JP2600177B2 - Reel base rotation drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field of Use B Summary of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Function G Embodiment G ₁ Outline of the operation of the tape traveling drive system and the tape recorder description (FIGS. 1 and 2) description of the structure of G ₂ mode switching mechanism described in (FIG. 5-Figure 8B) G ₃ stop mode (Figure 3, Figure 4, Figure 7, second 8B
Figure) Description of selection operation of the G ₄ forward and reverse (Figure 3,
Figure 4, Figure 8A-Fig. 10) G ₅ playback (recording) Description of switching operation of the mode (FIG. 3, FIG. 4, FIG. 10, second 11B view) G ₆ music selection mode selecting operation Explanation (Fig. 3, Fig. 4, Fig. 11
A view-FIG. 12B) G ₇ described switching operation of the fast-forward mode (Figure 3, Figure 4,
Figure 13, second 14C view) Description of the operation of switching to the G ₈ rewinding mode (Figure 3, Figure 4,
FIGS. 14A to 15C) H Effect of the Invention A Industrial Field of the Invention The present invention is most suitable for application to a rotary drive of a reel stand in a tape recorder, for example, and in particular, swinging of a switching lever. The present invention relates to a reel base rotation drive device that selectively engages a driving rotary body with one of a pair of reel bases.

B. Summary of the Invention The present invention is configured such that a switching lever is swung in accordance with mode switching, and a driving rotary body supported by the switching lever is selectively engaged with one of a pair of reel stands. In the rotation drive device of the reel base, the switching lever is pressed and urged by using the elasticity of the belt stretched between the pulley of the driving rotating body and the pulley of the motor to apply elasticity to the cam portion for mode switching. With this configuration, the switching lever can be pressed and urged to always contact the cam portion without providing a special dedicated urging spring to the switching lever.

C Prior Art Conventionally, as a rotary drive of a reel base in a tape recorder or the like, for example, one of a pair of reel bases is selectively rotated and driven by a drive rotating body in a fast-forward mode and a rewind mode. The driving rotary body is supported by a swingable switching lever, and the switching lever is swung according to the mode switching to selectively engage the driving rotary body with one of the two reel bases. There was something I tried to do.

In the above device, the switching lever is driven by a mode switching cam portion or the like in accordance with the mode switching. At this time, the switching lever is provided with a special dedicated biasing spring, and the spring force of the spring is used. The switching lever is always in contact with the cam portion or the like.

D Problems to be Solved by the Invention However, in the structure in which the switching lever is driven by the mode switching cam portion or the like to selectively engage the driving rotating body with one of the pair of reel stands, As described above, a special biasing spring is required for the switching lever, so that the number of parts and the number of assembling steps are increased, and the structure is complicated.

Therefore, the present invention is such that the switching lever can be pressed and urged so as to always contact the cam portion without providing a special dedicated urging spring to the switching lever.

E Means for Solving the Problems The present invention provides a switching lever which can swing freely, and which is supported by the switching lever and is selectively engaged with one of a pair of reel stands to drive the reel stand. A driving rotating body to be driven, a pulley rotatably provided on the switching lever, an elastic belt wound around the pulley and a driving pulley of the motor, and the switching lever in accordance with mode switching. A toothless gear having a cam portion for swinging, a gear that engages with the toothless gear rotated by an initial rotational force, and drives the toothless gear in accordance with the mode switching; And a blocking mechanism that respectively engages with the pair of reel bases and the swingable switching lever to prevent the rotation and the swing at the same time. Let me release A drive unit for driving the reel base so as to be movable, to drive the driving rotary body by the motor and via the belt, and to press the switching lever against the cam portion of the toothless gear by the elasticity of the belt; Was configured.

The present invention will be described with reference to the reference numerals of the embodiments. The pulley (FR pulley 17) of the driving rotating body (FR driving gear 31) supported by the switching lever (FR switching lever 80) and the pulley (FR pulley 17) of the motor 18 Between the drive pulley 19), a belt 20 for rotationally driving the driving rotary body is stretched, and the switching lever is pressed and urged by the pressing force P due to the elasticity of the belt 20,
The switching lever comes into elastic contact with the cam portion 150 for mode switching. Therefore, the belt 20 exhibits both the function of transmitting the rotation of the motor 18 to the driving rotating body and the function of pressing and biasing the switching lever, and it is necessary to provide the switching lever with a special dedicated biasing spring. There is no.

G Embodiment Hereinafter, an embodiment in which the present invention is applied to a reverse type tape recorder using a compact cassette will be described with reference to the drawings.

G ₁ First, the schematic operation of the tape traveling drive system and the tape recorder will be described with reference to FIG. 1 and FIG.

FIG. 1 and FIG. 2 show a tape running drive system of the tape recorder. A pair of left and right reel stands 2 and 3, capstans 4 and 5, pinch rollers 6 and 7, a recording / reproducing magnetic head 8, and the like are provided on an upper portion of the chassis 1. When the tape cassette 10 is mounted on the chassis 1, the reel hubs 11 and 12 are engaged with the reel bases 2 and 3, and the magnetic tape 13 is wound around the capstans 4 and 5 and the magnetic head 8. Next, capstan pulleys 15, 16 fixed to the lower ends of the capstans 4, 5 and serving also as capstan flywheels are provided at the lower portion of the chassis 1.
FR pulley 17 for fast-forward and rewind, 1 serving as a rotational drive source
Two motors 18 are provided. And each of these pulleys
A single elastic belt 20 is stretched between 15, 16, 17 and the drive pulley 19 of the motor 18. On the other hand, reel base gears 22 and 23 are formed on the outer periphery of the reel bases 2 and 3 mounted on the upper portion of the chassis 1, and near the reel bases 2 and 3, an F for forward reproduction (recording) is provided. A drive gear 24 and an R drive gear 25 for reverse reproduction (recording) are provided. Gears 26 and 27 that are coaxially and integrally rotated are provided below the F drive gear 24 and the R drive gear 25, and these gears 26 and 27 are gears 28 formed on the capstan pulleys 15 and 16, 29 is always engaged. A reverse gear 30 is always engaged with the reel base gear 22 of the reel base 2, and an FR drive gear 31 for fast-forward and rewind is provided between the reverse gear 30 and the reel base gear 23 of the reel base 3. Is provided. The FR drive gear 31 is coaxially and integrally rotated with the lower FR pulley 17.

Next, FIG. 2 (however, this shows the stop mode)
When the drive pulley 19 of the motor 18 is driven to rotate in the direction of arrow a, the belt 20 causes the capstan pulley 1 to rotate.
5, 16, and the FR pulley 17 are driven to rotate in the directions of arrows b, c, and d, respectively. When the forward reproduction (recording) mode is selected by a mode switching mechanism described later, the gear 26
Is moved inward in engagement with the gear 28, and F
The drive gear 24 is engaged with the reel base gear 22 of the one reel base 2. At the same time, the magnetic head 8 is
And the pinch roller 6 is pressed against one of the capstans 4. As a result, one of the reel bases 2 is driven to rotate in the direction of arrow e, and the magnetic tape 13 enters a forward reproduction (recording) mode in which it runs in the direction of arrow f, and the magnetic head 8 performs forward reproduction (recording).
Further, when the reverse playback (recording) mode is selected, the gear 27 is moved inward in a state of engagement with the gear 29, and the upper R drive gear 25 is engaged with the reel base gear 23 of the other reel base 3. Are combined. At the same time, the magnetic head 8 comes into contact with the magnetic tape 13 and the pinch roller 7 is pressed against the other capstan 5. As a result, the other reel base 3 is driven to rotate in the direction of arrow g, and the magnetic tape 13 enters a reverse reproduction (recording) mode in which the magnetic tape 13 runs in the direction of arrow f ', so that the magnetic head 8 performs reverse reproduction (recording).

On the other hand, when the fast-forward mode is selected, the FR drive gear 31 rotated integrally with the FR pulley 17 is engaged with the reverse gear 30. As a result, one of the reel bases 2 is driven to rotate at high speed in the direction of arrow e, and the magnetic tape 13 enters a fast-forward mode in which it runs at high speed in the direction of arrow f. When the rewind mode is selected, the FR drive gear 31 is engaged with the reel base gear 23 of the other reel base 3. Thereby, the other reel base 3
Is rotated at a high speed in the direction of arrow g, and the magnetic tape 13 enters a rewind mode in which the magnetic tape 13 runs at high speed in the direction of arrow f '.

When the fast-forward mode and the rewind mode are set, the tape recorder can select a switching state and a non-switching state, respectively, for the fast-forward mode and the rewind mode. It is configured to be able to set the mode passage (pass).

The tape recorder has a so-called music selection function of detecting a recorded portion by performing fast-forward and rewind while the magnetic head 8 is lightly in contact with the magnetic tape 13. The music selection mode and the rewind music selection mode can be selected.

G ₂ Next, the structure of the mode switching mechanism will be described with reference to FIGS. 5 to 8B.

First, in FIG. 5 and FIG.
Is constituted by a reversing type magnetic head which is selectively reversed in accordance with the running direction of the magnetic tape 13, and is attached to the center of the rear end of a substantially T-shaped head substrate 40. The head substrate 40 is configured to be able to reciprocate in the directions of arrows h and h 'at the upper portion of the chassis 1 and is urged in the direction of arrow h' by a torsion coil spring 41 stretched between the head substrate 40 and the chassis 1. I have. A driven pin 42 is fixed to the lower surface of the front end of the head substrate 40, and the pin 42 is inserted into an elongated hole 43 formed in the chassis 1 and protrudes downward. A protruding piece 44 is formed on one side of the center of the head substrate 40 to protrude downward.

Next, as shown in FIGS. 5 and 8B, one plunger solenoid 50 is disposed at the lower portion of the chassis 1. The pin 61 of the control lever 60 is engaged with the suction rod 50a of the plunger solenoid 50. This control lever
Numeral 60 denotes arrows i, i 'by a shaft 62 provided on the chassis 1.
It is pivotally supported so as to be rotatable in the direction. And control lever 60
A pressing portion 63, a long hole 64, and a locking portion 65 protruding downward are integrally formed on the lower portion. The control lever 60 is integrally formed with a protruding portion 66 protruding upward. The protruding portion 66 is formed by a forward movement of the control lever 60 in the direction of arrow i by a notch hole 67 formed in the chassis 1 (see FIG. 7). The protruding piece 44 of the head substrate 40
It is configured to be inserted to the rear side of.

Next, as shown in FIGS. 5 and 8B, a brake member 70 is disposed below the chassis 1 so as to be reciprocally movable in the directions of arrows j and j '. A pair of engaging claws 71, 72 are integrally formed on both left and right ends of the brake member 70, and these two engaging claws 71, 72 are inserted into long holes 73, 74 formed in the chassis 1 and project upward. Have been. As shown in FIG. 7, when the brake member 70 moves back in the direction of arrow j ', the engagement pawls 71 and 72 are provided with tooth portions 75 and 76 formed on the lower surfaces of the reel bases 2 and 3, respectively. Each is configured to be engaged. A pressed portion 77 pressed by the pressing portion 63 of the control lever 60 is formed integrally with the brake member 70. Further, an engagement portion 78 formed of a concave portion is formed substantially at the center of the brake member 70.

As shown in FIGS. 5 and 8A, the FR switching lever 80 for fast-forward and rewind is located below the brake member 70.
Is arranged. The FR switching lever 80 rotatably supports the FR pulley 17 and the FR drive gear 31 which are integrally rotated, and is swingably movable in the directions of arrows k and k ′ by a shaft 81 provided on the chassis 1. It is pivoted. by the way
A shaft 81 pivotally supporting the FR switching lever 80 is biased to one side, and the FR pulley 17 of the FR switching lever 80 is attached to the belt 20.
The FR switching lever 80 is urged in the direction of arrow k 'by the pressing force P due to the elasticity of the belt 20. At substantially the center of the FR switching lever 80, an engaged portion 82 formed of a projection engaged with the engaging portion 78 of the brake member 70 is integrally formed, and the engaged portion 82 is By being released from 78, the FR switching lever 80 can swing in the directions of arrows k and k ', and the engaged portion 82
78 When the FR switch lever 80 is in the neutral position N
It is configured to be held in a fixed state. Also FR
A driven pin 83 projecting upward is integrally formed at the tip of the switching lever 80. Reference numeral 84 denotes a circular hole formed in the chassis 1.

Next, as shown in FIGS. 5 and 8B, a selection slider 90 is arranged at the lower portion of the chassis 1 so as to be reciprocally movable in the directions of arrows l and l '. The selection slider 90 is formed integrally with a pair of left and right pressing portions 91 and 92 and a projection 93 projecting downward. The control lever 60, the brake member 70, and the selection slider 90 have a
Arrows i ', j' respectively by two torsion coil springs 94
And a return bias in the l 'direction. On the lower rear side of the chassis 1, a switching slider 100 is slidably disposed between a forward position in the direction of arrow m and a reverse position in the direction of arrow m '. The sliding of the switching slider 100 causes the magnetic head 8 to be selectively reversed, and the F driving gear 24 and the pinch roller 6 or the R driving gear 25 by both ends 100a and 100b of the switching slider 100.
And the movement of the pinch roller 7 is selectively restricted. A long hole 101 is formed in the center of the switching slider 100. And this switching slider 100
A switching lever 110 is provided between the control lever 60 and the control lever 60. The switching lever 110 is formed integrally with a pair of front and rear fulcrum pins 111 and 112 projecting upward and a pair of left and right pressed parts 113 and 114. The fulcrum pin 111 is inserted into the long hole 64 of the control lever 60 and inserted into the long hole 115 of the chassis 1, and the support pin 112 is inserted into the long hole 101 of the switching slider 100. Accordingly, the switching lever 110 is configured to be rotatable around the fulcrum pin 111 or the fulcrum pin 112 in the directions of arrows n and n '. The pressed portions 113 and 114 of the switching lever 110 are configured to be selectively pressed by the pressing portions 91 and 92 of the selection slider 90.

Next, as shown in FIGS. 5 and 8A, a toothless gear 120 is rotated by a shaft 125 provided on the chassis 1 at the lower center of the chassis 1 and below the control lever 60, the selection slider 90, and the like. It is freely pivoted. A first missing tooth portion 121, a second missing tooth portion 122, and a third missing tooth portion are provided on the outer periphery of the missing tooth gear 120.
123 and a fourth missing tooth portion 124 are formed. The toothless gear 120 is configured to be intermittently driven to rotate in the direction of arrow o by a drive gear 126 formed at the upper center of the one capstan pulley 15. As shown in FIGS. 6 and 8B, a first lock claw 13 is provided near the outer peripheral portion of the upper surface of the toothless gear 120 (the surface facing the chassis 1).
1, a second lock claw 132, a third lock claw 133, and a fourth lock claw 134 are integrally formed, and these are the control lever 6
The configuration is such that the lock section 65 of 0 is brought into contact with the selection section. In order to drive the pins 42 of the head substrate 40, a first radius having a constant radius from the center is provided on the upper surface of the toothless gear 120.
, A second cam portion 142 having a radius gradually increasing continuously from the first cam portion 141, and a third cam portion having a slightly smaller radius continuing from the second cam portion 142 143 or one piece. A cutout portion 144 is formed in the third cam portion 143, and the third cam portion 143 and the first cam portion 141 are formed.
A notch 145 is formed between the two. Also missing gear 1
In the vicinity of the central portion of the upper surface of 20, a projection 93 of the selection slider 90 is provided.
The protrusion 146 for pressing the pressure is integrally formed.

On the other hand, as shown in FIG. 5 and FIG.
A cam portion 150 for driving the pin 83 of the FR switching lever 80 is integrally formed on the lower surface of the lever. A projection 151 for setting the fast-forward mode is provided on a portion outside the cam portion 150.
Are integrally formed. A first passage s is formed outside the protrusion 151, and a second passage t is formed between the protrusion 151 and the cam 150. Also protrusion 15
A guide portion 152 is integrally formed on the front side of 1. A spring 153 for selecting a passage made of a torsion coil spring is mounted inside the cam 150, and a free end 153a of the spring 153 is provided between the cam 150 and the guide 152, that is, the first passage s and the first passage s. 2
Projecting from a branch portion with the passage t. Also cam part 15
A recess 154 for setting the rewind mode is formed in a part of 0. Further, a first pin 161, a second pin 162, a third pin 163, and a fourth pin 1
64 are integrally formed. And each pin 161, 162, 163
And 164 are torsion coil springs 165 attached to chassis 1
The cam gear 120 is selectively pressed to apply an initial rotational force in the direction of arrow o to the cam gear 120.

G ₃ Next, FIG. 3, FIG. 4, FIG. 7 to FIG.
The stop mode will be described.

First, in the stop mode, the plunger solenoid 50 is turned off. As shown in FIG. 8B, the control lever 60 is moved back in the direction of the arrow i ', and the first lock claw 131 of the toothless gear 120 is brought into contact with the lock portion 65, so that the toothless gear 120 is moved to the second position. One missing tooth portion 121 is locked in a state of facing the drive gear 126. When the control lever 60 moves backward, the brake member 70 also moves backward in the direction of the arrow j ', and as shown in FIG. And the rotation of both reels is regulated. Also, as shown in FIG.
78 is engaged with the engaged portion 82 of the FR switching lever 80, and the FR switching lever 80 is maintained at the neutral position N. As a result, as shown in FIG. 7, the FR drive gear 31 is separated from both the reversing gear 30 and the reel base gear 23.

On the other hand, the head substrate 40 has been moved back in the direction of the arrow h ′, and the pins 42 thereof are located in the notches 145 of the toothless gear 120. As shown in FIG. 7, the magnetic head 8 is completely separated from the magnetic tape 13 by the backward movement of the head substrate 40, and the F drive gear 24, the R drive gear 25, the two pinch rollers 6,
7 has also been reactivated. As shown in FIG. 8B, the selection slider 90 has also been moved back in the direction of arrow l '. In such a state, the stop mode in FIGS. 3 and 4 is set. The pause (pause) is performed in the same manner as the stop.

G ₄ Next, FIG. 3, FIG. 4, FIG. 8A to FIG.
The operation of selecting between forward and reverse will be described.

First, when a command to switch to the reproduction (recording) mode is issued, the plunger solenoid 50 is turned on. In FIG. 8B, the control lever 60 is moved forward in the direction of arrow i, and the lock portion 65 is disengaged from the first lock claw 131 of the toothless gear 120. Then, the first pin 161 of the toothless gear 120 is pressed by the torsion coil spring 165 in FIG.
120 is given an initial rotational force in the direction of arrow o, and the driving gear 1
26 is engaged. The toothless gear 120 is driven to rotate in the direction of arrow o.

After the lock is released, as shown in FIGS. 3 and 4, a first branch point A for selecting forward or reverse by turning the plunger solenoid 50 off or on is set. That is, when a forward command is issued, the plunger solenoid 50 is turned off after the lock is released by being turned on. As shown in FIG. 9A, the control lever 60 is moved back in the direction of the arrow i ', and is turned around the fulcrum pin 112 of the switching lever 110 in the direction of the arrow n by its long hole 64. The projection 146 presses the projection 93 of the selection slider 90 by the rotation of the toothless gear 120 in the direction of the arrow o, and the selection slider 90 moves forward in the direction of the arrow l. Here, when the switching slider 100 is at the forward position moved in the direction of the arrow m from the beginning as shown by the solid line, the switching lever 110 is not operated by the selection slider 90, and
100 holds the forward position. Conversely, switching slider 1
When 00 is at the reverse position moved from the beginning in the direction of arrow m 'as shown by the dashed line, the pressing portion of the selection slider 90
The pressed portion 113 of the switching lever 110 is pressed by the switch 91.
Then, the switching lever 110 is turned around the fulcrum pin 111 by an arrow n.
The switching slider 100 is pivoted in the
Is moved in the direction of arrow m to the forward position. Therefore, in any case, the switching slider 100 is moved to the forward position.

On the other hand, when the reverse is commanded, the plunger solenoid 50 is turned on following the on at the time of unlocking. As shown in FIG. 9B, the control lever 60 is moved forward in the direction of arrow i, and the switching lever 110 is moved by the long hole 64 to the fulcrum pin 1.
It is turned around arrow 12 in the direction of arrow n '. Then, as described above, when the selection slider 90 moves forward in the direction of the arrow l,
When the switching slider 100 is at the reverse position where it has been moved in the direction of arrow m 'from the beginning as shown by the dashed line, the switching lever 110 is not operated, and the switching slider 100 is held at the reverse position. Conversely, when the switching slider 100 is at the forward position moved in the direction of the arrow m from the beginning as shown by the solid line, the pressing portion 92 of the selection slider 90 causes the switching lever 110 to move.
Is pressed. Then, the switching lever 110 is rotated about the fulcrum pin 112 in the direction of arrow n ', and the fulcrum pin 112 moves the switching slider 100 in the direction of arrow m' to the reverse position. Therefore, in any case, the switching slider 100 is moved to the reverse position.

Thus, when the toothless gear 120 is rotationally driven, the first
Forward or reverse is selected by turning off or on the plunger solenoid 50 at the branch point A. During this time, the pins 42 of the head substrate 40 are
Of the first cam 141. When the selection is completed as shown in FIG. 10, the plunger solenoid
50 is turned off and the control lever 60 is moved back in the direction of arrow i '. Further, the selection slider 90 is moved from the projection 93 to the toothless gear 120.
Is moved back in the direction of arrow l 'by the separation of the projection 146. In the following drawings, the switching slider 100 has an arrow m
Is moved to the forward position in the direction and the forward is selected.

G ₅ Next, Figure 3, Figure 4, the Fig. 10, second 11B diagrams illustrating the switching operation to the reproduction (recording) mode.

First, after the selection between forward and reverse is completed in FIG. 10, the toothless gear 120 is continuously driven to rotate in the direction of arrow o, and the second cam portion 142 causes the head substrate 4 to rotate.
The 0 pin 42 is guided, and the head substrate 40 moves forward in the direction of arrow h. Then, the plunger solenoid 50 is turned on as shown in FIG. 11B. When the control lever 60 is moved forward in the direction of the arrow i and the second lock claw 132 of the toothless gear 120 is brought into contact with the lock portion 65, the toothless gear 120 is driven by the second toothless portion 122. It is locked in a state facing the gear 126. Then, the pressed portion 77 of the brake member 70 is pressed by the pressing portion 63 of the control lever 60, and the brake member 70
Is moved forward in the direction of arrow j. Thereby, both engagement claws 71, 72
Is released from both teeth portions 75 and 76 of both reel stands 2 and 3, and the regulation of the rotation of both reel stands 2 and 3 is released. In addition, 11A
As shown in the figure, the engaging portion 78 of the brake member 70 is disengaged from the engaged portion 82 of the FR switching lever 80, so that the FR switching lever 80 can swing, but is wound around the FR pulley 17. The FR switching lever 80 is pressed and urged in the direction of arrow k 'by the pressing force P due to the elasticity of the bell 20. Therefore, the pin 83 of the FR switching lever 80 comes into contact with the peripheral surface of the cam portion 150 of the toothless gear 120, and the FR switching lever 80 is held at the neutral position N.

On the other hand, as shown in FIG. 11B, the pins 42 of the head substrate 40 are guided by the second cam portions 142 of the toothless gear 120, and the head substrate 40 is completely moved in the direction of arrow h. Then, the magnetic head 8 is completely brought into contact with the magnetic tape 13 by the forward movement of the head substrate 40. Further, of the F drive gear 24 and the pinch roller 6, or the R drive gear 25 and the pinch roller 7, the latter is regulated by the other end 100b of the switching slider 100 at the forward position. Moved forward by the unit 40a. This becomes forward playback (recording) mode as described in the G ₁ Section. When the switching slider 100 is at the reverse position, the F drive gear 24 and the pinch roller 6 are regulated by the one end 100a, and only the R drive gear 25 and the pinch roller 7 are moved forward by the one end 40b of the head substrate 40. Therefore, the mode is the reverse reproduction (recording) mode.

In this manner, as shown in FIGS. 3 and 4, after the selection of the forward and reverse at the first branch point A, the forward reproduction (recording) mode and the reverse reproduction (recording) mode are selectively set. Is done.

G ₆ Next, the selection operation of the music selection mode will be described with reference to FIGS. 3, 4, and 11A to 12B.

First, the plunger solenoid 50 is turned off in the forward (reverse) reproduction (recording) mode. In FIG. 11B, the control lever 60 is moved back in the direction of arrow i ', and the lock portion 65 is disengaged from the second lock claw 132 of the toothless gear 120. Then, in FIG. 11A, the second pin 162 of the toothless gear 120 is pressed by the torsion coil spring 165, the initial rotational force in the direction of arrow o is applied to the toothless gear 120, and the toothless gear 120 is engaged with the drive gear 126. . And missing gear 1
20 is driven to rotate in the direction of arrow o.

After the lock release, as shown in FIGS. 3 and 4, a fourth branch point D for selecting the non-tune selection mode or the music selection mode by turning off or on the plunger solenoid 50 is set. Note that this function is unique to the present embodiment, and is set before a second branch point B and a third branch point C, which will be described later, but is described here as a fourth branch point D. That is, when the non-tune selection mode is instructed, the plunger solenoid 50 is subsequently turned off after the lock is released by turning off. As shown in FIG. 12A, the control lever 60 is moved back in the direction of the arrow i ', and its protrusion 66
Is separated from the rear side of the projecting piece 44 of the head substrate 40. Then, the toothless gear 120 is driven to rotate in the direction of arrow o, and the pins 42 of the head substrate 40 are moved onto the third cam portions 143 of the toothless gear 120. The pins 42 of the head substrate 40 are connected to the third cam portions 14.
When the notch 144 of FIG. 3 is reached, the protruding piece 44 of the head substrate 40 is not restricted by the protruding portion 66 of the control lever 60. The head substrate 40 is moved back in the direction of arrow h '. As a result, the magnetic head 8 is completely separated from the magnetic tape 13. Further, the F drive gear 24 and the pinch roller 6 or the R drive gear 25 and the pinch roller 7 that have been moved forward are also moved back as the head substrate 40 moves back.

On the other hand, when the music selection mode is instructed, the plunger solenoid 50 is turned on after the lock is released by being turned off.
As shown in FIG. 12B, the control lever 60 is moved forward in the direction of arrow i, and the projection 66 is inserted into the head substrate 40 at the rear side of the projection 44. Therefore, when the pin 42 of the head substrate 40 reaches the notch 144 of the third cam portion 143, the projection 44 of the head substrate 40 is regulated by the projection 66 of the control lever 60. 42 is moved onto the third cam portion 143 without falling into the notch portion 144 as shown by the arrow q. As a result, the head substrate 40 is held in a state of being slightly moved back in the direction of the arrow h ', and the magnetic head 8 comes into a state of lightly contacting the magnetic tape 13.

Thus, when the toothless gear 120 is rotationally driven, the fourth
By turning off or on the plunger solenoid 50 at the branch point D, the separated state and the contact state of the magnetic head 8 with respect to the magnetic tape 13 are selected. After this, the plunger solenoid 50 is turned off.

G ₇ Next, Figure 3, Figure 4, the Fig. 13, second 14C diagram illustrating the switching operation to the fast forward mode.

First, after the selection of the non-tune selection mode and the music selection mode described above, as shown in FIG.
And the pin 83 of the FR switching lever 80 is turned in the direction of the arrow r.
Are moved between the cam portion 150 and the guide portion 152 of the toothless gear 120 as shown by. Here, as shown in FIG. 3 and FIG. 4, a second branch point B for selecting the switching state to the fast-forward mode and the non-switching state by turning on or off the plunger solenoid 50 is set. That is, when the fast-forward mode is commanded, the plunger solenoid 50
Is turned on. As shown in FIG. 14A, the control lever 60 moves forward in the direction of arrow i, and the pressed portion 63 of the brake member 70 is pressed by the pressing portion 63 to move forward in the direction of arrow j. Since the engaging portion 78 of the brake member 70 is disengaged from the engaged portion 82 of the FR switching lever 80, the FR switching lever 80 is in a swingable state. Pin 83 of F switching lever 80 is missing tooth gear 12
A spring 153 for selecting a passage between the guide portion 152 and the cam portion 150 of the guide portion 152.
After the movement, the pin 83 of the FR switching lever 80 is swingable, and the pin 83 of the FR switching lever 80 is selectively guided to the first passage (arrow s) by the spring 153, so that the protrusion 83 Department
Move outside 151. As a result, the FR switching lever 80 swings in the direction of arrow k, and the FR drive gear 31 is engaged with the reverse gear 30. Since the plunger solenoid 50 is turned on to move the control lever 60 forward in the direction of arrow i as shown in FIG. 14B, the third lock claw 133 of the toothless gear 120 comes into contact with the lock portion 65 thereof. By missing gear 1
20 is locked with the third toothless portion 123 facing the drive gear 126. This will fast forward mode as described in the G ₁ Section.

On the other hand, if the fast-forward mode has not been commanded, the plunger solenoid 50 is turned off. In FIG. 14C, the brake member 70 is also moved back in the direction of arrow j 'by the movement of the control lever 60 in the direction of arrow i'.
78 is engaged with the engaged portion 82 of the FR switching lever 80, and the FR switching lever 80 is held in a fixed state at the neutral position N. Therefore, the pin 83 of the FR switching lever 80 is selectively guided to the second passage (arrow t) against the spring 153 for selecting a passage, and moves between the cam portion 150 and the protrusion 151. As a result, the FR drive gear 31 is not engaged with either the reversing gear 30 or the reel base gear 23, and since the plunger solenoid 50 is off, the toothless gear 120 is not locked and the fast-forward mode is passed (passed).

Thus, as shown in FIG. 3 and FIG.
At the branch point B, the switching state to the fast-forward mode and the non-switching state are selected, and the fast-forward mode and the passage thereof are selectively set. As shown in FIG. 3, when the fast-forward mode is set, selection of forward and reverse at the first branch point A and selection of the non-tune selection mode and the music selection mode at the fourth branch point D are performed. Thus, the respective modes of fast-forward in forward, fast-forward selection in forward, fast-forward in reverse, and fast-forward in reverse are respectively set.

By the way, when switching between the fast-forward mode and its passage,
A spring for selecting a passage provided on the cam portion 150 of the toothless gear 120
Since the FR switching lever 80 is selectively guided to the first passage and the second passage by the 153, there is no need to provide a special biasing spring for the FR switching lever 80, and the spring 15
3, the FR switching lever 80 is reliably driven only at the time of switching.

G ₈ Next, Figure 3, Figure 4, by the FIG. 14A, second 15C diagram illustrating the switching operation to the rewind mode.

First, the plunger solenoid 50 is turned off in the fast-forward mode. It is off as it is after passing through the fast-forward mode. In FIG. 14B, the control lever 60 is moved back in the direction of arrow i ', and the lock portion 65 is disengaged from the third lock claw 133 of the toothless gear 120. Then, in FIG. 14A, the third pin 163 of the toothless gear 120 is pressed by the torsion coil spring 165, the initial rotational force in the direction of arrow o is applied to the toothless gear 120, and the toothless gear 120 is engaged with the drive gear 126. . The toothless gear 120 is driven to rotate in the direction of arrow o.

After the lock is released, as shown in FIGS. 3 and 4, a third branch point C for selecting the switching state to the rewind mode or the non-switching state by turning on or off the plunger solenoid 50 is set. Have been. That is, when the rewind mode is commanded, the plunger solenoid 50 is turned on. As shown in FIG. 15A, the brake member 70 is reciprocated in the direction of the arrow j via the control lever 60.
FR switching lever 80 is swingably state like the G ₇ Section. FR
Since the switching lever 80 is pressed and urged in the direction of arrow k 'by the pressing force P due to the elasticity of the belt 20 wound around the FR pulley 17, the pin 83 of the FR switching lever 80 is rotated with the rotation of the toothless gear 120. As shown by the arrow u, the concave portion 154 of the cam portion 150
It is inserted into. As a result, the FR switching lever 80 swings in the direction of arrow k ', and the FR drive gear 31 is engaged with the reel base gear 23. When the plunger solenoid 50 is turned on, the control lever 60 moves forward in the direction of arrow i as shown in FIG. 15B, so that the fourth lock claw 134 of the toothless gear 120 comes into contact with the lock portion 65. As a result, the toothless gear 120 is locked with the fourth toothless portion 124 facing the drive gear 126. This will rewind mode as described in the G ₁ Section.

On the other hand, when the rewind mode is not commanded, the plunger solenoid 50 is turned off. Since 'the brake member 70 also arrow j by backward in the direction' is backward in the direction of arrow i of the control lever 60 in the first 15C diagram, the G _7, wherein similarly to FR switching lever 80 is fixed in the neutral position N Held in state. Therefore, the pin 83 of the FR switching lever 80 moves without being inserted into the concave portion 154 of the cam portion 150 as shown by the arrow v. As a result, the FR drive gear 31 is not engaged with either the reversing gear 30 or the reel base gear 23, and since the plunger solenoid 50 is off, the toothless gear 120 is not locked and the rewind mode is passed.

In this way, as shown in FIGS. 3 and 4, at the third branch point C, the switching state to the rewinding mode and the non-switching state are selected, and the rewinding mode and the passage therethrough are selectively performed. Is set to As shown in FIG. 3, when the rewind mode is set, the selection between forward and reverse at the first branch point A and the non-tune selection mode and the music selection mode at the fourth branch point D are performed. Depending on the selection, the respective modes of rewind in forward, rewind selection in forward, rewind in reverse, and rewind in reverse are set respectively.

By the way, when switching between the fast-forward mode and the rewind mode, the FR switching lever 80 and the brake member 70 are engaged with each other.
The two parts 82 and 78 are mutually restricted. That is, in FIG. 14A or 15A, the brake member 70 moves forward in the direction of arrow j to release the regulation of the rotation of the two reel stands 2 and 3, and the engaging portion 78 is disengaged from the engaged portion 82. Thereby, the FR switching lever 80 is swung for the first time. Therefore, when the FR drive gear 31 of the FR switching lever 80 is engaged with the reversing gear 30 or the reel base gear 23, no gear switching noise occurs. In the state where the FR switching lever 80 is rocked, the backward movement of the brake member 70 is restricted by the engaged portion 82 of the FR switching lever 80, and thus the rotation of both reel bases 2 and 3 is performed by the brake member 70. It is not regulated. On the other hand, when the FR switching lever 80 is returned to the neutral position N and the engaging portion 78 of the brake member 70 is engaged with the engaged portion 82, the brake member 70 is moved back for the first time. Therefore,
Even when the FR drive gear 31 of the FR switching lever 80 is disengaged from the reversing gear 30 or the reel base gear 23, no gear switching noise occurs.

In addition, the FR switching lever is
When driving the FR switching lever 80, the FR switching lever 80 is pressed and urged by the pressing force P due to the elasticity of the belt 20 wound around the FR pulley 17 of the FR switching lever 80, and the pin 83 of the FR switching lever 80 is It is in elastic contact. Therefore, the belt 20
Transmitting the rotation of the motor 18 to the FR drive gear 31,
Both functions of pressing and urging the switching lever 80 are exhibited, and it is not necessary to provide the FR switching lever 80 with a special and exclusive urging spring.

Incidentally, when the plunger solenoid is turned off in the rewind mode, the control lever 60 in FIG.
And the lock portion 65 is moved to the fourth position of the toothless gear 120.
Is released from the lock claw 134. Then, in FIG. 15A, the fourth pin 16 of the toothless gear 120 is
4 is pressed, the toothless gear 120 is given an initial rotational force in the direction of arrow o, and is engaged with the drive gear 126. The segment gear 120 is arrow o go is rotated in the direction, again stopped mode as described in the G ₃ Section is set by off of the plunger solenoid 50.

The embodiment of the present invention has been described above, but the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the switching lever and the driving rotator are used.
Although the FR switching lever and the FR drive gear are shown and switching between fast forward and rewind has been described, switching between forward reproduction (recording) and reverse reproduction (recording) may be performed. The driving rotating body is not limited to the driving gear, but may be an idler or the like.

The present invention is not limited to the rotary drive of a reel base in a Rebus-type table recorder using a compact cassette, but can be applied to the rotary drive of a reel base in various recording / reproducing apparatuses.

H Advantageous Effects of the Invention The present invention provides a mode switching cam which presses and biases a latch lever by elasticity of a belt stretched between a pulley of a driving rotating body supported by a switching lever and a pulley of a motor. Since the belt can be elastically contacted with the portion, the belt exerts both the function of transmitting the rotation of the motor to the driving rotating body and the function of pressing and biasing the switching lever. Therefore, there is no need to provide a special and exclusive biasing spring for the switching lever. Therefore, the number of parts and the number of assembling steps can be significantly reduced, and the structure can be made very simple.

Further, the blocking mechanism of the present invention can simultaneously release and prevent the rotation of the pair of reel bases and the swinging of the switching lever. There is no inconvenience that drives the platform and, as a result, damages the reel platform and the switching lever. Further, the device can be simplified.

[Brief description of the drawings]

1 shows an embodiment in which the present invention is applied to a reverse type tape recorder using a compact cassette. FIG. 1 is an exploded perspective view of a tape traveling drive system, FIG. 2 is a plan view of the same, FIG. The figure shows the mode switching flowchart.
FIG. 4 is a timing chart of mode switching by turning on and off the plunger solenoid, FIG. 5 is an exploded perspective view of the mode switching mechanism viewed from the bottom side, FIG. 6 is a perspective view showing the upper surface of the toothless gear, FIG. FIG. 8A is a plan view of a main part in the stop mode, FIG. 8A is a bottom view of the same, FIG. 8B is a partially broken bottom view of the same, FIG. FIG. 10 is a partially cutaway bottom view showing the reverse selection, FIG. 10 is a partially cutaway bottom view showing the completion of the forward or reverse selection, and FIG. 11A is a bottom view of the main part in the reproduction (recording) mode. 11B is a partially broken bottom view of the same as above, FIG. 12A is a partially broken bottom view of a main part showing selection of a non-tune selection mode, FIG. 12B is a partially broken bottom view of the same showing selection of a music selection mode, FIG. Bottom view of main part showing selection of fast forward mode, FIG. Ri bottom view of an essential part in the mode, the 14B diagram partially cutaway bottom view of the same, the 14C
FIG. 15A is a bottom view of the main part in the rewind mode, FIG. 15B is a partially broken bottom view of the same in the rewind mode, and FIG. 15C is a bottom view of the same in the rewind mode. FIG. In the reference numerals used in the drawings, 2 ... reel base 3 ... reel base 17 ... FR pulley (pulley) 18 ... motor 19 ... drive pulley 20 ... belt 22 ... reel base gear 23 ... reel base Gear 30 Reversing gear 31 FR drive gear (drive rotating body) 70 Brake member (blocking mechanism) 80 FR switch lever (switch lever) 120 Missing gear 126 Drive gear 150 Cam part P: Pressing force

Claims (1)

(57) [Claims] A swingable switching lever, a drive rotator supported by the switching lever and selectively engaged with one of a pair of reel stands to drive the reel stand; A pulley rotatably provided on the lever, an elastic belt wound between the pulley and the driving pulley of the motor, and a cam portion for swinging the switching lever in accordance with the mode switching. A toothless gear, a gear that engages with the toothless gear that has been rotated by the initial rotational force, and drives the toothless gear in accordance with the mode switching; a pair of the rotatable reel base and the swinging gear; A blocking mechanism that engages with each of the movable switching levers to prevent the rotation and the swing at the same time, and releases the switching lever from the blocking mechanism in accordance with the switching of the mode so as to be swingable. , The above drive times A reel base drive device configured to drive the rolling element by the motor and via the belt, and to press the switching lever against the cam portion of the toothless gear by the elasticity of the belt.