JPS6339982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder capable of fast forwarding and rewinding.

In a tape recorder capable of fast forwarding and rewinding, it is necessary to move the pinch roller away from the capstan and back to a position where it does not contact the tape surface during fast forwarding or rewinding. If the pinch roller can be fixed in the retracted position and fast-forwarded and rewinded, the tape can be fast-forwarded and rewinded.
This is preferable because the operator does not have to manually maintain the fast-forward/rewind lever at the fast-forward or rewind position, and the operation is easy. However, conventionally known tape recorders are disadvantageous in that special locking mechanisms are provided for fast forwarding and rewinding, which increases the number of parts and complicates the structure.

The object of the present invention is to provide a tape recorder that can extremely easily perform fast forwarding and rewind locking without increasing the number of parts.

In order to achieve this object, according to an embodiment of the present invention, when the fast-forward/rewind lever is rotated for fast-forwarding or rewinding, an engaging portion provided at one end of the fast-forwarding/rewinding lever is By engaging the pinch roller support plate, the pinch roller support plate is rotated and the pinch roller is moved to a retracted position where it does not come into contact with the tape surface. Here, the pinch roller support plate is urged toward the capstan by a spring member. When the fast-forward/rewind lever rotates, the pinch roller support plate is held engaged with the fast-forward/rewind lever against the biasing force of the spring member, thereby locking the fast-forward/rewind lever. Therefore,
The fast forward/rewind levers are also locked for fast forwarding/rewinding, and fast forwarding/rewinding is maintained even if the fast forward/rewind lever is released.

An embodiment of the present invention will be described in detail below with reference to the drawings.

First, an outline of a tape recorder 10 according to the present invention will be explained with reference to FIG. The tape recorder 10 includes a movable chassis 16 rotatably attached to a fixed chassis 14 by a pair of pivot pins 11 and 12. And movable chassis 1
6 rotates and rises when the locking mechanism 20 is released by insertion of the cassette 18, similar to the Stahl system. The cassette 18 is a movable chassis 16
When raised, it is supported on the reel mechanism 22, and rotational torque is transmitted from the motor 24 to the reel mechanism 22 via the power transmission mechanism 26. A head supporting plate 30 having a pair of recording/playback heads (recording/playback heads) 27 and 28 is rotatably fixed to the chassis 1.
4 is installed on top. These recording/playback heads 2
7 and 28 may be used as 4-track 2-channel heads, and are arranged equidistantly from the center of rotation. A rotatable cam plate 32 for rotating this head support plate to switch its protruding head and a plunger mechanism 34 for operating the cam plate are similarly mounted on the fixed chassis 14. Furthermore, a rotatable pinch roller support plate 40 having a pinch roller 38 at one end for pinching the tape between it and the capstan 36 on the movable chassis 16 is mounted on the fixed chassis 14 and positioned above the head support plate 30. ing. By rotating the pinch roller support plate 40 and retracting the pinch roller 38, fast forwarding and rewinding of the tape is possible.
A rewind lever 42 is mounted on the stationary chassis 14. Further, an erase head 44 is mounted on the fixed chassis 14 so as to be movable forward and backward, and an erase head switching mechanism 46 is provided for controlling the forward and backward movement of the erase head. In addition to these mechanical components, a head circuit changeover switch 48 and a motor polarity changeover switch 50 are attached to a printed circuit board (not shown) below the stationary chassis 14, and a tape feed direction indicating switch 52 is attached on the stationary chassis 14. . Each component of the above-mentioned mechanism and other mechanisms other than the above will be explained in detail below. Here, the direction in which the cassette is inserted, that is, the direction in which the tape is fed from left to right when viewed from the right side of Figure 1, is called the forward direction, and the opposite direction, that is, the direction in which the tape is fed from right to left, is called the reverse direction. .

As can be seen from FIG. 1, the reel mechanism 22 includes a pair of reel stands 60 and 160. It goes without saying that the reel stands 60, 160 change to the supply side or the winding side depending on the rotational direction of the motor. Regarding the configuration of the supply side reel stand 60 during forward running, as shown in FIGS. 2 and 3, the reel stand 60 is a flanged reel with a thread cut at the upper end and a slit formed therein. A one-way latch means 64 having a shaft 62 and a key fitted into a slit in the reel shaft.
The reel stand main body 66 is attached to the reel shaft via the reel shaft. And the reel stand body 66
A pulse generating magnetic ring 68 in which N and S poles are alternately formed is attached to the outer periphery of the ring. Further, a drive pawl 72 is screwed into the male threaded portion of the reel shaft 62 via a compression spring 70. Here, the reel shaft 62 is loosely fitted around the outer periphery of a gear shaft 75 of a reel gear 74 that constitutes a part of a power transmission mechanism 26, which will be described later. The reel gear 74 is fixed to the gear shaft 75 via a collar 76, and by screwing a nut 78 into the male thread at the lower end of the shaft 75, the reel stand 60 is attached to the movable chassis 16.
Fixed. The reel stand main body 66 is attached to the reel shaft 62 by attaching an E ring 82 to the annular groove 80 at the free end of the gear shaft 75. The one-way clutch means 63 includes a clutch plate 83 in which three spiral notches are equiangularly formed on the outer periphery, a felt plate 84 disposed between the clutch plate and the reel stand main body 66, and a clutch plate 83. Three steel balls 86 are respectively disposed within the spiral notches of the plate. These steel balls 86 are connected to the reel gear 74
The clutch plate is formed in a size that allows it to move freely within the gap defined between the inner peripheral surface 87 of the clutch plate and the notch of the clutch plate. Further, as shown in FIG. 4, the take-up side reel stand 160 is different from the supply side reel stand except that the spiral direction of the spiral notch in the clutch plate is reversed and the magnetic ring 68 is not provided. It has the same configuration as 60. The components of the take-up reel stand 160 are the supply reel stand 60.
100 plus reference numerals to corresponding components.

The rotational torque of the motor 24 is transmitted from the motor pulley 90 to the capstan 36 and the reel shafts 62, 16 via the power transmission mechanism 26 consisting of a gear train, without passing through an idler lever or the like as in the conventional case.
It is transmitted to 2. This power transmission mechanism 26 is
As shown in FIG. 4, a capstan gear 92 is attached to the capstan shaft, and a pair of reel gears 7 are attached to the reel shafts 62, 162.
4,174, and an intermediate gear 94 located between the capstan gear and the reel gear.
The rotational torque of the motor 24 is determined by the motor pulley 9.
0 to the capstan 36 via the flywheel 96, and from there to the capstan gear 9.
2. It is transmitted to the respective reel gears 74 and 174 via the intermediate gear 94. Here, a rubber tire 98 is disposed on the rim of the flywheel 96.

When the motor pulley 90 of the motor 24 rotates counterclockwise as shown in FIG. 4, the capstan 36 and reel gears 74, 174 all rotate clockwise. Considering the reel stand 60 on the supply side, when the reel gear 74 rotates clockwise, the steel balls 86 escape in the direction of the larger gap due to contact with the inner circumferential surface 87 of the reel gear, and the inner circumferential surface and the clutch plate 83
There is no frictional force between them as they idle between them. Therefore, the clutch plate 83 does not rotate, and naturally the reel stand main body 66 and reel shaft 62 also do not rotate. On the other hand, the reel stand 1 on the winding side
At 60, the inner peripheral surface 187 of the reel gear 174
Due to the contact with the steel ball 186, the steel ball 186 moves in the direction of the smaller gap, creating a wedge effect. Therefore, the inner peripheral surface of the reel gear 174 and the clutch plate 183
Frictional force is generated between the clutch plate 183 and
Rotate clockwise. clutch plate 18
3, the reel stand main body 166 also rotates via the felt plate 184, whereby the reel stand 160 performs a tape winding function. On the other hand, if the motor pulley 90 rotates in a clockwise direction (not shown), the clutch plate 83 and
The felt plate 84 and the reel stand main body 66 rotate, and the reel stand 60 performs a tape winding function.

As described above, the power transmission mechanism 26 includes the capstan gear 92, the intermediate gear 94, the reel gears 74, 1
74, and a reel stand 6 on the winding side and the supply side.
Although the corresponding reel gears 74, 174 of 0.0, 160 are being rotated at the same time, the one-way clutch means 64, 164 rotates only one of the reel bases to be the winding side. Therefore, by reversing the direction of rotation of the single motor 24, forward running or reverse running of the tape can be easily set.

The reversing operation of the motor 24 is performed when the end is detected or whenever necessary. A magnetically sensitive element 100 for sensing reversal of the motor and switching the protruding head is disposed adjacent to the magnet ring 68, as shown in FIGS. 1 and 4. This magnetic sensing element 100 generates a signal by sensing pulse fluctuations of a pulse generating magnetic ring 68 in which N and S poles are alternately formed, and the signal is transmitted to a signal processing circuit 102 and a logic circuit as shown in FIG. 10
4. The plunger drive circuit 106 sequentially processes and operates the plunger mechanism, thereby rotating the head support plate 30 and switching the protruding heads. Here, the magnetic ring 68 that generates pulses for the magnetically sensitive element 100 is connected to the reel stand main body 66.
attached to the outer periphery of the However, the motor pulley 90 can also be a magnetic ring, and if configured in this way, the number of parts will be reduced and assembly will be easier. In that case, it goes without saying that the magnetically responsive element is arranged adjacent to the motor pulley 90.

As shown in FIGS. 1 and 6, the plunger mechanism 34 includes a plunger 110 and a plunger body 112 that is connected to the plunger drive circuit 106 and in which the plunger reciprocates.
The upper surface of the free end of the plunger 110 is a flat surface 113. A connecting plate 1 transmits the reciprocating motion of the plunger 110 to the cam plate 32 for rotating the head support plate.
One end of 14 is attached to this plane 113. Specifically, a pin 116 implanted at one end of the connecting plate 114 extends through a through hole drilled in the flat surface 113, and the connecting plate 114 is attached to the plunger 110 by an E-ring (not shown). There is. The planting pin 116 also extends upward through the connecting plate 114. A plunger arm 118, which is located above the connecting plate 114 and has a long groove that allows the implant pin 116 to reciprocate, is rotatably disposed on the fixed chassis 14 adjacent to the plunger 110. In addition, the guide groove 1 with a triangular cross section
20 is formed on the plunger 110 so as to prevent the plunger 110 from rotating and guide its reciprocating motion.

As can be clearly seen in FIG. 6, the pinch roller support plate 40 is located between the plunger arm 118 and the connecting plate 114. Pinch roller support plate 4
0 is the chassis 1 that fixes the integral collar that extends upwards.
It is disposed on the fixed chassis by loosely fitting it into the planting shaft 121 on the top of the shaft and attaching an E-ring to the shaft. A torsion coil spring 188 is disposed around the planting shaft 121 to apply a counterclockwise biasing force to the pinch roller support plate 40. Here, one end of the torsion spring 188 is in contact with the side surface of a cylindrical base provided with an eccentric pin 197 (see FIG. 8), which will be described later, and the other end is bent upward and abuts against the side surface of the pinch roller support plate. There is.

Further, a pinch roller 38 is rotatably attached to one end of the pinch roller support plate 40, and an engaging portion provided on the fast forward/rewind lever 42 is provided at the other end. A notch 123 that can come into contact with the implant pin 122 is formed. Further, a protruding piece 124 located between the cam plate 32 and the plunger arm 118 is formed on the support plate 40. The protruding piece 124 has an implant pin 126 on its upper surface that fits into a groove in the bifurcated free end of the plunger arm 118. As shown in the figure, one end of the pinch roller support plate 40 on which the pinch roller 38 is supported is formed into a T-shape.
Each tip is a bent piece 128,1 extending downward.
29.

In order to avoid complicating the drawings, the shafts and pins that are the centers of rotation are particularly indicated with ≦ marks in other figures except for FIG. 1.

As you can see from Figure 7, pin 1 extends downward.
30 is implanted at the other end of the connecting plate 114, and a tension coil spring 131 is stretched between the pin 130 and the fixed chassis 14. The tension spring 131 presses the implant pin 130 against the side surface of the heart-shaped cam groove 132 of the cam plate 32.
The heart-shaped cam groove 132 has two corners 133, 13
4 and left and right grooves 135, 136, and a V-shaped piece 137 is formed between the left and right grooves. When the tape runs in the forward direction and the recording/reproducing head 27 protrudes, the planting pin 130 is pressed against the corner 133. Large and small planting pins 138 and 139 protrude from the upper surface of the cam plate 32, and a torsion coil spring 142 serving as a toggle spring is provided between the large planting pin 138 and the planting pin 140 on the fixed chassis 14.
is installed. The cam plate 32 has a rotating pin 144
The V-shaped piece 137 is rotatably attached to the fixed chassis 14 by means of a screwdriver, and in the illustrated state, the V-shaped piece 137 is located below an imaginary line connecting the pin 144, which is the center of rotation, and the implanted pin 130. The cam plate 32 is further integrally provided with a bifurcated projecting piece 148, and the movable contact piece 14 of the tape running direction indicating switch 52 is disposed in the long groove of the projecting piece.
9 is fitted. The switch 52 is the movable contact piece 1
A pair of fixed contact pieces 150 and 151 are sandwiched between the movable contact piece and one of the fixed contact pieces, and the tape running instruction circuit is closed by contact between the movable contact piece and either fixed contact piece, and the tape runs from left to right or from right to left. A desired lamp (not shown) is turned on to indicate that the

Head support plate 3 rotated by cam plate 32
0 is an azimuth adjustment leaf spring 1 whose end is slightly bent upward as shown in FIGS. 8 and 9.
90, and the recording/playback head 2 is installed from above this leaf spring.
7 and 28 are attached (only the head 27 is shown to avoid complicating the figure).
Position it on the bent end of the
It is arranged by attaching it to the head support plate 30 at the head support plate 30. Here, one screw 193 is, for example, 2
By holding two washers 195 to set the mounting level and adjusting the threaded state of the other screw 194, the head is prevented from tilting or shifting.
With this simple structure using a single leaf spring with both ends bent, the azimuth adjustment of the head can be easily and reliably performed over a wide range. The head support plate 30 is fixed to the chassis 1 with screws 196.
4 and is rotatable around a screw 196. A pair of eccentric pins 197 and 198 are arranged equidistantly on both sides of the rotation center 196 to adjust the protrusion position of the protrusion head when the head support plate 30 rotates.
As shown in FIGS. 10 and 11, the eccentric pin 1
98 takes the form of a screw having a slot on the top surface and a thread at the bottom end, and the slot surface and the threaded bottom end are formed coaxially. and an annular groove 199 having a circumferential surface that abuts the side surface of the head support plate 30.
is formed in the center, and the center line of this annular groove is eccentric by e with respect to the center line of the eccentric pin. As mentioned above, the eccentric pin 198 is attached to the annular groove 199 with respect to the male threaded lower end which is attached to the fixed chassis 14.
Since the pin is relatively eccentric, rotating the slotted surface changes the eccentric position of the contact peripheral surface with the head support plate 30 within a large range, even though the position of the eccentric pin itself remains unchanged. be able to. Therefore, the protruding position of the recording/reproducing head can be adjusted sufficiently and reliably over a wide range without increasing the space occupied by the eccentric pin 198. The head support plate 30 in the annular groove 199 also has an eccentric pin 198 relative to the fixed chassis 14.
Its height is regulated by the screwing condition of the
The mounting level of the recording/reproducing head on the head support plate can be adjusted by the annular groove of the eccentric pin, and the head support plate itself can be prevented from tilting. It goes without saying that the other eccentric pin 197 also has the same shape as the eccentric pin 198.

As can be clearly seen from Fig. 8, the head support plate 3
0 is 2 where the implant pin 139 of the cam plate 32 is fitted.
It is integrally provided with a crotch-like projecting piece 200 and further provided with lever-like projecting pieces 202 and 203 on both sides of the rotation center. These lever-shaped protruding pieces 202,
Reference numeral 203 serves as an operating lever for the head circuit changeover switch 48 or the motor polarity changeover switch 50. The motor polarity changeover switch 50 will be explained with reference to FIGS. 12 and 13. The motor polarity changeover switch 50 includes a movable contact piece 204 and a pair of fixed contact pieces 206 and 207. The movable contact piece 204 has a characteristic that when the recording/reproducing head 27 is in a protruding state, it does not come into contact with the lever-like projecting piece 203 but comes into contact with one of the fixed contact pieces 207 due to its inherent elasticity. When the head support plate 30 is rotated clockwise in FIG. 8 in order to project the recording/playback head 28, the movable contact piece 204 is brought into contact with the other fixed contact piece 206 by the projecting piece 203. be forced to move. Further, the head circuit changeover switch 48 has similar characteristics and operates in a similar manner. In the embodiment, the head circuit changeover switch 48, the motor polarity changeover switch 50, and the tape running direction indicating switch 52 are each arranged separately, but a single switch is used to change the head circuit, change the motor polarity, and A configuration may also be used in which the tape running direction is instructed. The electric circuit of the motor polarity changeover switch 50 preferably uses a motor servo circuit to rotate the motor forward or reverse, as shown in FIG. Further, in order to prevent damage to the motor during reversal, it is preferable to start the motor after a certain period of delay.

As shown in FIG. 6, the pinch roller support plate 40
A tape fast forward/rewind lever 42 having an implanted pin 122 at one end that can come into contact with a notch 123 is rotatable to a rotating pin 210 on the fixed chassis 14.
It is attached using an E-ring. The fast-forward/rewind lever 42 has a lever piece 212 bent downward at right angles at the tip, and the triangular hole 21
4 and a long groove 216. The lever piece 212 protrudes outward from a case 218 that houses the fixed chassis 14 and the movable chassis 16, and can be operated from the outside. A pin 224 is located in the triangular hole 214 and is implanted in the free end of a connecting plate 222 that is rotatably attached to the fixed chassis 14 by a pivot pin 220 . Then, one end of the torsion coil spring 226 wound around the rotation pin 220 comes into contact with the planting pin 220 protruding from the triangular hole 214, and the planting pin 220 is inserted into the triangular hole 214.
4 and maintains the fast forward/rewind lever 42 at a neutral position. When the lever piece 212 is rotated in the direction A or B shown in the figure, the planted pin 220 is inserted into the corner 22 of the triangular hole 214.
8,229. On the other hand, long groove 2
A movable contact piece 232 of a motor rapid-forward switch 230 is fitted within the motor fast-forward switch 230 . In the illustrated neutral state, the movable contact piece 232 is connected to the fixed contact pieces 233, 23.
It is not in contact with any of 4.

The operation of switching the protruding heads by rotating the head support plate 30 will be explained below. Assume that the recording/reproducing head 27 protrudes and the tape is running in the forward direction. When the motor 24 is reversed, either manually if necessary or automatically by end detection, the magnetically sensitive element 100 senses the pulse fluctuations of the magnetic ring 68 and, as shown in FIG. 5, the signal processing circuit 102,
Logic circuit 104 and plunger drive circuit 106 cause plunger 110 to move inward by a predetermined distance against the biasing force of tension spring 131. As shown in FIG. 7, when the recording/reproducing head 27 is in a protruding state, the planting pin 130 of the connecting piece 114 is biased toward the corner 133 as described above, and the planting pin 130 is biased toward the corner 133.
The V-shaped piece 137 of the cam groove 132 is located below the imaginary line connecting the center of rotation 144 of the cam plate.
Therefore, as the plunger 110 moves inward, the planting pin 130 of the connecting plate 114, which moves integrally with the plunger, moves within the right groove 135.
Press the end of 35 to move the cam plate 32 to the rotation center 14
Rotate counterclockwise around 4. When the cam plate 32 rotates, the movable contact piece 149 is pressed against the other fixed contact piece 151 by the bifurcated projection piece 148, indicating that the tape will run in the reverse direction, that is, from right to left. The lamp is turned on. At the same time as the cam plate 32 rotates, the planted pin 139 of the cam plate 32
The head support plate 30 rotates around the rotation center 196 by the engagement of the bifurcated protruding piece 200 with the eccentric pin 19.
7, the recording/reproducing head 28 is projected.

This eccentric pin 197 has the same structure as the eccentric pin 198, and can adjust the protruding position and mounting level of the recording/reproducing head 28. As can be seen from FIG. 8, the clockwise rotation of the head support plate 30 causes the projecting pieces 202, 203 to press the movable contacts of the switches 48, 50, and against the characteristics of the movable contacts, move the protruding pieces 202, 203 to the other fixed contacts. contact each other. By the switching operation of the switches 48 and 50, the recording/playback head 2
A head circuit for 8 is formed and the polarity of the motor is switched.

After the recording/reproducing head 28 protrudes, the tension spring 131 is moved so that the planting pin 130 of the connecting plate 114 comes into contact with the lower corner 134, as shown in FIG.
(See Figure 7).
Together with the connecting plate 114, the plunger 110 is also returned to its protruding position by the biasing force of the tension spring 131. Here, the planting pin 130 and the cam plate 3
The V-shaped piece 137 of the cam groove 132 is located above the imaginary line connecting the rotation center 144 of the cam groove 132. Therefore, when the plunger 110 moves inward again against the biasing force of the tension spring 131, the planting pin 130 moves within the left groove 136 and presses the end thereof, thereby moving the cam plate 32 clockwise. At the same time, the head support plate 30 is rotated until it comes into contact with the eccentric pin 198, and the state in which the recording/reproducing head 27 protrudes as shown in FIG. 8 is set again. and connecting plate 1
14 is set to the state shown in FIG. To run the tape at high speed during forward and reverse running, move the fast forward/rewind lever 42 to the center of rotation 2.
This is done by rotating it around 10 degrees.
For example, in FIG. 6, rewinding is performed by rotating the lever piece 212 of the fast forward/rewind lever 42 in the A direction. Lever piece 212
When rotated, the implant pin 224 moves from the neutral position where it is pressed against the apex 227 to the fast forward and rewind positions where it is pressed against the corners 228 and 229. For example, for rewinding, as shown in FIG.
12 in direction A, the implant pin 122 of the fast forward/rewind lever 42 engages and presses the notch 123, and moves clockwise along the left part of the notch to pinch. The roller support plate 40 also rotates clockwise around the rotation center 121, and the pinch roller 38 separates from the capstan 36. The lower bent piece 128 or 129 at the end to which the pinch roller 38 is attached is always located very adjacent to a part of the head support plate 30 even when either of the recording/reproducing heads 27, 28 is in a protruding state. ing. The bent pieces 128 and 129 are both located at the same level as the head support plate 30 or at a lower level. Therefore, the recording head 27 is located at the protruding 16th
In the figure, when the pinch roller support plate 40 is moved backward by the rotation of the lever piece 212, the head support plate 30 is rotated slightly clockwise around the rotation center 196 (see FIG. 8) by the bending piece 129. rotate in the direction.
Therefore, the protruding recording head 27 is slightly retracted, and since there is no contact between the tape and the protruding head, fast forwarding and rewinding of the tape can be performed without any problem. After rotating the fast-forward/rewind lever 42 in the direction A, the positions of the fast-forward/rewind lever 42, the head support plate 30, and the pinch roller support plate 40 are set to the first position.
It is shown in Fig. 6 by an imaginary line (dotted chain line). In this state, the implant pin 224 is pressed against the corner 229 by the biasing force of the torsion spring 188. For example, if the fast forward/rewind lever 42 is rotated in the direction B in FIG. 15 where the recording/reproducing head 28 is protruding,
The planting pin 122 presses against the notch 123 and rotates counterclockwise along the right portion of the notch. Then, the head support plate 30 is rotated slightly counterclockwise around the rotation center 196 by the lower bent piece 128, thereby retracting the recording/reproducing head 28. In this case as well, unwinding occurs, but the implant pin 224 is pressed against the corner 228. Here, since the rotating direction of the lever piece 212 coincides with the high-speed running direction of the tape, the recording/reproducing head 27
If the lever protrudes, rotating the lever piece in the A direction will rewind the film, and rotating the lever piece in the B direction will fast forward the film. Conversely, if the recording/reproducing head 28 protrudes, rotation of the lever piece 212 in the A direction causes fast forwarding, and rotation in the B direction causes rewinding.

Further, in FIG. 16, if the state in which the lever piece 212 is rotated in the B direction for fast forwarding is shown by an imaginary line (two-dot chain line), as can be seen from the figure, the pinch roller support plate 40 moves the lever piece 212 in the A direction. It is rotating clockwise in the same way as when rotating in the direction. Here, the planting pin 122 engages and presses the notch 123 and is moving counterclockwise along the right portion of the notch. In addition, the planting pin 224 is located at the corner 22
It is pressed to 8.

As described above, when the fast forward/rewind lever 42 is rotated in either direction, the planting pin 122 disposed at one end thereof engages with the notch 123 of the pinch roller support plate 40 and the pinch roller 38 is rotated. make them retreat. The biasing force of the torsion spring 188 acting on the pinch roller support plate 40 causes the pinch roller support plate 4 to
Since the fast-forward/rewind lever is fixed in its engaged position by the transmission from the pin 122 from the fast-forward/rewind lever, even if the operator releases his/her hand from the fast-forward/rewind lever, the fast-forward/rewind lever is maintained at the engaged position. A return lock is obtained.

Furthermore, when the plunger 110 moves inward,
The pin 116 of the plunger is the plunger arm 11
8 and presses the end of the long groove to rotate the plunger arm counterclockwise around its rotation center 240.

Due to the engagement between the bifurcated free end of the plunger arm 118 and the planted pin 126 of the pinch roller support plate 40, the pinch roller support plate 40 is rotated clockwise against the biasing force of the torsion spring 188. Here, the fast forward/rewind lever 42 is operated by a torsion spring 226.
A biasing force is constantly applied to press the implant pin 224 to the neutral position, that is, to the apex 227 of the triangular hole. Then, when the pinch roller support plate 40 rotates clockwise, the planting pin 122 and the notch 123
Since the engagement with the support plate 40 is released, the fast forward/rewind lever 42 is rotated at the same time as the support plate 40 is rotated clockwise, and the planting pin 224 is set at the neutral position where it is pressed against the apex 227. . Therefore, the fast-forwarding and rewinding states of the tape can be canceled simultaneously with switching the polarity of the motor.

As shown in FIG. 17, the locking mechanism 20 of the movable chassis 16 includes a locking lever 242 reciprocatably attached to the fixed chassis 14 and a locking cam 244 rotatably attached to the fixed chassis. We are prepared. The locking lever 242 has a pair of elongated holes 245, 246 extending laterally, and guide pins 247, 248 fixed to a pair of bent pieces extending downward from the side surface of the fixed chassis 14 are attached to the guide pins 247, 248 using an E-ring. It is removably loosely fitted into the elongated hole. Then, the fixed chassis 14 and the locking lever 242
These guide pins 247, 248 are pushed into the elongated hole 2 by the biasing force of a tension spring 249 stretched between the
It is pressed to the right end of 45,246. Further, a locking pin 250 is installed on the side surface of the locking lever 242. The inner end of the locking lever 242 forms a cam surface 251. Reference numeral 252 in Fig. 16
indicates a push button attached to the outer end of the locking lever 242. On the other hand, the locking cam 24
Reference numeral 4 denotes a torsion coil spring 2 which is rotatably attached to a bent piece extending upward from the side surface of the fixed chassis 14 using a rotary pin 254 and wound around the rotary pin.
56, it is subjected to a biasing force in a counterclockwise direction in FIG. This locking cam 244 has a pair of cam surfaces 257, 258, three locking grooves 259,
260, 261. In addition, the movable chassis 16 is in the raised position in the locking groove 2 of the cam plate.
The locking pin 264 locked in the locking cam 2
44, and a rotatable guide roller 266 on the other side facing the locking lever 242. This guide roller 26
6 is loosely fitted around the outer periphery of the implant pin 268. The movable chassis 16 is biased upward by a tension spring 270 stretched between a bent piece extending upward from the side surface of the fixed chassis 14. This tension spring 270 is similarly arranged symmetrically on the other side as shown in FIG.

In order to lower the movable chassis 16, when the push button 250 is pressed, the locking lever 242
are guided by the guide pins 247, 248 and pressed against the biasing force of the tension spring 249 until the left ends of the guide pin elongated holes 245, 246 come into contact. At the initial stage of the pressing stroke of the locking lever 242, the locking pin 250 of the locking lever moves along the outer surface of the cam surface 257 of the locking cam 244, so that the locking cam is affected by the biasing force of the torsion spring 256. It rotates clockwise around the rotation center 254 against the resistance. This clockwise rotation of the locking cam 244 causes the locking pin 264 of the movable chassis 16 to disengage from the locking groove 260 of the locking cam. At the same time, the cam surface 251 of the locking lever 242
The tension spring 27 is in contact with the guide roller 266 of 6.
The movable chassis is rotated at the center of rotation 12 against a biasing force of 0.
The locking pin 264 moves to a position facing the cam surface 258 in order to be pressed counterclockwise around the cam surface 258, that is, in a downward direction (see FIG. 18). Thereafter, as the pressing stroke of the locking lever 242 further advances, the guide roller 266 moves further downward along the cam surface 251 of the locking lever 242 against the biasing force of the tension spring 270, and at the same time the locking pin of the movable chassis 16 264 moves along cam surface 258. At the end of the pressing stroke, the locking pin 264 is housed and locked in the locking groove 261 to sufficiently charge the biasing force of the tension spring 270, and the movable chassis 16 is set to the lowered position as shown in FIG. Ru. At the end of the pressing stroke, the guide pins 247, 24
8 is defined by contacting the left ends of the elongated holes 245 and 247. Further, at the end of the pressing stroke, the locking pin 250 is housed and locked in the locking groove 259, and the biasing force of the tension spring 249 is sufficiently charged.

In FIG. 19 with movable chassis 16 in the lowered position, release lever 278 is rotatably mounted on fixed chassis 14 by pivot pin 276.
When the cassette is inserted and rotated, the movable chassis moves upward. That is, when the cassette is inserted, the cassette comes into contact with and presses the upper bent piece 280 formed at one end of the release lever 278.
By pressing the cassette against the bent piece 280, a clockwise rotational force is generated on the release lever 278. Here, the other end of the release lever 278 is disposed adjacent to the side surface of the locking cam at a position sufficiently apart from the rotation center 254 of the locking cam 244, and the bent piece 2
Since the cassette 80 itself is sufficiently spaced from the rotation center 276, even if the pushing force of the cassette against the bent piece 280 is small, a large rotational torque is generated on the locking cam 244. Therefore, the cassette is released from release lever 2.
By slightly pressing 78, the locking cam 244 immediately rotates in the clockwise direction shown in the figure, thereby causing the locking pin 264 of the movable chassis 16 to move into the locking groove 26.
1 is released from the locked state. Locking pin 264
When the locking lever 24 is released from the locking groove 261, the locking lever 24
The locking pin 264 moves along the cam surface 258 by the biasing force of the tension spring 270 charged during the second pressing stroke, rotates the locking cam 244, and is locked in another locking groove 260. Ru. As the locking pin 264 moves, the movable chassis 16 rises, and when the locking pin 264 is locked in the locking groove 260, the upward stroke is completed. Here, the tension spring 249 disposed between the locking lever 242 and the fixed chassis 14 is sufficiently charged during the pressing stroke of the locking lever, like the tension spring 270, so that the locking cam 244 is A force that tends to rotate clockwise is acting on the cam surface 257 from the locking pin 250. Therefore, the locking pin 264
is released from the locking groove 261, and at the same time the tension spring 2
A tension spring 270 which also acts on the locking pin 264 by a biasing force transmitted through the locking pin 250 by the
The locking cam 244 is rotated with the biasing force of
It is returned to the position from which it left. The locking lever 242 is also returned to its protruding position by the biasing force of the fully charged tension spring 249.

In the locking mechanism 20 described above, the locking lever 24
Since the biasing force is charged in the second pressing stroke and the charged biasing force is used to move the movable chassis 16 upward, the pressing force when inserting the cassette may be a small value. Therefore, there is no need to apply a large pushing force to the cassette, and even a cassette with inferior strength, such as a microcassette, can be raised without breaking or being damaged. In addition, two locking grooves 260,
261 is formed in a single locking cam 244, and locking is performed when the movable chassis 16 is raised and lowered by engagement of this locking groove and the locking pin 264, so that the locking mechanism 20 is simplified. It can be made smaller and
Locking with excellent vibration resistance is possible. Also, when the movable chassis 16 is raised, the locking groove 260 and the locking pin 26
Since the movable chassis is locked by engagement with 4, it is possible to use a tension spring 270 with a small spring constant. Since the movable chassis is locked by the engagement between the locking groove 260 and the locking pin 264, even if the tension spring 270 with a small spring constant is used, sufficient charge will not be achieved when the movable chassis is lowered. Needless to say. When the recording/reproducing head 27 is in the protruding state, the protruding piece 203 of the head support plate 30 is not located above the locking lever 242, as shown in FIG. Therefore, the locking lever 242
does not come into contact with the protruding piece 203 even if it is pressed. On the other hand, when the head support plate 30 rotates clockwise and the recording/playback head 28 protrudes, the protruding piece 203 extends laterally beyond the locking lever 242, as shown in FIG. . And this protruding piece 203
As shown in FIG. 17, is located adjacent to the side of the stepped portion 282 of the locking lever 242. Therefore, if the locking lever 242 is pressed to eject the cassette with the recording/playback head 28 protruding, the stepped portion 282 of the locking lever 242 will move against the protruding piece 2.
03 to rotate the head support plate 30 counterclockwise and cause another recording/reproducing head 27 to protrude. When the locking lever 242 is pressed to eject the cassette as described above, if the recording/playing head 27 is protruding, it will remain as it is, and if the recording/playing head 28 is protruding, the head support plate 30 will be moved.
Since the recording/playing head 27 protrudes due to the rotation of the cassette, the recording/playing head 27 is always
A prominent state of . Therefore, when the cassette is reinserted as necessary, the recording/playback head 27 can always be used for recording and playback.

As shown in FIGS. 1 and 20, the tape recorder 10 includes an erasing head switching mechanism 46 for protruding the erasing head 44 during recording and retracting it during playback. The tape recorder 10 can be incorporated, for example, as part of a car stereo system, and the erasing head switching mechanism 46 includes an erasing head switching push lever 290 that operates an amplifier switch (not shown). As can be clearly seen from FIG. 20, this push lever 290 has long holes 292 and 293 on the top and side surfaces.
and fixed chassis planting pins 295, 296.
are loosely fitted into these long holes using E-rings. A bent piece 297 is bent upward on the side of the push lever 290, and a bent piece 29 is bent upward on the side of the fixed chassis 14.
Due to the biasing force of the tension coil spring 300 stretched between the pins 295 and 296, the pins 295 and 296
It is pressed to the left end of 92,293. The erasing head 44 is mounted on a head mounting plate 304 with two screws 302 and 303, and this head mounting plate is attached to the fixed chassis 14 with a pivot pin 306.
It is rotatably mounted on the Then, one end of the torsion coil spring 308 wound around the rotation pin 306 comes into contact with this screw 303, and the head mounting plate 30
4 is subjected to a clockwise biasing force. The screw 303 is pressed against the bent piece 311 of the bushing lever 290. Here, since the biasing force of the tension spring 300 is larger than the biasing force of the torsion spring 308, the head mounting plate 304 is rotated counterclockwise when the movable chassis 16 is lowered, as shown in FIG. It is placed in a backward position. Also, the locking pin 310 is connected to the push lever 290.
Two notches 312 and 313 that can be engaged with the locking pin are formed at the upper end of the side surface of the movable chassis 16. Of these notches, the notch 312 is formed at a position where the locking pin 310 engages when the movable chassis 16 is raised without pressing the push lever 290. The other notch 313 is the elongated hole 29
When the push lever 290 is pressed against the biasing force of the tension spring 300 until the implant pins 295 and 296 come into contact with the right end of the pins 2 and 293, and the movable chassis 16 is raised, the locking pin 310 engages. It is formed in a position where

As described above, the locking pin 310 and the notch 312,
313, the cassette is inserted without pressing the push button 290, the locking mechanism 20 is released, and the tension spring 27 is released.
When the movable chassis 16 is raised with a biasing force of 0, the locking pin 310 is engaged in the notch 312. In this state, the mounting plate 304 of the erasing head is rotated counterclockwise by the biasing force of the tension spring 300, and the erasing head 44 is in a retreated position and cannot contact the tape. Therefore, the recording mode cannot be set, but only the playback mode can be set. In such a state, even if you try to press the push lever 290 by mistake, you will not be able to press it because the locking pin 310 of the push lever is locked in the notch 312, thus completely preventing erasure of the tape due to malfunction during playback. be done. In this way, under normal conditions, only playback can be performed, and recording cannot be performed unless the push lever 290 is pressed to cause the erase head 44 to protrude and come into contact with the tape. To set the recording mode, move the push lever 290 a predetermined distance, that is, the implant pins 295 and 296
2,293 until it abuts the right end of the tension spring 30.
Press against a biasing force of 0. If the cassette is inserted while the push lever 290 is pressed and the movable chassis 16 is raised, the 21st
As shown in the figure, a locking pin 310 is engaged with a notch 313 in the movable chassis. If the push lever 290 is pressed and moved back, the bending piece 311 of the push lever will also move back together, so the biasing force of the torsion spring 308 will effectively act to move the head mounting plate 304 around the center of rotation 306. The erasing head 44 is rotated clockwise so that the erasing head 44 is set at a predetermined protruding position and comes into contact with the tape surface, thereby enabling erasing. The clockwise rotation angle of the head mounting plate 304, which sets the protruding position of the erasing head 44, is regulated by a bent stopper piece 314 (see FIG. 1) extending upward from the fixed chassis 14. This stopper piece 314 is the torsion spring 3
It also acts as a member with which the other end of 08 comes into contact. When recording has already been made on one tape side and recording is required on the other tape side, the recorded music, etc. will be erased by auto-reverse once recording on the required tape side is completed. There is a risk of it being damaged. In order to avoid such dangers, the 20th,
As shown in FIG. 21, it is preferable to dispose a normally closed switch 315 in the plunger drive circuit 106, which turns off when the push lever 290 is pressed. This switch 315 is push lever 2
In the recording mode in which 90 is pressed, the plunger drive circuit 106 is opened and auto-reverse is disabled, so erasure of recorded music etc. is completely prevented.

Normally, in a cassette, side A can be accurately reproduced, but side 2 cannot be accurately reproduced. Therefore, in the example, A
Recording in the forward direction is only possible when the cassette is inserted with the side facing up.
You can record with clear sound quality. Here, it is preferable to disable the program switch in the recording mode. Therefore, for example, a program switch can be attached to the push lever 290, and a program button that can come into contact with the program switch can be attached to the fixed chassis 14. Here, in the playback mode, the push lever 290 protrudes outward, and in the recording mode, it is pressed inward.Using this relationship, the program button is fixed so that it can come into contact with the program switch on the push lever only in the playback mode. It is arranged on the chassis 14. That is, the program switch is attached to the push lever so that it moves together with the push lever 290 to a position outside the pressing stroke range of the program button in the recording mode. If arranged like this, the push lever 29
When 0 is pressed, the program button does not press the program switch and the program switch does not operate, so programming in the recording mode (manual reverse) can be completely prevented.

Furthermore, since recording is performed only during forward travel, it goes without saying that the head 28 may be a playback-only head instead of a recording/playback head. Fast forwarding and rewinding of the tape is necessary during playback, but not during recording. Therefore, a stopper plate 316 that prevents the tape fast-forward/rewind lever 42 from rotating during recording is disposed on the fixed chassis 14 adjacent to the tape fast-forward/rewind lever 42, as shown in FIG. ing. As can be clearly seen from FIG. 22, the stopper plate 316 is
Stepped planting pins 318, 31 on fixed chassis 14
It has elongated holes 320, 321 into which the small diameter portions of No. 9 are loosely fitted. An E-ring is attached to the small diameter portion of the implant pin. Further, the stopper plate 316 has a cam groove 326 at one end into which a guide pin 324 installed on the push lever 290 for switching the erase head is loosely fitted. In addition to the stopper plate 316, there is a stopper piece 328 extending adjacent to the pin 224 that defines the rotation of the fast forward/rewind lever 42. In the regeneration mode in which the push lever 290 is not pressed, the stopper plate 316 is maintained in the state shown in FIG. 22 by the engagement between the guide pin 324 of the push lever 290 and the cam groove 326. Here, the stopper piece 328 is separated from the pin 224. However, in the recording mode in which the push lever 290 is pressed to protrude the erasing head 44 to the position where it contacts the tape, the guide pin 3
Stopper plate 316 to enable movement of 24.
is moved upwards in FIG. That is, as the guide pin 324 moves within the cam hole 326, the stopper plate 316 receives an upward force, is guided by the implant pins 318 and 319, moves upward, and is set to the position shown in FIG. . This upward movement distance is determined in consideration of the shape of the cam hole 326 so that the stopper piece 328 moves across the front of the pin 224. In this way, in conjunction with the pressing of the push lever 290, the stopper piece 328 of the stopper plate projects forward of the pin 224 and is positioned on the rotation path of the pin 224, so even if the lever piece 212 is rotated in either direction, Even if an attempt is made, the pin 224 comes into contact with the stopper piece 328 and the lever piece cannot be rotated. Therefore, fast forwarding or rewinding due to malfunction during recording is completely prevented.

In FIG. 1 and FIGS. 22 to 24, reference numeral 332 indicates a movable positioning pin for accurately arranging the inserted cut at a predetermined position together with positioning pins 333 and 334. This movable positioning pin 332 is attached to a rotatable support plate 336 on the fixed chassis 14,
It is biased inwardly by a torsion coil spring 340 wrapped around a stud pin 338 on the stationary chassis. Reference numeral 342 indicates a planted pin against which the other end of the torsion spring 340 abuts.
The movable positioning pin 332 has a double conical column shape that can press the cassette inward when it is fitted into the guide hole of the cassette, and can further press the cassette inward even after it is fully fitted into the guide hole. ing. Also, the positioning pin 3 on the fixed chassis 14
33 and 334 also have a similar biconical shape.

A main switch 344 for a printed circuit board (not shown) disposed on the fixed chassis 14 is
As shown in Figures 25 and 26, it extends below the fixed chassis (in the figure it extends above).
It is attached to the side surface of the bending piece 346. This main switch 344 has a fixed contact piece 347 and a movable contact piece 348, and the movable contact piece has a characteristic that it separates from the fixed contact piece in a normal state. The movable chassis 16 has a bent piece 350 extending inward, and when the movable chassis is lowered, the movable contact piece 3 is attached to this bent piece.
48 does not abut, and the movable contact piece 348 is separated from the fixed contact piece 347 due to its characteristics. When the movable chassis 16 rises, the movable contact piece 348 is moved by the bending piece 350 so as to come into contact with the fixed contact piece 347. Therefore, when the movable chassis 16 is raised by insertion of the cassette, an electric circuit is formed on the printed circuit board and the motor rotates to run the tape in the forward direction.

Figure 27 shows fixed chassis 14 and movable chassis 1.
The case 218 is shown in which cassettes such as No. 6 are housed, and the cassette is inserted through the cassette insertion port 356.
A large number of openings are formed on the front surface of the case 218, and reference numerals 358, 360, and 362 indicate openings for the push button 252 of the locking lever 242, the lever piece 212 of the fast forward/rewind lever 42, and the push button of the push lever 290, respectively. It shows. Further, triangular windows 364 and 366 indicate lighting display windows for lamps indicating the tape feeding direction. Furthermore, reference numeral 368 designates an opening for a program button (none of which is shown) for a program switch that reverses the motor 24 as needed, regardless of detection of the end of the tape.

The case 218 is a pair of half cases 372,3
74, and the upper half case 372
As shown in FIG. 28, a pair of guide pieces 376 and 37 serve as cassette guides when inserting the cassette.
It has 7. These guide pieces 376, 37
7 has a pair of fitting holes, and pins 378 to 381 embedded in the half case 372 are inserted into these holes.
are attached to the half case 372 by being fitted together. As shown, the guide piece 376,
377 has bent pieces 383, 384 bent laterally, and guides the lateral position of the cassette by side surfaces 386, 387 of the guide pieces, and upper surfaces 388, 389 of the bent pieces (in the figure, the side faces downwards). are doing)
guides the lower position of the cassette.
The biasing force of a torsion coil spring of a hinged insertion port cover (not shown), which is rotated upward when the cassette is inserted, applies a biasing force to the cassette from above to guide the cassette in its upper position. Although the cassette guide using the guide pieces 376, 377 and the insertion port cover is rough, it can sufficiently guide the cassette almost to a predetermined position. Accurate positioning is achieved by fixed positioning pins 333, 334 and a movable positioning pin 332 in the shape of a biconical column.
The rough guide mechanism that guides the cassette almost to a predetermined position is formed by the guide pieces 376, 377 of the case 218 and the insertion port cover as described above, and is connected to the movable chassis 16 or the fixed chassis 1.
Since the members above 4 are not used at all, the desired guiding can be performed with a small number of members without complicating the structure of the tape recorder itself.

FIG. 29 shows a block diagram when the fast-forward switch and program switch are activated. When the fast-forward switch is activated, the head signal in the logic circuit 104 is cut off and the motor is rotated forward at high speed. When the program switch is activated, the head signal in the logic circuit 104 is cut off to reverse the motor at high speed, and when the program switch is released, the plunger is activated again to rotate the motor in the forward direction. Also, Fig. 30 shows a switch 315 that disables auto-reverse in recording mode.
The block diagram is shown.

As described above, according to the tape recorder of the present invention, the pinch roller support plate is rotatably provided to support the pinch roller, and the spring member that biases the pinch roller support plate to rotate in the capstan direction. When the fast forward mode or rewind mode is set, the engaging portion engages with the pinch roller support plate, causing the pinch roller support plate to rotate against the biasing force of the spring member, and It is equipped with a fast forward/rewind lever that locks in the engaged state.

Therefore, in this invention, the fast forwarding and rewinding locks do not require an increase in the number of parts, and the rotational movement of the fast forwarding/rewinding lever can be used to perform simple fast forwarding and rewinding.
The rewind lock can be secured, and even if the operator removes his or her finger from the fast-forward/rewind lever, fast-forward or rewind is maintained.

[Brief explanation of the drawing]

The drawings show an embodiment of the tape recorder according to the present invention, in which Fig. 1 is a plan view with the case removed, Fig. 2 is an exploded perspective view of the reel stand, and Fig. 3 shows the assembled state of the reel stand. 4 is a schematic explanatory diagram showing the relationship between the power transmission mechanism and the one-way latch means, FIG. 5 is a block diagram showing the function of the magnetic sensing element, and FIG. 6 is a diagram showing the plunger, cam plate, and pinch roller. FIG. 7 is a plan view showing the operation of the cam plate; FIG. 8 is a plan view showing the operation of the head support plate; FIG. 9 is a plan view showing the operation of the head support plate; Lines in Figure 8
Partial front view of the head support plate seen from the direction, No. 10
The figure is a plan view showing the relationship between the eccentric pin and the head support plate, Figure 11 is a sectional view taken along line XI-XI in Figure 10, and Figure 12 is a diagram showing the relationship between the head support plate and the motor polarity changeover switch. Plan view, Figure 13 is the 12th
14 is a block diagram showing the function of the motor polarity changeover switch 50, and FIG. 15 shows the plunger, cam plate, pinch roller support plate, fast-forward/rewind lever after head switching, Plan view showing the relationship between the head support plates, 1st
Figure 6 is a plan view showing the state of the pinch roller support plate and head support plate when the fast forward/rewind lever is activated, and Figure 17 is a side view of the locking mechanism before the locking lever is pressed, with the movable chassis in the raised position. It is in. 1st
FIG. 8 is a side view of the locking mechanism while the locking lever is pressed, and FIG. 19 is a perspective view of the locking mechanism after the locking lever is pressed, with the movable chassis in the lowered position. Second
Figure 0 is a perspective view of the erase head before pressing the push lever, Figure 21 is a perspective view of the erase head with the push lever set to record mode, and Figure 22 is a plan view of the stopper plate before the push lever is pressed. 23 is a plan view of the stopper plate after the push lever is pressed, FIG. 24 is a front view showing the positioning of the cassette by the positioning pins 332, 333, and 334, and FIG. 25 is the connection between the main switch of the electric circuit and the movable chassis. 26 is a side view seen from the line direction of FIG. 25, FIG. 27 is a perspective view of the case, FIG. 28 is a perspective view showing the inner surface of the upper half of the case, and FIG. 29 is a bottom view showing the relationship. The figure is a block diagram showing the functions of a fast forward switch and a program switch, and FIG. 30 is a block diagram showing a switch that disables auto-reverse during recording. 10...Cassette tape recorder, 14...Fixed chassis, 16...Movable chassis, 18...Cassette, 22...Reel mechanism, 24...Motor,
27, 28... Recording/playback head, 30... Head support plate, 32... Cam plate, 34... Plunger mechanism,
36...capstan, 38...pinch roller,
40...Pinch roller support plate, 42...Fast feed/
Rewind lever, 44...Erasing head, 46...Erasing head switching mechanism.

Claims (1)

[Claims] 1. A pinch roller support plate that supports the pinch roller and is rotatably provided; a spring member that biases the pinch roller support plate to rotate in the capstan direction; A fast forward/rewind lever whose engaging portion engages with the pinch roller support plate, rotates the pinch roller support plate against the biasing force of the spring member, and is locked in the engaged state. A tape recorder characterized by: