JPH0118489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a playback track control method for a tape recorder, and more specifically, to a method for controlling a playback track of a tape recorder, and more specifically, a method for freely reproducing signals on a magnetic tape in both a bidirectional constant-speed drive state and a high-speed drive state of the magnetic tape. The purpose is to provide a simple device.

It is well known that, in a tape recorder that drives a magnetic tape at a constant speed in one direction, a technique has been disclosed for producing a so-called queue and review operation for reproducing signals even in a high-speed driving state. However, in a tape recorder that drives a magnetic tape in both directions at a constant speed, there is a technology that selects switching of the playback track during constant speed drive and switching of the playback track during high speed drive according to the operation mode of the tape recorder. This became necessary, and it was a technical problem to materialize it with a simple mechanism configuration.

The present invention provides a simple reproduction track control method that solves the above-mentioned problems, and one embodiment thereof will be described below with reference to the drawings.

The drawings show one embodiment of the present invention, and in the drawings,
The capstans 2 and 4 rotate together with flywheels 14 and 16 having gears 6 and 8 and gears 10 and 12 formed on their outer peripheries. A one-way clutch 28 and a pulley 26 are disposed between a drive disk 22 that rotates together with the motor shaft 20 of the motor 18, which rotates in either the normal or reverse direction, and a gear 24 and a pulley 26 that are loosely fitted to the motor shaft 20. 30 is formed. The one-way crack 28 is the arrow 3 of the motor 18.
It is configured to transmit rotation in two directions to the gear 24, and this rotation is further transmitted to the gear train 34a, 34b, 3.
The cam 3 rotates integrally with the gear 36a via the gear 4c.
6b. The one-way clutch 30 is also configured to transmit the rotation of the motor 18 in the direction of the arrow 38 to the pulley 26, which rotation is further transmitted to the flywheels 14 and 16 via the belt 40, and the flywheels 14 and 16 4
2 and 44 directions, respectively. The specific structure of the one-way clutches 28 and 30 was disclosed in a patent application filed in 1973.
Since it is proposed in No.-127556, detailed explanation thereof will be omitted. A rack 52a is formed in a cam follower 52 having pins 50a and 50b that sandwich a cam 36b that is slidably guided by shafts 48a and 48b that are set on a base plate 46. Cam surfaces 60a, 62a, and 64a are formed on plate members 60, 62, and 64 that are slidably guided by elongated holes 54a and 54b, elongated holes 56a and 56b, and elongated holes 58a and 58b formed in the substrate 46, respectively. ing.

Shafts 66, 6 planted on board materials 60, 62, 64
Pinions 72, 74, and 76 are rotatably held by pinions 8 and 70, and are engaged with racks 52a, respectively. Plants 78a and 48 planted on the substrate 46
b, axes 80a and 80b, axes 82a and 82
locking plates 84, 86, which are slidably guided by b;
Cam surfaces 84a, 86a, 88a and bent portions 84b, 86b, 88b are formed on 88, respectively.

Electromagnets 90, 92, 94 are connected to the locking plate 8.
4, 86, 88 bent portions 84b, 86b, 88b
It is fixedly installed on the substrate 46 so as to face the. A shaft 100 is mounted on the rack plate 98, which has a rack 98a that is slidably guided by shafts 96a and 96b set on the base plate 46 and meshes with the pinion 74.
is planted. Shaft 102 planted on substrate 46
The groove portion 104 is slidably guided by the grooves a and 102b.
A shaft 106 is installed on the slide plate 104 having a shape. Elongated holes 110a and 110b are formed in the connecting plate 110, which is rotatably held by a shaft 108 set on the base plate 46.
Shafts 100 and 106 are inserted into a and 110b, respectively.

Rack 114a and 114b are formed on the rack plate 114 on which the shafts 112a and 112b are mounted, and the rack 114a is engaged with the pinion 76. The rotating bodies 116 and 118 are rotatably held by a shaft 120 mounted on the base plate 46, and a one-way clutch 122 is constructed between them, and when the rotating body 116 rotates in the direction of arrow 124, the one-way clutch 122 The rotation of the rotating body 116 is controlled by the rotating body 11.
8. Rotating body 116
A gear portion 116a is formed in the gear portion 116a.
is engaged with the rack 114b of the rack plate 114. A drive plate 128 rotatably held by a shaft 126 mounted on a base plate 46 has a shaft 130 mounted on one end and a toothed portion 128a formed on the other end.
This tooth portion 128a meshes with the pinion 72. A shaft 136 is mounted at one end of a drive plate 134 rotatably held by a shaft 132 mounted on a base plate 46, and a protrusion 134a is formed at the other end, and this protrusion 134a is connected to a slide plate. 104 is inserted into the groove 104a. The connecting plate 138 is rotatably held by shafts 130 and 136 mounted on the drive plates 128 and 134. Substrate 46
Shafts 140a and 140b, shaft 142 planted in
Gears 152 and 154 are rotatably held on shafts 148 and 150 that are mounted on idler plates 144 and 146 that are slidably held on a and 142b. The long holes 160a and 160b formed in the substrate 46 by the planted shafts 156a and 156b and the long holes 160a and 158b
Idler plate 1 slidably held relative to the substrate by being guided by 2a and 162b
Shafts 168 and 17 planted in 64 and 166
0, gears 172 and 174 are rotatably held. Idler plates 144 and 164, idler plates 146 and 166 have idler plates 14
4 and 164, idler plates 146 and 166
Springs 180 and 182 bias the reel mounts 176 and 178 toward the reel stands 176 and 178. Board 4
A link 186 rotatably held by a shaft 184 erected on a shaft 184 is arranged such that one end thereof contacts the drive plate 128 and the other end contacts the idler plate 144. Shaft 188 planted on substrate 46
The link 189, which is rotatably held, is arranged so that one end thereof contacts the drive plate 134 and the other end contacts the idler plate 146. The shaft 19 on which the head 190 is placed and planted on the substrate 46
Shafts 194 and 196 are mounted on a head substrate 192 that is slidably held by 1a, 191b, and 191c. A tension spring 198 is placed between the head 192 and the base plate 46 to bias the head base plate 192 toward the stop position. Links 204 and 206 are rotatably held on shafts 200 and 202 mounted on the substrate 46.

Shafts 208 and 2 mounted on head substrate 192
A tension spring 216 is applied between angles 212 and 214 which are rotatably held at 10 . Pinch rollers 230 and 232 are rotatably held by pinch roller arms 226 and 228, which are rotatably held by shafts 218 and 220 set up on the substrate 46 and have shafts 222 and 224 set up. The switching plate 234, which is slidably held by the shafts 126 and 132, has protrusions 234a and 234b, recesses 234c and 234d, and a groove 234e. A lever 238 rotatably held by a shaft 236 set on the base plate 46 has a protrusion 238a and an elongated hole 238b, and the protrusion 238a fits into the groove 234 of the switching plate 234.
In e, the elongated holes 238b are inserted into the shafts 118a set on the rotating body 118, respectively. Head 19
The switch 240 for switching the track 0 is the switching plate 2.
It is arranged on the board 46 so as to be interlocked with 34. Cam surfaces 242a and 242b and a bent portion 242c are formed on a locking plate 242, which is slidably held by a shaft 236 set on the base plate 46 and shafts 194, 196 set on the head base plate 192. A tension spring 244 is applied between them.

Next, the operation of the above embodiment will be explained.

First, the stopped state of the apparatus shown in FIGS. 1, 2, and 3 will be briefly explained. Head board 192
is held in the stopped position by the biasing force of a tension spring 198. In addition, the shaft 19 installed on the head board
4 is applied to the drive plate 12 by the force of the tension spring 198.
8 and 134, the drive plate 12
8 and 134 are also held in the parked position. When the drive plate 128 is held in the stop position, the idler plate 1
44 is moved by a link 186 against the biasing force of a spring 180, and the gear 152 is moved by a link 186 against the biasing force of a spring 180.
and is held in a position away from the gear 12.
Similarly, when the drive plate 134 is held in the stopped position, the idler plate 146 is moved by the spring 1 by the link 189.
82, and the gear 154 is held in a position away from the reel stand 178 and the gear 8. When drive plates 128 and 134 are held at the stop position, connecting plate 138 comes into contact with bent portion 242c, and holds locking plate 242 at the stop position.

At this time, since the cam surfaces 242a and 242b move the shafts 156b and 158b mounted on the idler plates 166 and 166 against the urging force of the springs 180 and 182, the gears 172 and 17
4 are held at positions spaced apart from reel stands 176 and 178 and gears 10 and 6, respectively.

Next, the operation of running the tape (not shown) will be described, and here the head 190 and the tracks on the tape (not shown) will be defined.

1. Head 190 and tape (not shown) where head 180 records/plays back on tape (not shown) when the tape (not shown) is driven at a constant speed in the recording/playback mode in the direction of arrow 248 The upper track is uniquely determined and is set as the first track, and when the switch 240 selects the first track, the switch 24
0 is in the position shown in FIGS. 1, 2, 5, 7, and 9.

2. When the tape (not shown) is driven at a constant speed in the recording/playback mode in the direction of arrow 246, the head 190 records on/plays back the tape (not shown) and the tape (not shown). The upper track is uniquely determined and is set as the second track, and when the switch 240 selects the second track, the switch 24
0 is in the position shown in FIGS. 11 and 12.

The operation will be explained below based on the above definition.

In the operation of rapidly feeding a tape (not shown) in the direction of arrow 248 or reproducing the first track in the direction of arrow 248 from the stopped state of the apparatus shown in FIGS. 1, 2, and 3, high-speed feeding is performed. When the operating lead (not shown) is operated, the circuit means (not shown)
rotates the motor 18 in the direction of arrow 32, and also applies current to the electromagnet 92. Also, when a fast regenerating control lead (not shown) is operated, this circuit means (not shown) also detects that switch 240 has selected the first track. The rotational force of the motor 18 in the direction of arrow 32 is transmitted to the gear 24 by the one-way clutch 28, decelerated by the gear train 24, 34a, 34b, 34c, and transmitted to the cam 36b formed integrally with the gear 36a. . At this time, one-way clutch 30
are not rotationally engaged and the rotational force of the motor 18 is not transmitted to the pulley 26. Therefore, the flywheels 14, 16 do not rotate.

When the cam 36b rotates in response to the rotational force of the motor 18, the cam follower 52, which moves linearly following the rotation of the cam 36b, is displaced in the direction of arrow 246.
When the cam 36b rotates 180 degrees, it is brought to the position shown in FIG. In addition, the planted shafts 66, 6
The pinions 72, 74, 76 are attached to the rack 5 of the cam follower 52.
2a, they are displaced in the direction of arrow 246 following the displacement of the cam follower 52, and when the cam 36b rotates 180 degrees, it is brought to the position shown in FIG. At this time, since no current is applied to the electromagnetic magnet 94, the cam surface 64a of the plate member 64 connects the bent portion 88b to the electromagnetic magnet 9.
The locking plate 88 is moved in a direction in which the bent portion 88b is separated from the electromagnet 94 against the biasing force of a spring (not shown) biased in the direction 4. Further, at this time, the locking plates 84, 86 move according to the biasing force of a spring (not shown) that biases the bent portions 84b, 86b in the direction of the electromagnetic magnets 90, 92, are in contact with the electromagnetic magnets 90, 92, and the cam surfaces 84a, 86a are in contact with the plate material 6.
0 and 62 cam surfaces 60a and 62a. When the cam 36b further rotates from 180 degrees, the cam follower 52 is displaced in the direction of arrow 248 from the position shown in FIG. 4, and the plate 64 is displaced in the direction of arrow 248 following the displacement of the cam follower 52.

Further, at this time, since no current is applied to the electromagnetic magnet 90, the plate member 60 also follows the displacement of the cam follower 52, and the cam surface 60a has a spring (not shown) that urges the bent portion 84b toward the electromagnetic magnet 90. When the locking plate 84 is moved in the direction in which the bent portion 84b is separated from the electromagnetic magnet 90 and the cam 36b rotates 360 degrees, the plates 60, 6
4 and the locking plates 84, 88 are moved to the position shown in FIG. However, at this time electromagnet 9
2 is energized and the bent portion 86b is attracted to the electromagnetic magnet 92, so that the cam surface 86a locks the cam surface 62a, so the movement of the plate 62 is restricted and the displacement of the cam follower 52 in the direction of arrow 248. do not follow. Therefore, the pinion 74 rotates around the shaft 68 in response to the displacement of the cam follower 52 in the direction of arrow 248, and the rack plate 98 with the rack 98a meshing with the pinion 74 is displaced in the direction of arrow 246 by the pinion-rack mechanism.
Note that this pinion/rack mechanism constitutes a differential mechanism that transmits the movement of the cam follower 52 to the rack plate 98 only when the movement of the plate material is regulated by the locking plate 86, and this structure has a special feature. 1977-
Already proposed in 69555.

The slide plate 104, whose direction of displacement of the rack plate 98 is changed by the link 110, moves in the direction of arrow 248, and when the cam 36b rotates 360 degrees, the apparatus is brought into the state shown in FIG. In FIG. 5, when the drive plate 134 rotates in response to the displacement of the slide plate 104, the idler plate 146 is released from the restriction by the link 189 and is displaced by the biasing force of the spring 182, and the gear 154 moves between the reel stand 178 and the gear 8. engage with. At this time, the movement of the locking plate 242 is restricted because the bent portion 242c is in contact with one end of the drive plate 128, and therefore the gears 172, 174 do not engage with the reel stands 176, 178. Also, drive plate 1
34 rotates, the shaft 194 mounted on the head board 192 is brought from the stop position shown in FIG. 2 to the position shown in FIG. The head 19 is moved from the stop position shown in the figure to the position shown in Figure 6.
0 abuts the tape (not shown). However, at this time, the pinch rollers 230, 232 are not pressed against the capstans 4, 2. Head board 1 at this time
The amount of movement from the stop position of 92 will be explained later. When the cam 36b is rotated 360 degrees from the stop position of the device shown in FIGS. 1 and 3 and brought to the position shown in FIG. 18 in the direction of arrow 38. Arrow 3 of this motor 18
The rotational force in eight directions is transmitted by one-way clutch 30 to pulley 26 and further by belt 40 to flywheels 14 and 16, which are connected to arrows 42 and 44, respectively.
Rotate in the direction. The reel stand 1 receives the rotational force of the flywheel 14 through the gear 154.
78 winds up a tape (not shown) at high speed in the direction of arrow 248, and the head 190, whose first track is selected by switch 240, receives the signal of the first track on the tape (not shown). It becomes playable. Now first tape (not shown)
When the operation button (not shown) that feeds the tape at high speed is operated, the muting circuit (not shown) is activated, and the signal on the tape (not shown) taken out by the head 190 is transmitted to the speaker (not shown). (not shown) cannot be emitted. Furthermore, when a high-speed playback operation button (not shown) is operated, the muting circuit (not shown) does not operate and the first track on the tape (not shown) taken out by the head 190 is played back. The signal is emitted from a speaker (not shown) as a fast-playing sound. At this time, the one-way clutch 28 is not rotationally engaged, so that the rotation of the motor 18 in the direction of arrow 38 is not transmitted to the cam 36b.

Next, from the stopped state of the apparatus shown in FIGS. 1, 2, and 3, an operation button (not shown) is operated to play the tape (not shown) at high speed on the second track in the direction of arrow 248. Circuit means (not shown) then detects that switch 240 has selected the first track and rotates motor 18 in the direction of arrow 32 and energizes electromagnets 92 and 94. The rotational force of the motor 18 in the direction of the arrow 32 is transmitted to the cam 36b by the action of the one-way clutches 28 and 30, but not to the flywheels 14 and 16, as is clear from the above description. When the cam 36b rotates in response to the rotational force of the motor 18 in the direction of arrow 32, the cam follower 52, which moves linearly in response to this rotation, is displaced in the direction of arrow 246. At this time, since current is being applied to the electromagnetic magnet 94, the bent portion 88b of the locking plate 88 is attracted to the electromagnetic magnet 94, as shown in FIG. It engages with surface 64a. Therefore, the plate member 64 is not driven by the displacement of the cam follower 52 in the direction of the arrow 246, and the pinion 76 accordingly rotates around the shaft 70. Therefore, the rack 114a is connected to the pinion 7.
The rack plate 114 that meshes with pinion 7
6, it is displaced in the direction of arrow 248 by the pinion-rack mechanism. Furthermore, this pinion
The rack mechanism constitutes a differential mechanism that transmits the movement of the cam follower 52 to the rack plate 114 only when the movement of the plate 64 is restricted by the locking plate 88. Further, the rotating body 116 has its gear portion 116
a is engaged with the rack 114b, the rack plate 114 is displaced in the direction of the arrow 248, and the arrow 1
Rotates in 24 directions. The rotating body 116 is the arrow 124
When rotated in the direction, the one-way clutch 122 rotationally engages and transmits this rotation to the rotating body 118. When the rotating body 118 rotates, the lever 238 moves to the shaft 236.
The switching plate 234 rotates around the arrow 248.
Displaced in the direction, the switch 240 is toggled. When the cam 36b rotates 180 degrees from the stop position shown in FIGS. 1 and 2 and the above operations are completed, the apparatus is brought to the position shown in FIG. 11 and the switch 240 selects the second track of the head 190. Also, when the cam 36b rotates 180 degrees, the plates 60 and 62
It is brought to the position shown in FIG. 4 by a high speed movement in the direction of arrow 248 and an operation similar to the operation of reproducing the first track at high speed in the direction of arrow 248. Furthermore, while the cam 36b rotates from 180 degrees to 360 degrees, the drive plate 134 rotates in the same manner, and the gear 15
4 engages the reel stand 178 and the gear 8, and the head 190 abuts the tape (not shown). While the cam 36b rotates 360 degrees from the position shown in FIG. 11, the rotating body 116, which transmits the displacement of the cam follower 52 in the direction of the arrow 248 via the pinion 76 and the rack plate 114, rotates in the direction of the arrow 125. One-way latch 122 is not rotationally engaged and thus rotor 118 does not rotate. Therefore, the switching plate 234 and the switch 240 are held in the position shown in FIG. Once the cam 36b has rotated 360 degrees and the above operations have been completed, circuit means (not shown) causes the motor 18 to rotate in the direction of arrow 38. As is clear from what has already been explained, the rotational force of the motor 18 in the direction of the arrow 38 is applied to the flywheels 14, 16 by the action of the one-way clutches 30 and 28.
is transmitted to the cam 36b, but not to the cam 36b.
The reel stand 178 to which the rotational force of the flywheel 14 is transmitted by the gear 154 winds up a tape (not shown) at high speed in the direction of arrow 248, and also connects the head to which the second track is selected by the switch 240. 190 picks up the signal of the second track on the tape (not shown), and a speaker (not shown) emits high-speed reproduction sound.

In the operation of rapidly feeding a tape (not shown) in the direction of arrow 246 or reproducing the first track in the direction of arrow 246 from the stopped state of the apparatus shown in FIGS. 1, 2, and 3, high-speed feeding is performed. When the operation button (not shown) is operated, the circuit means (not shown)
rotates the motor 18 in the direction of arrow 32, and also applies current to the electromagnet 90. Further, when a high-speed playback operation button (not shown) is operated, this circuit means (not shown) further detects that the switch 240 has selected the first track. The rotational force of the motor 18 in the direction of arrow 32 is 1
Due to the action of the directional clutch 28, it is transmitted to the cam 36b, but due to the action of the one-way clutch 30, it is not transmitted to the flywheels 14 and 16.
In response to the rotational force of the motor 18 in the direction of arrow 32, the cam 36b moves from the stop position shown in FIGS. 1 and 3.
Until the cam 36b rotates 180 degrees, the same operations as those described in the high-speed feed in the direction of arrow 248 or the high-speed reproduction of the first track in the direction of arrow 248 are performed, and when the cam 36b rotates 180 degrees, the device operates as shown in FIG. It is brought to the state shown in. Cam 36b is 180
When the cam follower 52 rotates further from the
The plate material 6 is displaced in the direction of arrow 248 from the position shown in the figure.
4 is an arrow 24 following the displacement of the cam follower 52.
Displaces in 8 directions. At this time, since no current is applied to the electromagnetic magnet 92, the plate member 62 also follows the displacement of the cam follower 52, and the cam surface 62a is activated by a spring (not shown) that urges the bent portion 86b toward the electromagnetic magnet 92. The locking plate 86 moves in the direction in which the bent portion 86b moves away from the electromagnet 92 against the biasing force.
move. When the cam 36b rotates 360 degrees, the plates 62, 64 and the locking plates 86, 88 are brought to the position shown in FIG. However, since current is being applied to the electromagnetic magnet 90 at this time, the bent portion 84b is attracted to the electromagnetic magnet 90. As a result, the cam surface 84a becomes the cam surface 6.
In order to lock 0a, the movement of the plate member 60 is restricted and it does not follow the displacement of the cam follower 52.
Therefore, the pinion 72 rotates around the shaft 66 in response to the displacement of the cam follower 52 in the direction of arrow 248, and the drive plate 128, whose teeth 128a are engaged with the pinion 72, is rotated by the pinion-lack mechanism. Note that this pinion/rack mechanism is made of plate material 6.
The movement of the cam follower 52 is restricted by the drive plate 128 only when the movement of the cam follower 52 is restricted by the locking plate 84.
It constitutes a differential mechanism that transmits signals to the When the cam 36b rotates 360 degrees, the device is in the state shown in FIG. In FIG. 7, when the drive plate 128 rotates, the idler plate 144 is released from the restriction by the link 186 and is displaced by the biasing force of the spring 180, and the gear 152 meshes with the reel base 176 and the gear 12. At this time, the movement of the locking plate 242 is restricted because its bent portion 242c is in contact with one end of the drive plate 134. Therefore gear 17
2,174 does not engage with the reel stands 176,178. Further, as the drive plate 128 rotates, the shaft 194 mounted on the head board 192 is brought from the position shown in FIG. 2 to the position shown in FIG. When the head 190 is moved from the stop position shown in FIG. 1 to the position shown in FIG. 8, it comes into contact with a tape (not shown).
The amount of movement of the head board 192 from the stop position at this time is the same as in the case of high-speed feed in the direction of arrow 248 and high-speed reproduction state. When the cam 36b has rotated 360 degrees from the stop position of the device shown in FIGS. 1 and 3 and has been brought to the position shown in FIG.
8 in the direction of arrow 38. This motor 18
The rotational force in the direction of arrow 38 is transmitted to pulley 26 by one-way clutch 30, causing flywheels 14 and 16 to rotate in the directions of arrows 42 and 44, respectively. The reel stand 176 to which the rotational force of the flywheel 16 is transmitted through the gear 152 winds up a tape (not shown) at high speed in the direction of an arrow 246, and the first track is selected by the switch 240. Head 190 is enabled to reproduce the signal on the first track on the tape (not shown). If the operation button (not shown) for feeding the tape (not shown) at high speed is first operated, the muting circuit (not shown) is activated and the tape (not shown) taken out by the head 190 is operated. figure)
The above signal is not emitted from a speaker (not shown). There is also an operation button (not shown) for high-speed playback at the beginning.
is operated, the muting circuit (not shown) is not activated and the signal of the first track on the tape (not shown) taken out by the head 190 becomes a high-speed reproduction sound and is output to the speaker (not shown). (not shown)
emanates from.

At this time, since the one-way clutch 28 is not rotationally engaged, the rotational force of the motor 18 in the direction of arrow 38 is not transmitted to the cam 36b.

Next, from the stopped state of the apparatus shown in FIGS. 1, 2, and 3, an operation button (not shown) is operated to play the tape (not shown) at high speed on the second track in the direction of arrow 246. Circuit means (not shown) detects that switch 240 has selected the first track, rotates motor 18 in the direction of arrow 32, and energizes electromagnets 90 and 94. As is clear from what has already been explained, the rotational force of the motor 18 in the direction of the arrow 32 is applied to the cam 36b by the action of the one-way clutches 28 and 30.
is transmitted to the flywheels 14 and 16.
is not transmitted. When the cam 36b rotates in response to the rotational force of the motor 18 in the direction of arrow 32, the cam follower 52 moves linearly in response to this rotation in the direction of arrow 2.
Displaces in 46 directions. At this time, the electromagnetic magnet 94
11, the bent portion 88b of the locking plate 88 is connected to the electromagnet 9.
The cam surface 88a of the locking plate 88 is attracted to the plate material 6.
It engages with the cam surface 64a of No. 4. As a result, the plate member 64 is not affected by the displacement of the cam follower 52 in the direction of the arrow 246, and the pinion 76 is not affected by the displacement of the cam follower 52 in the direction of the arrow 246.
rotate around. Therefore, the rack plate 114, in which the rack 114a is engaged with the pinion 76, is rotated by the rotation of the pinion 76 and is moved toward the arrow 240 by the action of the pinion/rack mechanism and the differential mechanism described above.
displacement in the direction. Further, since the gear portion 116a of the rotating body 116 is engaged with the rack 114b, the rotating body 116 rotates in the direction of the arrow 124 in response to the displacement of the rack plate 114 in the direction of the arrow 248.

When the rotating body 116 rotates in the direction of arrow 124, 1
Directional clutch 122 rotationally engages and transmits this rotation to rotating body 118.

When the rotating body 118 rotates, the lever 238 moves toward the shaft 2.
Since the switching plate 234 rotates around 36, the switching plate 234
The switch 240 is switched by moving in 48 directions. When the cam 36b rotates 180 degrees from the stop position shown in FIGS. 1 and 2 and the above operations are completed, the device is brought to the position shown in FIG. 11, and the switch 240 is turned.
selects the second track of head 190. Also, when the cam 36b rotates 180 degrees, the plates 60, 62
is brought to the position shown in FIG. 4 by an operation similar to that of high-speed feeding in the direction of arrow 246 and high-speed reproduction of the first track in the direction of arrow 246. Furthermore, while the cam 36b rotates from 180 degrees to 360 degrees, the drive plate 128 rotates in the same manner, the gear 152 engages with the reel stand 176 and the gear 12, and the head 190 is connected to the tape (not shown). ). While the cam 36b rotates 360 degrees from the position shown in FIG.
Since the rotating body 116, whose displacement in eight directions is transmitted via the pinion 76 and the rack plate 114, rotates in the direction of the arrow 125, the one-way clutch 122 is not rotationally engaged, and therefore the rotating body 118 does not rotate. Therefore, the switching plate 234 and the switch 240 are
It is held in the position shown in Figure 1. Cam 36b is 360
Once the above operations have been completed, circuit means (not shown) causes motor 18 to rotate in the direction of arrow 38. The rotational force of the motor 18 in the direction of the arrow 38 is transmitted to the flywheels 14, 16 by the action of the one-way clutches 30 and 28, as has been explained above, but not to the cam 36b. The reel stand 176 to which the rotational force of the flywheel 16 is transmitted through the gear 152 winds up a tape (not shown) at high speed in the direction of the arrow 246, and the second track is selected by the switch 240. The head 190 picks up the signal on the second track on the tape (not shown) and
High-speed reproduction sound is emitted from a speaker (not shown).

Next, when an operation button (not shown) for recording or reproducing a tape (not shown) in the direction of arrow 248 from the stopped state of the apparatus shown in FIGS. 1, 2, and 3 is operated, the circuit means (not shown) is a switch 240
It is detected that the first track corresponding to recording/reproduction in the direction of arrow 248 is selected, and the motor 18 is rotated in the direction of arrow 32, and current is applied to the electromagnetic magnets 90 and 92. As already explained, the rotational force of the motor 18 in the direction of the arrow 32 is applied to the cam 36 by the action of the one-way clutch 28.
transmitted to b. The cam 36b is
Until the device rotates 180 degrees from the stopped state shown in the figure, the same operation as described in the high-speed feed operation in the direction of arrow 248 is performed, and when the cam 36b rotates 180 degrees, the device remains in the state shown in FIG. It will happen.

When the cam 36b further rotates from 180 degrees, the cam follower 52 moves from the position shown in FIG.
The plate member 64 is displaced in the direction of arrow 248 following the displacement of the cam follower 52. However, since current is being applied to the electromagnetic magnets 90 and 92 at this time, the movement of the plates 60 and 62 is restricted and the displacement of the cam follower 52 is restricted, as is clear from the explanation of the high-speed feeding and high-speed reproducing operations. Don't follow. This causes pinions 72 and 74 to rotate about axes 66 and 68, causing drive plates 128 and 134 to rotate, respectively. When the cam 36b rotates 360 degrees, the device is in the state shown in FIG.

When both the driving plates 128 and 134 rotate, the connecting plate 138 that spans them moves the shaft 196 that is planted in the head board 192 against the biasing force of the tension spring 198, as shown in FIG. From this position, bring it to the position shown in Figure 9. As a result, the head substrate 192 is naturally brought to the position shown in FIG. 10, and the head 190 comes into contact with the tape (not shown). Head board 1 at this time
The amount of movement from the stop position of 92 is slightly larger than that in the high-speed forwarding and high-speed reproduction states described above, but this will be explained in detail later.

When the head board 192 moves more than in the case of high-speed feed and high-speed playback operations, the pinch roller arms 226 and 228 try to rotate to the position where the pinch rollers 230 and 232 press against the capstans 4 and 2, but as shown in FIG. As shown in FIG.
Since it is locked by 4a, it does not rotate, and the pinch roller 230 does not come into pressure contact with the kip stan 4. However, since the shaft 224 of the pinch roller arm 228 is inserted into the recess 234d of the switching plate 234, its rotation is not restricted, and the pinch roller 232 is
As shown in FIG. 0, it is pressed against the capstan 2 by the biasing force of the tension spring 216. Also, the drive plate 128
and 134 rotate, the movement of the locking plate 242 is released, and the force of the tension spring 244 moves the locking plate 242 from the position shown in FIG. 2 to the position shown in FIG. Moving. As a result, the shaft 158b installed on the idler plate 166 is released from its restriction, so that the idler plate 116
The gear 174 is moved by the biasing force 82 and meshes with the reel stand 178 and the gear 6. At this time, since the movement of the shaft 156b mounted on the idler plate 164 is restricted by the switching plate 234 as shown in FIG. 9, the gear 172 does not mesh with the reel stand 176 and the gear 10. When drive plates 128 and 134 rotate, idler plates 144 and 146 are released from the restraints of links 186 and 189, but as shown in FIG.
Since the movement of the gears 152 and 154 is restricted by the reel stands 176 and 17
8. Gears 12 and 8 do not mesh. cam 3
6b rotates 360 degrees and the operation described above is completed, circuit means (not shown) directs the motor 18 to arrow 3.
Rotate in 8 directions. Arrow 38 of this motor 18
The rotational force in the direction is transmitted to the flywheels 14, 16 by the action of the one-way clutch 30, causing the flywheels 14, 16 to rotate in the directions of arrows 42, 44, respectively. As a result, the pinch roller 232 pressed against the capstan 2 works with the capstan 2 to transport the tape (not shown) in the direction of arrow 248, and the reel stand 178 receives the rotational force of the flywheel 14 through the gear 174. The head 190 winds up a tape (not shown), and the head 190 whose first track is selected by the switch 240 records or plays back on the first track on the tape (not shown).

Next, when an operation button (not shown) for recording or reproducing a tape (not shown) in the direction of arrow 246 is operated from the stopped state of the apparatus shown in FIGS. 1, 2, and 3, the circuit means ( (not shown) detects that the switch 240 has selected the first track that does not correspond to recording/reproduction in the direction of the arrow 246, rotates the motor 18 in the direction of the arrow 32, and rotates the electromagnetic magnets 90, 92, 94. energize the current. The rotational force of the motor 18 in the direction of the arrow 32 is transmitted to the cam 36b by the action of the one-way clutch 28, as is clear from the above description. When the cam 36b rotates, the cam follower 52, which moves linearly in response to this rotational force, is displaced in the direction of the arrow 246. At this time, since current is being applied to the electromagnetic magnet 94, the bent portion 88b of the locking plate 88 is attracted to the electromagnetic magnet 94, as shown in FIG. Face 64
engage a. Therefore, the plate member 64 is not affected by the displacement of the cam follower 52, and the pinion 76 rotates around the shaft 70 accordingly. This result is easy 11
Rack plate 1 where 4a is engaged with pinion 76
14 is rotated by the pinion 76 and is moved by the arrow 248 by the pinion rack mechanism and the above-mentioned differential mechanism.
displacement in the direction. Further, since the gear portion 116a of the rotating body 116 is engaged with the rack 114b, the rotating body 116 rotates in the direction of the arrow 124 in response to the displacement of the rack plate 114 in the direction of the arrow 248. As rotor 116 rotates in the direction of arrow 124, one-way clutch 122 rotationally engages and transmits this rotation to rotor 118. When the rotating body 118 rotates, the lever 238 rotates around the shaft 236, and the switching plate 234 moves in the direction of the arrow 248.
The switch 240 is switched by being displaced in the direction.
When the cam 36b is in the stopped state shown in FIGS. 1 and 2,
After rotating 180 degrees and completing the above operations, the device will move to the first position.
1, switch 240 selects the second track. Cam 36b is the eleventh
While rotating 360 degrees from the position shown in the figure, the pinion 7 rotates the cam follower 52 in the direction of arrow 248.
6. Rotating body 1 transmitted via rack plate 114
16 rotates in the direction of arrow 125, the one-way clutch 122 is not rotationally engaged and therefore the rotating body 1
18 does not rotate. Therefore, the switching plate 234 and the switch 240 are held in the position shown in FIG. Further, while the cam 36b rotates up to 180 degrees, the plates 60 and 62 are brought into the state shown in FIG. 4 in the same manner as described for the recording or reproducing operation in the direction of arrow 248. When the cam 36b further rotates from 180 degrees and rotates 360 degrees, the device moves as shown by the arrow 248.
The head substrate 192 is moved to the position shown in FIGS. 12 and 13 by an operation similar to that described for the directional recording or reproducing operation, and the head 190 comes into contact with a tape (not shown). At this time, the pinch roller 230 comes into pressure contact with the capstan 4 because the shaft 222 enters the recess 234c of the switching plate 234, but the pinch roller 232 comes into pressure contact with the capstan 4 because the shaft 224 is locked by the protrusion 234b of the switching plate 234. It is held in a position separated from the capstan 2. Furthermore, since the gear 172 is released from the restriction by the locking plate 242, it moves due to the biasing force of the spring 180 and engages with the reel stand 176 and the gear 10.
b is held at a position separated from the reel stand 178 and the gear 6 because its movement is restricted by the switching plate 234. Once the cam 36b has rotated 360 degrees and the operations described above have been completed, circuit means (not shown) causes the motor 18 to rotate in the direction of arrow 38.
The rotational force of the motor 18 in the direction of the arrow 38 is applied to the flywheel 14 by the action of the one-way clutch 30.
16, and the flywheels 14 and 16 are rotated in the directions of arrows 42 and 44, respectively. The pinch roller 230 pressed against the capstan 4 cooperates with the capstan 4 to transport the tape (not shown) in the direction of arrow 246.The reel stand 176, to which the rotational force of the flywheel 16 is transmitted by the gear 172, transfers the tape (not shown) to the tape. The head 190 winds up the tape (not shown) and selects the second track by the switch 240.
record or play back tracks.

Next, the stopping operation will be explained. Figure 3, 1st
When an operation button (not shown) for bringing the device from the recording or reproducing state in the direction of arrow 248 (forward direction) shown in FIG. While rotating in the direction of arrow 32, electricity to the electromagnetic magnets 90 and 92 is cut off. The rotational force of the motor 18 in the direction of the arrow 32 is transmitted to the cam 36b by the action of the one-way clutch 28, as is clear from the above description. While the cam 36b rotates up to 180 degrees, the cam follower 52 is rotated by the rotation of the cam 36b.
is displaced in the direction of arrow 246, and pinions 72, 74 rotate about shafts 66, 68. pinion 72
When the drive plate 128 rotates, the drive plate 128 rotates about the shaft 126 in response to this rotation and is brought to the stop position shown in FIGS. 1 and 2. Further, when the pinion 74 rotates, the rack plate 98 is displaced in the direction of arrow 248, and this displacement is transmitted to the drive plate 134, which is rotated about the shaft 132 as shown in FIGS. 1 and 2. It is brought to the stop position shown in the figure.

When the drive plates 128, 134 are brought to the stop position, the head base plate 192 is held at the stop position by the biasing force of the tension spring 198, and the pinch roller 232 is separated from the capstan 2. Further, since the connecting plate 138 comes into contact with the bent portion 242c, the locking plate 242 is moved to the stop position against the biasing force of the tension spring 244. As a result, the idler plate 166 moves against the biasing force of the spring 182, so that the idler 174 moves between the gear 6 and the reel stand 17.
Move away from 8. One drive plate 128 and 134
When the is brought to the stop position, the idler plate 14
4 and 146 resist the biasing force of springs 180 and 182 by links 186 and 189,
The idlers 152 and 154 are connected to the reel stand 176,
It is held in a position spaced apart from gear 12 and reel stands 178 and 8. The cam 36b further rotates from 180 degrees, and the cam follower 52 is displaced in the direction of arrow 248. At this time, electromagnets 90 and 9
Since no current is applied to 2, the plates 60 and 62 follow the displacement of the cam follower 52 and follow the arrow 2.
It is displaced in 48 directions. Therefore, the locking plates 84 and 86 are fixed to the bent portions 84b and 86 by the action of the cam surfaces 60a and 62a of the plates 60 and 62.
b moves in a direction away from electromagnets 90 and 92. When the cam 36b rotates 360 degrees to bring the device into the state shown in FIGS. 1 and 2, circuit means (not shown) de-energizes the motor 18 and the stopping operation is completed.

Next, the amount of movement of the head substrate 192 in high-speed forwarding or high-speed reproducing operation and recording or reproducing operation will be explained. In FIGS. 14, 15, and 16, the distance from the center of the reel stands 176, 178 to the head 190 is H at the stop position of the device, A in the high-speed feed or high-speed playback state, and B in the recording or playback state. . Arrow 246 shown in FIG.
Drive plate 12 in the direction of high-speed feed or high-speed regeneration operation.
8 rotates, this displacement causes the shaft 194 (H
-Move by A). This is head 19 at this time
This is the amount of movement from the zero stop position. This time axis 19
6 also naturally moves (HA). However, the amount of movement of the center portion 138a of the connecting plate 138 at this time is CE(HA)/2CD=E(HA)/2D, so the center portion 138a of the connecting plate 138 is separated from the shaft 196. Therefore, the amount of movement of the head 190 from the rest position in the high-speed feed or high-speed playback operation in the direction of arrow 246 is the amount by which the drive plate 128 moves the shaft 194. Further, from the above explanation, it can be easily inferred that in high-speed feeding or high-speed reproducing operation in the direction of arrow 248, the amount by which the drive plate 134 moves the shaft 194 is the amount by which the head 190 moves from the stop position.

Next, in a recording or reproducing operation, the drive plates 128 and 13
4 rotate, the center part 1 of the connecting plate 138
The amount of movement of 38a from the stop position is E(HA)/D, and at this time, the center portion 138a of the connecting plate 138
moves shaft 196.

The amount of movement E(H-A)/D becomes the amount of movement of the head 190 from the stop position (H-B). From the above, since E(H-A)/D>(H-A), the amount of movement of the head 190 from the stop position during recording or playback operation is greater than that during high-speed forwarding or high-speed playback operation. is clear, and the difference is generally set at 1 mm to 1.5 mm. Also, this difference is E(H-A)/D: The value of the ratio of (H-A) is E/D
From this, it can be seen that it can be set arbitrarily by changing the values of E and D. Note that the electromagnets 90, 92, 94 in this embodiment are capable of locking the plate materials 60, 62, 64 even with an extremely small adsorption force.
94 consumes less power, making it possible to save energy in the device.

As explained above, the playback track control system for the tape recorder of the present invention is such that when switching the running direction of the magnetic tape with the constant speed running motor, the electromagnetic magnet 94 electromagnetically regulates the displacement of the corresponding plate member 64. Therefore, the corresponding switching plate 2
34 receives the driving force of the motor 18, and the switch 2
40 depending on the running direction of the tape,
When the electromagnetic magnets 90 and 92 are used to switch the running direction in the high-speed running mode, the switching plate 234 maintains its position regardless of the operation of the electromagnetic magnets 90 and 92, and the switch 240 keeps the track on the tape selected in that state. Therefore, a desired signal on the tape can be reproduced in both the bidirectional constant-speed drive state and the high-speed drive state of the magnetic tape. In other words, in the constant speed running mode of the magnetic tape, the playback track is uniquely determined by a switch linked to the switching plate that determines the running direction, resulting in so-called reverse playback, and in the high speed running mode, the above-mentioned constant speed The so-called cue mode and review mode can be produced in any direction of drive mode, and has the excellent effect that a tape record having such functions can be provided with a simple mechanical configuration.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the stopped state of the device, FIG. 2, FIG. 3, and FIG.
The figure is a plan view of the main part, FIG. 4 is a plan view of the main part showing a state in the middle of operation mode switching, FIGS. 5 and 6 are plan views of the main part showing a fast forward state, FIGS. 7 and 8, 1st
Fig. 5 is a plan view of the main part showing the rewinding state, Figs. 9, 10, and 16 are plan views of the main part showing the forward recording/playback state, and Fig. 11 shows the tape running direction switching operation. 12 and 13 are plan views of main parts showing recording and reproducing states in the reverse direction;
18 is a side sectional view of the main part showing the structure of this embodiment, and FIG. 19 is a plan view of the main part. 2, 4... Capstan, 14, 16... Flywheel, 18... Motor, 28, 30... One-way clutch, 36b... Cam, 52... Cam follower, 60, 62, 64... Plate material, 72, 7
4, 76... Pinion, 84, 86, 88... Locking plate, 90, 92, 94... Electromagnetic magnet, 1
14... Rack plate, 116, 118... Rotating body,
122...One-way clutch, 128, 134...
Drive plate, 138... Connection plate, 144, 146...
Idler plate, 152, 154... Gear, 164,
166... Idler plate, 172, 174... Gear, 176, 178... Reel stand, 190... Head, 192... Head board, 194, 196...
...shaft, 230, 232 ... pinch roller, 234
...Switching plate, 238... Lever, 240... Switch, 242... Locking plate.

Claims (1)

[Claims] 1. In a tape recorder that uses the driving force of a motor to switch between forward and reverse tape running modes, a cam driven by the motor, a cam follower linked to the cam, and a tape recorder that switches between forward and reverse running modes of the tape in constant speed running mode. a switch plate that determines the running direction; a switch that selects a track to be played on the tape in conjunction with the switch plate; and a switch that operates in a differential relationship with the cam follower and the switch plate through a rack and pinion mechanism; a first differential member disposed corresponding to the switching plate; and a first differential member disposed corresponding to the first differential member, and a position between a position where the first differential member is locked and a position where the first differential member is not locked. a displaceable first locking member; a first electromagnetic device disposed corresponding to the first locking member and selectively holding the locking member in the locking position by electromagnetic force; A drive plate for driving the tape in the forward or reverse direction in a high-speed tape running mode, and a drive plate that maintains a differential relationship with the cam follower and the drive plate through a rack and pinion mechanism, and corresponds to the drive plate. The second
a second locking member disposed corresponding to the second differential member and movable between a position where the second differential member is locked and a position where the second differential member is not locked; a second electromagnetic device disposed corresponding to the second locking member and selectively holding the second locking member in the locking position by electromagnetic force; When switching the traveling direction in the fast traveling mode, the first electromagnetic device electromagnetically selects and regulates the displacement of the first differential member corresponding to the displacement of the first differential member, so that the corresponding switching plate changes. When the switch is switched, but when the second electromagnetic device changes the running direction in high-speed running mode, the switching plate maintains its position regardless of the operation of the second electromagnetic device, and the track selected by the switch remains in that state. A playback track control method for a tape recorder, characterized in that the playback track control method is configured to maintain the playback track of a tape recorder.