JPS5953620B2 - Recording/playback switching device for recording/playback equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording/reproducing switching device suitable for application to, for example, tape recorders, VTRs, and other recording/reproducing devices.

There have been many inventions of so-called feather touch type mode switching devices in which a plunger solenoid is operated to switch the desired mode by simply touching a feather touch type push button or mode selection switch with a fingertip. .

However, in conventional devices of this type, two flange solenoids are normally used for switching the playback mode and the recording mode, and the structure is complicated.
It also had defects that made it expensive.

The present invention was invented in view of the above-mentioned circumstances, and it is possible to
Recording/reproduction switching allows switching between playback mode and recording mode by simply changing the suction operation time of the plunger solenoid when switching to playback mode and when switching to record mode, while using the same mode switching mechanism. The aim is to provide the equipment.

By configuring in this way, the number of expensive plunger solenoids can be reduced and the structure can be simplified.

A fifth embodiment in which the present invention is applied to a tape recorder will be described below with reference to the drawings.

First, before explaining the configuration, in this embodiment, playback,
Each mode of recording, fast forward, rewind, and stop can be set to FW.
They are written as D, REC, FF, REW, and STOP.

In addition, this device uses an upper chassis and a lower chassis, and a tape running drive system such as a capstan, a pair of reel stands, an idler, and a drive motor is attached to the upper chassis.
The mode switching device described in this embodiment is attached to the lower chassis. In order to make the drawing easier to read, the upper chassis and lower chassis have been removed from the drawing. In addition, this tape recorder has FWD, REC, FF, RE
For example, five feather touch type or touch type mode changeover switches (not shown) are used to change the five modes of W and STOP, and by selectively turning on these mode changeover switches, the above It is configured so that five modes can be selectively switched. Next, the structure of the mode switching device attached to the lower chassis will be explained with reference to FIGS. 1 to 3.

First, numerals 1, 2, and 3 are plunger solenoids (hereinafter simply referred to as plungers). These plungers 1, 2, and 3 are energized in a predetermined combination by selectively turning on the five mode changeover switches, and this causes the suction operation, that is, the suction rods 1a. , 2a, 3a are these double-acting springs 1b.
, 2b, 3b, and is attracted by magnetic attraction force. 5 is capstan,
It is configured to be rotationally driven by the drive motor (not shown).

The device is configured such that when the mode changeover switch (excluding the STOP switch) is selectively pressed, power is supplied, thereby causing the motor to start rotating and the capstan to start driving. There is. Further, a drive gear 6 is fixed to this capstan 5. 8 is a cam gear arranged on one side of the drive gear 6;
The cam gear 8 is integrally formed with a rotating cam 9 on its upper surface and a pair of pins 10a and 10b on its lower surface.

Also, this cam gear 8 has two notches 1 on its circumferential surface.
1a and 11b are formed. Note that the pin 10a,
10b and the notches 11a, 11b are provided at symmetrical positions with respect to the rotating shaft 12 of the cam gear 8.
Reference numeral 13 denotes a conversion lever formed in a substantially L-shape, and is rotatably supported by a fulcrum shaft 14 at its longitudinally central portion.

This conversion lever 13 is biased by a spring 15 to rotate clockwise in FIG.
3a is constantly pressed against the side surface of one end 9a of the rotating cam 9. 16 is an activation lever formed in a SL shape;
The bent portion is rotatably supported by a fulcrum shaft 17.

A pair of arm portions 18a and 18b are integrally formed at one end 16a of the activation lever 16 and are curved in a semicircular arc shape. Note that these pair of arm portions 18a and 18b are
Due to the swinging movement of the activation lever 16 about the fulcrum shaft 17, the pair of pins 10a are moved under the cam gear 8.
. Further, the tip of one arm portion 18b is formed into a hollow shape. Also, this activation lever 16 is supported by a spring 19.
It is rotated counterclockwise in FIG. 1 by . On the other hand, the two plungers 1 and 2 are arranged in parallel and close to each other at the positions shown in the figure. A pair of protrusions 20, 21 are fixed to the tips of the suction rods 1a, 2a of both plungers 1, 2. Note that these protrusions 20 and 21 are arranged close to each other, and the activation lever 1 is moved so as to come into contact with both of these protrusions 20 and 21.
The other end 16b of 6 is extended. Reference numerals 22 and 23 denote a pair of selection levers, which are formed into a nearly magnetic rack shape and are arranged parallel to each other.

Both selection levers 22 and 23 are configured to be slidable in the longitudinal direction while being guided by a long hole and a guide inserted therein, and are moved downwardly in FIG. 1 by springs 24 and 25, respectively. Sliding energized. Also, one end 22a, 23a of these selection levers 22, 23 has a long hole 2.
6, 27 are formed, and pins 28, 29 integrally formed on both the protrusions 20, 21 are connected to the elongated holes 26, 27.
are inserted inside each. Note that both these pins 28,
The tip of 29 is inserted and guided into a pair of elongated holes (not shown) provided in a chassis (not shown). Furthermore, protrusions 30 and 31 are integrally formed on one ends 22a and 23a of both selection levers 22 and 23, respectively. Also, a pair of projections 32, 33 are integrally formed on the other ends 22b, 23b of both selection levers 22, 23, and are stacked one above the other. Reference numeral 35 denotes a detection lever, and this detection lever 35 is disposed above both the selection levers 22 and 23 so as to be almost perpendicular to them.

The detection lever 35 is guided by an elongated hole and a guide inserted therein so as to be slidable in its longitudinal direction, and is urged to slide in the right direction in FIG. 1 by a spring 36. There is. Note that a pin 37 integrally formed on the other end 13b of the conversion lever 13 is in contact with one end 35a of the detection lever 35. Further, an opening 38 is formed at the other end 35b of this detection lever 35;
One inner surface is a pin guide surface 39 bent in a dogleg shape.
is formed. Also, one side 3 of this detection lever 35
5c has both protrusions 30 and 3 of the selection levers 22 and 23.
1, a pair of convex portions 40, 41 and a pair of concave portions 4
2, 43 are formed. 45 is the drive gear 6
This is another cam gear disposed on the opposite side of the cam gear 8.

This cam gear 45 has an eccentric rotary cam 47 eccentric to the rotary shaft 46 on its upper surface, and a rotary shaft 46 on its lower surface.
A concentric disk portion 48 is integrally formed with the cylindrical portion 48. Note that a protrusion 49 is integrally formed on a portion of the circumferential surface of the disc portion 48. Further, this cam gear 45 has a notch 50 formed at one location on its circumferential surface. On the other hand, the plunger 3 is arranged at the position shown in the figure, and a pin 51 fixed to the tip of the suction rod 3a is attached to the suction rod 3a.
It is lightly contacted with the circumferential surface of the disk portion 48 by the spring force of the spring 3b.

Reference numeral 53 denotes a drive lever formed in a nearly L-shape, and its bent portion is rotatably supported by a fulcrum shaft 54.

The drive lever 53 is biased by a spring 55 to rotate in the opposite direction as shown in FIG. ing. A pin 56 is fixed to the lower surface of the center of the drive lever 53, and this pin 56 connects to both the projections 32, 3 of the selection levers 22, 23.
3 can be pushed up in common from the lower side in Figure 1. Reference numeral 58 denotes a mode switching lever, whose central portion in the longitudinal direction is connected to the drive lever 5 by a fulcrum shaft 59.
The other end 53b of 3 is rotatably supported.

A mode switching pin 60 is installed on the upper surface of one end 58a of the mode switching lever 58, and a pin 61 is installed on the lower surface of the other end 58b. Note that this pin 61 is inserted into the opening 38 of the detection lever 35. A coiled spring 62 is wound around the fulcrum shaft 59, and both ends of the coiled spring 62 are engaged with the drive lever 53 and the mode switching lever 58. The coiled spring 62 urges the mode switching lever 58 on the drive lever 53 to rotate counterclockwise in FIG. 1 about the fulcrum shaft 59. Note that the pin 61 is pressed against the pin guide surface 39 of the detection lever 35 due to this rotational bias. A lock lever 64 is rotatably supported by a fulcrum shaft 65, and is supported by a spring 6.
6 in the chronological direction in FIG.

A nearly triangular projection 67 is integrally formed on one side 64a of the lock lever 64. A pin 68 fixed to the lower surface of the other end 53b of the drive lever 53 is configured to engage with and disengage from the protrusion 67 of the lock lever 64. Further, the lock lever 64, which is rotationally biased as described above, is brought into contact with the other end 35b of the detection lever 35 from the left side in FIG. 5 by its tip 64b. Reference numeral 71 denotes a recording/reproducing switching lever, which is configured to be slidable in the longitudinal direction while being guided by a long hole and a guide inserted therein.

The recording/reproducing switching lever 71 is moved to the second position by a spring 72.
In the figure, it is energized to slide downward. A recording/reproducing selection lever 73 is rotatably supported on the recording/reproducing switching lever 71 by a fulcrum shaft 74 . The recording/reproducing selection lever 73 is urged to rotate in the counterclockwise direction in FIG. 2 by a spring 75 that is stretched between the recording/reproducing selection lever 73 and the recording/reproducing switching lever 71. By rotating the recording/reproducing selection lever 73 around the fulcrum shaft 74, one end 73a thereof is configured to be able to move in and out of the movement locus of the pin 61 of the mode switching lever 58 as shown by the chain line in FIG. . In addition, the conversion lever J model is rotatably supported at its longitudinal center by a fulcrum shaft 76.
A groove 78 is formed at one end 77a of the V. A pin 7 integrally formed with the projection 20 of the plunger 1
9 is engaged in the groove 78. A pin 80 is integrally formed on the lower surface of the other end 77b of the conversion lever J/V, and is biased to rotate counterclockwise in FIG. 2 about the fulcrum shaft 74. The selection lever 73 is brought into contact with the pin 80 from above in FIG. 2 by its other end 73b. Reference numeral 82 denotes a recording/reproducing switch for switching the recording circuit system and the reproducing circuit system between a recording state and a reproducing state.

The recording/reproducing switch 82 is configured to be switched by the previous recording/reproducing switching lever 71. That is, when the recording/reproducing switching lever 71 is slid upward as shown by the chain line in FIG.
is pushed up in the same direction, and this switch 82 is switched to the recording state. Note that when the lever 71 is moved back as shown by the solid line in FIG.
The switch 82 is moved back downward in the figure, and the switch 82 is switched to the regeneration state. 86 is a FWD lever, 87 is an FF lever, and 88 is a REW lever.

And these three mode switching levers 86, 87,
88 are arranged close to each other and parallel to each other under the upper chassis. Note that these three levers 86
, 87, and 88 are each configured to be slidable in the longitudinal direction while being guided by a long hole and a guide inserted therein. The three levers 86, 87, and 88 are respectively linked to the FWD travel drive system, the FF travel drive system, and the REW travel drive system in the tape travel drive system provided on the upper chassis. And each of these three levers 86, 87
, 88 are selectively slid upward in FIG.
D, FF, and REW tape runs are performed. The three levers 86, 87, and 88 are configured to be moved back to the position shown in FIG. 1 by the back movement of each of the travel drive systems described above. The mode switching pin 60 implanted on one end 58a of the mode switching lever 58
One end 86a, 87a, 8 of two levers 86, 87, 88
It is inserted on the lower side in FIG. 8a.

Then, this mode switching pin 60 selectively engages one ends 86a, 87a, 88a of these three levers 86, 87, 88 by a mode switching operation described later, and pushes them upward in FIG. . The configuration is such that desired mode switching is performed by this operation. Next, a mode switching operation in the mode switching device described above will be explained.

First, the main operations related to mode switching in this device will be explained with reference to FIG. One reciprocating motion of the stroke S1 is always performed between the steps.

At this time, the forward movement of the detection lever 35 in the force direction of the arrow a is performed by the cam gear 8 and the conversion lever 13, which will be described later, against the spring 36, and the backward movement in the direction of the arrow b is performed by the spring force of the spring 36. let When the detection lever 35 is moved back from the forward position P2 in the direction of arrow b, the stop position of the detection lever 35 is selected by the pair of selection levers 22 and 23. By selecting the stop position of the detection lever 35, the mode switching pin 60 of the mode switching lever 58 is set to the FWD position A, the FF position B, and the REW position C. After this setting, the drive lever 53 drives the mode switching lever 58 in the direction of arrow C, and the mode switching pin 60 selectively drives the three levers 86, 87, 88 of FWD, FF, and REW. FWD, FF,
Switches between REW modes. The REC mode can be changed using the recording/playback switch 82 when changing the FWD mode.
This is achieved by switching to the recording state. Further, each of the FWD, REC, FF, and REW modes is locked by locking the drive lever 53 at its forward position using the lock lever 64. In addition, the above FWD,
When switching from the REC, FF, and REW modes to the STOP mode, by moving the detection lever 35 back and forth once again, the detection lever 35 locks the lock lever 6.
This is achieved by releasing the lock 4 and moving the drive lever 53 back to the back movement position. By the way, the detection lever 35
The above-mentioned stop position selection is performed in the following manner.

First, if it is time to switch to FWD mode, press the detection lever 35.
When the selector lever 23 moves in the direction of arrow d from the backward movement position P1 by a stroke S2 in the direction of arrow a, the selection lever 23 moves in the direction of arrow d,
The protrusion 31 is inserted into the concave portion 4 from above the convex portion 41 of the detection lever 35.
It falls within 3.

On the other hand, the detection lever 35 is once moved forward to the forward movement position P2, and then is moved back in the direction of arrow b. When the detection lever 35 reaches the position P3 indicated by the solid line, the convex portion 41
As a result, the detection lever 35 collides with the protrusion 31 of the selection lever 23, and the detection lever 35 is stopped at the position P3. Further, when switching to the FF mode, when the detection lever 35 moves from the backward movement position P1 in the direction of arrow a by a stroke S3, the selection lever 22 moves in the direction of arrow e, and the protrusion 30 of the detection lever 35 moves in the direction of arrow e. falls into the recess 42 from above the protrusion 40 .

Then, as described above, the detection lever 35, which has once moved forward to the forward movement position P2, is moved back in the direction of the arrow b, and the detection lever 35 is moved back to the position P2 indicated by the one-dot chain line.
4, the selection lever 22 is moved by the convex portion 40.
The detection lever 35 collides with the protrusion 30 of the
It is stopped at 4. Further, when switching to the REW mode, the selection lever 22 is held at the position shown by the solid line, and the selection lever 23 is held at the position shown by the dotted line.

Therefore, the detection lever 35 is not stopped during the backward movement, and after reaching the forward movement position P2 from the backward movement position P1, it is completely moved back to the original return movement position P1. Therefore, the detection lever at this time
The stop position of No. 35 is the return position P1. On the other hand, the mode switching lever 58 is located on the drive lever 53 and is biased to rotate counterclockwise around the fulcrum shaft 59 by a spring 62, and the detection lever 35 is rotated by the pin 61 of the mode switching lever 58. It is constantly pressed against the pin guiding surface 39 of the opening 38.

Therefore, in conjunction with the aforementioned reciprocating movement of the detection lever 35, the mode switching lever 58 is also oscillated once around the fulcrum shaft 59. Then, the detection lever 35 is at the stop position P3.
When the mode switching lever 58 is stopped at , the mode switching pin 60 of the mode switching lever 58 reaches the FWD position A and stops. Similarly, when the detection lever 35 is stopped at the stop position P4 or P1,
The mode switching pins 60 reach the FF position B and the REW position C, respectively, and stop. Next, the actual mode switching operation in this device will be explained with reference to FIGS. 5 to 11.
First, when the FWD, REC, FF, REW, and STOP mode changeover switches are turned on, the operating conditions of the three plungers 1, 2, and 3 are as follows.

In the above table, O and ◎ indicate that the plunger is energized and performs a suction operation.

The symbol "-" indicates that the plunger is not energized. However, in the case of ○, the energization time to the plunger is, for example, O. It is set to 3 to 0.7 seconds, and in the case of ◎, the energization time to the plunger is set to, for example, 0. It is set to 8 seconds or more. Therefore, the plunger is activated only when switching to REC mode.
1 is in suction operation for a long time, and due to the difference in the suction operation time of plunger 1 during REC and FWD, REC
and FWD are selected (identified). Also plunger
3 is the mode switching mutual operation by the mode switching switch (
The FWD, REC, FF, and REW modes can be switched between each other without going through STOP), and the actual switching between the five modes of FWD, REC, FF, REW, and STOP is performed using the plunger. The suction operation is performed by a combination of suction operations 1 and 2. Therefore, FIGS. 1 and 2 show the STOP mode, and the FWD, REC, FF, and REW modes are
It can be switched based on the OP mode.

Note that in this STOP mode, one cam gear 8 faces the drive gear 6 through one notch 11a, and the other cam gear 45 faces the drive gear 6 through a notch 50, and these cam gears 8, 45 are in the driving position. It is held in a non-engaged state with respect to the gear 6. However, one cam gear 8 is connected to the first cam gear by a conversion lever 13 that presses the side surface of one end 9a of the rotating cam 9.
In the figure, it is rotated in direction A, but one pin 1
0a is in contact with the tip of one arm portion 18a of the activation lever 16, thereby preventing the rotation. The other cam gear 45 is rotated clockwise in FIG. By being in contact with each other, the above rotation is prevented.
[FWD Mode Switching Operation] This FWD mode switching operation is shown in FIGS. 5 to 7.

First, when the FWD mode selector switch is turned on, power is supplied and the capstan 5 is driven to rotate counterclockwise in FIG. 5 by the motor. At the same time, the plungers 1 and 3 are energized almost simultaneously (actually, the plunger 3 is slightly delayed). When the plunger 1 is energized, its suction rod 1a is sucked upward as shown in FIG.

However, at this time, the pin 28 only moves within the elongated hole 26 of the selection lever 22 from its lower end position to its upper end position, and does not substantially pull up the selection lever 22. Therefore, the selection lever 22 does not become a suction load for the plunger 1. The suction action of the suction rod 1a causes the protrusion 20 to push up the other end 16b of the activation lever 16, causing the activation lever 16 to rotate clockwise against the spring 19 as shown in FIG.

Then, one arm portion 18a of the activation lever 16 is removed from one pin 10a of the cam gear 8, and at the same time, the other arm portion 18b enters into the rotation locus of the pin 10a.
Then, at this moment, one cam gear 8 moves to the conversion lever 13.
5, and is rotated slightly clockwise as shown in FIG. 5, so that it is engaged with the drive gear 6. Thereafter, the cam gear 8 is driven half a rotation clockwise in FIG. 5 by the drive gear 6. As the cam gear 8 rotates, the other end 9b of the rotating cam 9 pushes the one end 13a of the conversion lever 13.

As a result, the conversion lever 13 resists the spring 15 and the fulcrum shaft 1
4 in the counterclockwise direction as shown by the chain line in FIG. Then, the pin 37 of the conversion lever 13 comes into contact with one end 35a of the detection lever 35, and the detection lever 3
5 to the left in FIG. 6 against the spring 36. As the rotary cam 9 rotates, the conversion lever 13 performs one reciprocating rocking motion, thereby causing the detection lever 35 to perform one reciprocating motion as explained in FIG. 4. By the way, due to the suction of the plunger 1 mentioned above, the pin 28 is inserted into the elongated hole 26.
By moving to the upper end position, one selection lever 22 is held at the position shown in FIG. 6.

On the other hand, since the plunger 2 is not attracted, the other selection lever 23 is urged by the spring 25 to slide downward in FIG. In this state, when the detection lever 35 is moved forward by the stroke S2 explained in FIG. 4, the convex portion 41 comes off to the left of the protrusion 31 in FIG. 6. At that moment, the selection lever 23 is slid downward in FIG. 6 by the spring 25, and the projection 31 enters into the recess 43 from above the projection 41. As a result, as explained in FIG. 4, when the detection lever 35 once reaches the forward movement position P1 shown by the chain line in FIG. It is stopped at a stop position P3 shown by a solid line in FIG.

As a result, the mode switching pin 60 of the mode switching lever 58 is set to the FWD position A. When the naori mug gear 18 rotates half a turn, its pair of notches 11a and 11b
Then, the driving of the cam gear 8 by the drive gear 6 is completed.

At this point, one pin 10a is received by the tip of the other arm 18b of the activation lever 16, and the cam gear 8 is stopped. By the way, after the rotation of the cam gear 8 is stopped, the power to the plunger 1 is cut off.

Then, the suction rod 1a is moved back by the spring 1b as shown in FIG.
As shown in the figure, it is rotated counterclockwise and returned to its original position. As a result, as shown in FIG. 1, the other arm 18b of the activation lever 16 is removed from the pin 10a, and at the same time, the one arm 18a enters into the rotation locus of the pin 10b. At this moment, the cam gear 8 is slightly rotated clockwise by the conversion lever 13, and as shown in FIG. state and is stopped again. At this point, the half rotation of the cam gear 8 is completed, and the conversion lever 13 also completes one reciprocating swinging motion. On the other hand, when the plunger 3 is energized, its suction rod 3a is attracted to the left side as shown in FIG. 5, and its pin 51 is removed from the protrusion 49 of the other cam gear 45.

At this moment, the other cam gear 45 moves to the drive lever 5.
3 and rotated slightly in the chronological direction as shown in FIG. 5, and is engaged with the drive gear 6. Thereafter, the cam gear 45 is driven one rotation clockwise in FIG. 5 by the first drive gear 6. As the cam gear 45 rotates, the eccentric rotating cam 47 pushes one end 53a of the drive lever 53, as shown in FIG.

This causes the drive lever 53 to move against the spring 55 and move the fulcrum shaft 5.
4 in the clockwise direction in FIG. At this time, after the cam gear 45 starts rotating, the eccentric rotating cam 4
7 to actually start rotating the 1 drive lever 53 clockwise, that is, until the eccentric rotating cam 47 is rotated from the position shown in FIG. 1 to the position indicated by the chain line in FIG. The waiting time is mechanically set.

During this waiting time, the operation of setting the mode switching pin 60 to the FWD position A by selecting the stop position of the detection lever 35 described above is almost completed. and,
When the drive lever 53 is rotated clockwise as shown in FIG. 6, the mode switching lever 58 is moved upward as shown in FIG. 7 by the fulcrum shaft 59 attached thereto.

At this time, the mode switching pin 60 is set to F as shown in FIG.
It engages with one end 86a of the WD lever 86 and pushes it upward by a predetermined stroke. As a result, this FWD
The FWD drive system is switched by the lever 86, and the tape recorder is switched to the FWD mode. Note that the energization time of the plunger 3 is short, and the energization is cut off shortly after the drive gear 6 starts rotating the cam gear 45. As a result, the suction rod 3a is moved back by the spring 3b as shown in FIG.
The peripheral surface of the disk portion 48 of No. 5 is contacted again. Then, the drive lever 53 reaches the forward movement position shown in FIG.
0 completely pushes the FWD lever 86 by a predetermined stroke, the pin 68 touches the protrusion 6 of the lock lever 64.
7 and is locked by this lock lever 64.

At this time, as described above, when the detection lever 35 is moved forward to the forward movement position P2 shown by the chain line in FIG. and rotate it counterclockwise about the spindle 65.

As a result, the lock lever 64 is once moved to the unlocking position shown by the chain line in FIG. As the lever 35 moves back, the lock lever 64 is now rotated clockwise in FIG. 6 about the fulcrum shaft 65 by the spring 66. On the other hand, as shown in FIG. 6, immediately after the drive lever 53 starts rotating clockwise by the eccentric rotating cam 47, the pin 5
6 comes into contact with the protrusion 33 of the selection lever 23.

When the drive lever 53 is subsequently rotated clockwise, the pin 56 pushes the protrusion 33 and pushes the selection lever 23 upward against the spring 25 as shown in FIG. As a result, the protrusion 31 of the selection lever 23 is extracted upward from the recess 43 of the detection lever 35. At that moment, the detection lever 35 is released from the stopped state at the stop position P3.
This detection lever 35 is moved back by a spring 36 to a return position P1 shown in FIG. Note that due to this backward movement of the detection lever 35, the protrusion 31 of the selection lever 23 rides on the convex portion 41 again. Further, due to the above-mentioned double movement of the detection lever 35,
The lock lever 64 also returns to the reverse position shown in FIG. 7, that is, the lock position, but in the middle of its return, the pin 68 of the drive lever 53 rides on the protrusion 67 of the lock lever 64, and the lock lever 64 is locked as shown in FIG. - Drive lever 5 at 64
3 is locked. Since the drive lever 53 is locked at the forward movement position shown in FIG.
is also locked at its forward movement position, and the FWD mode becomes locked.

Note that after the drive lever 53 is locked, the cam gear 45 idles. When the cam gear 45 completes one rotation, the notch 50 reaches its initial position, and the driving of the cam gear 45 by the drive gear 6 ends. At this time, the protrusion 49 of the cam gear 45 comes into contact with the tip of the pin 51, and the cam gear 45 returns to its original state and is stopped again. The series of operations related to FWD mode switching is thus completed.

[REC mode switching operation]

This REC mode switching operation is shown in FIGS. 2 and 8.

This REC mode switching operation is essentially the same as the FWD mode switching operation described above, but the REC mode is selected by making the energization time of the plunger 1 longer than when switching to the FWD mode. When the REC mode changeover switch is turned on, power is supplied, the capstan 5 is driven to rotate by the motor, and the plungers 1 and 3 are simultaneously energized.

However, at this time, the energization time of the plunger 1 is set longer than when the FWD mode is switched, and the suction rod 1a is operated for a longer time than when the FWD mode is switched. By the way, when the suction rod 1a of the plunger 1 is attracted, the conversion lever J/MoV is slightly rotated counterclockwise about the fulcrum shaft 76 by its pin 79 as shown by the chain line in FIG.

Then, the recording/reproducing selection lever 73 is moved to the fulcrum shaft 7 by the spring 75.
4 in the counterclockwise direction as shown by the chain line in FIG. As a result, one end 73a of the recording/reproducing selection lever 73 enters within the locus of movement of the pin 61 of the mode switching lever 58.
Then, it is held in that state for a predetermined long time.
Meanwhile, during this time, the same operation as when switching the FWD mode described above is performed, and the drive lever 53 is rotated clockwise about the fulcrum shaft 54 in FIG.
The mode switching lever 58, which has been set to , is moved upward in FIG.

At this time, the pin 61 of the mode switching lever 58 comes into contact with one end 73a of the recording/reproducing selection lever 73, causing it to
Push it upwards as shown. As a result, the recording/reproducing switching lever 71 is pushed upward by the fulcrum shaft 74 of the recording/reproducing selection lever 73 against the spring 72 as shown in FIG. 82 is switched to the recording state and the tape recorder is switched to the REC mode. After the above, the power supply to the plunger 1 is cut off.

Then, due to the double movement of the suction rod 1a, the conversion lever J
The recording/reproducing selection lever 73 is rotated clockwise as shown by the solid line in FIG.
The spring 75 is expanded and rotated clockwise as shown by the solid line in FIG. 2, and its one end 73a is removed from the pin 61, returning to its original state. Note that even when switching the FWD mode mentioned above, the recording/reproducing selection lever 73 is rotated once as shown by the chain line in FIG. 2, but since the suction operation time of the plunger 1 is short, the mode switching lever 58 Immediately after starting to move upward from the position shown in FIG. 6, the recording/reproducing selection lever 73 is returned to the position shown by the solid line in FIG.

Therefore, when switching to the FWD mode, the aforementioned pin 61 does not push up the recording/reproducing selection lever 73 and the recording/reproducing switching lever 71, and the recording/reproducing switching switch 82 is maintained in the reproducing state. [FF mode switching operation] This FF mode switching operation is shown in FIG.

When the FF mode changeover switch is turned on, power is supplied, the motor rotates the capstan 5, and the plungers 2 and 3 are energized almost simultaneously. At this time, the suction rod 2a of the plunger 2 is sucked upward, and the activation lever 16 is rotated clockwise by the protrusion 21 against the spring 19. As a result, the detection lever 35 is reciprocated once in the same way as when switching to the FWD mode. Also, at this time, the pin 29 moves from the lower end position of the elongated hole 27 of the other selection lever 23 to the upper end position due to the suction of the suction rod 2a, and this selection lever 23 is held in the raised position.

However, in this case as well, the pin 29 only moves within the elongated hole 27 and does not substantially pull up the selection lever 23, so that the selection lever 23 does not act as a suction load on the plunger 2.

At this time, when the detection lever 35 is moved forward by the stroke S3 explained in FIG.

At that moment, the selection lever 22 is slid downward by the spring 24, and the protrusion 30 moves from the convex part 40 to the concave part 42.
Go inside. As a result, as explained in FIG. 4, when the detection lever 35 is moved back, the protrusion 3 of the selection lever 22
0, the motor is stopped at the stop position P4, and the mode switching pin 60 of the mode switching lever 58 is set to the FF position B.

Thereafter, the mode switching lever 58 is moved upward by the drive lever 53 in the same way as when switching the FWD mode, so that the mode switching pin 60 engages with one end 87a of the FF lever 87 and Push up the specified stroke.

As a result, the FF travel drive system is switched by the FF lever 87, and the tape recorder is switched to the FF mode.
At this time, when the drive lever 53 is rotated clockwise, the pin 56 pushes the projection 32 of the selection lever 22, pushing the selection lever 22 upward against the spring 24.

As a result, the protrusion 30 of the selection lever 22 is pulled upward from the recess 42 of the detection lever 35, and the detection lever 35 is unlocked at the stop position P4. Note that as the detection lever 35 returns to the return position P, the protrusion 30 of the selection lever 22 rides on the convex portion 40 again. [REW mode switching operation] This REW mode switching operation is shown in FIG.

When the REW mode selector switch is turned on, power is supplied and the motor drives the capstan 5.
is rotationally driven, and the plungers 1, 2, and 3 are simultaneously energized. And at this time, Pransha 1
When both the suction rods 1a and 2a are attracted upwardly, the activation lever 16 is rotated in the clockwise direction by the projections 20 and 21 against the spring 19. As a result, the detection lever 3
5 will be moved back and forth once. Also, at this time, both pins 28,
29 moves from the lower end position to the upper end position of both the long holes 26 and 27 of both selection levers 22 and 23, and these selection levers 29
, 23 are both held in the raised position. Therefore, at this time, the detection lever 35 moves back to the return position P1 and is stopped, as explained in FIG. 4, and the mode switching pin 60 of the mode switching lever 58 is set to the REW position C.

At this time, the mode switching lever 58 is moved upward by the drive lever 53 in the same way as when switching the FWD mode, so that the mode switching pin 60 engages with one end 88a of the REW lever 88 and Push up the specified stroke.

As a result, the REW travel drive system is switched by the REW lever 88, and the tape recorder is switched to the REW mode. [STOP mode switching operation] This STOP mode switching operation is shown in FIG.

This STOP mode switching is performed by the above-mentioned FWD, REC,
This is performed in the middle of each of the FF and REW modes. In each of the above modes, the detection lever 35 is stopped at the stop position P1, and the drive lever 53 is locked by the lock lever 64 at the forward movement position shown by the chain line. When the STOP mode selector switch is turned on in the above state, the plungers 1 and 2 are energized almost simultaneously, and both suction rods 1a and 2a are attracted upward. As a result, with both selection levers 22 and 23 held in the raised position, as in the case of switching to the REW mode,
The detection lever 35 will be reciprocated once. At this time, the detection lever 35 moves to the forward movement position P2 explained in FIG.
When the other end 35b is moved forward, the lock lever 64
The lock lever 64 is rotated counterclockwise about the fulcrum shaft 65 against the spring 66 by pushing the tip 64b of the lock lever 64.

Then, the protrusion 67 of the lock lever 64 engages the drive lever 5.
3, and the drive lever 53 is unlocked. As a result, the drive lever 53 is moved to the fulcrum shaft 54.
It is rotated counterclockwise by the spring 55 around , and is moved back to the return position shown by the solid line. The return movement of the drive lever 53 and the detection lever 35 returns the mode switching lever 58 to its original position. At the same time, the FWD, FF, and REW levers 86, 87, and 88 are returned to their initial positions, and the tape recorder is switched to the STOP mode. After this, the power is cut off and the motor stops. According to the mode switching device described above, 1
1 When switching between IWD, REC, FF, and REW modes, the mode switching lever 58 and mode switching pin 60 are set to F based on the selection of the stop position of the detection lever 35.
WD position A, . FF position B, . After setting one of the REW positions C, the pin 56 of the drive lever 53 pushes up both the selection levers 22 and 23 against the springs 24 and 25 to ensure that the detection lever 35 returns to the return position P1. On the other hand, the forward movement of the detection lever 35 at the time of the next mode change causes the drive lever 53 to be temporarily unlocked at the forward movement position, and then the drive lever 53 is moved forward again. ,FWD,REC,FF,R
It is possible to perform an operation in which each mode of EW can be switched mutually without passing through STOP, a so-called mutual switching operation.

Further, FIG. 12 shows a switch device for preventing malfunctions provided in the above-mentioned mode switching device.

First, 90 is a position detection switch for the cam gear 45, which is constituted by, for example, a micro switch. 91
are FWD, FF, and REW mode switches, which are configured, for example, as leaf-type reversing switches.

Reference numeral 92 denotes a mode setting completion detection switch, which is composed of, for example, a leaf switch.

The position detection switch 90 is switched by a protrusion 97 of a switch operating lever 96 which is rotatably supported around a fulcrum shaft 94 and biased to rotate in the chronological direction by a spring 95. .

Note that this switch operating lever 96 is connected to the cam gear 45.
is pressed against the circumferential surface of the disc portion 48 . Further, the mode switch 91 is configured as a three-contact changeover switch that is switched by a reversal operation about a fulcrum shaft 100 of a reversing lever 99. And the neutral position of the reversing lever 99 is FF.
It is set at mode position B'. The position where the reversing lever 99 is rotated counterclockwise from the FF mode position B' is set to the FWD mode position A', and the position where the reversing lever 99 is rotated clockwise from the FF mode position B' is set to the FWD mode position A'. The position is set as the REW mode position C'.
However, this reversing lever 99 is in FWD mode position A' and R.
It has a structure that allows it to always automatically return to the FF mode position B' from any of the EW mode positions C'. The reversing lever 99 of the mode switch 91 is connected to a switch operating lever 104 which is rotatably supported around a fulcrum shaft 102.
The inverting operation is performed by the bifurcated operating section 105. A groove 106 is formed in the switch operating lever 104, and the pin 61 of the mode switching lever 58 is inserted into the groove 106. Further, the mode setting completion detection switch 92 is switched by the pin 56 of the drive lever 53. According to this switch device, first, in the STOP mode, the switch operating lever 96 rests on the protrusion 49 of the cam gear 45, and the position detection switch 90 is in the OFF state.

Then, at the moment when the above-described mode switching operation of FWD, FF, or REW is started and the cam gear 45 is slightly rotated in the chronological direction, the switch operating lever 96 is rotated in the chronological direction by the spring 95. and falls onto the circumferential surface of the disc portion 48 from above the protrusion 49 .

Then, the protrusion 97 pushes the position detection switch 90,
Switch this to the on state. Further, during the mode switching operation, the mode switching lever 58 is moved to the FWD position A.
, FF position, BlREW position C, and when the drive lever 53 is moved upward, the pin 61 is inserted deep into the groove 106 of the switch operating lever 104.

At this time, when switching to the FWD mode, the pin 61 pushes one needle surface 106a of the V-groove portion 106 and rotates the switch operating lever 104 in the chronological direction. It is rotated clockwise and switched to the FWD mode position A'. Furthermore, when switching to the REW mode, the pin 61 pushes the other slope 106b of the V-groove 106 and rotates the switch operating lever 104 in the counterclockwise direction. It is rotated and switched to the REW mode position C'. Note that when switching to the FF mode, the switch operation lever 104 is not rotated clockwise or counterclockwise by the pin 61. Therefore, the reversing lever 99 is maintained at the FF mode position B'. Further, as described above, the drive lever 53 is moved forward to the forward position shown in FIG. 7, and this is locked by the lock lever 64, thereby completing the mode switching operation and entering the mode setting state. However, just before the mode setting is completed, the pin 56 of the drive lever 53 presses the mode setting completion detection switch 92 to turn it on.

Further, after the above-described series of operations, just before the cam gear 45 completes the one-rotation operation described above, the switch operating lever 96 is pushed up by the protrusion 49 against the spring 95 to its initial state, and the position detection switch is activated. 90 is again switched to the off state.

In the embodiments described above, a half-rotation drive type cam gear 8 having two notches 11A and llb was used as the first cam gear 8 referred to in the present invention. It is also possible to change this cam gear 8 to a one-rotation type cam gear.

Similarly, it is also possible to change the second cam gear 45 referred to in the present invention to a half-rotation drive type cam gear by having two notches. In addition, the activation lever 16, the detection lever 35, and the drive lever 53 referred to in the present invention
, the mode switching lever 58, the recording/reproducing switching lever 71, the recording/reproducing selection lever 73, etc. may be of either a rotation type around a fulcrum or a linear movement type.

In addition, the selection levers 22, 23 and the first and second plunger solenoids 1, 2 for controlling the selection levers 22, 23 in the present invention are 3.
It is also possible to change more than one.

As described above, the present invention operates the activation lever by the suction operation of the plunger solenoid, drives the detection lever in reciprocating motion by the first cam gear, sets the operating position of the mode switching lever by this detection lever, and operates the detection lever. The mode switching lever whose position is set is moved forward by a drive lever driven by a second cam gear to switch between the playback mode and the recording mode, and at this time, the plunger The operation position of the recording/playback selection lever is changed by the suction operation of the plunger solenoid, and the suction operation time of the plunger solenoid is made different between when switching the playback mode and when switching the recording mode. Depending on the time difference, there is a difference in the length of time the upper recording reselection lever is held at a predetermined operating position, and when switching either the playback mode or the recording mode, the mode switching lever is kept at the above operating position. The mode switching lever is engaged with the recording/playing selection lever, and the recording/playing selection lever is operated via the recording/playing selection lever to switch the recording/playing selection switch, thereby selectively switching between the playback mode and the recording mode. It is configured so that it can be switched to.

Therefore, according to the present invention, while using the same mode switching mechanism when switching the playback mode and when switching the record mode, the playback mode and the record mode can be selected based only on the difference in the suction operation time of the plunger solenoid. I can do it.

Therefore, the mechanism as a whole is simple, and the number of expensive plunger solenoids can be reduced.
There is an advantage that it can be obtained at a very low cost.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape recorder, in which Fig. 1 is a plan view in STOP mode, Fig. 2 is a plan view of the same recording/reproduction switching device portion, and Fig. 3 is a plan view of the same recording/reproducing switching device. is an exploded perspective view, FIG. 4 is a plan view explaining the main operation of mode switching, FIGS. 5 to 7 are plan views explaining the FWD mode switching operation, and FIG. 8 is a plan view explaining the REC mode switching operation. 9 is a plan view explaining the FF mode switching operation, FIG. 10 is a plan view explaining the REW mode switching operation, FIG. 11 is a plan view explaining the STOP mode switching operation, and FIG. 12 is a plan view explaining the switch device. FIG. In addition, in the symbols used in the drawings, 1 is a plunger solenoid, 6 is a drive gear, 8 is a cam gear, 16 is a starting lever, 35 is a detection lever, 53 is a drive lever, and 58
The mode switching lever 60 is a mode switching pin, 71 is a recording/reproduction switching lever, 73 is a recording/reproduction selection lever, 77 is a conversion lever, and 82 is a recording/reproduction switching switch.

Claims (1)

[Claims] 1. A drive gear driven by a motor, first and second cam gears having a notch and a cam, an activation lever for starting rotation of the first cam gear by the drive gear, and substantially the above-mentioned a detection lever configured to be driven in reciprocating motion by rotation of the first cam gear;
A drive lever configured to be moved forward by the rotation of the second cam gear by the drive gear, and a mode switching lever whose operating position is set by the detection lever and configured to be moved forward by the drive lever. , a plunger solenoid whose suction operation time is different when switching playback mode and when switching recording mode, a recording/playback switching lever for switching the recording/playback switch, and a recording/playback switch attached to this recording/playback switching lever. The actuation lever is actuated by the suction action of the plunger solenoid to switch the mode, and the operating position of the upper recording reselection lever is also changed when switching the playback mode and when switching the recording mode. Due to the difference in the suction operation time of the plunger solenoid, when switching one of these modes, the mode switching lever is engaged with the upper recording reselection lever, and this mode switching lever is used to select the upper recording reselection lever. A recording/reproducing switching device for a recording/reproducing device configured to operate.