JPS624918Y2 - - Google Patents

Description

[Detailed description of the invention] This invention detects the end of tape feeding and reliably automatically stops the drive mechanism during fast forwarding and rewinding of a tape recorder that uses a tape whose tape end is fixed to a reel. This relates to an automatic stop device for tape recorders.

Conventionally, this type of device generates pulses using a rotary switch or the like linked to the reel rest, processes these pulses using an electronic circuit, detects the stopped state of the reel rest due to the end of the tape, and stops the drive mechanism using a solenoid or the like. It was hot. Further, the drive mechanism was provided with a slip mechanism between the drive source and the reel rest in order to prevent the tape, pulley, motor, etc. from becoming overloaded at the end of the tape.

In the automatic stop device for a tape recorder constructed as described above, the rotary switch and the electronic circuit are expensive and inconvenient, and the slip mechanism may cause failure due to deterioration over time. The drive system continues to rotate in a slip state due to the slip mechanism until the signal is processed in the electronic circuit and the drive mechanism is stopped, which is not suitable for power saving. There were flaws.

The present invention was made to eliminate the drawbacks of the conventional ones as described above, and by using a revolving arm drive type double planetary gear device in the drive system, there is no need for the above-mentioned rotary switch or complicated electronic circuit. Another object of the present invention is to provide an automatic stop device for a tape recorder that does not require a slip mechanism in the drive system and allows easy adjustment of the drive force for tape running.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a front view of the main part of the present invention, Fig. 2 is a front view of the main part of the invention;
The figure is also a side sectional view, and in the figure, 1 is a substrate, 2 is a rotating shaft fixed to the substrate 1, 3 is a rotating shaft that rotates around this rotating shaft 2, and has reel rests 12 and 13, which will be described later, at one end. A first sun gear to which the output gear 3a to be driven is fitted; 4 is a second sun gear located between the first sun gear 3 and the output gear 3a, and coaxially pivoted to the first sun gear; , 5, one is the first
A sun gear 3 and a planetary gear 6 in the form of a compound spur gear that meshes with the second sun gear 4 , the other gear 6 are coaxial with the first sun gear 3 with the planetary gear 5 as the center. 7 is a motor, 7a is a motor pulley fixed to the rotating shaft of the motor, 8 is a belt wound around the belt wheel 6 and the motor pulley 7a, and the first sun gear 3 and the second sun The gear 4, the planetary gear 5, and the belt wheel 6 corresponding to the revolving arm constitute a revolving arm drive type double planetary gear device. Reference numeral 9 denotes a lever that is rotatable around the rotating shaft 2; 10 is an intermediate gear that rotates around a shaft 9a fixed to the lever 9 and meshes with the output gear 3a; and 11 is pivotally connected to the substrate 1. 12 is a reel rest on the take-up side having a gear 12a which is pivotally mounted on the base plate 1 and meshes with the idler gear 11; 13 is a supply gear which is also pivotally attached to the base plate 1 and has a driven gear 13a; On the reel rest on the side, the intermediate gear 10 and the rotating shaft 2, which is the center of rotation of the lever 9 that supports it, the idle gear 11, and the reel rest 13 on the supply side are connected to each other when the lever 9 is rotated counterclockwise in the tape fast-forwarding state. Move the intermediate gear 10
and the idle gear 11 mesh with each other to drive the reel rest 12 on the winding side, and in the tape rewinding state, the lever 9 rotates clockwise to engage the intermediate gear 10 and the reel rest 13 on the supply side. Gear 13a
are engaged with each other to drive the reel rest 13 on the supply side, and furthermore, the intermediate gear 10 is arranged so as to be separated from the idle gear 11 and the gear 13a of the reel rest 13 on the supply side in the stopped state. 14 is a rotating shaft 1 fixed to the substrate 1
5 is a rotation center, and has an operating portion 14a formed at one end for pressing a switch 18, which will be described later.This operating lever has a rotating shaft 15.
A gear 14b that meshes with the first sun gear 3 is formed around , and is biased counterclockwise by a tension spring 16 fixed to the base plate 1 at one end. Therefore, rotation in the counterclockwise direction is restricted.

3 is a plan view illustrating the operation of the revolving arm drive type compound planetary gear device, and FIG. 4 is a side sectional view, in which 5a is the first sun gear 3 of the planetary gear 5.
5b is a gear that also meshes with the second sun gear 4; 6a is a gear that meshes with the second sun gear 4;
This is a balancer embedded in the belt pulley 6 in a symmetrical position.

5 to 9 are diagrams for explaining the overall structure and operation of the present invention. Reference numeral 18 is attached to the base plate 1, and when the operating lever 14 is rotated clockwise, the operating lever 14 is rotated. The switch 19 of the solenoid 33, which is pressed by the action part 14a to be in the closed state, is rotatably attached to the base plate 1, and one end thereof becomes an engaging part 19a with a shaft 9a fixed to the lever 9. a lever 2 that interlocks with the lever 9;
0 has one end fixed to the board 1 and the other end attached to the lever 1.
9 and the engaging portion 19a of this lever 19.
a tension spring 19 that is biased so as to hang on one end of the lever 19 facing the engaging portion 19a and maintain the lever 19 in a neutral position;
b and 19c are pressing parts provided on the lever 19, and the lever 19 rotates clockwise when the pressing part 19b is pressed, and counterclockwise when the pressing part 19c is pressed. It's getting old. 21 is a guide shaft 2 implanted in the substrate 1
2, the fast-forward actuator 21 has a fast-forward button 21a, a pin 21b that comes into contact with the pressing part 19b of the lever 19, and a lock pin 21c. It is energized by a tension spring 23. Reference numeral 24 denotes a rewind operator which is slidable via a guide shaft 25 implanted in the base plate 1, and includes a rewind button 24a and a lever 19.
This unwinding actuator 24 has a pin 24b and a lock pin 24c that come into contact with the pressing part 19c of the substrate 1.
It is energized by a tension spring 26 which has one end fixed to. Reference numeral 27 denotes a locking plate that can be moved laterally via a guide shaft 28 embedded in the base plate 1.
engages with the lock pin 21c of the fast-forwarding actuator during tape fast-forwarding and with the locking pin 24c of the rewinding actuator during tape rewinding, and causes these fast-forwarding actuator 21 and rewinding actuator 24 to be in the tape fast-forwarding state and the rewinding state, respectively. Hook portion 27 that locks the
a, 27b, oblique side 27c, and a spring pin 33b embedded in a plunger 33a to be described later.
It has an engaging portion 27d with which it is energized by a tension spring 29. 30 is a guide shaft 31 implanted in the substrate 1
Stop button 3 is a stop actuator that can be slid freely through the
0a and a contact portion 30b that abuts against the oblique side 27c of the locking plate 27 to move the locking plate to the right in the figure when the stop actuator is actuated. is energized by. 3
3 is a solenoid attached to the board 1, 33a
is a plunger that is attracted when current flows through this solenoid 33, and the locking plate 27 is attached to one end of the plunger.
Spring pin 33b that engages with the engaging portion 27d of
is buried.

FIG. 7 is a diagram showing the tape fast forwarding state, 34 is a cassette tape, FIG. 9 is a wiring diagram showing the solenoid 33 and switch 18, and 35 is a wiring diagram showing the solenoid 33.
It is the power source.

Next, the operation will be explained. As described above, the first sun gear 3, the second sun gear 4, the planetary gears 5, and the belt wheel 6 corresponding to the revolution arm constitute a revolution arm drive type compound planetary gear device. The number of teeth of gear 3 is T ₁ , and the number of teeth of second sun gear 4 is T 1 .
T ₂ , the number of teeth of the gear 5a meshing with the first sun gear 3 of the planetary gear 5 is V ₁ , the number of teeth of the gear 5b meshing with the second sun gear 4 is V ₂ , the rotation speed of the belt wheel is n ₀ , The rotation speed of the first sun gear relative to space is
n ₁ , the rotation speed for the belt wheel is n′ ₁ , the second
The number of rotations of the sun gear with respect to space is n ₂ , the number of rotations with respect to the belt wheel is n′ ₂ , the number of rotations of the planetary gear with respect to space is n ₃ , the number of rotations with respect to the belt wheel is n′ ₃ , and the rotation of each gear Assuming that the counterclockwise direction is positive, the relationship between the number of rotations of each gear relative to the space and the number of revolutions relative to the belt wheel is as follows.

n′ ₁ =n ₁ −n ₀ ……(1) n′ ₂ =n ₂ −n ₀ ……(2) n′ ₃ =n ₃ −n ₀ ……(3) Between the first sun gear and the planet gear Since the gear 5a is always meshed, n' ₃ = T ₁ /V ₁ = n' ₁ (4), and similarly, the gear 5 of the second sun gear and the planetary gear
Since b is also always meshed, n' ₃ =T ₂ /V ₂ n' ₂ ...(5). Now, by eliminating n′ ₃ from equations (4) and (5), we get the equation
Substituting (1) and equation (2), T ₁ /V ₁ (n ₁ - _{n 0} ) = T ₂ /V ₂ (n ₂ - n ₀ ) When transformed, T ₂ /V ₂ n ₂ - _{T 1} / V ₁ n ₁ = (T ₂ /V ₂ −T ₁
/V ₁ )n ₀ ΔT ₂ V ₁ n ₂ −T ₁ V ₂ n ₁ =(T ₂ V ₁ −T ₁ V ₂ )n ₀ (6).

When both the first sun gear and the second sun gear are free to rotate without any load, n ₁ =n ₂ =n ₀ , and the entire planetary gear system rotates as if it were one piece. Next, when a load is applied to the second sun gear by some means to make n ₂ = 0, from equation (6), n ₁ = -T ₂ V ₁ - T ₁ V ₂ /T ₁ V ₂ n ₀ ...( 7) Here, if T ₂ > T ₁ V ₁ > V ₂ , the first sun gear rotates in the clockwise direction opposite to the belt wheel at the rotation speed shown in equation (7). Similarly, when a load is applied to the first sun gear and n ₁ = 0, from equation (6), n ₂ = T ₂ V ₁ - T ₁ V ₂ /T ₂ V ₁ n ₀ ...(8) , the second sun gear rotates in the same counterclockwise direction as the belt wheel at the rotation speed shown by equation (8).

Further, when a load is applied to both the first sun gear and the second sun gear, one rotates and the other stops depending on the magnitude of the load applied to each. In other words, assuming that there is no transmission loss between each gear and no rotational axis loss of each gear, the load applied to the first sun gear is T ₁ V as a ratio of rotational force to the load applied to the second sun gear. When ₂ /T ₂ V is less than ₁ times,
The second sun gear is in a stopped state, only the first sun gear rotates, and then the load applied to the first sun gear is expressed as a rotational force ratio of T ₁ V ₂ /T ₂ V to the load applied to the second sun gear. When it becomes larger than ₁ times, the first
The sun gear stops and the second sun gear starts rotating.

When a revolving arm drive type double planetary gear device having the characteristics described above is arranged as shown in FIG. is energized counterclockwise by the tension spring 16, the first sun gear 3 rotates with a rotational force corresponding to the rotational force of the operating lever 14 by the tension spring 16, and the output fitted thereto rotates. The reel rest is driven by the gear 3a.

Next, the operation will be explained according to FIGS. 5 to 9.
FIG. 5 shows the stopped state. Although not shown here, a motor switch is provided that operates in conjunction with the fast-forward actuator 21 and the rewind actuator 24, and it is assumed that the motor 7 is stopped in this stopped state. . 6th
The figure and FIG. 7 show the tape fast forwarding state. In the figure, when the fast-forward button 21a is pressed in the direction of the arrow shown, the lock pin 21c of the fast-forward actuator 21 enters the hook portion 27a of the locking plate 27, locking the fast-forward actuator 21 in the tape fast-forwarding state.
At this time, the motor switch (not shown) is closed, so the motor 7 rotates counterclockwise, and the output gear 3a fitted to the first sun gear 3
The intermediate gear 10 meshed with rotates counterclockwise. Further, since the pin 21b protruding from the fast-forwarding actuator 21 presses the pressing portion 19b of the lever 19, the lever 19 rotates clockwise.
The intermediate gear 10 and the idle gear 11 mesh with each other, and the reel rest 12 on the winding side rotates counterclockwise so that the tape can be wound in a fast forward state. Note that the maximum winding force at this time is determined by the tension spring 16.

To change from the tape fast-forwarding state to the stop state shown in FIG.
The contact portion 30b contacts the oblique side 27c of the locking plate 27 and moves the locking plate 27 to the right, so that the hook portion 27a
Then, the fast-forward actuator 21 is disengaged from the lock pin 21c, and the fast-forward actuator 21 is moved downward by the tension spring 23 to the stopped state shown in FIG.
Next, the manner in which the tape automatically stops at the end of the tape will be explained with reference to FIG. 8. The tape end of the cassette tape 34 shown in FIG.
is locked by the tape, the load conditions of the first sun gear 3 and the second sun gear 4 are reversed, and the second sun gear 4 begins to rotate. Therefore, the operating lever 14 rotates clockwise, and the operating portion 14a of the operating lever 14 presses the switch 18 to reach the closed state, and current is applied to the solenoid 33 by an electric circuit as shown in FIG. Flow plunger 33a is sucked into solenoid 33. As a result, the locking plate 27 engaged by the spring pin 33b moves to the right, resulting in the stopped state shown in FIG. 5 as in the case of the manual operation described above.

On the other hand, to bring the tape into the rewind state, by pressing the rewind button 24a, the pin 24b protruding from the rewind actuator 24 is moved to the pressing part 19 of the lever 19.
c is pressed, the lever 19 rotates counterclockwise, and the intermediate gear 10 and the reel rest 13 on the supply side rotate.
The reel rest 1 meshes with the gear 13a of the reel rest 1.
3 rotates clockwise to enter the tape rewinding state.
The process leading up to the tape rewind state and the progress up to the stop state are the same as those in the tape fast forward state.

In the above embodiment, the revolution arm of the revolution arm drive type compound planetary gear is the belt pulley 6, and the rotation is directly transmitted from the motor 7 by the belt 8, but the drive source may be a flywheel, and the revolution arm may be a gear or a friction wheel, not limited to the belt drive. Also, the means for applying a load to the second sun gear 4 and the mechanism for applying the rotational force of the second sun gear 4 starting to rotate at the tape end to the switch 18 are embodied as a single component, the gear 14b and the action part 14a for pressing the switch 18, and the action lever 14 is biased by the tension spring 16, but the gear that meshes with the second sun gear 4 and the action element for pressing the switch 18 may be separate components, and a cam or the like may be provided on the former and engaged with the latter, and either the former or the latter may be biased by a desired elastic body so as to become the load on the second sun gear.

As described above, according to the present invention, a revolving arm drive type double planetary gear device is used in the drive system, one of the rotational forces obtained from each of the two sun gears is used to run the tape, and the other is a solenoid that releases the drive mechanism. The configuration allows the rotational force from the drive source to be automatically converted from the tape running drive to the drive that acts on the switch by balancing the load applied to each switch to act on the switch. The device can be made at a lower cost than those using detection electronic circuits. In addition, when the first sun gear stops at the end of the tape, the second sun gear continues to rotate, so the rotation of the rotating body becomes the rotation of the second sun gear, and there is no need for a slip mechanism, resulting in high reliability and power savings. Suitable. Furthermore, since the driving force for running the tape is determined by the magnitude of the load applied to the second sun gear, the driving force can be adjusted very easily, which is very effective.

[Brief explanation of drawings]

Figures 1 to 9 show an embodiment of the device of the present invention. Figure 1 is a front view of the main parts of the invention, Figure 2
The figure is also a side sectional view, and Fig. 3 is a plan view illustrating the operation of the revolving arm drive type double planetary gear device.
Fig. 4 is a side sectional view, Fig. 5 is a plan view of the tape recorder in a stopped state, Figs. 6 and 7 are plan views of the tape recorder in a fast forward state, and Fig. 8 is a plan view of the tape recorder in a stopped state automatically at the end of the tape. FIG. 9 is a plan view showing the situation, and FIG. 9 is a wiring diagram. 1... Board, 3... First sun gear, 4... Second
Sun gear, 5... Planet gear, 6... Belt wheel, 1
0... Intermediate gear, 14... Action lever, 14b...
...Gear, 16...Tension spring, 18...Switch,
27...Lock plate, 33...Solenoid. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of utility model registration request] a first sun gear, a second sun gear disposed coaxially with the sun gear, a planetary gear meshing with both of the gears, and a second sun gear with the planetary gear pivotally connected to the first and second sun gears; Driven by a revolving arm drive type double planetary gear device that is rotatable coaxially with a gear and includes a rotating body serving as a drive source, and the first sun gear or a gear fixed to the first sun gear. an intermediate gear, an engagement means for engaging the intermediate gear with the tape drive section, a holding mechanism for maintaining the tape running state of the engagement means, and the second sun gear or a gear fixed to the second sun gear. means for engaging and applying a load to the second sun gear corresponding to the rotational force necessary for running the tape; and an actuation lever or actuator that interlocks with the second sun gear, which begins to rotate at the end of the tape, against said load; A tape characterized by comprising a switch that is pressed by the rotating operating lever or operator, and a release device that operates when a current flows to release the holding mechanism when the switch is in a closed state. Automatic stop device for recorder.