JPS6161456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and in particular, uses the driving force of a motor in the forward direction to drive a capstan, and uses the driving force in the reverse direction to drive driven systems other than the capstan. The present invention relates to a magnetic recording/reproducing device configured to perform.

Conventionally, this type of device is known as, for example, the patent application 1984-
No. 49490 proposed this, but in this configuration, the disturbance due to the loss torque of the one-way clutch that transmits the driving force of the motor to a driven system other than the capstan is transmitted to the capstan.
The disadvantage was that high-precision capstan rotation performance could not be obtained, and wow and flutter performance deteriorated.

The present invention provides a magnetic recording/reproducing device that eliminates these drawbacks, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a diagram showing a stopped state of a magnetic recording/reproducing apparatus in an embodiment of the present invention.

The capstans 2 and 4 have bearings 12 and 14 fitted in bearing housings 8 and 10 disposed on the main board 6.
It is rotatably supported on the shaft. Flywheels 24 and 26, which have gears 16 and 18 and gears 20 and 22 formed on their outer peripheries, rotate integrally with capstans 2 and 4, respectively. A motor shaft 30 of the motor 28 that rotates in both forward and reverse directions.
A pulley 34 is inserted through a one-way clutch 36 to a pulley 32 that rotates together with the pulley 32 . This one-way clutch 36 transfers the rotational force of the motor 28 to the pulley 38 when the motor 28 rotates in the direction of the arrow 38.
The specific structure is proposed in Japanese Patent Application No. 127556/1983. Pulley 3
A capstan belt 40 is stretched between the flywheel 24 and the flywheel 2, and the capstan belt 40 transfers the rotational force of the motor 28 to the flywheel 2.
4 and 26, and the flywheels 24 and 26 are rotated in the directions of arrows 42 and 44, respectively. Pinch roller arms 50 and 52, which rotatably hold the pinch rollers 46 and 48, are rotatably held by pinch roller arm shafts 54 and 56, which are mounted on the main substrate 6. The constant speed drive gears 58, 60 are rotatably held by gear arms 62, 64 which are rotatably supported by the bearing housings 8, 10, and are rotatably supported by the gears 16, 20 formed on the flywheels 24, 26.
They are always engaged with each other.

Reel bases 70 and 72 having reel base gears 66 and 68 formed on their outer peripheries are rotatably held by reel shafts 80 and 82 that are mounted on reel shaft bosses 76 and 78 disposed on a sub-board 74. The locking shafts 64, 86 installed on the pinch roller arms 50, 52 engage with the engaging portions 62a, 64a of the gear arms 62, 64, respectively, and are suspended between the main board 6 and the gear arms 62, 64. The gear arms 62, 64 are driven at constant speed by the gears 58, 64 against the biasing forces of the tension springs 88, 90.
60 is locked at a position spaced apart from the reel platform gears 66 and 68. The high-speed drive gears 92 and 94 are rotatably held by gear arms 96 and 98 which are rotatably held by the reel shaft bosses 76 and 78, and are constantly engaged with the reel base gears 66 and 68, respectively. A lever 104 that is slidably guided by shafts 102a and 102b mounted on the main board 6 is connected to a tension spring 104 that is suspended between gear arms 96 and 98.
The gear arms 96, 98 are locked in a position where the high-speed drive gears 92, 94 are spaced apart from the gears 18, 22 formed on the flywheel against the urging force of the gear arms 96, 98. A magnetic head 11 is mounted on a head board 108 that is slidably guided by a shaft 106 installed on the main board 6.
0 is placed. Shaft 11 planted on main board 6
A tension spring 116 is suspended between the drive plate 114, which is rotatably held by the head plate 2, and the head substrate 108. The locking portion 114a formed on the drive plate 114 engages with the engagement shaft 118 set on the head board 108 against the biasing force of the tension spring 116, and the head board is moved to a position where the magnetic head 110 is separated from the tape 120. 108 is locked. Long hole part 122a, 1
The lever 122 having the shape 22b is rotatably held on a shaft 124 mounted on the drive plate 114. The drive levers 126 and 128 rotatably held by the pinch roller arm shafts 54 and 56 have elongated holes 122.
The shafts 130, 132 inserted into the shafts a, 122b are set up, and pinch roller springs 134, 136 are suspended between the pinch roller arms 50, 52.

Projecting pieces 126a, 1 of drive levers 126, 128
28a is the bent portion 50a, 5 of the pinch roller arm.
Pinch roller arms 50, 52 are locked in positions where they abut against capstans 2a and pinch rollers 46, 48 are separated from capstans 2, 4. The selection plate 13 is slidably guided by a shaft 140 installed on the main board 6
8 are formed with bent portions 138a and 138b. A bent portion 144a of the selection plate 144, which is slidably guided by a shaft 142 mounted on the main board 6, is in contact with one end of the gear arm 98. Selection board 13
Shafts 150 and 152 planted at 8 and 144, respectively
is rotatably held by a shaft 146 set on the main board 6, and is an elongated hole 148 formed in a lever 148.
a and 148b, respectively.

A pulley 156 is attached to the shaft 154 installed on the main board 6.
and gear 158 are held rotatably. Pulley 3
A belt 160 is stretched between the motor 2 and the pulley 56, and the rotational force of the motor 28 is transmitted to the pulley 156 at a speed substantially proportional to the diameter ratio of the two. A one-way clutch 162 similar to one-way clutch 36 described above is constructed and disposed between pulley 156 and gear 158 to transmit rotation of motor 28 in the direction of arrow 164 to gear 158. Gears 168a and 168b are formed on a stepped gear 168 which is rotatably held on a shaft 166 mounted on the main substrate 6, and the gear 168b meshes with the gear 158. A gear 17 is rotatably held on a shaft 170 set on the main board 6 and has a triangular cam 172 integrally formed thereon.
4 is meshed with the gear 168a.

The rotational force of the motor 28 in the direction of the arrow 164 transmitted to the gear 158 by the one-way clutch 162 is
The speed is reduced by the tooth rows 168a, 168b, and 174 and transmitted to the triangular cam 172. A magnet 176 is disposed on the gear 174. Holder 17
A Hall IC 180 is disposed at 8 so as to face the magnet 176.

A cam follower 184 is slidably guided by a shaft 182 installed on the main substrate 6, and a shaft 186 is installed so as to sandwich the triangular cam 172, and the cam follower 184 follows the rotation of the triangular cam 172. A switching plate 190 rotatably held on a shaft 188 mounted on the main board 6 has cam surfaces 190a, 190b,
An elongated hole portion 190c is formed, and the elongated hole portion 190c engages with a shaft 192 planted on the selection plate 144.
A shaft 198 is mounted on a switching lever 196 which is rotatably held by a shaft 194 mounted on the cam follower 184 . Plate 2 slidably guided by shaft 200 and elongated hole 202 planted on main board 6
A pinion 206 rotatably held by a shaft 205 mounted on the cam follower 184 is engaged with a rack 184a formed on the cam follower 184. A pinion 216 is rotatably held by a shaft 208 set on the main board 6 and a shaft 214 set on a plate 212 that is slidably guided through an elongated hole 210.
Rack 184b formed at 84 and drive plate 11
It is meshed with a sector gear 114b formed at 4. A tension spring 222 is suspended between stoppers 218 and 220, which are rotatably held on shafts 208 and 200, respectively. Racks 226a and 226b are formed on a sliding plate 226 that is slidably guided by shafts 102a and 224 set on the main board 6, and the rack 226a meshes with the pinion 206. A stepped gear 230 is rotatably held on a shaft 228 mounted on the main board 6.
a, 230b are formed, and the gear 230a is the rack 2.
At 26b, gears 230b mesh with racks 104a formed on lever 104, respectively.
The electromagnetic coils 232 and 234 are attached to the main board 6. Cassette 23 containing tape 120
6 is positioned on a positioning shaft 238 and attached to the device.

The operation of the above embodiment will now be explained.
An operation button (not shown) for moving the tape 120 at a constant speed in the direction of arrow 240 from the stopped state of the apparatus shown in FIG. 1 energizes the electromagnetic coil 234 and rotates the motor 28 in the direction of arrow 164. motor 2
8 is transmitted to the pulley 156 by the belt 160 at a speed substantially proportional to the diameter ratio of the pulley 32 and the pulley 156. Furthermore, this rotational force is transferred to the gear 1 by a one-way clutch 162 that transmits rotation only when the motor 28 rotates in the direction of arrow 164.
58 and gear trains 158, 168b, 168
a, 174, and is transmitted to the triangular cam 172. At this time, the one-way clutch 36 is not rotationally engaged and the rotational force of the motor 28 is not transmitted to the pulley 34. Consequently, the flywheels 24, 26
does not rotate. When the triangular cam 172 rotates due to the rotational force of the motor 28, the cam follower 184, which moves linearly following the rotation of the triangular cam, moves as indicated by the arrow 246.
displacement in the direction.

Along with this, the shaft 198 moves along the cam surface 190a and rotationally displaces the switching plate 190. The displacement of the switching plate 190 is transmitted to the selection plate 138 via the selection plate 144 and the lever 148. Triangular cam 17
2 rotates 180 degrees from the position shown in FIG. 1, the selection plate 144 slides in the direction of arrow 240 and comes into contact with gear arm 96, and the selection plate 138 slides in the direction of arrow 242, as shown in FIG. It will be brought to the position shown.

Further, the plates 204 and 212 that rotatably hold the pinions 206 and 216 are
6 is the rack 184a, 18 of the cam follower 184
4b, they are displaced in the direction of arrow 246 following the displacement of the cam follower 184. At this time, as shown in FIG.
It rotates against the urging force of and engages with the plate 212.

When the triangular cam 172 rotates beyond 180 degrees and the cam follower 184 moves in the direction of arrow 244, the plate 204 follows the displacement of the cam follower 184 and is displaced in the direction of arrow 244, but the plate 212 is prevented from moving in the direction of arrow 244 by the stopper 218. Regulated. Therefore, the pinion 216 rotates around the shaft 214 in response to the displacement of the rack 184b, and the displacement of the cam follower 184 in the direction of the arrow 244 is transferred to the drive plate 1 by a differential mechanism (proposed in Japanese Patent Application No. 54-49489).
44 sector gear 114b. This causes the drive plate 114 to rotate in the direction of arrow 248.

The lever 122 connected to the drive plate 114 is displaced in the direction of arrow 250 in conjunction with the rotation of drive plate 114 in the direction of arrow 248. At this time, the drive levers 126 and 128 connected to the lever 122 both attempt to move in the direction of the arrow 250 in conjunction with the displacement of the lever 122, but the drive lever 128 is prevented from moving by the bent portion 138a of the selection plate 138. Regulated. However, since the movement of the drive lever 126 is not restricted, it moves, and the tension of the pinch roller spring 134 causes the pinch roller arm 50 to rotate in the direction in which the pinch roller 46 comes into pressure contact with the capstan 2. When the locking shaft 84 engages with the engaging portion 62a, the gear arm 62, which is locked against the biasing force of the tension spring 88, is released from the lock as the pinch roller arm 50 rotates. Meanwhile, the biasing force of the tension spring 88 causes the constant speed drive gear 58 to rotate in a direction in which it meshes with the reel base gear 66.

The head board 108 is rotated by the drive plate 114 and the magnetic head 11 is moved by the tensile force of the tension spring 116.
0 moves in the direction in which it comes into contact with the tape 120.

As shown in FIG. 5, when the triangular cam 172 further rotates 360 degrees, the head board 108 comes into contact with the cassette positioning shaft 238, and the engagement shaft 118 and the locking part 114a are separated, and the head board 108 is pulled The biasing force of the spring 116 holds the magnetic head 110 in a position where it contacts the tape 120. In the constant-speed drive gear 58, the engagement shaft 84 is separated from the engagement portion 62a, and the gear arm 62 is attached to the tension spring 88.
By being kept biased by the biasing force, the reel gear 66 meshes with the reel base gear 66 as shown in FIG. Further, when the pinch roller 46 comes into contact with the capstan 2 and the bent portion 50a and the protruding piece 126a are separated, the pinch roller 46 is pressed against the capstan 2 by the tensile force of the pinch roller spring 134.

As shown in FIG. 5, when the triangular cam 172 rotates 360 degrees and the above-described operation is completed, the magnet 176 and the Hall IC 180 face each other and a voltage is generated in the Hall IC 180 by the magnet 176. (not shown) rotates the motor 28 in the direction of arrow 38 and cuts off the power to the electromagnetic coil 234. motor 28
rotates in the direction of arrow 38, one-way clutch 36
are rotationally engaged, and the rotational force of the motor 28 is applied to the pulley 3.
4 and further transmitted to the flywheels 24 and 26 by a capstan belt 40. As a result, the capstan 2 rotates in the direction of the arrow 42 and cooperates with the pinch roller 46 to move the tape 120 in the direction of the arrow 24.
The reel stand 70 is moved at a constant speed in the 0 direction, and the rotational force of the flywheel 24 is transmitted through the constant speed driving gear 58, and the reel stand 70 winds up the tape 120, and the magnetic head 110 performs recording or reproduction. At this time, the one-way clutch 162 is not rotationally engaged and the rotational force of the motor 28 in the direction of the arrow 38 is not transmitted to the gear 58.

When an operation button (not shown) that brings the device from a constant speed running state in the direction of arrow 240 shown in FIG. The flywheels 24, 26 are disconnected from the motor 28 by the action of the one-way clutch 36. As mentioned above, the rotational force of the motor 28 is 1
The triangular cam 172 is activated by the action of the direction clutch 162.
, and the cam follower 184 moves in the direction of arrow 246. At this time, the plate 204 moves in the direction of arrow 246 following the displacement of the cam follower 184. Further, the plate 212 also moves in the direction of arrow 246 following the displacement of the cam follower 184 from the position shown in FIG. At this time, the stopper 218 is disengaged from the plate 212 and moved to the position shown in FIG. 1 by the biasing force of the tension spring 222. When the elongated hole 212a comes into contact with the shaft 208, the movement of the plate 212 in the direction of the arrow 246 is restricted, so the pinion 216 is moved against the shaft 214.
The cam follower 1 rotates around the
The displacement in the direction of arrow 246 of 84 is determined by the sector gear 114b.
to communicate. As a result, the drive plate 114 rotates in the direction of arrow 252, and the lever 12 that is interlocked with this rotates.
2 moves in the direction of arrow 254. When the lever 122 moves in the direction of arrow 254, the driving lever 126 interlocked therewith rotates in the direction of arrow 254, and its protrusion 126a comes into contact with the bent portion 50a due to the biasing force of the pinch roller spring 134. As a result, the pinch roller arm 50 is linked to the rotation of the drive lever 126, and the pinch roller 46 is moved to the capstan 2.
It rotates in the direction of arrow 254 away from. When the pinch roller arm 50 rotates in the direction of arrow 254, the engagement shaft 84 engages with the engagement portion 62a, and as the gear arm 62 rotates, the constant speed drive gear 58 moves to the reel stand. It is rotated in the direction away from the gear 66 against the biasing force of the tension spring 88. Further, as the drive plate 114 rotates, the head board 108 engages the locking portion 114a with the engagement shaft 118, so that the magnetic head 110 is separated from the tape 120 in accordance with the rotation of the drive plate 114. slide in the direction. The triangular cam 172
When the drive plate 114 is rotated 180 degrees and brought to the position shown in FIG. 1, the pinch roller 46, constant speed drive gear 58, and magnetic head 110 are also brought to the positions shown in FIG. After this series of operations is completed, the shaft 198, which has moved along the cam surface 190b following the displacement of the cam follower 184, moves to the switching plate 19.
Rotate 0. The displacement of the switching plate 190 is the selection plate 1
44 and the selection plate 138 via the lever 148, the selection plate 144 slides in the direction of the arrow 246, comes into contact with the gear arm 98, and the selection plate 138 slides in the direction of the arrow 240, respectively. It is brought to the position shown in the figure.

When the triangular cam 172 further rotates beyond 180 degrees, the cam follower 184 moves in the direction of arrow 244. At this time, since the movement of the plates 204 and 212 is not restricted, they follow the cam follower 184 and move in the direction of arrow 244. And triangular cam 17
2 rotates 360 degrees and reaches the position shown in FIG. 1, the cam follower 184 and plates 204, 212 are also brought to the position shown in FIG. The triangular cam 172
Rotate 360 degrees and magnet 176 connects to Hall IC 18
When a voltage is generated in the Hall IC facing 0, the aforementioned operation control circuit (not shown) rotates the motor 28 in the direction of the arrow 38. As described above, the stopping operation is completed by the various operations accompanying one rotation of the triangular cam 172, and the device enters the stopped state shown in FIG.

When the operation button (not shown) for causing the tape 120 to travel at a constant speed in the direction of arrow 242 from the state of constant speed travel in the direction of arrow 240 shown in FIG. The coil 234 is energized and the motor 28 is rotated in the direction of arrow 164. As described above, this rotational force of the motor 28 is transmitted to the triangular cam 172 by the action of the one-way clutch 162, and the cam follower 184 moves in the direction of the arrow 246.
moves along the cam surface 190b. Also, board 2
04 is displaced in the direction of arrow 246 following the displacement of the cam follower 184, and brought to the position shown in FIG. At this time, the plate 212 is also connected to the cam follower 184.
24 from the position shown in FIG.
It moves in six directions until the elongated hole 212a comes into contact with the shaft 208. When the elongated hole 212a comes into contact with the shaft 208, the movement of the plate 212 is restricted, so the pinion 2
16 rotates around the shaft 214 in response to the driving force in the direction of arrow 246 of the rack 184b, and transfers the driving force in the direction of arrow 246 of the cam follower 184 to the sector gear 11.
4b. By this, the drive plate 114
rotates in the direction of arrow 252, and rotates in the direction of arrow 240 described above.
The device is temporarily brought to a stop state by an operation similar to the stop operation from a constant speed running state in the direction. Thereafter, following the displacement of the cam follower 184, the shaft 198 moves along the cam surface 190b, causing the switching plate 190 to rotate. The displacement of the switching plate 190 is transmitted to the selection plate 138 via the selection plate 144 and the lever plate 148,
The selection plate 144 is slid in the direction of arrow 246 and comes into contact with the gear arm 98, while the selection plate 138 is slid in the direction of arrow 240 and brought to the position shown in FIG. Triangular cam 172 is 180
As the cam follower 184 moves further in the direction of the arrow 244, the plate 204 follows the movement of the cam follower 184 and moves in the direction of the arrow 244, but the plate 212 is prevented from moving by the stopper 218 attracted to the electromagnetic coil 234. Since the pinion 216 is regulated, the pinion 216 rotates around the shaft 214 under the driving force of the rack 184b, and the cam follower 184
The driving force in the direction of arrow 244 is transmitted to the sector gear 114b. As a result, the drive plate 114 rotates in the direction of the arrow 248, and similarly to the constant speed traveling in the direction of the arrow 240 described above, the drive plate 114 moves through the system to the drive lever 126,
However, since the movement of the drive lever 126 is restricted by the bent portion 138b of the selection plate 138, only the drive lever 128 moves in the direction of the arrow 250. When the triangular cam 172 further rotates through 360 degrees, the constant speed drive gear 60 moves to the reel pin gear 68 as shown in FIG. The meshing pinch roller 48 presses against the capstan 4.

The magnetic head 110 also contacts the tape 120. When the triangular cam 172 rotates 360 degrees and the above-described operation is completed, and the magnet 176 faces the Hall IC 180 and a voltage is generated in the Hall IC, the aforementioned operation control circuit (not shown) moves the motor 28 in the direction of the arrow 38. direction, and power to the electromagnetic coil 234 is cut off. The rotational force of the motor 28 in the direction of the arrow 38 is applied to the flywheels 24, 2 by the action of the one-way clutch 36 as described above.
6 and rotates in the direction of the arrow 44, the capstan 4 cooperates with the pinch roller 48 to rotate the tape 12.
0 runs at a constant speed in the direction of arrow 242, the reel stand 72 to which the rotational force of the flywheel 26 is transmitted by the constant speed driving gear 60 winds the tape 120, and the magnetic head 110 performs recording or reproduction. At this time, the rotational force of the motor 28 is not transmitted to the gear 158 due to the action of the one-way clutch.

When an operation button (not shown) for causing the tape 120 to run at high speed in the direction of arrow 240 from a constant speed running state in the direction of arrow 240 shown in FIG. 232 is energized and the motor 28 is rotated in the direction of arrow 164. As described above, this rotational force of the motor 28 is transmitted to the triangular cam 172 by the action of the one-way clutch 162, and the cam follower 184 is moved in the direction of the arrow 2.
Sliding displacement in 46 directions. Along with this, axis 19
8 moves along the cam surface 190b. At this time, the plate 204 is displaced in the direction of arrow 246 following the displacement of the cam follower 184, and is brought to the position shown in FIG. At this time, the stopper 220, which is attracted by the electromagnetic coil 232, rotates against the biasing force of the tension spring 222 and engages with the plate 204. Further, the plate 212 also follows the displacement of the cam follower 184, and the elongated hole 212a moves toward the shaft 246 from the position shown in FIG.
Move until it touches 08. As a result, the stopper 218 is disengaged from the plate 212 and is brought to the position shown in FIG. 6 by the biasing force of the tension spring 222. When the elongated hole 212a comes into contact with the shaft 208, the movement of the plate 212 is restricted, so the pinion 2
16 rotates around the shaft 208 in response to the driving force of the rack 184b in the direction of the arrow 246, and the displacement of the cam follower 184 in the direction of the arrow 246 is transferred to the sector gear 114.
Transmit to b. As a result, the drive plate 114 rotates in the direction of arrow 252, and the device is once brought to a halt by an operation similar to the above-described stopping operation from the constant speed traveling state in the direction of arrow 240. Thereafter, following the displacement of the cam follower 184, the shaft 198 moves along the cam surface 190b, causing the switching plate 190 to rotate. The displacement of the switching plate 190 is transmitted to the selection plate 138 via the selection plate 144 and the lever 148, and the selection plate 144 slides in the direction of arrow 246 and comes into contact with the gear arm 98, and the selection plate 138 moves in the direction of arrow 240. 6, and are brought to the positions shown in FIG.

When the triangular cam 172 rotates beyond 180 degrees and the cam follower 184 moves in the direction of arrow 244, the plate 212 follows the displacement of the cam follower 184 and moves in the direction of arrow 244 since the movement of the plate 212 is no longer restricted.
move in the direction. However, the plate 204 is
0 restricts movement in the direction of arrow 244, pinion 206 receives the driving force of rack 184a, rotates around shaft 205, and moves cam follower 1.
84 in the direction of arrow 244 is transmitted to the rack 226a of the sliding plate 226. This causes the sliding plate 226 to slide in the direction of arrow 246.

The displacement of sliding plate 226 is transmitted to 230a of stepped gear 230 meshing with rack 226b, and further transmitted to rack 104a meshing with gear 230b, causing lever 104 to slide in the direction of arrow 250. When the triangular cam 172 further rotates through 360 degrees and is brought to the position shown in FIG. 7, the lever 104 is separated from the gear arms 96 and 98.
At this time, the amount of displacement of the sliding plate 226 is reduced substantially in proportion to the gear ratio of the gear 230a and the gear 230b, and is transmitted to the lever 104. As the lever 104 is separated, the gear arms 96 and 98 are moved to the high speed drive gears 92 and 9 by the biasing force of the tension spring 100.
4 is the gear 18, 22 of the flywheel 24, 26
However, the gear arm 98 does not rotate because its movement is restricted by the bent portion 144a of the selection plate 144.
Only gear 6 rotates, and the high-speed drive gear 92 is shown in FIG.
Gear 1 of the flywheel 24 as shown in FIG.
It meshes with 8.

The triangular cam 172 rotates 360 degrees and the above-mentioned operation is completed, and the magnet 176 returns to the hole.
When a voltage is generated in the Hall IC 180 opposite to the IC 180, the aforementioned operation control circuit (not shown) rotates the motor 28 in the direction of the arrow 38 and cuts off the power to the electromagnetic coil 232. motor 28
The rotational force in the direction of the arrow 38 is applied to the flywheel 24, by the action of the one-way clutch 36 as described above.
26, and the rotational force of the flywheel 24 is transmitted to the reel stand 7 by the high-speed drive gear 92.
0 winds up the tape 120 at high speed.

When an operation button (not shown) that brings the device from a high-speed traveling state in the direction of arrow 240 shown in FIG. Rotate it. As mentioned above, this rotational force of the motor 28 is applied to the triangular cam 17 by the action of the one-way clutch 162.
2, and the cam follower 184 moves in the direction of arrow 246. Along with this, the shaft 198 moves along the cam surface 190a and rotates the switching plate 190. Rotation of the switching plate 190 is transmitted to the selection plate 138 via the selection plate 144 and lever 148. When the triangular cam 172 rotates 180 degrees from the position shown in FIG.
8 are slidably displaced in the direction of arrow 242 and brought to the positions shown in FIG. 4, respectively. Further, the plate 212 is displaced in the direction of arrow 246 following the displacement of the cam follower 184, and is brought to the position shown in FIG. At this time, the plate 204 also follows the displacement of the cam follower 184 and moves from the position shown in FIG.
04a moves until it comes into contact with the shaft 200. At this time, the stopper 220 is disengaged from the plate 204 and moved to the position shown in FIG. 1 by the biasing force of the tension spring 222. When the elongated hole 204a comes into contact with the shaft 200, the movement of the plate 204 is restricted, so the pinion 206 rotates around the shaft 205 to prevent the movement of the cam follower 184 in the direction of the arrow 246.
transmit to a. As a result, the sliding plate 226 is slidably displaced in the direction of arrow 244 and brought to the position shown in FIG. Furthermore, this displacement is the gear 230
When the signal is transmitted to the lever 104 via a and 230b, the lever 104 is slid in the direction of arrow 254 and comes into contact with the gear arm 96. As a result, the gear arm 96 is subjected to the biasing force of the tension spring 100, and the high-speed drive gear 92 is rotated in a direction away from the gear 18 of the flywheel 24, and is brought to the position shown in FIG.

When the triangular cam 172 further rotates by 360 degrees, the cam follower 184 moves in the direction of arrow 244. At this time, since the movement of the plates 204 and 212 is not restricted, they are moved in the direction of arrow 244 following the displacement of the cam follower 184 and brought to the position shown in FIG. When the triangular cam 172 rotates 360 degrees, the magnet 176 faces the Hall IC, and a voltage is generated at the Hall IC, the aforementioned operation control circuit (not shown) rotates the motor 28 in the direction of arrow 38. As described above, the stopping operation is completed by various operations accompanying one rotation of the triangular cam 172.

When the operation button (not shown) for causing the tape 120 to travel at high speed in the direction of arrow 242 from the state of high speed travel in the direction of arrow 240 shown in FIG. At the same time, the motor 28 is rotated in the direction of arrow 164. As described above, this rotational force of the motor 28 is transmitted to the triangular cam 172 by the action of the one-way clutch 162, and the cam follower 184 is moved in the direction of the arrow 2.
Displaces in 46 directions. Along with this, the shaft 198 moves along the cam surface 190a and rotates the switching plate 190. The rotation of the switching plate 190 is controlled by the selection plate 144,
It is transmitted to the selection plate 138 via the lever 148. The triangular cam 172 moves 180 degrees from the position shown in FIG.
When rotated once, the selection plate 144 slides in the direction of arrow 244 and comes into contact with the gear arm 96, while the selection plate 138 slides in the direction of arrow 242 and is brought to the position shown in FIG. 4, respectively. Also board 21
2 follows the displacement of the cam follower 184 and arrow 2
It is displaced in 46 directions and brought to the position shown in FIG. Further, the plate 204 also moves in the direction of the arrow 246 from the position shown in FIG. 7, following the displacement of the cam follower 184, until the elongated hole 204a comes into contact with the shaft 205.
When the elongated hole 204a comes into contact with the shaft 200, the movement of the plate 204 is restricted, so the pinion 206 is moved against the shaft 200.
05 and transmits the displacement of the cam follower 184 in the direction of arrow 246 to the sliding plate 226. As a result, the sliding plate 226 slides in the direction of arrow 244, and by the same operation as the above-mentioned stopping operation from the high-speed running state in the direction of arrow 240, the device is temporarily stopped.
It becomes stopped. The triangular cam 172 rotates further past 180 degrees, and the cam follower 184 moves toward the arrow 24.
The plate 212 that moves in four directions is a cam follower 184.
It moves in the direction of arrow 244 following the movement of. At this time, since the movement of the plate 204 is regulated by the stopper 220 that is attracted to the electromagnetic coil 232,
The pinion 206 rotates around the shaft 205 and transmits the displacement of the cam follower 184 in the direction of arrow 244 to the sliding plate 226. As a result, the sliding plate 226
is slidably displaced in the direction of arrow 246. Sliding plate 226
The displacement is transmitted to the lever 104 via the gears 230a and 230b, and the lever 104 is slid in the direction of the arrow 250. The triangular cam 172 rotates further.
When the lever 104 rotates 360 degrees, the gear arm 9
Separate from 6,98. Due to the separation of the lever 104, the gear arms 96, 98 release the tension spring 10.
The high-speed drive gears 92 and 94 try to rotate in the direction of meshing with the gears 18 and 22 of the flywheels 24 and 26 due to the applied force of 0, but the gear arm 96
Since the movement is restricted by the bent portion 144a of the selection plate 144, only the gear arm 98 rotates, and the high-speed drive gear 94 meshes with the gear 22 of the flywheel 26 as shown in FIG. . The triangular cam 172 rotates 360 degrees, the above-mentioned operation is completed, and the magnet 176 connects to the Hall IC.
When a voltage is generated in the Hall IC 180 opposite to the Hall IC 180, the aforementioned operation control circuit (not shown) rotates the motor 28 in the direction of the arrow 38 and cuts off the power to the electromagnetic coil 232. The rotational force of the motor 28 in the direction of the arrow 38 is applied to the flywheels 24, 2 by the action of the one-way clutch 36, as described above.
The rotation of the flywheel 26 is transmitted to the reel stand 72 by the high-speed drive gear 94, and winds up the tape 120 at high speed.

As described above, the magnetic recording and reproducing device of the present invention includes a motor that can rotate in either the forward or reverse direction,
A first and second rotating body that selectively transmits the rotational forces of the first and second rotating bodies rotated in mutually opposite directions by only the driving force in the normal rotation direction of the motor to the first and second reel stands, respectively; a second high-speed feed idler mechanism; a cam follower capable of linearly reciprocating in contact with a cam rotationally driven only by the driving force in the reverse direction of the motor; a slide plate movable parallel to the cam follower; It includes a pinion that is rotatably supported by the slide plate and meshes with a rack provided on the cam follower, and is moved from the first position to the second position by the forward movement of the cam follower, and from the second position to the second position by the backward movement of the cam follower. The differential mechanism includes a differential mechanism that is moved to a first position, an electromagnetic means that is operated by fast forwarding and rewinding operations, and a stopper that is operated by the electromagnetic means, and the differential mechanism is moved to a second position by the cam follower. When the differential mechanism is transferred, it engages with the slide plate constituting the differential mechanism to move the differential mechanism to the second position.
It has a position regulating mechanism that holds it in position, and a rack that is always engaged with a pinion that constitutes the differential mechanism,
When the differential mechanism is held at the second position, it is reciprocated in a differential relationship with the cam follower, thereby causing the first and second high-speed feed idler mechanisms to both move to the operating position and the non-operating position. a displacement mechanism associated with the cam follower to displace the cam follower; a switching plate movable between a second position for inhibiting movement; a second switch responsive to the displacement mechanism when the switching plate is in the first position;
a first high-speed feed idler mechanism responsive to the displacement mechanism when the switching plate is in a second position; and a first high-speed feed idler mechanism responsive to the displacement mechanism when the switching plate is in the second position. and a switching mechanism that displaces the switching plate of the switching mechanism to a second position in response to the forward movement of the cam follower when the fast-forward mode is selected from the constant speed mode, and also moves the differential mechanism to the second position. The displacement mechanism is moved in response to the backward movement of the cam follower to displace the first high-speed feed idler mechanism to the operating position, while when the rewind mode is selected from the fast forward mode, the cam follower In response to the forward movement of the cam follower, the switching plate of the switching mechanism is returned to the first position, and the displacement mechanism is reversely moved to return the first high-speed feed idler mechanism to the non-operating position. However, when the stop mode is selected from the rewind mode, the displacement mechanism is re-transferred in accordance with the movement of the cam follower to displace the second high-speed feeding idler mechanism to the operating position. Since the moving mechanism is configured to return to the first position, the driving force of the motor in the forward direction is used to run the tape at high speed, and the driving force of the motor in the reverse direction is used to switch the tape high speed running mode. This improves the efficiency of motor usage. In addition, the first and second high-speed feed idler mechanisms are moved to the operating position and the non-operating position by utilizing the reciprocating motion of the cam follower that can reciprocate around the cam that is rotationally driven by the driving force of the motor in the reverse direction. At the same time, by using the reciprocating movement of the cam follower to prevent displacement of one of the first and second idler mechanisms for high-speed feeding and allow displacement of the other, rapid traverse and winding can be performed. Since each return mode is realized, it is possible to realize a compact magnetic recording/reproducing device with smooth mode transition and excellent operability.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a stopped state of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional side view of the main part of the apparatus, FIG. 3 is a side view of the main part of the apparatus, The figure is a plan view showing the process in which the device transitions from a stopped state to a constant speed running state, Figure 5 is a plan view showing the same device in a constant speed running state, and Figure 6 is a plan view showing the process in which the device moves from a constant speed running state to a high speed running state. FIG. 7 is a plan view showing the process of transition to a running state, FIG. 7 is a plan view showing the device in a high-speed running state, FIG. 8 is a cross-sectional side view of main parts showing the same device in a constant-speed running state, and FIG. 9 is a plan view showing the same device in a high-speed running state. FIG. 2 is a cross-sectional side view of a main part showing the device in a high-speed running state. 2, 4... Capstan, 6... Main board, 1
6, 18, 20, 22...gear, 24, 26...
Flywheel, 28... Motor, 30... Motor shaft, 32, 34... Pulley, 36... One-way clutch, 40... Capstan belt, 46, 4
8... Pinch roller, 50, 52... Pinch roller arm, 54, 56... Pinch roller arm shaft, 58, 60... Constant speed drive gear, 62, 64
... Gear arm, 66, 68 ... Reel platform gear,
70, 72... Reel stand, 74... Sub board, 8
0,82...Reel shaft, 92,94...High speed drive gear, 96,98...Gear arm, 104...
Lever, 104a...Rack, 108...Head board, 110...Magnetic head, 114...Drive plate, 114b...Sector gear, 120...Tape,
122... Lever, 126, 128... Drive lever, 134, 136... Pinch roller spring, 13
8...Selection board, 138a, 138b...Bending part,
144...Selection board, 144a...Bending portion, 148
... Lever, 156 ... Pulley, 158 ... Gear, 160 ... Belt, 162 ... One-way clutch, 166a, 166b ... Gear, 172 ... Triangular cam, 174 ... Gear, 176 ... Magnet, 180 ...Hall IC, 184...Cam follower, 184a, 184b...Lack, 190...
...Switching plate, 196...Switching lever, 204...
Plate, 205...Shaft, 206...Pinion, 212
...Plate, 214...Shaft, 216...Pinion, 2
18,220...stopper, 226...sliding plate,
226a, 226b...Rack, 230...Stepped gear, 230a, 230b...Gear, 232,2
34... Electromagnetic coil, 236... Cassette.

Claims (1)

[Claims] 1. A motor that can rotate in either forward or reverse directions, first and second rotating bodies that are rotated in opposite directions by only the driving force in the forward direction of this motor, and these first and second rotating bodies. , first and second high-speed feed idler mechanisms that selectively transmit the rotational force of the second rotating body to the first and second reel stands, respectively, and rotation by only the driving force of the motor in the reverse direction. A cam follower that can linearly reciprocate in contact with a driven cam, a slide plate that can move parallel to the cam follower, and a pinion that is rotatably supported by the slide plate and meshes with a rack provided on the cam follower, transferred from the first position to the second position by the forward movement of the cam follower,
The differential mechanism includes a differential mechanism that is moved from the second position to the first position by the backward movement of the cam follower, an electromagnetic means that is operated by fast forwarding and rewinding operations, and a stopper that is operated by the electromagnetic means. a position regulating mechanism that engages with a slide plate constituting the differential mechanism to hold the differential mechanism in the second position when the mechanism is transferred to the second position by the cam follower; and a position regulating mechanism that holds the differential mechanism in the second position. has a rack that is always engaged with a pinion constituting the differential mechanism, and when the differential mechanism is held at the second position, the first and second high-speed feeds are reciprocated by the cam follower and the differential opening mechanism. a displacement mechanism associated with the first idler mechanism to displace both the first idler mechanism to an operating position and a non-operating position; a switching plate movable between a first position and a second position for inhibiting movement of a second high-speed feed idler mechanism, a second position responsive to the displacement mechanism when the switching plate is in the first position; a first high-speed feed idler mechanism responsive to the displacement mechanism when the switching plate is in a second position; and a first high-speed feed idler mechanism responsive to the displacement mechanism when the switching plate is in the second position. and a switching mechanism that displaces the switching plate of the switching mechanism to a second position in response to the forward movement of the cam follower when the fast-forward mode is selected from the constant speed mode, and moves the differential mechanism to the second position.
position and hold it therein, and in response to the return movement of the cam follower, move the displacement mechanism to displace the first high-speed idler mechanism to the operating position;
On the other hand, when the rewind mode is selected from the fast forward mode, the switching plate of the switching mechanism is returned to the first position in accordance with the forward movement of the cam follower, and the displacement mechanism is reversely transferred to the first high speed feeding mode. Although the idler mechanism is returned to the non-operating position and the displacement mechanism is re-transferred in response to the return movement of the cam follower to displace the second high-speed feed idler mechanism to the operating position, the transition from the rewind mode to the stop mode 2. A magnetic recording and reproducing apparatus characterized in that, when the cam follower is selected, the differential mechanism is returned to the first position in response to the backward movement of the cam follower.