JPS6161457B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-reverse tape recorder, and an object thereof is to improve the operability of the tape recorder and to reduce its size.

Auto-reverse tape recorders have been widely used as vehicle-mounted tape recorders, but in recent years there has been a strong demand for tape recorders that are compact and have excellent operability. In order to improve this operability, the conventional method is to utilize electromagnetic force, and an electromagnetic plunger or a motor is used as the driving source. However, in the case of using an electromagnetic plunger, since the volume occupied by the plunger is large, there is a problem that the device inevitably becomes large, and in the case of using a motor, the driving force to drive the tape is Since a separate driving force is required to drive the operating system, there is a problem in that a large motor is required. In an auto-reverse tape recorder that has a pair of pinch roller devices arranged to drive the tape in both forward and reverse directions, the above-mentioned problem arises because the pinch roller devices need to be driven selectively. appeared particularly prominently and hindered miniaturization. The present invention has been made in view of these points, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a diagram showing a stopped state of an auto-reverse type tape recorder in an embodiment of the present invention. The capstans 2 and 4 have bearings 12 and 1 fitted into bearing housings 8 and 10 disposed on the main board 6.
4 is rotatably supported. Gear 16 on the outer periphery
and 18, flywheels 24 and 26 forming gears 20 and 22 rotate integrally with capstans 2 and 4, respectively. Motor shaft 3 of motor 28 that rotates in either forward or reverse direction
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 3 when the motor 28 rotates in the direction of the arrow 38.
4, and a specific configuration is proposed in Japanese Patent Application No. 54-127556. 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, 52, which rotatably hold the pinch rollers 46, 48, are rotatably held by pinch roller arm shafts 54, 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 supported by 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 84, 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, 64 are rotatably held by gear arms 96, 98 which are rotatably held by the reel shaft bosses 76, 78, and are constantly meshed with the reel base gears 66, 68, respectively. A lever 104 slidably guided by shafts 102a and 102b mounted on the main board 6 moves the gear arms 96 and 98 at high speed against the biasing force of a tension spring 100 suspended between the gear arms 96 and 98. Drive gears 92 and 94 are locked at positions spaced apart from gears 18 and 22 formed on the flywheel. 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 engaged. 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.
Pinch roller springs 134, 136 are mounted on shafts 130, 132 inserted into the pins 122a, 122b, and pinch roller arms 50, 52, respectively.

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 138, 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 an elongated hole 148 formed in a lever 148 that is rotatably held on a shaft 146 installed on the main board 6.
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 156, 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 the one-way clutch 36 described above is constructed and arranged between the pulley 156 and the gear 158 to transmit the rotational force of the motor 28 in the direction of arrow 164 to the gear 158. Gears 168a and 168b are formed on a stepped gear 168 rotatably held by 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 gear trains 168a, 168b, and 174 and transmitted to triangular cam 172. A magnet 176 is disposed on the gear 174. Holder 1
A Hall IC 180 is disposed at 78 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 racks 226 mesh 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 236 containing tape 120
is positioned on the positioning shaft 238 and attached to the device.

The operation of the above embodiment will now be explained.
When the operation button (not shown) that causes the tape 120 to run at a constant speed in the direction of arrow 240 from the stopped state of the apparatus shown in FIG. 1 is operated, the operation control circuit (not shown)
energizes the electromagnetic coil 234 and the motor 2
8 in the direction of arrow 164. The rotational force of the motor 28 is reduced in speed substantially in proportion to the diameter ratio of the pulley 32 and the pulley 156, and is transmitted to the pulley 156 by the belt 160. Furthermore, this rotational force is transferred to the gear 158 by a one-way clutch 162 that transmits rotation only when the motor 28 rotates in the direction of arrow 164.
gear trains 158, 168b, 168a,
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. Therefore, the flywheels 24, 26 do 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, is displaced in the direction of arrow 246.

Accordingly, the shaft 198 moves along the camshaft 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 are engaged with the racks 184b of the cam follower 184, so that they are displaced in the direction of the arrow 246 following the displacement of the cam follower 184. At this time, the stopper 218 stops the electromagnetic coil 2 as shown in FIG.
34 rotates against the biasing force of the tension spring 222 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 arrow 244 is transferred to the drive plate 11 by a differential mechanism (proposed in Japanese Patent Application No. 54-49489).
The signal is transmitted to the No. 4 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 connected to the drive plate 1
In conjunction with the rotation in the arrow 248 direction of 14, the arrow 25
Displaced in the 0 direction. At this time, both drive levers 126 and 128 connected to lever 122 are lever 1.
The drive lever 128 attempts to move in the direction of the arrow 250 in conjunction with the displacement of the selection plate 138, but the movement of the drive lever 128 is restricted by the bending portion 138a of the selection plate 138. 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 by the force of the tension spring 88, is released from the lock as the pinch roller arm 50 rotates. At the same time, the constant speed drive gear 58 is moved to the reel base gear 6 by the biasing force of the tension spring 88.
Rotate in the direction of engagement with 6.

As the drive plate 114 rotates, the head board 108 is moved by the magnetic head 11 by the tension applied to 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.

The constant speed drive gear 58 has an engagement shaft 84 connected to the engagement portion 62
When the gear arm 62 is spaced apart from a and held biased by the biasing force of the tension spring 88, it meshes with the reel base gear 66 as shown in FIG. In addition, the pinch roller 46 comes into contact with the capstan 2 and the bent portion 5
When 0a 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 records or reproduces the tape. 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
Triangular cam 172 by action of directional 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 the tension spring 222 is applied to the first stopper 218.
It is brought to the position shown in the figure. 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 21.
4, and the displacement of the cam follower 184 in the direction of the arrow 246 is controlled by the differential mechanism by the sector gear 114.
Transmit to b. As a result, the drive plate 114 rotates in the direction of arrow 252, and the lever 1 that is interlocked with this rotates.
22 moves in the direction of arrow 254. Lever 122
When the lever moves in the direction of arrow 254, the driving lever 126 interlocked with this rotates in the direction of arrow 254, and the protruding piece 126a thereof 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 50 is interlocked with the rotation of the drive lever 126, and the pinch roller 46 is rotated in the direction of arrow 254 away from the capstan 2. When the pinch roller arm 50 rotates in the direction of arrow 254, the engagement shaft 84 engages with the engagement portion 62a, and the gear arm 62
As the pinch roller arm 50 rotates, the constant speed drive gear 58 is rotated in a direction away from the reel platform gear 66 against the biasing force of the tension spring 88. Further, the head board 108 is linked to the rotation of the drive plate 114 by the locking portion 114a engaging with the engagement shaft 118 as the drive plate 114 rotates.
Magnetic head 110 slides away from tape 120 in the direction of arrow 254. Triangular cam 172 is 180
When the drive plate 114 is rotated once and brought to the position shown in FIG. 1, the pinch roller 46 and the constant speed drive gear 5
8. The magnetic heads 110 are also moved to the positions shown in FIG. After this series of operations is completed, the cam surface 1 follows the displacement of the cam follower 184.
The shaft 198 that has moved along the axis 90b is connected to the switching plate 190.
Rotate. The displacement of the switching plate 190 is determined by the selection plate 14.
4 lever 148 to the selection plate 138, the selection plate 144 slides in the direction of the arrow 246, comes into contact with the gear arm 98, and the selection plate 1
38 are slidably displaced in the direction of arrow 240, and the first
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 stop operation is completed by the operation accompanying one rotation of the triangular cam 172, and the device enters the stopped state shown in FIG.

When an operation button (not shown) for causing the tape 120 to run at a constant speed in the direction of arrow 242 shown in FIG. 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, the cam follower 184 moves in the direction of the arrow 246, and the shaft 198 moves along the cam 190b. Also, the board 204
follows the displacement of the cam follower 184 and the arrow 24
It is displaced in six directions and brought to the position shown in FIG. At this time, the plate 212 also follows the displacement of the cam follower 184 and moves in the direction of arrow 246 from the position shown in FIG. 5 until the elongated hole 212a abuts against the shaft 208. When the elongated hole 212a comes into contact with the shaft 208, the plate 2
12 is pinion 216 because its movement is regulated.
The cam follower 18 rotates around the shaft 214 in response to the driving force of the rack 184b in the direction of the arrow 246.
4, the driving force in the direction of arrow 246 is applied to the sector gear 114b.
to communicate. As a result, the drive plate 114 rotates in the direction of arrow 252, and the device temporarily comes to a halt in the same manner as 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.

Changes in the switching plate 190 are made by selecting the selection plate 144 and the lever 1.
48 to the selection plate 138, the selection plate 144 is slid in the direction of the arrow 246 and comes into contact with the gear arm 98, and the selection plate 138 is moved in the direction of the arrow 246.
It is slidably displaced in 40 directions and brought to the position shown in FIG. The triangular cam 172 rotates further past 180 degrees, and the cam follower 184 moves toward the arrow 244.
When the plate 204 moves in the direction of the cam follower 184
The plate 212 moves in the direction of the arrow 244, but its movement is restricted by the stopper 218 attracted to the electromagnetic coil 234, so the pinion 216 receives the driving force of the rack 184b and moves in the direction of the
Rotate around 4 and arrow 2 of cam follower 184
Drive in 44 directions is transmitted to the sector gear 114b.
As a result, the drive plate 114 rotates in the direction of the arrow 248 and drives the drive levers 126 and 128 through the same path as the constant speed traveling in the direction of the arrow 240 described above. Since its movement is restricted by the bending portion 138b, only the drive lever 128 moves in the direction of arrow 250. When the triangular cam 172 further rotates through 360 degrees, the constant speed drive gear 60 moves to the reel carriage gear 68 as shown in FIG. The pinch roller 48 is brought into pressure contact with 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 at the same time, power to the electric 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 arrow 44, the capstan 4 cooperates with the pinch roller 48 to rotate the tape 1.
20 is caused to travel at a constant speed in the direction of arrow 242, and the reel stand 72, to which the rotational force of the flywheel 26 is transmitted by the constant speed drive gear 60, winds up the tape 120, and the magnetic magnet 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 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 running 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 rack 226a of sliding plate 266. 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 12 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 and allows the cam follower 184 to move 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 rotated in a direction in which the high-speed drive gear 92 is separated from the gear 18 of the flywheel 24 against the biasing force of the tension spring 100, and is brought to the position shown in FIG.

When the triangular cam 172 further rotates 360 degrees, the cam follower 184 moves in the direction of the arrow 244. At this time, since the movement of the plates 204 and 212 is not restricted, they follow the displacement of the cam follower 184, move in the direction of arrow 244, and are brought to the position shown in FIG. The triangular cam 172 rotates 360 degrees and the magnet 176 faces the Hall IC.
When a voltage is generated at , the aforementioned operation control circuit (not shown) causes motor 28 to rotate 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 an operation button (not shown) for causing the tape 120 to travel at high speed in the direction of arrow 242 from a state of high-speed travel in the direction of arrow 240 shown in the seventh figure is operated, the aforementioned operation control circuit (not shown) moves the electromagnetic coil 232 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 indicated by the arrow 24.
Displaces in 6 directions. 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.
38 are slidably displaced in the direction of the arrow 242, and the fourth
It is brought to the position shown in the figure. Further, the plate 212 follows the displacement of the cam follower 184 and moves as indicated by the arrow 246.
direction and brought to the position shown in FIG. The plate 204 also moves in the direction of arrow 246 from the position shown in FIG. 7 until the elongated hole 204a abuts the shaft 205, following the displacement of the cam follower 184. long hole 20
4 a comes into contact with the shaft 200 , the movement of the plate 204 is restricted, so the pinion 206 rotates around the shaft 205 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 the arrow 244, and the device is once brought to a stopped state by the same operation as the above-described stopping operation from the high-speed traveling state in the direction of the arrow 240. When the triangular cam 172 further rotates beyond 180 degrees and the cam follower 184 moves in the direction of arrow 244, the plate 212 follows the movement of the cam follower 184 and moves in the direction of arrow 244. At this time, the movement of the plate 204 is restricted by the stopper 220 attracted to the electromagnetic coil 232, so the pinion 206 rotates around the shaft 205, and the displacement of the cam follower 184 in the direction of arrow 244 is controlled by the sliding plate 226.
to communicate. This causes the sliding plate 226 to slide in the direction of arrow 246. The displacement of the sliding plate 226 is controlled by the lever 104 via gears 230a and 230b.
The lever 104 is slid in the direction of the arrow 250. When the triangular cam 172 further rotates and rotates 360 degrees, the lever 104 moves to gear arms 96 and 98.
distance from. As the lever 104 is separated, the gear arms 96 and 98 try to rotate in the direction in which the high-speed drive gears 92 and 94 mesh with the gears 18 and 22 of the flywheels 24 and 26 due to the biasing force of the tension spring 100, but the gear arms Since the movement of the gear arm 96 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 is connected to the gear 22 of the flywheel 26 as shown in FIG. mesh together. Triangular cam 17
When the motor 2 rotates 360 degrees and the above-described operation is completed, the magnet 176 faces the Hall IC 180 and a voltage is generated in the Hall IC 180. Then, the aforementioned operation control circuit (not shown) moves the motor 28 in the direction of the arrow 38. While rotating, the electromagnetic coil 2
The power to 32 is cut off. Arrow 38 of motor 28
As mentioned above, the rotational force in the direction is generated by the one-way clutch 3.
6, the rotation of the flywheel 26 is transmitted to the flywheels 24 and 26 by the high-speed drive gear 94.
20 is wound up at high speed.

As described above, the auto-reverse tape recorder of the present invention utilizes the driving force of the motor in the forward direction for tape running, and the driving force of the motor in the reverse direction for switching the tape running mode, so that the motor is used more efficiently. It will improve. In addition, the head board, the first and second pinch roller mechanisms, and the first and second Displacing either the first or second pinch roller mechanism or the first or second idler mechanism using the forward movement of the cam follower at the same time as displacing the idler mechanism between the operating position and the non-operating position. By preventing the displacement of the other and allowing the displacement of the other, reverse and forward modes are realized while running at a constant speed, resulting in a compact and highly operable auto-reversing tape recorder with smooth mode transitions. be able to.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an auto-reverse tape recorder in a stopped state in an embodiment of the present invention;
Fig. 2 is a cross-sectional side view of the main parts of the tape recorder, Fig. 3 is a side view of the main parts of the tape recorder, and Fig. 4 is a plan view showing the process of the tape recorder transitioning from a stopped state to a constant speed running state. , Fig. 5 is a plan view showing the same tape recorder in a constant speed running state, Fig. 6 is a plan view showing the process in which the same tape recorder shifts from a constant speed running state to a high speed running state, and Fig. 7 is a plan view showing the same tape recorder in a constant speed running state. FIG. 8 is a sectional side view of a main part showing the same tape recorder in a constant speed running state, and FIG. 9 is a sectional side view of the main part showing the same tape recorder 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 capstans that are driven to rotate in opposite directions only by the driving force of the motor in the forward direction, and these first and second capstans. , forwarding the tape in cooperation with each of the second capstans,
The first one drives to travel in either direction of reverse.
It has a second pinch roller mechanism and a head that moves toward and away from the tape, a first position in which the head is away from the tape corresponding to a stop mode, and a second position in which the head is in contact with the tape corresponding to a constant speed mode. The head board is movable back and forth between the first and second positions so as to take two positions, and is always biased by a spring in the direction of the first position;
The first and second idler mechanisms transmit data to the second reel stand, respectively, and are capable of linear reciprocating motion by contacting a cam coaxial with a rotating body that is rotationally driven only by the driving force of the motor in the reverse direction. A cam follower, a slide plate that is movable 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, and is moved from a first position to a second position by forward movement of the cam follower. and a differential mechanism that is transferred from the second position to the first position by the backward movement of the cam follower, an electromagnetic means operated by constant speed forward and constant speed reverse operations, and a stopper 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 differential mechanism is moved to the second position by the cam follower; , has a rack that is always engaged with a pinion constituting the differential mechanism, and drives the head board by reciprocating in a differential relationship with the cam follower when the differential mechanism is held at the second position. the first and second pinch roller mechanisms and the first and second idler mechanisms to operate together in response to the movement of the displacement member; the pinch roller mechanism and the first,
A swinging member disposed between a second idler mechanism and a first position and a second position that prevents movement of the first pinch roller mechanism and the idler mechanism in relation to the forward movement of the cam follower. a selection plate movable between a first position and a second position for inhibiting movement of the pinch roller mechanism and the idler mechanism;
a second pinch roller mechanism and an idler mechanism responsive to the displacement member when the selection plate is in the second position; a first pinch roller mechanism responsive to the displacement member when the selection plate is in the second position; a selection mechanism that allows movement of the idler mechanism, and when the constant speed forward mode is selected from the stop mode, the selection plate of the selection mechanism is displaced to a second position in accordance with the forward movement of the cam follower, and the selection mechanism the mechanism is transferred to and held in a second position, and the head board is displaced to the second position in response to the return movement of the cam follower, and at the same time the first pinch roller mechanism and the idler mechanism are displaced to the operating position; When the constant speed reverse mode is selected from the constant speed forward mode, the selection plate of the selection mechanism is returned to the first position in response to the forward movement of the cam follower, and the head board is returned to the first position; The first pinch roller mechanism and the idler mechanism are returned to the non-operating position, and the head board is moved to the second position in response to the return movement of the cam follower.
Although the second pinch roller mechanism and the idler mechanism are simultaneously displaced to the operating position, when the stop mode is selected from the constant speed forward mode, the differential mechanism is activated in response to the backward movement of the cam follower. An auto-reverse tape recorder characterized in that it is configured to return to a first position.