upper part of the cylinder 6 . A guide cylinder 200 is fixed to the lower surface of the holder main body 98, and the cylinder shaft 198 is attached to the guide cylinder 200.
A height adjustment screw 2 is inserted into the guide tube 200 from below so as to be vertically movable, and is inserted into the guide tube 200 from above.
01 is screwed into the female screw hole 197. Note that a compression spring 202 is inserted between the holder main body 98 and the shaft support portion 196 on the outer periphery of the guide cylinder 200 and the cylinder shaft 198. Also, the guide support 1
A guide protrusion 203 integrally provided on the upper end surface 190a of the holder body 90 is inserted into a guide hole 204 provided in the holder body 98 so as to be movable in the vertical direction, thereby guiding the vertical movement of the guide support 190.

The height adjustment device 161 includes a guide support 190, a cylinder shaft 198, a guide cylinder 200, a height adjustment screw 201, a compression spring 202, and a guide protrusion 20.
3. It is composed of a guide hole 204 and the like, and the height of the tape guide 102 is adjusted via the guide support 190 by adjusting the vertical movement of the cylinder shaft 198 using the height adjustment screw 201 and by working together with the compression spring 202. It is configured so that the image quality can be adjusted. Note that during this height adjustment, the elastic connecting piece 191 bends against its elasticity, and the blinding plate 162 is not affected in any way. A stopper portion 164 integrally provided on the blind plate 162 has a substantially L-shape, and its vertical surface 164a is connected to the tip 1 of the head board 158.
58a in FIG. 13, the rotation in the direction of arrow b, ie, the backward movement position, is regulated, and its horizontal surface 164b regulates the height, ie, the floating of the tip 158a of the head board 158.

By the way, as mentioned above, in this cassette tape recorder, the playback head 100 is attached to the head board 158 which is rotatably supported on the cassette holder 75, and after the cassette 71 is installed, the playback button 8 is pressed.
3 is pressed, the head board 158 is rotated in the direction of arrow b' in FIG.
00 is inserted deeply into the cassette 71 and is pressed against a tape pad provided in the cassette 71 with a predetermined pressing force via the tape.

However, at this time, the tape guide 1 disposed upstream of the playback head 100 in the tape running direction
02 at the tip of the head board 158, the rotation stroke of the tape guide 102 accompanying the rotation of the head board 158 would be too large, making it unsuitable for downsizing the cassette tape recorder. On the other hand, if the head board 158 is attached to the cassette holder 75 so that it can move back and forth in a straight line, and the tape guide 102 is attached to the tip of the attached head board 158, the above-mentioned inconvenience does not occur. Not only does the support mechanism for the cassette tape recorder 158 become extremely complicated, but the thickness of the support mechanism also increases, which in turn increases the thickness of the entire cassette tape recorder.

However, in this tape guide device 155, the head board 158 is rotatably attached to the cassette holder 75, while the tape guide 102 is separated from the head board 158 and attached to the cassette holder 75.
Since the tape guide 102 is attached to the cassette 71 and inserted into the cassette holder 75, the tape guide 102 is inserted into the cassette 71 and brought into contact with the tape, so that the above-mentioned inconvenience does not occur at all.

Note that the stopper portion 164 allows the head board 15 to be
A blind plate 162 that also serves as a regulating member for regulating the return position of No. 8 and floating, and a tape guide 1
The elastic connecting piece 191 connects the guide support 190 of 02.
Since these small parts 162 and 190 are integrally connected to each other by
There is no chance of things falling apart,
It is very convenient to handle during assembly and disassembly. Further, particularly during assembly, for example, when the guide support body 190 is attached to the holder main body 98, the blind plate 162 is supported by the elastic connecting piece 191,
Since it is held at the approximate mounting position on the holder main body 98, it is very convenient to assemble, as it can be easily screwed together with the set screw 193.

Next, the tape drive device 91 will be explained with reference to FIGS. 22 to 26B.

First, this tape drive device 91 is provided at the lower part of the mechanical board 90 on the opposite side to the cassette mounting position. and the supply reel shaft 7
7. The lower ends of the take-up reel shaft 78 and the capstan 79 each protrude below the mechanical board 90.

Next, as shown in FIGS. 23A and 23B, a motor 211 is attached to the lower part of the mechanical board 90. A motor pulley 213 fixed to the motor shaft 212 of the motor 211, a capstan pulley 214 that also serves as a flywheel fixed to the lower end of the capstan 79, and the above-mentioned capstan pulley 214 fixed to the lower end of the capstan 79 and rotatably supported on the lower part of the mechanical board 90. A belt 216 is wound around a guide pulley 215 which also serves as an anti-rolling flywheel for the Pushtan flywheel. Further, in the lower part of the mechanical board 90, a drive gear support shaft 217 is located approximately halfway between the supply reel shaft 77, the take-up reel shaft 78, and the capstan 79, and the drive gear support shaft 217 and the supply reel shaft Converter gear support shafts 218 are vertically mounted at intermediate positions between the converter gears 77 and the converter gears 77, respectively.

Next, as shown in FIGS. 22 to 24, the capstan pulley 21 is connected to the lower end of the capstan 79.
A capstan gear 220 made of a wide gear is fixed to the upper part of 4. Further, the drive gear support shaft 217 has first and second drive gears 221 and 2.
22 are rotatably mounted so as to be movable in the direction of the rotation axis, with a clutch mechanism 223 interposed therebetween.

The clutch mechanism 223 is composed of a magnetic clutch, and as shown in FIG. 24, the second drive gear 222 itself is composed of a magnetic material, and the magnetic material is connected to a magnetized magnet. It is configured. and first drive gear 221
There is a semi-rigid disc (hysteresis disc) on the bottom surface of the
A thin washer 225 made of plastic is interposed between the disc 224 and the second drive gear 222, so that both the discs 224 and 224 are fixed to each other.
The gap between 2 and 224 is kept to a minimum. Note that a disc 226 is closely attached to the lower surface of the second drive gear 222 to prevent leakage of magnetic flux. The second drive gear 222 is thus coupled to the first drive gear 221 by its own magnetic force, and the second drive gear 222 is thereby coupled to the first drive gear 221 by its own magnetic force.
22 are configured to be rotationally driven on the same axis, and during the rotation, the second drive gear 222 is configured to be able to stop rotating in accordance with the load applied thereto. Note that there is a washer 22 at the lower end of the drive gear support shaft 217 to prevent it from coming off.
7 is fitted. Also, the first drive gear 221
A third drive gear 226 for driving the auto-shutoff mechanism is integrally provided on the upper part of the auto-shutoff mechanism.

Next, a conversion gear 229 constituted by a wide gear is rotatably attached to the conversion gear support shaft 218 so as to be movable in the direction of the rotation axis. The wide gear 229 is urged to move downward by a compression spring 230, and a washer 231 for preventing slipping off is fitted to the lower end of the conversion gear support shaft 218. Further, a supply reel shaft gear 232 made of a wide gear is attached to the lower end of the supply reel shaft 77. Further, first and second take-up reel shaft gears 233 and 234 are attached to the lower end of the take-up reel shaft 78. At this time, the take-up reel shaft 78
The lower end of the hexagonal shaft 235 has a hexagonal cross section, and the second take-up reel shaft gear 234 is engaged with the outer periphery of the lower end of the hexagonal shaft 235 and fixed with a set screw 236. . The first take-up reel shaft gear 233 has a hexagonal shaft 237 formed through a hexagonal hole 237 having a hexagonal cross section through its center.
It is inserted into the outer periphery of 35 and is attached so as to be movable in the direction of the rotation axis. The second take-up reel shaft gear 234 is biased downward by a compression spring 238.

The first drive gear 221 is configured to be constantly meshed with the capstan gear 220 and moved in the direction of the rotation axis, and due to this movement, the first drive gear 221 is connected to the conversion gear 229 and the first winding gear. It is configured to selectively mesh with the reel shaft gear 233. Further, the conversion gear 229 is configured to be constantly meshed with the supply reel shaft gear 232 and moved in the direction of the rotation axis. Further, the second drive gear 222 is the second take-up reel shaft gear 2.
It is configured to be engaged with and disengaged from 34.

Next, as shown in FIGS. 22, 23A, 23B, 26A, and 26B, an operating plate support shaft 241 is vertically fixed to the lower part of the mechanical board 90. And the operation plate support shaft 24
A sleeve 242 is attached to 1 so as to be freely movable in the axial direction. Note that this sleeve 242 is urged to move downward by a compression spring 243.
Further, a washer 244 for preventing slippage is fitted to the lower end of the operation plate support shaft 241. A first operation plate 245 is fixed to the upper end of the sleeve 242 in a substantially horizontal manner, and the tip 245a of the first operation plate 245 passes through the upper part of the first drive gear 221 and connects to the drive gear support shaft. It has been extended to the 217th section. And the tip 2 of the first operation plate 245
The first drive gear 221 and the third drive gear 22 are connected to each other by the through hole 246 provided with 45a
8 is engaged with an annular groove 47 provided between the two. A second operating plate 248 is superimposed on a portion of the lower surface of the first operating plate 245, and the second operating plate 248 is attached to the sleeve 242 with some wobbling in the vertical direction. This second operation plate 248 is made of a leaf spring,
Its tip 248a extends to the conversion gear support shaft 218 portion. And the second operation panel 2
The through hole 2 is provided with a tip 248a of 48.
49 is engaged with the outer periphery of the lower end portion of the boss portion 250 that is integrally provided on the conversion gear 229.

Next, among the four push buttons 82 to 85, the fast forward button 84 and the rewind button 85 are pressed against the mechanical board 90 on one side of the first and second operation plates 245, 248.
A pair of cylindrical members 25 integrally provided at the bottom of the
1,252, respectively, so as to be movable vertically within a certain range. And these two push buttons 8
Operating arms 253 and 254 are integrally provided in horizontal form at 4 and 85, respectively, and each operating arm 25
The upper surface of the tip of 3,254 has protrusions 255 and 2, respectively.
56 are integrally provided. And fast forward button 8
The operation arm 253 of No. 4 is connected to the first and second operation plates 2.
Overlapping part 25 in which 45 and 248 are stacked one on top of the other
It extends below the 7th section. On the other hand, rewind button 85
The operating arm 254 extends below a portion of the first operating plate 245 at a position where the second operating plate 248 is cut out. The second operation plate 245 is provided with a small semicircular arc-shaped notch 258 for escape from the protrusion 256 of the operation arm 254 of the rewind button 85.

Next, the tape drive operation by this tape drive device 91 will be explained.

First, in FIG. 25A, the solid line state indicates a stopped state, and at this time, the first drive gear 221 is located at the lowest position of the vertical movement range, and the conversion gear 250 is also located at the lowest position of the vertical movement range. are doing. Note that a vertical gap g ₁ is maintained between the first drive gear 221 and the conversion gear 229. In this stopped state, the second drive gear 222 is meshed with the second take-up reel shaft 234. Further, in this stopped state, the fast forward button 84 and the rewind button 85 are moved back downward, as shown by phantom lines in FIGS. 26A and 26B, respectively.

Next, when the play button 83 is pressed in the above-mentioned stopped state,
As shown in FIG. 23A, the motor 211 is rotationally driven, and the capstan 79 is rotated through the belt 216.
is rotated in the direction of arrow d. Then, the first drive gear 221 is rotationally driven in the direction of arrow e by the capstan gear 220.
21 rotates a second drive gear 222 in the same direction via a clutch mechanism 223. Then, the take-up reel shaft 78 is rotationally driven in the direction of arrow f by the second drive gear 222 via the second take-up reel shaft gear 234 to obtain a playback state (FWD tape drive state).

Next, in the stopped state, when the fast forward button 84 is pushed up from the backward movement position shown by the imaginary line in FIG. Operation board 2
45,248 in common. In addition, fast forward button 8
4 is locked in its pushed up forward position. Both operation plates 245 and 248 are connected to the compression spring 2.
43 and are pushed up together to the solid line position in FIG. 26A. Then, as shown by the imaginary line in FIG. 25B, the first drive gear 221 is moved to the top position of its vertical movement range while maintaining the engaged state with the capstan gear 220 by the tip 245a of the first operation plate 245. and the second operation section 248
The conversion gear 229 is also moved by the tip 248a against the compression spring 230 to the top position of the vertical movement range. That is, the first drive gear 221 and the conversion gear 22
9 and 9 are moved together to the uppermost position while maintaining the gap g ₁ between them. By locking the fast forward button 84 at the forward movement position, these first
The drive gear 221 and the conversion gear 229 are maintained at their moved uppermost positions.

As a result of the above, the conversion gear 229 becomes the first drive gear 2.
21 is retracted and held in a position where it does not mesh with 21, and
The first drive gear 221 is meshed with the first take-up reel shaft gear 233. Note that the second drive gear 222
is moved together with the first drive gear 221 by the magnetic force of the clutch mechanism 223 and separated from the second take-up reel shaft gear 234.

When the fast forward button 84 is pressed, the motor 211 is driven to rotate, and as shown in FIG. Take-up reel shaft 7 via reel shaft gear 233
8 is rotated at high speed in the direction of arrow f to obtain a fast forward state (tape FF/CUE running drive state). At this time, when the first drive gear 221 is moved to the uppermost position, the first take-up reel shaft gear 233
Even if the first take-up reel shaft gear 233 is pushed up against the compression spring 238 because the first take-up reel shaft gear 233 cannot be properly engaged with the 1 take-up reel shaft gear 233
is pushed back downward by the compression spring 238,
It meshes correctly with the first drive gear 221.

Next, in the stopped state, when the rewind button 85 is pushed up from the backward movement position shown by the imaginary line in FIG. 26B to the forward movement position shown by the solid line, the operating arm 254 pushes the first operating plate 245. increase. Furthermore, rewind button 85
is locked in its pushed up forward position.
The first operating plate 245 is then pushed up against the compression spring 243 to the position shown by the solid line in FIG. 26B. Note that at this time, the second operation plate 248 is not pushed up in any way. However, at this time, the forward stroke S ₁ of the rewind button 85 and the fast forward button 84 is the same, but the fast forward button 84 pushes up both operating plates 245 and 248 with the upper end surface of the protrusion 255 of the operating arm 253. For,
The protrusion 256 of the operating arm 254 of the rewind button 85 is the first
is inserted into the notch 258 of the operation plate 245 of
The upper end surface of the operating arm 254 pushes up the first operating plate 245. Therefore, the height at which the first operation plate 245 is pushed up by the rewind button 85 is lower than the height at which it is pushed up by the fast forward button 84 by the height S of the protrusion 256 by ₂ minutes. Becomes height.

When the first operation plate 245 is pushed up as described above, as shown by the imaginary line in FIG. 25A,
The first drive gear 221 is moved to an intermediate position in its vertical movement range by the tip 245a of the first operation plate 245 while maintaining the meshing state with the capstan gear 220. When the rewind button 85 is locked at the forward position, the first
The drive gear 221 remains in its moved intermediate position.

As a result of the above, the first drive gear 221 becomes the conversion gear 2.
29, and the second drive gear 222 is disengaged from the second take-up reel shaft gear 234.

When the rewind button 85 is pressed, the motor 211 is driven to rotate, and as shown in FIG. The conversion gear 229 rotates the supply reel shaft 77 at high speed in the direction of the arrow h through the supply reel shaft gear 232, and the rewind state (REW/REV running state of the tape) is achieved. is obtained. Note that at this time, the first drive gear 2
21 is moved to the intermediate position, the conversion gear 229
The conversion gear 229 cannot be properly meshed with the
Even if the conversion gear 229 is pushed up against the compression spring 230, the moment the first drive gear 221 is rotationally driven, the conversion gear 229 is pushed back downward by the compression spring 230, and the first drive gear 221 is properly engaged.

The tape drive device 91 has been described above, and the stop button 8 is
When 2 is pressed, the rotation of the motor 211 is stopped and the motor 211 is returned to its initial stopped state. In addition, fast forwarding state,
When the stop button 82 is pressed in the rewind state, the fast forward button 84 and the rewind button 85 are unlocked.
These are respectively moved back to the return position by return springs. Along with this, both operation panels 245, 248
is moved back to the return position by the compression spring 243,
Both drive gears 221, 222 and conversion gear 250 are moved back to the lowest position shown in solid lines in FIG. 25A.

By the way, according to this tape drive device, the minimum number of parts consisting of both drive gears 221, 222, clutch mechanism 223, conversion gear 229, supply reel shaft gear 232, and both take-up reel shaft gears 233, 234 are used, and both drive gears 221, 222 and conversion gear 2
29 in the direction of the rotation axis, the playback status (FWD), fast forward (FF/CUE), rewind (REW/
REV) can obtain the running driving status of all the tapes. Therefore, the number of parts is very small,
It has a simple structure and is extremely low cost. Moreover, both drive gears 221, 222 and conversion gear 22
9 in the direction of their rotational axes, the movement space for these gears 221, 222, 229 can be accommodated within their arrangement space. Therefore, this tape drive device 91
is very compact and allows miniaturization of cassette tape recorders.

Next, the gear drive device 261 will be explained with reference to FIGS. 27A to 28B. Furthermore, this gear drive device 2
61, the same structure is adopted for the conversion gear 229 of the tape drive device 91 and the first take-up reel shaft gear 233, but in this case, the conversion gear 2
29 will be described.

First, when switching from the stop state to the rewind state, the first drive gear 221 is moved from the lowest position shown by the solid line in FIG. 27A to the intermediate position shown by the imaginary line, and Drive gear 221 is about to mesh with conversion gear 229. However, at this time, as shown in FIG. 28A, these two gears 22
1,229 is the mountain 2 of these tooth tips 262,263
When 62a and 263a come into contact with each other, these two gears 221 and 229 cannot mesh with each other. For this reason, the conversion gear 229 is the first drive gear 22
1 and escapes against the compression spring 230 as shown by the imaginary line in FIG. 27A. Then, the first drive gear 221 is held at an intermediate position, and after that, the first drive gear 221 starts rotating, and the peak 262a of the tooth tip 262 is connected to the conversion gear 22.
As shown in FIG. 28B, the conversion gear 229 is pushed back downward by the compression spring 230 at the moment when the conversion gear 229 shifts from the peak 263a of the tip 263 of the No. 9 tooth as shown in FIG. 28B.
As shown in Figure B, both gears 221 and 229 are meshed with each other.

However, when the modules of both gears 221, 229 are small and the rotational circumferential speed of the first driving gear 221 is high, the contact surfaces of both tooth tips 262, 263 of both gears 221, 229 in the axial direction are flat. If so, when the first drive gear 221 is rotated with the peaks 262a, 263a of the two tooth tips 262, 263 in contact with each other, as shown by the imaginary lines in FIG. 27A, the two tooth tips 262, 263, 263 are in surface contact with each other, so they easily slip on each other,
One ridge 262a of one tooth tip 262 moves from one ridge 263a of the other tooth tip 263 to the next ridge 263a.
As a result, it is difficult to obtain a state in which the tips 262 and 263 of the teeth can mesh with each other at the peaks 262a, 263a and the valleys 262b, 263b as shown in FIG. 28B. As a result, the first
Although the drive gear 221 of is rotating,
Not only is it impossible to obtain a meshing state between both gears 221 and 229, but also gear noise occurs.

However, in this gear drive device 261, a tooth tip 263 of the conversion gear 229 is provided with a tooth tip 263 that protrudes downward in the rotation axis direction and in the direction in which it is moved relative to the first drive gear 221, that is, in FIG. 27A. A sloped portion 264 is provided, and the tip 263a' of the peak 263a of the tooth tip 263 is connected to the tooth tip 26 of the first drive gear 221.
It was configured to make point contact with a flat surface 265 in the direction of the rotation axis of No. 2. As a result, as shown by the imaginary lines in FIG. 27A, when the first drive gear 221 is rotated with the peaks 262a and 263a of the two tooth tips 262 and 263 in contact with each other, both the tooth tips 262 and 263 are rotated.
62 and 263 can be suppressed to some extent (make it difficult to slip), and one ridge 262a of one tooth tip 262 can be quickly moved from one ridge 263a of the other tooth tip 263 to the next ridge 263a. This can prevent things like slipping.

That is, by providing the above-described inclined portion 264 on the tip 263 of the conversion gear 229, both gears 221,
229 is the peak 262 of these tooth tips 262 and 263
At the moment when the first drive gear 221 starts rotating with the teeth a and 263a in relative contact with each other from the direction of the rotation axis, the tips of both teeth 262 and 263 are prevented from slipping more than necessary, and as a result, one side tooth tip 2
62 ridge 262a to the valley 263 of the other tooth tip 263
b, the peak 263a can be immediately lowered without jumping over, and both gears 221 and 229 can be brought into mesh immediately.

Next, as shown in FIGS. 29 to 35B, the cassette tape recorder is put into the FWD (playback) state and the CUE state using the driving force from the tape drive device 91 described above.
The switching device 268 for switching between the (queue) state and the REV (review) state will be explained.

First, as shown in FIGS. 29, 33A, and 33B, a cylindrical member 269 is integrally attached to one side of the first drive gear 221 at a predetermined distance below the mechanical board 90. The regeneration button 83 is attached to this cylindrical member 269 so as to be movable within a certain range in the vertical direction. Next, as shown in FIGS. 29, 32A, and 32B, this regeneration button 83 and the first drive gear 221
The FWD lever 27 is located at the bottom of the mechanical board 90 between
0 is arranged so as to be freely movable in the front and rear direction.

Next, as shown in FIGS. 29 to 31, the FWD lever 270 is made of plastic, for example, and has a tip lever portion 271 and a rear lever portion 272 formed by a stepped portion 273. They are integrally molded together. And the tip lever part 2
A slope 274 is provided along the longitudinal direction on the side surface of the distal end of the playback button 269 side, and a recess 275 is provided at the rear end of the slope 274 in the longitudinal direction. An opening 276 having the shape shown in the figure is provided at the rear end of the tip lever portion 271, and a slit 279 is provided at the side surface of the rear end on the first drive gear 221 side. Also this
An operating arm 277 bent upward is provided at the rear end of the rear end lever portion 272 of the FWD lever 270, and a slit 278 is provided along the center of the operating arm 277. And this
A set-up lever 281 is arranged on one side of the slope 274 on the lower surface of the tip of the tip lever portion 271 of the FWD lever 270. The set-up lever 281 is made of plastic, for example, and is rotatably supported at the tip of the tip lever portion 271 via a fulcrum shaft 282. And this setup lever 281 is
The set-up lever 281 extends toward the rear end side in the longitudinal direction of the FWD lever 270.
At the tip of the driven claw 283 and stopper protrusion 2
84 are provided integrally with each other. Note that the driven pawl 283 protrudes from the side surface of the FWD lever 270 on the first drive gear 221 side. This setup lever 281 is connected to a fulcrum shaft 282.
It is inserted into the part and both ends are FWD lever 270,
A torsion spring 285, which is engaged with the set-up lever 281, rotates in the direction of arrow i in FIG. 31. Note that this setup lever 281 is the tip lever part 27 of the FWD lever 270.
The above-mentioned rotation is regulated by abutting a projection 284 on a stopper portion 286 provided integrally with 1.

Then, as shown in FIGS. 32A to 32D, 34A, and 34B, the FWD lever 2
70 is connected to the first
The guide pin 288 is disposed overlapping the lower surface of the operation plate 245 and is fixed vertically to the lower part of the mechanical board 90 through the opening 276, and is fitted into the tip of the guide pin 288. The attached washer 289 prevents it from coming off downward. Further, the operating arm 277 of the FWD lever 270 is inserted from below into a guide hole 290 provided at the rear end of the mechanical board 90, and a pair of locking locks are integrally provided on both left and right sides of the upper end of the operating arm 277. The guide hole 290 is opened by the claw 291.
It is fixed to the left and right edges of the. The FWD lever 270 is attached to the lower part of the mechanical board 90 as described above, and the operating arm 2 in the guide hole 290
77 in the forward and backward direction (longitudinal direction) within the movement range.
The operating arm 277 is configured to be freely movable in the guide hole 290, and at any position of the operating arm 277 within the guide hole 290, the operating arm 277 is configured to be freely rotatable in the left-right direction about the operating arm 277 portion. Note that this FWD lever 270 is biased to slide in the direction of arrow j in FIG. It is rotated in the direction.

Next, as shown in FIG. 29, the first drive gear 221 is made of plastic, for example, and has three drive claws 29 for driving the set-up lever 281 on the periphery of its lower surface.
5 are integrally provided.

Next, Figures 29 to 31, Figure 33A and 3
As shown in FIG. 3B, the regeneration button 83 is integrally provided with an operating arm 296 that extends to the lower part of the slope 274 of the FWD lever 270, and the upper end of the operating arm 296 has the slope 274. A slope 297 facing the is provided.

Next, FWD, CUE, and
The REV switching operation will be explained.

First, FIG. 32A shows a stopped state, and at this time, the FWD lever 270 has been moved back to the return position shown in the figure, and the set-up lever 281 is rotating the drive pawl 295 of the first drive gear 221. It is held in a position that is evacuated out of the moving trajectory. Note that in this stopped state, the playback button 83 is moved back downward as shown in FIG. 33A.

However, in the stopped state of the lever, the cassette 71 mentioned above
When the head board 158 is mounted, the head board 158 is pressed against the upper surface of the mechanical board 90 as described above, and as a result, as shown in FIGS. 29, 34A, and 34B, the stopper portion 1 of the blind plate 162
64 is the slit 2 at the rear end of the FWD lever 270
78 and the tip 1 of the head board 158
58a is inserted into the front position of the operating arm 277 of the FWD lever 270.

Next, in the stopped state, when the regeneration button 83 is pushed up from the backward movement position shown in FIG. 33A to the forward movement position shown in FIG. 33B, the slope 297 of the operating arm 296 is
It is pressed against the slope 274 of the lever 270. Note that the playback button 296 is locked in the forward movement position where it is pushed up.

However, at this time, the upper part of the tip lever portion 271 of the FWD lever 270 is pressed down by the first operation plate 245, so the operation arm 2 of the playback button 83
As a result of the pressing of the slope 274 of the FWD lever 270 by the slope 297 of 96, the wedge action at that time causes the FWD lever 270 to receive a pressing force in the direction of arrow l in FIG. 33B, as shown in FIG. 32B.
This FWD lever 270 is rotated against the tension spring 293 in the direction of arrow k' using the operating arm 277 as a rotation fulcrum. Then, as the regeneration button 83 is locked in the forward movement position, the FWD lever 2
70 is held in the rotated position shown in FIG. 32B. On the other hand, the rotation of the FWD lever 270 causes the driven pawl 283 of the set-up lever 281 to
enters the rotation locus of the drive claw 295 of the first drive gear 221.

However, by pressing the play button 83,
As described above, the tape drive device 91 enters the playback (FWD) state, and the first drive gear 221 is rotationally driven in the direction of arrow e in FIG. 32B.

Immediately after the first drive gear 221 starts rotating in the direction of arrow e, one of the drive pawls 295 comes into contact with the driven pawl 283 of the set-up lever 281, as shown in FIG. 32C. The drive claw 283 is moved through the set-up lever 281.
The spring 2 pulls the FWD lever 270 in the direction of arrow j'.
Move against 93.

It should be noted that when the FWD lever 270 moves in the direction of the arrow j', the slope 297 of the operating arm 296 of the regeneration button 83 relatively slides on the slope 274 of the FWD lever 270, and the slope 297 is disposed continuously on the slope 274 of the FWD lever 270. It is relatively moved toward the recess 275 side.

When the FWD lever 270 is moved to the position shown by the imaginary line in FIG. 32D, the playback button 8 is pressed.
The slope 297 of the operating arm 296 of 3 is the FWD lever 2
70 enters the recess 275 from the slope 274, and at that moment the FWD lever 270 moves its operating arm 277.
It is rotated in the direction of arrow k by the tension spring 293 using the portion as a rotation fulcrum, and is moved to the forward movement position shown by the solid line in FIG. 32D. As a result, the upper end of the operating arm 296 of the playback button 83 is connected to the recess 2 of the FWD lever 270 as shown in FIGS. 32D and 34B.
Relatively falling within 75, FWD lever 270
is engaged with the upper end of the operating arm 296 and locked in its forward position. In addition, FWD lever 27
0 is rotated in the direction of arrow k from the position shown by the imaginary line in FIG. 221 from the drive claw 295.

As a result of the above, the FWD lever 270 is moved in the direction of arrow j' from the backward movement position shown by solid lines in FIGS. 34A and 35A, respectively, to the forward movement position shown by solid lines in FIGS. 34B and 35B, respectively. It will be locked at that forward position. And on this occasion
The operating arm 296 of the FWD lever 270 is the mechanical board 9
0 in the same direction along the guide hole 290,
The operating arm 296 pushes up the tip 158a of the head board 158 in the same direction. As a result, the head board 158 is rotated about the fulcrum shaft 157 in the direction of the arrow b' in FIG. 13 against the torsional repulsive force of the torsion spring 163, and as shown in FIG. The head 100 is connected to the cassette 71.
The tape 300 is inserted deeply into the tape pad 301, and the tape 300 is clamped with a predetermined pressure force between the tape pad 301 and the tape pad 301. Meanwhile, at this time, the pinch roller 101 is also pressed against the capstan 79 via the tape 300 against the tension spring 167.

As described above, the switching operation to the FWD state is completed, the tape 300 is driven to run at a constant speed, and the tape 300 is played back in stereo by the playback head 100.

In the above FWD state, as the FWD lever 270 has been moved to the forward position, as shown by the solid line in FIG. 35B,
The edge of the first operation plate 245 relatively fits into the slit 279 of the FWD lever 270 and is held as it is.

Next, when the fast forward button 84 is pressed in the FWD state, the tape 300 is fast forwarded while the playback button 83 remains locked at the forward movement position.
It becomes CUE state.

That is, when the fast forward button 83 is pushed up from the backward movement position shown by the imaginary line in FIG. 26A to the forward movement position shown by the solid line, the first operation plate 245 is moved by the operating arm 253 to the position shown in FIG. 35B. It is pushed up from the backward movement position shown by the solid line to the forward movement position shown by the imaginary line. On the other hand, since this first operating plate 245 is engaged in the slit 279 of the FWD lever 270, the pushing up of the first operating plate 245 causes the FWD lever 270 to rotate its operating arm 277. The fulcrum is rotated in the direction of arrow m, that is, upward, as shown by imaginary lines in FIGS. 34B and 35B. At that moment, FWD lever 27
The concave portion 275 of 0 is disengaged upward from the upper end of the operating arm 269 of the regeneration button 83, the lock of the FWD lever 270 at the forward movement position is released, and the FWD lever 270 is moved by the tension spring 293 to the position shown in FIG. 32A. It is moved back to the indicated return position. At the same time, as the head substrate 158 is moved back by the torsion spring 163 in the direction of arrow b in FIG. 13, the reproduction head 100 is moved back to the return position shown in FIG. 34A. However, even at this time, the playback head 100 remains shallowly inserted into the cassette 71, and the tape 300 remains in light contact with the playback head 100 by the tape pad 301.

At this time, since the playback button 83 is pressed in advance, the fast forward button 84 is not locked in the forward position. Since the playback button 83 is locked in the forward position, the FWD lever 270, which has been returned to the return position shown in FIG. 32A, is moved in a direction parallel to the inclined surface 274.
As a result, the inclined surface 297 of the operating arm 296 of the playback button 83
As a result, the FWD lever 27
0 is not completely returned to the horizontal state as shown by the solid lines in Figs. 34A and 35A, respectively, but is maintained in a slightly inclined state as shown by the phantom lines, respectively.

On the other hand, when the fast-forward button 84 is pressed, the tape drive device 91 enters the CUE state as described above, and the tape 300 is fast-forwarded while being played back by the playback head 100.

Then, when the fast-forward button 84 that had been pushed up in the CUE state is released, the fast-forward button 84 moves to the 26th A.
It is moved back to the return position shown by the imaginary line in the figure, and at the same time, the first operation plate 245 is pushed back downward from the position shown by the imaginary line to the return position shown by the solid line in FIG. 35A. At that time, the first operation panel 2
45 is the tip lever part 271 of the FWD lever 270
From above to below, press the FWD lever 27.
0 is pushed back in the direction of arrow m'. As a result, the regeneration button 8 is pressed against the slope 274 of the FWD lever 270, similar to when the regeneration button 83 is pressed in the stopped state described above.
The slope 297 of the operating arm 296 of No. 3 is pressed, and due to the wedge action at that time, the FWD lever 270 is again rotated in the direction of arrow k' as shown in FIG. 32B, and the driven pawl 283 of the set-up lever 281
again enters the rotation locus of the drive claw 295 of the first drive gear 221.

As a result of the above, similar to when switching to FWD state,
After the fast forward button 84 is released, the FWD lever 270
is automatically moved to the forward movement position shown by the solid line in Figure 32D and locked, and the CUE state is removed from the previous position.
Automatically returns to FWD state.

Similarly to the switching operation to the CUE state described above, when the rewind button 85 is pressed in the FWD state, the tape 300 is rewound while the playback button 83 remains locked at the forward position. hand
It becomes REV state. Further, when the rewind button 85 is released in the REV state, the FWD state is automatically returned again.

Further, when the stop button 82 is pressed in the FWD state, the regeneration button 83 is unlocked at the forward position, and the regeneration button 83 is moved back to the backward movement position shown in FIG. 33A. As a result, the upper end of the operating arm 296 of the regeneration button 83 is released downward from the recess 275 of the FWD lever 270, which is locked in the forward position of FIG. 32D, and the FWD lever 270 is unlocked. . As a result, FWD lever 27
0 is moved back by the tension spring 293 to the backward movement position shown in FIG. 32A, and at the same time, the playback head 100 is moved back to the backward movement position shown in FIG. will be reinstated.

By the way, according to the switching device 268 described above,
The FWD lever 270 is directly operated by a wedge action using the regeneration button 83, and the FWD lever 270 is hooked by the drive pawl 295 of the first drive gear 221 that is rotationally driven by the motor 211 to move to the forward position. At the forward movement position, the FWD lever 270 is engaged with the operating arm 296 of the playback button 83 and locked. During this time, the FWD lever 270 is made to have a linear movement in its longitudinal direction and a rotational movement in a direction perpendicular to the longitudinal direction, and the return force of each of the linear movement and rotational movement is generated by one tension spring. 293, and furthermore,
The playback head 100 is moved by operating the head board 158 provided in the cassette holder 75 using the FWD lever 270.

Therefore, this switching device 268 is composed of the minimum necessary parts, and the number of parts and the number of assembly steps are extremely small. And switch to FWD state,
Since this can be done by effectively utilizing the rotational driving force of the motor 211, the regeneration button 83 can be configured as a very light feather touch type button. Also, the mechanism for switching to the CUE state and REV state is very simple.

Next, as shown in FIGS. 30, 36, and 37, a safety mechanism 304 provided in the switching device 268
Explain.

First, the upper end of the fulcrum shaft 282 has a flange portion 3.
05 is integrally provided, and this fulcrum shaft 282
is press-fitted from below into a cylindrical portion 306 that is integrally provided on the lower surface of the tip of the FWD lever 270 and is fixed therein. In addition, the setup lever 2
81 is made of plastic, for example, and has appropriate elasticity. This set-up lever 281 is inserted into the outer periphery of the cylindrical portion 306 through a through hole 307 provided at its end, and is centered around the cylindrical portion 306 in the directions of arrows i and i' in FIG. It is rotatably supported on.
The inner diameter of this through hole 307 is configured to be slightly larger than the outer diameter of the cylindrical portion 306, and the set-up lever 281 is rotated in the direction of arrows n and n' in FIG. 37 using the cylindrical portion 306 as a pivot point. It is configured to be rotatable.

On the other hand, the torsion spring 285 has both ends 285a,
The intermediate portion between the coil portions 285b is wound in a spiral shape to form a coil portion 285c. This torsion spring 285 is inserted by its coil portion 285c between the flange portion 305 and the set-up lever 281 on the outer periphery of the fulcrum shaft 282, and both end portions 285a, 285b are inserted between the lower surface of the tip of the FWD lever 270 and the set-up lever 281. They are respectively locked by locking pins 308 and 309 that are integrally provided on the lower surface of the up lever 281, respectively. Then, the coil portion 285c of the torsion spring 285 is twisted in the helical direction in advance, and
It is attached as described above while being compressed in a predetermined state in the vertical direction. Therefore, due to the torsional repulsive force of the coil portion 285c, the set-up lever 28
1 is rotated in the direction of arrow i in FIG. Further, due to the compressive repulsive force of the coil portion 285c, the set-up lever 281 is rotated in the direction of arrow n in FIG.
It is closely attached to the bottom surface of 71.

However, in the switching device 268 described above,
In a state where the position of the drive claw 295 of the first drive gear 221 is not specified in any way (it is completely unknown where the drive claw is located), the playback button 8 is pressed.
The FWD lever 270 is operated by the operating arm 296 of No. 3.
will be manipulated. Therefore, for example, if a structure is adopted in which the driven claw 283 is provided on the FWD lever 270 itself and the driven claw 283 is directly hooked on the drive claw 295, the position where the drive claw 295 stops depends on the drive claw 295. When the regeneration button 83 is pressed, the FWD lever 270 may be accidentally pinched and damaged between the operating arm 296 and the drive claw 295, or the FWD lever 270 may be damaged when the playback button 83 is pressed.
This may cause inconveniences such as the vehicle being accidentally run over and twisted and damaged.

However, according to this safety mechanism 304, FWD
A set-up lever 281 is attached to the lever 270, and this set-up lever 281 is attached to the third set-up lever 281.
Since the rotation force is applied in two directions: the direction of the arrow i in FIG. 6 and the direction of the arrow n in FIG. 37, the above-mentioned inconvenience does not occur at all.

That is, as shown in FIG.
1, the playback button 83 is pressed, and the FWD lever 27 is pressed by its operating arm 296.
0 is rotated in the direction of the arrow k', the set-up lever 281 comes into contact with the drive pawl 295 and moves away against the torsion spring 285 in the direction of the arrow i' to the position shown by the solid line. After this, the first drive gear 2
21 is rotated in the direction of arrow e and the drive claw 295 is moved in the same direction, the set-up lever 2
81 is the set position indicated by the imaginary line by the torsion spring 285, that is, the driven pawl 283 is at the driving pawl 29.
It is set to a position within the rotation locus of 5. Therefore, at this time, there is no adverse effect on the FWD lever 270, and the FWD lever 27
0 will not be damaged at all.

Next, as shown in FIG. 37, the above-mentioned
When switching to the CUE state, release the fast-forward button 84 that was being pressed, and the drive claw 295 of the first drive gear 221, which is returned downward together with the first operation plate 245, will move to the driven claw 2 of the set-up lever 281.
When pressed against the upper end surface of 83, the set-up lever 281 rotates in the direction of arrow n' and releases the torsion spring 285.
resist and flee to the position indicated by the solid line. Then, at the moment when the first drive gear 221 rotates in the direction of arrow e in FIG. is set to the set position. Therefore, at this time as well, the FWD lever 270
The FWD lever 270 will not be damaged. Moreover, according to this safety mechanism 304, since the set-up lever 281 is rotationally biased in two directions, i-direction and n-direction, by one torsion spring 285, there is no need to use two springs. , the number of parts and assembly man-hours are extremely small.

Next, the push button device 3 is shown in FIGS. 38 to 54B.
12. The push button lock device 313 and power switch device 314 will be explained.

First, as shown in FIG. 38, the stop button 8 is pressed.
2. The play button 83, fast forward button 84, and rewind button 85 are located at the bottom of the mechanical board 90, around the operation plate support shaft 241, which is a movement guide for the first and second operation plates 245, 248. installed in the arrangement shown. And as mentioned above, the play button 83,
The fast forward button 84 and the rewind button 85 are cylindrical members 269 and 25 that are integrally provided at the lower part of the mechanical board 90, respectively.
Similarly, the stop button 82 is also attached to a cylindrical member 317 that is integrally provided at the bottom of the mechanical board 90. These push buttons 82 to 85 are each configured to be movable in the vertical direction, which is a direction perpendicular to the mechanical board 90, at the bottom of the mechanical board 90. Furthermore, lock plates 3 are provided at the upper positions of these push buttons 82 to 85.
18 and a switch operation plate 319 are arranged, the switch operation plate 319 is closely attached to the lower surface of the mechanical board 90, and the lock plate 318 is attached to the switch operation plate 319.
It is attached closely to the bottom surface of the Further, this cassette tape recorder uses two power switches 323 and 324, a first power switch and a second power switch 324. The first power switch 323 is connected to the switch mounting plate 3 associated with the second operation plate 248.
attached to the lower part of the mechanical board 90 via 25,
The second power switch 324 is directly attached to the lower part of the mechanical board 90.

Next, the push button device 312 will be explained with reference to FIGS. 39 to 47.

First, the mounting structure of the stop button 82 will be explained with reference to FIGS.
A pushing operation part 328 having a substantially boat shape, a guide shaft part 329 provided at the upper part of the pressing operation part 328 in the longitudinal center thereof, and a locking shaft part 330 provided on the upper part thereof in a coaxial state, A pair of guide plate parts 331 provided at both longitudinal ends of the upper part of the pressing operation part 328 and a lock plate operation part 332 provided continuously to one guide plate part 331 are integrally formed with each other. Molded. A slit 333 is provided at the center of the tip (upper end) of the locking shaft portion 330, and a pair of locking pawls 334, which are formed into a conical shape as a whole, are provided on both sides of the tip. Further, a slope 335 is provided on one side of the upper end of the lock plate operation section 332. Further, a recess 336 is provided on the upper surface of the pressing operation section 328 around the guide shaft section 329.

On the other hand, the cylindrical member 317 is integrally molded from plastic to the mechanical board 90 by, for example, an outsert molding method. This cylindrical member 317 has a guide hole 33 that passes through it vertically.
7, and a spring receiving portion 339 having a locking hole 328 having a smaller diameter than the inner diameter of the guide hole 337 is provided at the upper end inside the guide hole 337. Further, a base 340 of this cylindrical member 317 is formed in a circular shape (hereinafter referred to as a circular base), and a portion lower than the circular base 340 is formed into a square shaft portion 341 . A pair of slits 342 are provided on both sides of the lower end of the square shaft portion 341.

The stop button 82 is inserted from below into the guide hole 337 of the cylindrical member 317 by its guide shaft 329, and both locking claws 3 at the tip of the locking shaft 330 are inserted into the guide hole 337 of the cylindrical member 317 from below.
34 is inserted into the locking hole 328 and locked using the elasticity of the slit 333. Therefore, in this attached state, the stop button 82 can move vertically within a certain range, but at this time, a compression spring 343 is stored in the guide hole 337 in advance, and the compression spring 343 causes the stop button 82 to move downward. has been energized again. In addition, in the above-mentioned installed state, the inside of the upper end of both guide plate parts 331 is connected to the square shaft part 3.
The stop button 82 is disposed close to the upper portions of both slits 342 of 41, and the stop button 82 is prevented from rotating by these two guide plate portions 331.

Next, the mounting structure of the regeneration button 83 will be explained with reference to FIGS. 42 to 44. The regeneration button 83 is integrally molded from plastic, for example,
A push operation section 345 having a boat shape, a guide shaft section 346 provided at the upper part of the push operation section 345 in the longitudinal center thereof, and the operation arm 296 provided on one side of the guide shaft section 346. , and a switch operating section 347 extending to one side from the upper part of one end of the pressing operating section 345 are integrally molded with each other. An operating shaft 348 made of a metal shaft is coaxially provided at the upper end of the guide shaft portion 346 and is integrally formed by, for example, an outsert molding method. Note that there is a conical portion 34 at the tip (upper end) of this operating shaft 348.
9 is provided, and an annular groove 350 is provided adjacent to the upper portion of the conical portion 349. Further, a pair of recesses 351 are provided on both sides of the base of the operating arm 296.

On the other hand, the cylindrical member 269 is integrally molded from plastic to the mechanical board 90 by, for example, an outsert molding method. This cylindrical member 269 has a guide hole 35 that passes through it vertically.
3, and a spring receiving portion 355 having an insertion hole 354 having a smaller diameter than the inner diameter of the guide hole 353 is provided in the vertically intermediate portion of the guide hole 353. A guide groove 356 is provided on one side of the cylindrical member 269, and both edges of the lower end of the guide groove 356 are formed into a pair of locking claws 357 that project inwardly. At the upper end of the guide groove 356, this cylindrical member 26
A slit 358 is provided at the base of the slit 9 in the radial direction thereof to a predetermined depth.

The regeneration button 83 is inserted from below into the guide hole 353 of the cylindrical member 219 by the guide shaft 346, the operating arm 296 is inserted into the guide groove 356, and the tip of the operating shaft 348 is inserted above the insertion hole 354. It can be installed by inserting it into the At this time, the operating arm 296 is inserted into the guide groove 356 by pushing the locking claws 357 apart against their elasticity, but after the insertion is completed, the locking claws 357 return to their original positions. It is elastically returned and engaged with both recesses 351 to prevent it from coming off. Therefore, in this attached state, the regeneration button 83 can be moved vertically within a certain range, but at this time, the compression spring 35 is inserted into the guide hole 337 in advance.
9 is housed therein, and the playback button 83 is urged downward in a double motion by its compression spring 359.

Next, the mounting structure of the fast forward button 84 and the rewind button 85 will be explained, but since the mounting structure of both 84 and 85 is the same structure, the mounting structure of the fast forward button 84 will be explained here in FIGS. 45 to 47. This will be explained using figures.

First, the fast forward button 84 is integrally molded from plastic, for example, and includes a round shaft-shaped push operation section 361 and a guide shaft section 36 provided on the top thereof.
2 and the operating arm 253 provided on one side of the guide shaft portion 362 are integrally molded with each other. An operating shaft 363 made of a metal shaft is coaxially and integrally provided at the upper end of the guide shaft portion 362 by, for example, an outsert molding method. Note that a conical portion 364 is provided at the tip (upper end) of the operating shaft 363, and an annular groove 365 is provided adjacent to the upper portion of the conical portion 364.

On the other hand, the cylindrical member 251 is integrally molded from plastic to the mechanical board 90 by, for example, an outsert molding method. This cylindrical member 251 has a guide hole 36 that passes through it vertically.
7 is provided, and a spring receiving portion 369 having an insertion hole 368 having a smaller diameter than the inner diameter of the guide hole 353 is provided in the vertically intermediate portion of the guide hole 367 . A guide groove 370 is provided on one side of the cylindrical member 251, and both edges of the lower end of the guide groove 370 are formed into a pair of locking claws 371 that project inwardly. At the upper end of this guide groove 370, this cylindrical member 25
1 is provided with a slit 372 cut in the radial direction to a predetermined depth.

Then, the fast forward button 84 is inserted from below into the guide hole 367 of the cylindrical member 251 by its guide shaft portion 362, the operating arm 253 is inserted into the guide groove 370, and the tip of the operating shaft 363 is inserted into the insertion hole 367.
It is inserted and attached above 68. At this time, the operating arm 253 is inserted into the guide groove 370 by pushing the locking claws 371 apart against their elasticity, but after the insertion is completed, the locking claws 371
elastically returns to its original position and is prevented from coming off.
Therefore, in this attached state, the fast forward button 84 can move vertically within a certain range, but at this time, a compression spring 373 is stored in the guide hole 367 in advance, and the compression spring 373 allows the fast forward button 83 to move downward. It has been energized again.

According to the push button device 312 configured as described above, the push buttons 82 to 85 can be molded in plastic, and the cylindrical members 251, 252, 269, and 317 can be integrally molded on the mechanical board 90 by an outsert molding method. Manufacturing is extremely simple. Regarding assembly, each push button 82 to 85 is attached to each cylindrical member 251, 252, 269, 317 on a mechanical board 90.
Assembling is extremely simple, as all you have to do is push them vertically and in the same direction from the bottom.

In this cassette tape recorder, the gear group of the tape drive device 91 described above is also operated by the push buttons 82 to
Since it can be assembled into the mechanical board 90 from the same direction as 85, it is extremely easy to introduce it into an automatic assembly machine.

Furthermore, in this cassette tape recorder, the push buttons 82 to 85 and the gear group of the tape drive device 91 are all located on the side of the mechanical board 90 opposite to the surface on which the cassette 71 is mounted.
Since it is configured to be incorporated within the projected area of
The external dimensions of the cabinet 73 are determined by the cassette 71.
The cassette tape recorder can be constructed with very small external dimensions as close as possible to the external dimensions of the cassette tape recorder, and the overall size of the cassette tape recorder has been significantly reduced.

Next, the locking device 313 will be explained with reference to FIGS. 48 to 50C.

First, the lock plate 318 is made of a thin metal plate, and three lock pieces 3 extend outward from an arc-shaped peripheral portion 377 centered on the circular hole 376.
78a, 378b, and 378c are provided radially at predetermined intervals. Further, a lock release pin 379 is vertically fixed at a predetermined position on the lower surface of the lock plate 318. Note that this lock plate 318 has a spring receiving portion 38 in a part of the periphery of the circular hole 376.
0 is provided, and openings 381 and 382 for insertion of the operating plate support shaft 241 and guide pin 288 are provided at other predetermined positions.

Next, this lock plate 318 is placed on the lower surface of the mechanical board 90 via a switch operation plate 319, which will be described later, and the circular hole 376 is inserted into the cylindrical member 317.
It is inserted into the outer periphery of a circular base 340 and is rotatably attached around the circular base 340 in parallel to the mechanical board 90. At this time, the three lock pieces 378a to 378c are inserted into the respective slits 358, 3 of the three cylindrical members 269, 251, 252, respectively.
72, 372, and its position in the vertical direction is regulated. The lower surface of the lock plate 381 opposite to the lock pieces 378a to 378c is pressed down by a presser plate 383 fixed to the mechanical board 90. In addition, the above-mentioned FWD is attached to this presser plate 383.
A spring receiver 292 for a tension spring 293 for backward movement of the lever 270 is provided. The lock plate 318 is urged to rotate in the direction of arrow O in FIG. 49A by a tension spring 384 stretched between the presser plate 383 and the spring receiving portion 380 of the lock plate 318. At this time, each slit 358, 37
One end of 2,372 is connected to each lock piece 378a~
Rotation regulating portion 385 in the direction of the arrow O of 378c
a, 385b, 385c, and each slit 358, 372, 372 according to its regulation.
The amount of insertion of each of the lock pieces 378a to 378c into the inside is regulated.

In addition, in this lock device 313, with respect to the distance r ₁ from the center of the cylindrical member 317, which is the center of rotation of the lock plate 318, to the center of the cylindrical member 269, which is the center of the operating shaft 348 of the playback button 83, The distance r ₂ from each cylindrical member 251, 252, which is the center of each operating shaft 363 of the fast forward button 84 and stop button 85, is configured to be long.

Next, push buttons 83 to 8 by this lock device 313
The locking and unlocking operations in step 5 will be explained.

First, FIGS. 49A and 50A show the stopped state, and all the push buttons 83 to 85 are pressed by the compression springs 34, respectively.
3,359,373,373.

Next, FIGS. 49B and 50B show the playback state in which the playback button 83 is pushed to the upper forward position and locked. That is, the playback button 83 is connected to the compression spring 359.
When pushed up to the forward movement position, the conical portion 349 of the operating shaft 348 touches the lock plate 31.
8 is pushed in the direction of arrow O' in FIG. 49B, and the lock plate 318 is rotated in the same direction against the tension spring 384. and operation shaft 348
At the moment when the annular groove 350 is pushed up to the same height as the lock piece 378a, the lock plate 318 is moved back in the direction of arrow O in FIG. 49B by the tension spring 384, and the lock piece 378a The playback button 83 is locked in the forward position.

Next, in Figures 49C and 50C, press the fast forward button 84.
is pushed to the upper forward position and locked, indicating a fast forwarding state. That is, when the fast forward button 84 is pushed upward to the forward movement position against the compression spring 373, the conical portion 364 of the operating shaft 363 moves the lock piece 378b of the lock plate 318 in the direction indicated by the arrow in FIG. 49C.
Push in the O' direction, and the lock plate 318 will release the tension spring 3.
84 and rotated in the same direction. At the moment when the annular groove 365 of the operating shaft 348 is pushed up to the same height as the lock piece 378b, the lock plate 318 is moved back in the direction of arrow O in FIG. 49C by the tension spring 384, and the lock piece 378b is When engaged within the annular groove 365, the fast forward button 84 is locked in the forward movement position.

By the way, when the regeneration button 83 is in the locked state shown in FIGS. 49B and 50B, the lock piece 378a
is held at a position slightly moved in the direction of arrow O' in FIG. 49B from the position in the stopped state shown in FIGS. It is held at a position slightly moved in the direction of arrow O' in FIG. 49B from the position in the state. However, when levering the distance
Since r ₂ is configured to be larger than r ₁ , both lock pieces 37 are larger than the moving distance in the direction of arrow O' at the engagement point P ₁ of the lock piece 378a with respect to the operating shaft 348.
8b, 378c engagement points with each operating shaft 363
The distance moved in the direction of arrow O at P ₂ is slightly larger.

Therefore, when the playback button 83 is in the locked state, the fifth
Even if you press the fast forward button 84 or the rewind button 85 upwards as shown by the imaginary lines in Figure 0B, these operating shafts 363
is not engaged with each lock piece 378b, 378c.

That is, when the playback button 83 is in the locked state, the fast forward button 84
By pressing the rewind button 85, these 84,
85 is not locked, and the playback button 83 is not unlocked, resulting in the CUE state mentioned above.
REV status is obtained.

In addition, contrary to the above, the fast forward button 84 and the rewind button 85
When the play button 83 is pressed while the button is being pressed, the fast forward button 84 and the rewind button 85 are unlocked, and the play button 83 is locked.

Also, play button 83, fast forward button 84, rewind button 85
When the stop button 82 is pushed upward against the compression spring 343 as shown by the imaginary line in FIG. Slope 335 of section 332
is pressed by the tip (lower end) of the lock release pin 379, and the wedge action at that time causes the lock plate 318 to rotate in the direction of arrow O' in FIG. 49B against the tension spring 384. At that moment, each lock piece 37
Play button 83 and fast forward button 8 from 8a to 378c
4. The rewind button 85 is unlocked and is moved back to the return position shown in FIG. 50A by compression springs 359, 373, and 373, respectively.

According to the lock device 313 configured as described above, the lock plate 318 made of a thin metal plate is used, and the push buttons 83 to 85 are locked by rotating the lock plate 318 parallel to the mechanical board 90. These push buttons 83 to 85
The reciprocating stroke of the lock can be made as small as possible, and the locking and unlocking can be performed extremely reliably. Therefore, the overall thickness of the cassette tape recorder can be made very thin.

Next, Fig. 48, Fig. 50A to Fig. 50C, Fig. 5
The power switch device 314 will be explained with reference to FIGS. 1 to 54B.

First, as shown in FIG. 48, the switch operation plate 319 is made of a thin metal plate,
It has a similar shape to the lock plate 318. That is, three protrusions 389a,
389b and 389c are provided radially at a predetermined interval. In this case, one protrusion 389
The length of the protrusion a is approximately 1/2 that of the other protrusions 389b and 389c. Also circular hole 3
A switch operating arm 390 is attached to one side from the periphery of 87.
is extended, and a spring receiving portion 391 is provided in another part of the periphery of the circular hole 387. Further, an opening 392 for insertion of the operating plate support shaft 241 is provided at a predetermined position.

As shown in FIGS. 50A to 50C, 53A, and 53B, this switch operation plate 319 connects the mechanical board 90 and the lock plate 31.
8, its circular hole 387 is inserted into the outer periphery of the circular base 340 of the cylindrical member 317, and it is rotatably attached around the circular base 340 in parallel with the mechanical board 90. . At this time, three projecting pieces 389a to 389c are inserted into the respective slits 358, 372, and 372. And the spring receiving part 391 and the pressing plate 383
It is biased to rotate in the direction of arrow O in FIG. 53A by a tension spring 393 stretched between. Similarly to the lock plate 318, each of the protrusions 389a to 3
89c is brought into contact with the rotation restriction portions 385a to 385c of each slit 358, 372, 372, and rotation in the direction of the arrow O is restricted. In this case, 2
The two protruding pieces 389b, 389c are inserted into the respective slits 372, 372, superimposed on the locking pieces 378b, 378c of the locking plate 318,
One protruding piece 389a is inserted only up to the entrance of the slit 358.

Next, as shown in FIGS. 51 to 54B,
The first and second power switches 323, 32
4 are both configured as leaf switches, each having a pair of leaf spring contacts 395a, 395b and 396a, 396b, which are respectively attached to mounting bodies 397, 398 made of an insulator. Note that an insulator 399 is attached to the tip of the leaf spring contact 395a, 396a on the movable side of each leaf switch.
400 is installed. The first power switch 323 is fixed to the lower surface of the switch mounting plate 325 by its mounting body 397, and the second power switch 324 is directly fixed to the lower surface of the mechanical board 90 by its mounting body 398. There is.

The switch mounting plate 325 is connected to the mechanical board 9 by a vertical piece 401 integrally provided in a part thereof.
It is pivotably supported vertically via a horizontal fulcrum shaft 403 on a support plate 402 vertically attached to the lower surface of the 0. The switch mounting plate 325 is supported by a tension spring 406 stretched between a spring receiving part 404 integrally provided in a part of the switch mounting plate 325 and a spring receiving part 405 integrally provided in a part of the support plate 402. In FIG. 54A, it is urged to rotate in the direction of arrow P (downward) and is held in a substantially horizontal state by abutting against a stopper portion 407 that is integrally provided on a part of the support plate 402.

In the above-mentioned installed state, the insulator 399 of the first power switch 323 is placed above the switch operating portion 347 of the playback button 83, as shown in FIG. 54A. Also, switch mounting plate 325
A protrusion 408 integrally provided on a part of the 53rd A
As shown in the figure, it is disposed close to the top of a projection 409 that is integrally provided on a part of the second operation plate 248. Further, the tip of the protrusion 410 integrally provided on a part of the switch mounting plate 325 is the fifth
As shown in FIG. 3A, the rewind button 85 is disposed close to the upper part of the operating arm 254. As shown in FIG. 53A, the tip of the switch operating arm 390 of the switch operating plate 319 is connected to the second
The power switch 324 is located close to the insulator 400 of the power switch 324.

Next, the on/off operation of the two power switches 323 and 324 by the power switch device 314 will be explained.

First, FIGS. 53A and 54 show the stopped state, and at this time both power switches 323 and 324 are
Both are in the off state.

Next, in this stopped state, when the regeneration button 83 is pushed upward and locked, as shown by the imaginary line in FIG. Press. As a result, both leaf spring contacts 395a, 395
b are pressed together, and this first power switch 323 is turned on.

Next, in the stopped state, when the fast forward button 84 is pushed upward and locked as shown in FIG. Press in the direction of arrow O′. As a result, as shown in FIG. 53B, the switch operating section 319
93 in the same direction, and the tip of the switch operating arm 390 connects to the second power switch 324.
The insulator 400 is pressed. As a result, both leaf spring contacts 396a and 396b are pressed together,
This second power switch 324 is turned on.

However, when levering, the conical portion 364 of the fast forward button 84 as described above causes the switch operation plate 319 to
The rotation operation in the direction of arrow O' in FIG. 3B is performed almost at the same time as this fast-forward button 84 is sufficiently pushed upward and locked at the forward movement position. Therefore, the second power switch 324 is activated by the fast forward button 84.
The fast forward button 84 is not turned on at the moment when it starts to be pushed up, but is turned on almost at the same time as the fast forward button 84 is locked at the forward movement position.

On the other hand, as described above, when the fast forward button 84 is pushed upward, the second operation plate 248 is pushed upward at the same time, and the protrusion 409 connects the switch mounting plate 325 via the protrusion 408. push upwards. Then, the switch mounting plate 325 is largely rotated in the direction of arrow P' against the tension spring 406, as shown in FIG. 54B, and the first power switch 323 is largely rotated upward.
That is, at the moment when the fast forward button 84 starts to be pushed upward, the first power switch 323 is rotated significantly upward. At this time, the switch operating section 3 is in the forward position of the playback button 83 shown by the imaginary line in FIG. 54B.
The first power switch 323 is pushed up to a higher position than the position 47.

Also, when the rewind button 85 is pushed upward and locked in the stopped state, the conical portion 364 of the operating shaft 363 is pressed against the protrusion 36 of the switch operating plate 319.
9b in the direction of arrow O' in FIG. 53B, the second power switch 324 is turned on at the tip of the switch operating arm 390 of the switch operating plate 319. At this time as well, when the rewind button 85 is pushed upward, the switch mounting plate 325 is pushed upward by the operating arm 254 via the protrusion 410 at the same time. 325 is largely rotated in the direction of arrow P' as shown in FIG. 54B.

By the way, both power switches 323 and 324 in this power switch device 314 are switches for supplying power to the motor 211.

Therefore, when the playback button 83 is pressed upward in the stopped state, the first power switch 323 is turned on at that moment.
is switched to the on state, and power is supplied to the motor 211.

On the other hand, when the fast forward button 84 or the rewind button 85 is pressed upward in the stopped state, these push buttons 84, 85
The second power switch 324 is not turned on until just before the push buttons 84 and 85 are locked in the forward position, and is turned on almost at the same time as these push buttons 84 and 85 are locked in the forward position. Then, power is supplied to the motor 211.

Note that when the stop button 82 is pressed in the playback state,
The playback button 83 is unlocked and this is the 54th
It is pushed back to the return position shown by the solid line in Figure A,
Since the switch operation part 347 is separated from the insulator 399 of the first power switch 323,
This first power switch 323 is turned off, and the power supplied to the motor 211 is cut off.

Similarly, in fast forward or rewind mode, press the stop button 8.
When 2 is pressed, fast forward button 84 and rewind button 8
5 are moved back to the backward movement position, the switch operation plate 319 is moved back to the return movement position shown in FIG. 53A by the tension spring 393, and the switch operation arm 390 is moved back to the second movement position. power switch 3
24, the second power switch 324 is turned off and the power supplied to the motor 211 is cut off. At this time, the switch mounting plate 325 is also moved back to the return position shown in FIG. 54A by the tension spring 406.

By the way, as shown by the imaginary line in FIG. 54A, in the playback state where the first power switch 323 is turned on by the playback button 83, the fast forward button 8 is pressed.
4 or rewind button 85 is pressed, the above-mentioned CUE or
When REV is operated, the moment these push buttons 84 and 85 begin to be pushed upward,
As shown in FIG. 54B, the first power switch 323 is rotated significantly upward and separated from the switch operating portion 347 of the playback button 83.
power switch 323 is turned off. Then, a little later, the push buttons 84 and 85 are locked in the forward movement position, and at the same time, the second button is pressed.
power switch 324 is turned on.

Therefore, when operating CUE or REV, press button 8.
The power to the motor 211 is cut off at the moment when the push buttons 84 and 85 start to be pushed upward, and then, almost at the same time as these push buttons 84 and 85 are locked in the forward movement position, the power is turned on to the motor 211 again. will be supplied.

However, the power switch device 314 described above
According to the above-mentioned tape drive device 91, when switching from a stopped state to a fast forward state (FF) or a rewind state (REW), the first drive gear 221 is connected to the first take-up reel shaft gear 233.
Alternatively, after the conversion gear 229 is completely engaged, power can be supplied to the motor 211 to rotate these gear groups. Furthermore, when switching from the regeneration state to the CUE state or the REV state, the power supplied to the motor 211 is cut off at the moment the first drive gear 221 starts to be pushed upward, and the first drive gear 221 is stopped, and after this first drive gear 221 has completed meshing with the first take-up reel shaft gear 233 or conversion gear 229, power is supplied to the motor 211 again and the first drive gear 221 is stopped. The rotational drive of the drive gear 221 can be restarted.

Therefore, according to this cassette tape recorder,
When switching all gears (FWD, FF/CUE, REW/REV), the gear group can be rotated by the motor 211 with the gear group always fully meshed, and significant gear noise will occur at the start of the rotation drive. There is no such thing as letting it happen.

That is, for example, the first drive gear 221 is rotated and moved in the direction of the rotation axis, and then the first drive gear 221 is moved to the first take-up reel shaft gear 233 or the conversion gear 22.
9, at the start of meshing, the gears 221 and 233 or 229 will rub against each other on the sides of their tooth tips, causing significant gear noise (sound of gears rubbing against each other). Not only that, but the tips of these teeth are severely worn away, which is an inconvenience. However, according to this cassette tape recorder, the aforementioned power switch device 314 prevents the above-mentioned inconvenience.

Next, the lid 74 is shown in FIGS. 55 to 58B.
The regeneration state automatic release device 413 by opening operation will be explained.

First, as shown in FIGS. 55 to 57, a lock release lever 414 is rotatably supported on the lower surface of the rear end side of the mechanical board 90 via a fulcrum shaft 415. And this lock release lever 414
One end is integrally provided with a rising portion 414a which is raised upward and has a substantially V-shape, and this rising portion 414a extends upward from an opening 416 provided in the mechanical board 90. is inserted into a lower position of the guide support 190 of the cassette holder 75. Further, the other end of the lock release lever 414 is integrally provided with a falling portion 414b that hangs downwardly, and this falling portion 414b is rotated by the tension spring 384 of the lock plate 318. end 41 on the force side (the side in the direction of arrow O in Fig. 55)
7. On the other hand, the guide support 19
0 is integrally provided with a lock release part 418 at its lower part, and this lock release part 418 is arranged opposite to the slope 419 of the rising part 414a.

By the way, as described above, in this cassette tape recorder, first, the cassette holder 75 is rotated to the cassette insertion position shown in FIG. 9A.
The cassette 71 is inserted into the cassette, and then the cassette holder 75 is rotated using the cassette lid 74 to the cassette mounting position shown in FIG. 9B, and the cassette 71 is mounted. At this time, as shown in FIG. 34A, the tip 1 of the head board 158 attached to the cassette holder 75
58a is the operating arm 277 of the FWD lever 270.
engage in the front position of the Next, by pressing the regeneration button 83 to lock it in the forward position, the FWD lever 270 is advanced to the forward position using the rotational driving force of the motor 211 and locked, as shown in FIG. 34B. let At this time, the operating arm 277 of the FWD lever 270 pushes the tip 158a of the head board 158 to move the head board 158 forward to the forward position shown in FIG. 34B and hold it there. It is configured so that the state can be obtained.

Therefore, in this cassette tape recorder, in the above playback state, the cassette lid 74 is suddenly opened without pressing the stop button 82, and the cassette holder 75 is rotated to the cassette insertion position shown in FIG. 9A. If something happens that causes you to
Thereafter, when the cassette holder 75 is again rotated to the cassette mounting position shown in FIG. 9B, the FWD lever 270, which remains locked in the forward position as shown in FIG. 34B, is moved. The tip 1 of the head board 158 is attached to the upper end of the operating arm 277.
58a was unexpectedly collided with, and both of them 270,
158 may be mutually damaged.

That is, in the reproducing state shown by the solid line in FIG. 58A,
When the cassette holder 75 is rotated in the direction of arrow a to the cassette insertion position indicated by the imaginary line, the tip 158a of the head board 158 is pulled out above the operating arm 277 of the EWD lever 270. At the next moment, the head board 158 is moved backward in the direction of arrow b in FIG. 13 by the backward force of the torsion spring 163, and is moved from the forward movement position shown by the dotted line to the solid line in FIG. 58B. It is moved back to the return position. Therefore, if the cassette holder 75 is rotated again in the direction of arrow a' in the state shown in FIG.
and the upper end of the operating arm 277, causing both of them to be damaged.

However, according to this regeneration state automatic release device 413, the above-mentioned inconvenience can be prevented.

That is, in the playback state, when the cassette holder 75 is rotated in the direction of arrow a from the cassette mounting position shown by the solid line in FIG. 57, the lock release portion 418 pushes the slope 419 of the rising portion 414a of the lock release plate 414, and the wedge action at that time causes the lock release plate 414 to move in the direction shown in FIGS. It is rotated in the direction of arrow Q in Fig. 57. Then, the falling portion 414b of the lock release plate 414 pushes the end portion 417 of the lock plate 318, and this lock plate 318
55 against the tension spring 384.
Rotate in the O′ direction. As a result, the playback button 83 is unlocked as described above, and the cassette tape recorder is automatically returned to the stopped state. As described above, when the regeneration button 83 is unlocked, the FWD lever 270 is unlocked at the forward position, and this FWD lever 270 moves from the forward position shown by the solid line in FIG. 58B to the imaginary line. Since the cassette holder 75 is moved back to the indicated return position, even if the cassette holder 75 is subsequently rotated to the cassette mounting position again, the tip 158a of the head board 158 will not be
There is no possibility that the upper end of the operating section 277 of the FWD lever 270 will be accidentally collided with.

According to this playback state automatic release device 413, even when the cassette holder 75 is rotated to the cassette insertion position in the fast forward or rewind state,
Similarly to the above, lock plate 318 is shown in FIG.
By rotating it in the O' direction, the fast forward button 84 and rewind button 85 are automatically unlocked. Contrary to the above, when the cassette lid 74 is open, the push buttons 83 to 85 cannot be locked even if pressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the reproduction-only machines shown in the embodiments, but is of course applicable to both recording and reproduction machines.

Furthermore, the structures and shapes of the cassette holder, head substrate, torsion spring, etc. referred to in the present invention are by no means limited to those shown in the embodiments.

As described above, the present invention provides a fulcrum shaft in the cassette holder, attaches the head board so that it can rotate freely around the fulcrum shaft, and move freely within a certain range in the axial direction of the fulcrum shaft, and a torsion spring. A coil portion is inserted into the outer periphery of the fulcrum shaft portion, and both ends of the torsion spring are engaged with the cassette holder and the head board, and the head board is moved to the fulcrum by the torsional repulsive force of the coil portion of the torsion spring. The cassette is energized to rotate around the shaft, and the head board is energized to move in the axial direction of the fulcrum shaft by the compressive repulsive force of the coil portion of the torsion spring, and the cassette is moved to the cassette mounting position by the cassette holder. The cassette tape recorder is constructed such that when mounted, the head board is pressed onto the mechanical board against the compression repulsion of the coil portion of the torsion spring, thereby regulating the height of the head board.

Therefore, according to the present invention, when the cassette holder is rotated and the cassette is mounted on the cassette mounting position on the mechanical board, the head board is pressed onto the mechanical board against the compressive repulsive force of the coil portion of the torsion spring. Let me,
Since the height of the head can be regulated,
When the cassette is attached, the height of the head relative to the cassette (tape) can be accurately regulated at all times to prevent tracking errors during playback. In addition, the structure allows one torsion spring to be used both for urging the head board to rotate around the fulcrum shaft and for urging the fulcrum shaft to move in the axial direction, which reduces the number of parts and assembly. It requires less man-hours and has a very simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a cassette tape recorder. Fig. 1 is an overall perspective view with the cassette lid open, and Fig. 2 is a perspective view of the cassette tape recorder with the cassette lid closed. Overall perspective view, 3rd
The figure is a perspective view of the entire unit as seen from the bottom side, Figure 4 is an exploded perspective view of the cabinet, mechanical board, plastic mold chassis, cassette holder, and cassette lid, and Figure 5 is a partially cutaway perspective view of the tape recorder body and cassette holder. , an exploded perspective view of the cassette lid, FIG. 6 is an enlarged partially cutaway front view of the locking mechanism portion of the cassette lid, FIG. 7 is an overall plan view of the cassette lid with a portion cut away, and FIG. 8 is an exploded perspective view of the cassette lid. 9 is an exploded perspective view illustrating the attachment structure of the leaf spring to the holder;
Figures A and 9B are an enlarged sectional view taken along the line 9-9 in Figure 7 to explain the cassette mounting operation;
Figure 0 is a partially cutaway perspective view illustrating the battery storage device, Figure 11 is a sectional view taken along the line 11-11 in Figure 10, and Figure 12 is a sectional view taken along the line 12-12 in Figure 10. , FIG. 13 is a perspective view of the holder body of the cassette holder, FIG. 14 is a partially cutaway front view of FIG. 13, and FIG. 15 is an enlarged view of the fulcrum shaft of the head mounting device. A cross-sectional view, FIG. 16 is a cross-sectional view taken along the line 16-16 in FIG.
Figure 7 is an enlarged sectional view of the azimuth adjustment device part, the first
8 is a cross-sectional view as seen from the line 18-18 in FIG. 17, FIG. 19 is an enlarged partially cutaway front view of the tape guide device, and FIG. 21 is a perspective view of the tape guide device portion, FIG. 22 is a perspective view of the tape drive device viewed from the bottom side, and FIGS. 23A and 23B explain the tape drive operation. Bottom view of tape drive, Figure 24 is Figure 23A, Figure 24-24
25A and 25B are front views of FIG. 24 for explaining the tape drive operation, and FIG. 26A is a cross-sectional view of FIG. 23A, 26A-26.
FIG. 26B is an expanded cross-sectional view as viewed from line A, FIG. 26B is an expanded cross-sectional view as viewed from line 26B-26B in FIG. 28A and 28B are bottom views explaining the gear drive operation, Figure 29 is a perspective view of the switching device seen from the bottom side, and Figure 30 is an exploded perspective view of the FWD lever seen from one side. Figure 31 is a perspective view of the FWD lever seen from the other side, Figures 32A to 32D are bottom views illustrating the switching operation of the switching device, and Figures 33A and 33B are FWD levers operated by the regeneration button. 34A and 34B are enlarged cross-sectional views explaining the operation of
Figures 35A and 35B are enlarged cross-sectional views explaining the operation of the head board using the FWD lever, Figures 35A and 35B are cross-sectional views explaining the operation of the FWD lever using the first operation plate, and Figure 36 is an enlarged bottom view of the safety mechanism of the switching device. Figure 37 is a side view as viewed from the line 37-37 in Figure 36, Figure 38 is an enlarged bottom view of the push button device, lock device, and power switch device, and Figure 39 is the bottom side of the stop button. An exploded perspective view as seen from
Figure 40 is a front view of the stop button installed, Figure 41
The figure is a sectional view taken along the line 41-41 in Fig. 40,
Figure 42 is an exploded perspective view of the regeneration button viewed from the bottom side, Figure 43 is a front view of the regeneration button installed, and Figure 44 is a sectional view taken along the line 44-44 in Figure 43. , Fig. 45 is an exploded perspective view of the fast-forward button section as seen from the bottom side, Fig. 46 is a front view of the fast-forward button installed, and Fig. 47 is Fig. 46-47-4.
48 is an exploded perspective view of the lock plate and the switch operation plate as viewed from the bottom side, and FIGS. 49A to 49C show the locking and unlocking operations of the locking device. 50A to 50C are exploded sectional views illustrating the locking and unlocking operations of the locking device, and FIG. 51 is a partially cutaway bottom view of the power switch device as seen from the bottom side of the switch mounting plate. FIG. 52 is an enlarged perspective view of the state, and FIG.
Figures A and 53B are partially cutaway bottom views illustrating the switch operation of the power switch device;
54 and 54B are side views for explaining the operation of the switch mounting plate of the power switch device, FIG. 55 is a partially cutaway bottom view of the regeneration state automatic release device, and FIG.
FIG. 57 is a perspective view of the lock release lever portion, and FIGS. 58A and 58B are cross-sectional views explaining the operation of the automatic reproduction state release device. . Also, in the symbols used in the drawings, 71...
Compact cassette, 72... Tape recorder body, 75... Cassette holder, 90... Mechanical board, 97... Cassette mounting device, 98... Holder body, 100... Playback head (head), 104
a, 104b...Fully shaft of cassette holder, 15
3... Head mounting device, 157... Fulcrum shaft of head board, 158... Head board, 163... Torsion spring, 163a, 163b... Both ends of torsion spring,
163c...Torsion spring coil part, 175a, 1
75b is a locking hole.

Claims (1)

[Scope of utility model registration request] A fulcrum shaft is provided in the cassette holder, and the head board is attached to be rotatable around the fulcrum shaft and movable within a certain range in the axial direction of the fulcrum shaft, and the coil portion of the torsion spring is attached to the fulcrum shaft portion. and the both ends of the torsion spring are locked to the cassette holder and the head board, and the head board is rotated about the fulcrum shaft by the torsional repulsive force of the coil part of the torsion spring. and urging the head board to move in the axial direction of the fulcrum shaft by the compressive repulsive force of the coil portion of the torsion spring;
When the cassette is mounted in the cassette mounting position using the cassette holder, the head board is pressed against the mechanical board against the compressive repulsive force of the coil portion of the torsion spring, thereby regulating the height of the head board. A cassette tape recorder consisting of.