JPS5927022B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording and reproducing device that pulls out a magnetic tape from a cassette and runs it. In particular, when pulling out and storing a magnetic tape, the braking force of one reel stand is released and the tape is played back. This relates to a mechanism that releases the braking force of both reel stands during operation or fast-forwarding.

Conventionally, when independently releasing the braking force of both reel stands, an independent plunger or the like was required, making the device expensive.

The present invention provides a magnetic recording/reproducing device that solves this conventional problem.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording/reproducing apparatus (hereinafter referred to as a tape recorder) according to the present invention will be described below with reference to drawings of embodiments.

The cassette 2 used here includes a pair of reel hubs 6 and 8 for guiding the magnetic tape 4 along the front surface of the cassette and for winding the magnetic tape 4, as shown in FIG. A pair of U-shaped grooves 10 and 12 are formed on the front surface of the cassette, into which a member for drawing the magnetic tape 4 out of the cassette 2 can be inserted so as to be located on the back side of the magnetic tape 4. A pair of lids 14 and 16 attached to the cassette are constantly biased by a spring (not shown) to rotate in a direction that defines the openings of the pair of U-shaped grooves 10 and 12. The pair of positioning holes 18 and 20 cooperate with a positioning member of the tape recorder to position the cassette 2 when the cassette 2 is installed in the tape recorder.

Next, a description will be given with reference to FIGS. 2 to 5.

A holder 32 is rotatably fitted into shafts 28 and 30, which are respectively set up in a pair of L-shaped metal fittings 24 and 26 fixed to the substrate 22. The holder 32 reciprocates between the position where the cassette 2 is attached/detached and the position where the cassette 2 is attached to the tape recorder, and is constantly biased by a spring (not shown) in the direction of the position where the cassette 2 is attached/detached. ing. Board 2
Positioning pins 34 and 3 are provided on both sides of the cassette 2 and are inserted into the positioning holes 18 and 20 of the cassette 2 to position the cassette 2 when the cassette 2 is installed in the tape recorder.
6 has been planted. The supply reel stand 38 and the take-up reel stand 40 (indicated by dashed lines) have shafts 42, which are set up on the substrate 22,
44, and when the cassette 2 is installed in a tape recorder, they engage with the pair of reel hubs 6, 8 of the cassette 2 and rotate as one unit. A capstan 46 is a first motor 4 attached to the bottom surface of the board 22.
The magnetic tape 4 rotates integrally with the main shaft 8, and transports the magnetic tape 4 at a constant speed in cooperation with a pinch roller, which will be described later, during recording or reproduction.
The pinch roller 50 is rotatably fitted loosely into a pinch roller shaft 56 which is mounted on a pinch roller lever 54 which is rotatably and loosely fitted onto a shaft 52 which is mounted on the substrate 22.

A first pin 58 and a second pin 60 are mounted on the pinch roller lever 54, and the second pin 60 extends downward through a square hole 62 formed in the base plate 22. The protrusion 64 attached to the pinch roller lever 54 is attached to the pinch roller lever 5.
4, the pinch roller 50 touches the capstan 46.
This is for opening the lid 16 of the cassette 2 when moving in the direction of. The crimp lever 66 is attached to the shaft 6 that is installed on the substrate 22.
It is rotatably fitted loosely into a shaft 72 which is mounted on a drawer lever 70 which is rotatably fitted loosely into the drawer lever 70. A guide roller 76 is freely rotatably fitted onto a shaft 74 that is mounted on the pressure lever 66. A pad 80 is attached to the protrusion 78 of the compression lever 66, and works in cooperation with a tape guide to be described later to apply tension by lightly pinching the magnetic tape during recording and reproduction. A protrusion 82 is attached to the tip of the drawer lever 70, and when the guide roller 76 moves in the direction of drawing out the magnetic tape 4 from the cassette 2 as the drawer lever 70 rotates, the lid 14 of the cassette 2 is opened. A tension spring 84 is hooked between the protrusion 82 and the crimp lever 66 and urges the crimp lever 66 clockwise in FIG. Since it comes into contact with the stopper 86, the state shown in FIG. 2 is maintained. The other end of the pull-out lever 70 is engaged with and disengaged from a first pin 58 that is mounted on the pinch roller lever 54. Third pin 88 planted on the drawer lever 70
extends below the substrate 22 through an elongated hole 90 formed in the substrate 22. The tension spring 92 is connected to the pinch roller lever in FIG.
The second pin 60 and the third
The square hole 62 and the elongated hole 90 that the pin 88 forms in the substrate 22
The state shown in Fig. 2 is maintained because it comes into contact with the end face of. A head board 106 holding an erasing head 94, a cue head 96, a recording head 98, a reproducing head 100, and a pair of tape guides 102, 104 is mounted on three supports 108 erected on the board 22. During fast-forwarding of the tape, a shift pin 110 for separating the magnetic tape 4 from each of the magnetic heads is guided by one of the three pillars 108 and a guide 112 and can freely slide in the directions of arrows A and B. It is planted on a sliding plate 114 disposed on.

Furthermore, a rotating arm 120 has a U-shaped hook 118 at its tip on a shaft 116 set on the sliding plate 114.
is rotatably fitted loosely, and receives a rotation biasing force in the counterclockwise direction in FIG. A wire spring 126 attached to the base plate 22 extends downward through a square hole 128 formed in the base plate 22 and comes into contact with a stepped portion of the main actuating plate, which will be described later. While the rotation is restricted, the sliding plate 114 is moved by the tension spring 12.
4 is locked at the upper end position as shown in Fig. 2,
The shift pin 110 is in a retracted position from each magnetic head. The latch release arm 130 is rotatably fitted loosely on a shaft 132 that is set on the base plate 22, and has a bent portion 13 at the tip.
4 and the substrate 22, the spring 136 is biased counterclockwise in FIG. The stepped portion 138 has an engaging relationship with a first cam portion of an eject push button, which will be described later. A pin 144 installed at the tip of the latch release arm 130 passes through one end of a lock plate 142 that is slidably disposed in the left-right direction in FIG. A protrusion 146 is formed at the other end. Eventually, the latch release arm 130 and the lock plate 142 are connected to the pin 14.
4, and the lock plate 142 receives a biasing force to the right in FIG. Maintain the state shown in Figure 2. Pin 144 is on board 2
2 through a square hole 148 formed in the substrate. The shaft 132 further has a square hole 150,1 formed in the substrate 22.
A first cam portion 154 extending downward through the substrate 52 and a second cam portion 154 extending downward through the substrate.
An eject push button 158 having a cam portion 156 and slidable in the axial direction is fitted therein, and receives an upward biasing force from a compression spring 160. A rod 164 connected to the holder 32 by a pin 162 has a cam 166 at the bottom and a notch 16 approximately in the center for locking the holder 32 in the operating position.
8, and passes through a square hole 170 formed in the substrate 22.
As shown in the figure, it extends below the substrate. A pair of shafts 172 and 174 mounted on the substrate 22 are provided with brake levers 180 and 18 having brake levers 176 and 178 circumscribing the supply reel stand 38 and the take-up reel stand 40 at their tips, respectively.
2 are rotatably fitted, and are pulled together by a tension spring 184 in a direction that applies a brake to each reel stand.
The brake levers 180, 182 further have inwardly extending protrusions 186, 188, and the protrusions 188 have a stepped portion 190 which is partially widened. A second motor 192 for selectively driving each reel stand is connected to the board 22.
The pulley 194 extends above the substrate through a hole 196 formed in the substrate 22, as shown in FIG.

An idler 202 having a rubber-lined large diameter portion 198 and a small diameter portion 200 is rotatably fitted loosely onto a first shaft 206 planted on a sliding plate 204 that is slidably disposed on a substrate. Due to the displacement of the sliding plate 204 in the direction of arrow B, the pulley 194 and the supply reel stand 38 or the take-up reel stand 4
It falls between 0 and 0. A braking member 212 is disposed on the sliding plate 204 so as to be able to slide while being guided by a second shaft 208 planted on the sliding plate 204 and a bent portion 210.
The braking member 212 receives a biasing force in the direction of arrow A by the ring spring 216 applied between the second shaft 208 and the bent portion 214 of the braking member 212, but the lower braking portion 218 Since it is in contact with the portion 200, the state shown in FIG. 2 remains as shown in FIG. 3. As shown in FIG. 5, a third shaft 220 installed at the bottom of the sliding plate 204 extends below the substrate through an elongated hole 222 formed in the substrate 22.
It engages with an elongated hole 226 formed in an idler drive rod 224 slidably disposed on the underside of the base plate 22. A pair of pins 228 installed in the idler and drive rod 224.
, 230 are guided through elongated holes 232, 234 formed in the substrate. A first bent portion 236 formed at the other end extends above the board through a square hole 238 formed in the board, and engages and disengages with the hook 118 of the rotating arm 120 described above. Said third
A tension spring 242 is hung between the shaft 220 of the idler drive rod 224 and the second bent portion 240 of the idler drive rod 224, and in the state shown in FIG. move in a targeted manner. The main actuating plate 244 is guided by guides 246 and 248 planted on the base plate 22 and is slidably arranged in the directions of arrows A and B.
0, a biasing force is applied in the direction of arrow B.

The bent portion 252 of the main operating plate 244 is connected to the first plunger 256 attached to the base plate 22 by the mounting plate 254 and the pin 2.
58. The first step 260 of the main operating plate 244 is connected to the second pin 60 of the pinch roller lever 54 described above, the second step 262 is connected to the wire spring 126 described above, and the protrusion 264 is connected to the third pin 88 of the drawer lever 70. They are in contact with each other. A U-shaped notch 266 formed in the main actuating plate 244 has a bending portion 268 that includes a rotating shaft 270 of a roller 270.
An auxiliary arm 274 is fitted on the main operating plate 244 so as to be rotatable and slidable, and a tension spring 278 is inserted between the guide pin 276 and the bent portion 268. However, when the first plunger 256 is not in operation, the roller 270 rests on the end surface of the square hole 280 provided in the substrate 22, as shown in FIG.
A pin 282 erected at the tip of the pinch roller lever 74 is configured to be locked at a position closer to the substrate than the pinch roller lever 54 . The auxiliary actuating plate 284 is a guide 28 that is installed on the base plate 22.
6 and 288 so as to be slidable in the directions of arrows A and B, and the first bent portion 290 is guided by the mounting plate 29
2, a second plunger 294 is attached to the substrate 22 by
and are connected by a pin 296. As shown in FIG. 5, the first plunger 256 and the second plunger 294 are approximately the same size, and are similar to the supply reel stand 38 and the take-up reel stand 40.
They are placed at symmetrical positions on the left and right with respect to the center line. A tension spring 300 is placed between the second bent portion 298 of the auxiliary actuating plate 284 and the base plate 22, and biases the auxiliary actuating plate 284 in the direction of arrow A.

Moreover, the shaft 302 and the shaft 30 are installed on the auxiliary operating plate 284.
A first arm 306 and a second arm 306 are rotatably attached to each arm 306.
An arm 308 is loosely fitted. A pin 310 is installed at the tip of the first arm 306, and a bow tension spring 312 is hung between the other end and the second arm 308, and receives a clockwise rotational force as shown in FIG. However, since the side surface is in contact with the third pin 88 of the pull-out lever 70, the state P in FIG. 5 is maintained. The second arm 308 is subjected to a counterclockwise rotational force in FIG. Keep the state as shown. Also, the side surface 316 of the second arm 308 is connected to the previously described unlatching arm 130.
The protrusion 318 is engaged with and disengaged from a pin 144 that is planted on the base plate and extends downward from the substrate, and the protrusion 318 is engaged with and disengaged from the cam 166 of the rod 164 described above. Guides 320, 3 planted on the substrate 22
The holder lock plate 324, which is guided by the guide 22 and slidably arranged in the directions of the arrows A and B, receives a biasing force in the direction of the arrow B by a tension spring 326 applied between the guide 322 and the holder 32. As shown in FIG. 4, the tip enters into a notch 168 of the rod 164 to restrict rotation of the holder 32 in the clockwise direction in FIG.

Bent portion 328 of holder lock plate 324 and second arm 3
A distal end projection 314 of No. 08 is engaged and disengaged. Also, the stepped portion 330 of the holder lock plate 324 and the eject button 158
When the eject button 158 is fully pushed toward the board side, the holder lock plate 324 is displaced in the direction of arrow A by the inclined surface of the second cam portion 156, and the tip and rod 164 are in an engaged/disengaged relationship. The configuration is such that engagement with the notch 168 is released. The lever 322 is rotatably and loosely fitted onto a shaft 334 mounted on the base plate 22, and has a stepped square hole 336 approximately in the center, into which the pin 310 of the first arm 306 described above is inserted. is inserted, and when the pull-out lever 70 is in the position shown in FIG. It is configured to do so.

A pin 338 is installed at the tip of the lever 332, and the pin 338 fits into a hole (not shown) provided in the idler drive rod 224 to move the idler drive rod 224 in the directions of arrows A and B. In addition, the board 22
It extends upward through the square hole 238 of the board and is configured to engage and disengage with the protrusions 186, 188 of the brake levers 180, 182 mentioned above, and is used for attaching and detaching the brake lever to the supply reel stand 38 and take-up reel stand 40. Take control. Next, the operation of the tape recorder having the above structure will be explained with reference to the timing chart shown in FIG. 12 and each drawing.

In the timing chart in Figure 12, the operating line of each element is LO.
Although the w position and the high position are written separately, the LOW position indicates a non-operating state, and the Taku position indicates an operating state.
In the section of the pinch roller lever (pull-out lever), there are two levels of the High position, but as will be described later, the operating positions are somewhat different, so they are written separately. Also, in the second motor section, Hi
There are two stages at the gh position, but as will be described later, there are two types of applied voltages, so low voltage operation and high voltage operation are distinguished. Also, the description of the first motor is omitted assuming that it continues to operate. In the mode section, since the operational states of the mechanical parts are the same in recording and reproducing operations, the section on recording operation is omitted. Furthermore, as will be described later, in the fast-forwarding operation and the rewinding operation, the rotation direction of the second motor is opposite to each other and the direction of transport of the magnetic tape is reversed, but the operating conditions of the other mechanical parts are the same, so the rewinding operation is performed. This section has been omitted. Loading operation: When the holder 32 into which the force set 2 is inserted is attached to the tape recorder, the positioning pins 34 and 36 enter the positioning holes 18 and 20 of the force set 2, as shown in FIGS. 2 to 5, and the force set 2 is loaded. Perform positioning.

Also, the pinch roller 56 and the protrusion 64 on the pinch roller lever 54 are in the U-shaped groove 12 of the force set 2, and the pull-out lever 70
The guide roller 76 and the protrusion 82 enter into the other U-shaped groove 10. On the other hand, a rod 164 connected to the holder 32 with a pin 162 is guided through a square hole 170 provided in the substrate 22 and enters below the substrate.

When the holder 32 is pushed in until the force set 2 is in the correct operating position, the tip of the holder lock plate 324, which is biased in the direction of arrow B by the tension spring 326, will enter the notch 168 formed in the rod 164, so let go. However, the holder 32 is locked in this position. When the holder 32 is locked in the operating position, a switch (not shown) is activated and the second plunger 294 operates as shown in FIG. to move in the direction. The first arm 306, which is rotatably loosely fitted onto the shaft 302 installed on the auxiliary actuation plate 284, also moves in the direction of arrow B, and in this state, the pin 310 moves the end surface of the wide part of the stepped square hole 336 in the direction of arrow B. direction and rotate the lever 332 counterclockwise in FIG. 6 about the shaft 334. Move lever 3
Since the pin 338 provided at the tip of the idler 202 also moves in the direction of arrow B, the idler drive rod 224, sliding plate 204, and braking member 212 move as one in the direction of arrow B, and the large diameter portion 198 of the idler 202 moves in the direction of arrow B. When they come into contact with the pulley 194, the sliding plate 204 and the braking member 212 stop moving in the direction of arrow B, but the idler drive rod 224 is further displaced downward, so that the tension spring 242 is eventually stretched, and this force is applied to the idler 202. The large diameter portion 198 is pressed onto the pulley 194. Furthermore, the amount of displacement of the pin 338 in the direction of arrow B is set so that the step 190 formed on the protrusion 188 of the brake lever 182 is slightly displaced in the direction of arrow B, as shown in FIG. 174 in the counterclockwise direction in FIG. 7, the brake of the take-up reel stand 40 is released (the brake of the supply reel stand 38 remains in operation). As shown in the time chart in Figure 12 and Figures 7 and 8, there is a slight delay (approximately 0.1
~0.2 seconds) The first plunger 256 operates, and after a further delay (approximately 0.1 seconds after the first plunger 256 operates)
~0.2 seconds) The second motor 192
It is designed to rotate clockwise in the figure.

When the first plunger 256 operates, the main operating plate 244 moves in the direction of arrow A against the tension spring 250. Therefore, the first step portion 260 of the main operating plate 244 moves the second pin 60 of the pinch roller lever 54 in the direction of arrow A, so that the pinch roller lever 54 rotates counterclockwise in FIG. 7 about the shaft 52. The pinch roller 50 pulls the magnetic tape 4 out of the force set 2, but the capstan 46 and the pinch roller 5
0 is set so that it does not come into contact with it. At this time, the protrusion 64 opens the lid 16 of the force set 2. Also, the protrusion 264 of the main operating plate 244
similarly moves the third pin 88 of the pull-out lever 70 in the direction of arrow A, so the pull-out lever 70 rotates clockwise in FIG. At the same time as the pad 80 pulls out the magnetic tape 4 to the tape guide 102, the spring 104
It is designed to be crimped by the urging force of. At this time, the protrusion 82
then open the lid 14 of power set 2. Pinch roller lever 54
When the second pin 60 of the lock plate 14 is displaced in the direction of the arrow A, the lock plate 14
2 is displaced to the right in FIG. 7 by the biasing force of the spring 136.
Therefore, the latch plate release arm 130 is rotated counterclockwise in FIG. 7 about the shaft 132 via the pin 144. Also, since the pin 144 moves to the left in FIG. 8, the second arm 30
8 is a positional relationship in which the side surface 316 is pushed by the pin 144 and rotates clockwise in FIG. become. On the other hand, as the main actuating plate 244 moves in the direction of arrow A, the auxiliary arm 274 also moves in the direction of arrow A, and the roller 270 enters the square hole 280 provided in the base plate 22, and the auxiliary arm 274 moves counterclockwise in FIG. The upper part of the pin 282 planted at the tip rotates until it touches the lower surface of the pinch roller lever 54, resulting in the state shown in FIG. 7. Next, when the second motor 192 and pulley 194 rotate clockwise in FIG.
98 is pressure-welded to the pulley 1 river 94, and the idler 2
Since the small diameter portion 200 of No. 02 receives a braking force from the braking portion 218 of the braking member 212, the sliding plate 204 is eventually rotated counterclockwise in FIG. Large diameter portion 198 of powered idler 202
is approximately 115 mm between the pulley 194 and the take-up reel stand 40.
Since the rotation of the pulley 194 is transmitted to the take-up reel stand 40 at the biting angle of The magnetic tape 4 is wound up so that there is no slack when it is pulled out of the set 2.

Thereafter, as shown in the time chart of FIG. 12, the first plunger 256, the second plunger 294, and the second motor 192 are automatically de-energized.

When the first plunger 256 is de-energized, the main actuating plate 2
44 is returned to the position shown in FIG. 5 by the tension spring 250, and the pinch roller lever 54 is also biased by the tension spring 92 in the direction of returning to its original position, but as shown in FIG. When the magnetic tape 4 is displaced in the B direction, the second pin 60 comes into contact with the protrusion 146 of the displaced lock plate 142, and the pinch roller 50 maintains the position in which the magnetic tape 4 is pulled out. On the other hand, the pull-out lever 70 is also supported by a tension spring 92 on the shaft 6.
The guide roller 76 similarly rotates the magnetic tape 4 in the counterclockwise direction in FIG.
Keep it in the position where it is pulled out. In other words, the pinch roller 50 and the guide roller 76 are locked at a position where the magnetic tape 4 is slightly returned from the position where it is fully pulled out from the force set 2, so that the second motor 192 can sufficiently take up the slack as described above. The magnetic tape 4 stretched on the tape 4 will slacken a little. At the same time, when the power to the second plunger 294 is cut off, the auxiliary actuating plate 284 returns in the direction of arrow A due to the force of the tension spring 300, and the first arm 306 and second arm 3
08 also returns in the direction of arrow A. Since the second arm 308 is rotated clockwise in FIG. 5 by the pin 144 as described above, the protruding tip portion 314 cannot displace the holder lock plate 324.

As the first arm 306 moves in the direction of arrow A, the lever 332 also rotates clockwise in FIG. The rod 224, sliding plate 204, and brake member 212 return to their original positions as shown in FIG.
At this time, the idler 202, which was inserted between the pulley 194 and the take-up reel stand 40, is also returned to its original position by a cam (not shown) as shown in FIG. Also, since the pin 338 returns in the direction of arrow A, the brake lever 18
2 also rotates clockwise in FIG. 9 about the shaft 1r4, and the brake shoe 178 comes into contact with the take-up reel stand 40 to apply a braking force. When the first arm 306 on the auxiliary actuating plate 284 moves in the direction of arrow A and returns to its original position (the position shown in FIG. 5), the third pin 88 of the drawer lever 70 remains moved in the direction of arrow A. Since the first arm 306 is in this state, the first arm 306 is rotated clockwise in FIG. It is important to note that the relationship is such that At the same time, the second motor 192 is also de-energized.

In this way, the magnetic tape 4 remains automatically pulled out from the force set 2, and the tape recorder comes to a halt as shown in FIG. Incidentally, instead of rotating the take-up reel stand 40 in order to take up the slack in the pulled-out magnetic tape 4, the motor 192 may be reversed to rotate the supply reel stand 38. At this time, the protrusion 1 of the brake lever 180
A stepped portion is provided toward 86 to release the braking force of the supply reel stand 38. Reproducing (recording) operation: Since the operational state of the mechanical parts is the same in the reproducing operation and the recording operation, the reproducing operation will be explained.

When the regeneration switch (not shown) is pressed from the stopped state in FIG. 9, the first plunger 256 and second motor 192 are turned ON and then (approximately second plunger 294 turns ON and enters the state shown in FIG. 10. When the first plunger 256 turns ON, the main actuating plate 244 moves in the direction of arrow A, so that the protrusion 264
rotates the pull-out lever 70 through the third pin 88 in the clockwise direction in FIG. Add the required tension. On the other hand, since the auxiliary arm 274 also moves together with the main actuating plate 244 in the direction of the arrow A, the roller 270 is inserted into the square hole 280 provided in the base plate 22.
The auxiliary arm 274 is rotated counterclockwise in FIG. 3 by the tension spring 278. This auxiliary arm 274
The rotational movement of the pinch roller lever 54 is almost the same as the loading movement described above, but the difference is that the pinch roller lever 54
is locked in the advanced position in the direction of arrow A, so the upper part of the pin 282 installed at the tip of the auxiliary arm 274 does not touch the bottom surface of the pinch roller lever 54 and the auxiliary arm 274
rotates to a position parallel to the main operating plate 244, and when the main operating plate 244 further moves in the direction of arrow A, the auxiliary arm 2
The side surface of the pin 282 of 74 rotates the pinch roller lever 54 in the direction of arrow A and presses the pinch roller 50 against the capstan 46 across the magnetic tape 4, so that the magnetic tape 4 is in contact with each magnetic head. It is transferred at a constant speed to the right in Fig. 10. In this state, the main operating plate 244 and the auxiliary arm 274 move relative to each other in the direction in which the tension spring 278 extends, so that the force of the tension spring 278 presses the pinch roller 50 against the capstan 46. As the main actuating plate 244 moves in the direction of arrow A, the second step portion 262 also moves in the direction of arrow A, so that the rotation arm 120, whose rotation was restricted by the wire spring 126, rotates the shaft 116 by the tension spring 124. The hook 118 and idler drive rod 224 are rotated counterclockwise around the center to the state shown in FIG.
The engagement position relationship with the first bent portion 236 is severed.

Next, a little later (about 0.1 to 0.2 seconds in terms of time), the second
The plunger 294 turns ON, and the auxiliary actuating plate 284 and the first
Arm 306 and second arm 308 are also displaced in the direction of arrow B.

At this time, it should be noted that the third part of the drawer lever 70 is
Since the pin 88 is at a position shifted in the direction of arrow A, the pin 310 of the first arm 306 is inserted into the stepped square hole 33 of the lever 332.
It is located in the narrow part of 6. That is, the amount of displacement of the first arm 306 in the direction of arrow B according to the second plunger 294 is the same as the loading operation described above, but the amount of rotation of the lever 332 increases, and therefore the displacement of the pin 338 in the direction of arrow B. The amount also increases. When the idler drive rod 224 moves in the direction of arrow B, the pulley 194 of the second motor 192 is rotating clockwise in FIG.
, and the sliding plate 204 rotates counterclockwise in FIG. 10 about the third shaft 220. Therefore, idler 202
A large-diameter portion 198 enters between the pulley 194 and the take-up reel stand 40 and controls the rotation of the pulley 194 from the take-up reel stand 4.
0 and the reel hub 8 of the force set 2, and the magnetic tape 4 fed out by the capstan 46 and the pinch roller 50 described above is wound into the force set 2. When the pin 338 moves in the direction of arrow B, it not only presses the protrusion 188 of the brake lever 182 and rotates the brake lever 182 counterclockwise in FIG. Since the amount has increased, the protrusion 186 of the brake lever 180 is also pressed and the brake lever 180 is rotated clockwise in FIG. be done. Further, since the pin 38 presses the rear end of the brake member 212 against the ring spring 216, the small diameter portion 200 of the idler 202 and the brake portion 218 are pressed against each other, as shown in FIG.
Since the engagement with the pulley 194 is disengaged and the braking force on the idler 202 is lost, the rotational torque of the pulley 194 is reduced to the take-up reel stand 40.
The structure allows for efficient transmission of information to Note that by moving the idler drive rod 224 in the direction of arrow B, the first
The first bent portion 236 also moves in the direction of arrow B, but as described above, the rotating arm 120 is rotated as shown in FIG. 10, and the first bent portion 236 and the hook 118 are engaged. I don't get it.

In this manner, a reproducing operation state as shown in FIG. 10 is performed. When the stop switch (not shown) is pressed from this state, the first plunger 256, the second plunger 294, and the second
Since the power to the motor 192 is cut off, each actuating plate and member returns to its original position by the restoring force of the spring and comes to a stopped state as shown in FIG.

Rapid forward operation: From the stopped state shown in Figure 9, press the rapid forward switch (not shown)
When pressed, the second plunger 256 moves to 0 as shown in FIG.
At the same time, the second motor 192 rotates clockwise in FIG. 11 with an applied voltage higher than that during the regeneration operation, resulting in the state shown in FIG.

When the second plunger 294 turns ON, the braking force on the supply reel stand 38 and the take-up reel stand 40 is released by the pin 338 in the same manner as explained in the section of the regeneration operation. Also, the large diameter portion 198 of the idler 202 takes up the rotation of the pulley 194 and directs the rotation of the pulley 194 to the reel hub 8 of force set 2 according to the reel stand 40.
11 in the clockwise direction to wind up the magnetic tape. At this time as well, the pin 338 connects the rear end of the braking member 212 to the ring spring 216.
Since the small diameter portion 200 of the idler 202 is pressed against the
Since the engagement with the braking portion 218 is disengaged and the braking force applied to the idler 202 is lost, the rotational torque of the pulley 194 is efficiently transmitted to the take-up reel stand 40. Incidentally, since the voltage applied to the second motor 192 is higher than during the reproduction operation, the torque and rotational speed for winding the magnetic tape 4 are naturally higher. On the other hand, since the first plunger 256 does not operate, the main operating plate 25
4 does not change.

Therefore, as shown in FIG. 2, the rotation of the rotating arm 120 by the tension spring 124 is restricted by the engagement between the wire spring 126 and the second step portion 262 of the main operating plate 244.
As shown in FIG. 11, when the first bent portion 236 of the idler drive rod 224 moves in the direction of arrow B, the first bent portion 236 and the hook 118 of the rotating arm 120 engage with each other. The first bending portion 236 moves the rotating arm 120 along the arrow B
As a result, the sliding plate 114 moves in the direction of arrow B against the force of the tension spring 124, and the pair of shift pins 110 planted on the sliding plate 114 separates the magnetic tape 4 from each magnetic head. . In this way, the magnetic tape 4
The magnetic tape 4 can be rapidly fed onto the take-up reel without the magnetic tape coming into contact with each magnetic head. When a stop switch (not shown) is pressed in the above state, the second plunger 256 and the second motor 192 are de-energized, resulting in the stopped state shown in FIG. 9.

Rewinding operation: The rewinding operation is almost the same as the fast forwarding operation described above, except that the second motor is rotating in the opposite direction.
The large diameter portion 198 of the idler 202 enters between the pulley 194 and the supply reel stand 38, rotates the supply reel stand 38 counterclockwise in FIG. The detailed explanation will be omitted since it is only about winding up.

Queue operation: The queue operation is to search for a position signal (address signal) written in advance on the magnetic tape 4 by running the magnetic tape 4 at high speed, and when the queue head 96 detects the position signal, stops the tape recorder. This is an operation for locating the position of the magnetic tape 4 in order to set the magnetic tape 4 to the playback state, and is an extremely convenient function for locating the beginning of a desired song when several programs are recorded on the magnetic tape 4.

From the stopped state shown in Figure 9, the key switch (not shown)
When you press the first plunger 256 as shown in FIG.
is turned on, and at the same time, the same high voltage as during the fast forward operation is applied to the second motor 192. A little later (about 0.1 to 0.2 seconds)
The second plunger 294 is turned on. This state is almost the same as the regeneration operation described above, but the only difference is that a higher voltage is applied to the second motor 192 than during the regeneration operation. From this state, as shown in FIG. 12, the first plunger 256 is de-energized, so the contact between the capstan 46 and the pinch roller 50 is cut off, and the pinch roller lever 54 and the drawer lever 70 are separated from each other as shown in FIG. In the stopped state shown in FIG.
The pulley 19 enters between the take-up reel 94 and the take-up reel 40.
4 is transmitted to the winding reel table 40, and the magnetic tape 4 is
is wound onto the winding side reel hub 8 at high speed.

This condition is very similar to the fast-forward operation described above, but since the first plunger 256 is operated and then the second plunger 294 is operated, the first fold of the idler drive rod 224 is reversed as explained in the regeneration operation section. The curved portion 236 and the hook 118 of the pivot arm 120 do not engage. Therefore, since the shift pin 110 also does not move in the direction of arrow B, the magnetic tape 4
The take-up reel is moved at high speed while contacting each magnetic head.
・It is wound up on the winder 8. In this manner, when the cue head 96 detects a desired signal recorded on the magnetic tape 4, the tape recorder is configured to switch to a stop state or a playback state. In the above explanation, the magnetic tape 4 is fed at high speed in the fast forward direction, but if the rotation direction of the second motor 192 is reversed, the magnetic tape 4 can be fed at high speed in the unwinding direction and the same operation can be performed. It's obvious.

Eject operation: When the eject push button 158 is pushed toward the board against the compression spring 160 from the stopped state shown in FIG.
8 is pushed in the direction of arrow A, so the latch release arm 130
The pin 144 rotates clockwise around the shaft 132 in FIG.
locking plate 1 connected to unlatching arm 130 at
42 moves to the left in FIG. The pull-out lever 70 rotates clockwise in FIG. 9 about the center, and counterclockwise in FIG. 9 about the shaft 68, returning to its original position as shown in FIG.

As both levers return to their original positions, a switch (not shown) is activated and the second plunger 29 is activated as shown in FIG.
4 and the second motor 192 operate to rotate clockwise in FIG. Pinch roller lever 54 and drawer lever 7
When the second plunger 294 operates in the position shown in FIG. 2, the auxiliary actuating plate 284 moves in the direction of arrow B against the tension spring 300. The first arm 306, which is rotatably loosely fitted onto the shaft 302 mounted on the auxiliary actuation plate 284, also moves in the direction of arrow B. In other words, as shown in Figure 6, the first
Since the pin 310 planted on the arm 306 is located in the wide part of the stepped square hole 336 of the lever 332, the stroke of the pin 338 becomes small, releasing the braking force only on the take-up reel stand 40, and releasing the braking force on the idler 202. Large diameter portion 198
enters between the pulley 194 and the take-up reel stand 40, transmits the rotation of the pulley 194 to the take-up reel stand 40, rotates the take-up side reel hub 8 clockwise in FIG. When the magnetic tape 4 returns to its original position, the slackened magnetic tape 4 is wound onto a reel hub 8 on the winding side. At this time, the braking force of the supply reel stand 38 has not been released, so when the magnetic tape 4 is stretched within the force set 2, the take-up reel stand 38 cannot rotate any further. On the other hand, the second arm 308, which is rotatably fitted loosely onto the shaft 304 set on the auxiliary actuation plate 284, also moves in the direction of arrow B, so that the tip protrusion 314 and the bent portion 328 of the holder lock plate 324 engage with each other. is removed, and the second arm 308 rotates slightly in the counterclockwise direction in FIG. 6 due to the biasing force of the tension spring 312, but since it comes into contact with the second bent portion 298 of the auxiliary actuating plate 284, the state shown in FIG. 6 is maintained. .

Next (approximately 0.1 to 0.3 seconds) as shown in Figure 12, the second
When the power to the plunger 294 is cut off, the auxiliary actuating plate 284 returns from the state shown in FIG. 6 in the direction of arrow A by the tension spring 300, and the idler drive rod 224 also returns to its original position shown in FIG.

The idler 202 is also returned to the state shown in FIG. 2 by a cam (not shown), and the brake lever 182 is brought into contact with the take-up reel stand 40 as shown in FIG. On the other hand, the pin 144 is attached to the second arm 30 as shown in FIG.
When the second arm 308 returns in the direction of arrow A from the state shown in FIG. Since it is displaced in the direction, rod 164
The tip of the holder lock plate 324 is removed from the notch 168 of the holder 32, and the holder 32 is rotated clockwise in FIG. do.

Rod 16 connected to holder 32 with pin 162
4 is also guided by the square hole 170 and moves to the right in FIG.
04, the engagement between the tip protrusion 314 and the bent portion 328 of the holder lock plate 324 is released, and the tip of the holder lock plate 324 hits the side surface of the rod 164 due to the biasing force of the tension spring 326. It moves in the direction of arrow B until it stops. Then, when the holder 32 is mounted again, the tip enters into the notch 168 as shown in FIG. 5 to lock the holder 32 in the mounting position (operating position). In addition, instead of winding the pulled-out magnetic tape 4 onto the take-up reel 8, the motor 192 is reversed and the magnetic tape 4 is wound onto the supply reel hub 6.
It can also be rolled up. At this time, the brake lever is 180
A stepped portion is provided on the protrusion 186 to release the braking force of the supply reel stand 38.

The eject operation described above is performed when electricity is supplied to the tape recorder.

However, if the supply of electricity to the tape recorder is cut off for some reason in the stopped state shown in FIG. The stepped portion 138 is pushed in the direction of arrow A by the inclined surface of the portion 154, and the latch release arm 130 rotates clockwise in FIG. As described above, the pinch roller lever 54 and the pull-out lever 70 return to their original states shown in FIG. 2. Even if a switch (not shown) is turned on this time, the second plunger 294 does not operate and the holder lock plate 324 does not move, so the holder 32 remains locked forever. Therefore, when the eject button 158 is pushed further toward the board, the inclined part of the second cam part 156 moves the stepped part 330 of the holder lock plate 324 in the direction of arrow A, and the lock of the holder 32 is released in the same manner as described above. It is structured as follows.
In this explanation, the lock of the pinch roller lever 54 and the lock of the holder 32 are sequentially released by the push stroke of the eject push button 158, but the first push-in operation locks the pinch roller lever 54, and the second push-in operation locks the pinch roller lever 54. It is also possible to unlock the holder 32.

As described above, in the magnetic recording and reproducing apparatus according to the present invention, when the magnetic tape pull-out means is in the inoperable state, the second plunger 294
When operated, the pin 310 planted on the first arm 306 on the auxiliary actuation plate 284 is located in the wide part of the stepped square hole 336 of the lever 332, so the amount of rotation of the lever 332 is small and the pin 338 is located on the take-up reel stand. Only the braking force of 40 is released.

Conversely, after the magnetic tape pull-out means moves to the position where the magnetic tape is pulled out to the outside of the force set, the second plunger 294
When the lever 332 is operated, the pin 310 planted in the first arm 306 is located in the narrow part of the stepped square hole 336 of the lever 332, so the amount of rotation of the lever 332 is large, and the pin 338 is moved to the take-up reel stand 40 and The braking forces on both supply reel stands 38 are released. In this way, the mechanism is configured so that the amount of rotation of the lever 332 driven by the second plunger 294 can be varied to release the braking force on only one reel stand, or to release the braking force on both reel stands. It is simple and can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a top view of a tape cassette used in the magnetic recording and reproducing apparatus of the present invention, FIG. 2 is a top view showing an example of the configuration of the magnetic recording and reproducing apparatus of the present invention, and FIG. 3 is a cross-sectional view thereof. Figure 4 is a sectional view of the same, Figure 5 is a rear view of the same, Figures 6, 7 and 8 are diagrams for explaining the loading operation of the device, and Figure 9 shows the stopped state of the device. Diagram for explanation,
Fig. 10 is a diagram for explaining the playback (recording) state of the same device, Fig. 11 is a diagram for explaining the fast forwarding (rewinding) state of the same device, and Fig. 12 is a diagram for explaining the operation timing of the same device. It is a figure for explaining. 2...Force setting, 4...Magnetic tape,
22... Board, 38, 40... Reel stand, 50... Pinch roller, 54...
Pitch roller lever, 60...Second pin, 70
... Bow lever, 76 ... Guide roller, 88 ... Third pin, 142 ... Lock plate, 144 ... Pin, 146・・・・・・
Projection, 164... Rod, 168...
・Notch, 180, 182... Brake lever 224... Idler drive rod, 236...
....First bending part, 244...Main operating plate, 2
74... Auxiliary arm, 282... Pin, 284... Auxiliary operating plate, 294...
Second plunger, 306...First arm, 30
8...Second arm, 310...Pin,
324... Holder lock plate, 332...
・・Lever 336・・・・Stepped square hole, 338・
·····pin.

Claims (1)

[Scope of Claims] 1. A magnetic recording and reproducing device of a type in which a magnetic tape is wound around a pair of juxtaposed reel hubs and the magnetic tape is pulled out of the cassette and run from a built-in cassette, which is connected to the pair of reel hubs. A pair of reel stands that rotate integrally together, a control means that applies a braking force to each of the pair of reel stands, a magnetic tape pull-out means that pulls out the magnetic tape to the outside of the cassette, and a control means that applies the braking force of the braking means to the outside of the cassette. a release member to be released; a plunger connected to the release member via an actuation member so as to drive the release member; the actuation member and the release member are connected in two movable positions, and the plunger is in a first position. At one time, the release member almost follows the actuating member and moves, but when it is in the second position, there is a gap between the release member and the actuating member, and the movement is greater than when it is in the first position. and a displacement variable means for reducing the displacement amount of the release member, and when the displacement amount variable means is in the second position when the plunger operates and the displacement amount of the release member is small, the control is performed. The braking force of only one of the reel stands is released among the means, and when the displacement amount variable means is in the first position and the amount of displacement of the release member is large, the braking force of both the reel stands is released. What is claimed is: 1. A magnetic recording and reproducing device characterized in that it is configured to perform 2. Only when the magnetic tape pull-out means is in a position where the magnetic tape is pulled out to the outside of the cassette, the displacement amount variable means is set to the first position.
2. The magnetic recording and reproducing apparatus according to claim 1, further comprising a control means for controlling the displacement variable means so that the displacement amount variable means is at the position.