JPS5914325A - Motor protecting device for automatic loading mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cassette tape player, and more particularly to a so-called autoloading type tape player that automatically loads and unloads a cassette.

[Technical Background of the Invention] In a cassette tape player, in order to automatically load and unload a cassette, it is most common to use the driving force of a motor as a drive source for loading and unloading the cassette. .

That is, when installing, when the cartridge is manually loaded into the pack guide provided on the tape player, a switch attached to the pack guide detects this and transfers the driving force of the motor to the pack guide via gears or other transmission means. Then, the pack guide is automatically drawn into the tape breaker X7, and the cassette is set at a predetermined playing position.

On the other hand, when attaching and detaching, when an eject signal for detaching is given to the tape player, the tape drive motor and the pack guide are reconnected, and the force of this motor moves the pack kite in the opposite direction from when it was attached, and the tape player The cassette (-) is also sent out.

[Problems with the background art] In such a tape player, if foreign matter such as solder chips gets into the autoloading mechanism and the autoloading mechanism stops midway through operation, the connection between the motor and the pack guide section is not severed. This has the disadvantage that a large load is applied to the motor, and if left as it is, the motor may burn out. In particular, normal autoloading type tape players,
The power is turned on and the motor rotates when the cassette is inserted into the pack guide, and there is almost no need to set up a separate power switch. If the motor is stopped midway, there is no means to stop the motor, and therefore, burnout of the motor is unavoidable, and failures in the loading mechanisms 71-1 to 71-1 have the disadvantage of spreading to the motor.

1. Purpose of the Invention The present invention was proposed in order to solve the drawbacks of the conventional A-loading type arp player as described in 1-1. An object of the present invention is to provide a motor protection device for an autoloading mechanism that can prevent motor burnout in the event of a failure, and can detect a failure at an early stage.

[Summary of the Invention] The motor protection device of the present invention includes a switch that opens and closes when the installation of the current is completed, a switch that opens and closes when the installation and removal of the cassette l- is completed, and a timer that interlocks with these switches. If the driving time of the auto-setting associated with opening and closing exceeds the time set in advance on the timer, the power to the motor is automatically cut off.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be specifically described with reference to the mechanism diagrams shown in FIGS. 1 and 2, and the circuit diagram shown in FIG. 3.

A. Configuration (autoloading mechanism part) J5 in Figures 1 and 2, 1 is a pack guide disposed on the board of the Arp player so that it can be lowered freely in 4 ways. Guide arm 2 installed in
supported by the tip of the This guide arm 2
is the part of the support@3 installed at both ends of the back part, which is rotatably attached to the side plate 4 of the tape play A7, and the front end of the support @3 is attached to the side plate 4 of the tape play A7. The tip of the kite arm 2 is movably connected to the upper surface of the pack guide 1, and as the guide arm 2 moves up and down, the pack guide 1 goes up and down the 34 & soil of the tape play rod 7.

That is, a slide plate 5 having a U-shaped cross section that surrounds the side plate 4 from the outside is supported on the side plate 4 of the tape player so as to be slidable in the front direction. 6, a guide bin 7 protruding from the side of the guide arm 2
is inserted.

The four lowering cams 6 are equipped with two developer cams, one for the -F arm and one for lowering, and as the slide plate 5 moves back and forth, the guide pin 7 is pressed by the tapered cam, so that the guide arm 2 moves up and down around the support shaft 3.

A guide hole 8 extending back and forth is formed at the center of the upper surface of the guide arm 2, and a plastic pack stopper 9 is slidably fitted into the guide hole 8. The front end of the back stopper 9 extends to the center of the upper surface of the pack guide 1, and a claw 9a that engages with the reel shaft insertion hole of the cassette is provided on the lower surface of the back stopper 9. Further, at the back end of the back stopper 9, there is provided a stopper piece 9b, which projects downward, and which comes into contact with the tip of the cassette inserted into the pack guide 1.

On the other hand, a horizontal portion is formed on the upper edge of the side plate 4 of the arp player so as to support the upper horizontal portion of the sleight root 5, and a swing lever 10 having a substantially 1-shape is formed on this horizontal portion.
A part of the center corf is pivoted. The tip of one arm of the swing lever 10 is branched into a U-shape, and this portion is slidably engaged with a pin 11 provided on the upper surface of the back stopper 9. In addition, a kite roller 12 is provided at the tip of the arm used to use the swing lever 10 and protrudes upward.
It is inserted into the frame 13. Like the elevating cam 6, this loading/unloading cam 13 is also formed of two tapered cams on the loading side and the loading/unloading side, and as the slide plate 5 moves back and forth, these tapered cams press the guide roller 12. and rotate the swing lever 10 around a part of the corner,
A back stopper 9 engaged with the tip of a swing lever 10 is moved back and forth along a guide hole 8 of a guide arm 2.

By the way, a rack 14 is formed on the side edge of the lower horizontal portion of the slide plate 5, and an autoloading drive gear 15 rotated by a motor meshes with this rack 14.

At the front and rear ends of this slide plate 5, there are operating pieces 16.
17 is provided protrudingly, and this actuating piece 16. Opposed to '17,
The side plate 4 is provided with a mounting completion switch SW1 and a removal completion switch SW2. That is, the installation completion switch SW1 is placed in the position where it opens and closes when the slide plate 5 reaches the inner part of the Dave Brase and the installation of the cassette is completed.
On the other hand, the attachment/detachment completion switch SW2 is set at a position where the slide plate 5 is opened/closed when the slide plate 5 moves toward the front side and the attachment/detachment to/from the cassette is completed.

(Motor protection circuit) Said O1-Loading mechanism section mounting completion switch S
In this embodiment, W1 and detachment completion switch SW2 are as follows:
It is connected to the motor with a circuit configuration as shown in FIG.

These switches SW1.8W2 are connected in parallel to the power supply. These switches SW1. Resistors R1 and R2 are connected in series with SW2, respectively, and the resistors R1 and R2 and switches SWI and SW2 are connected to the base of an NPN transistor Q1 connected in parallel with the switches SW1 and SW2. has been done. The collector of this transistor Q1 is connected to the base of a PNP type 1-transistor Q2, which is also connected in parallel with the transistor Q1.

A capacitor C is connected in series to the collector of the transistor Q2 via a resistor R5, and a resistor R3 is inserted in parallel with the transistor Q2 and the resistor R5 on the power supply side of the capacitor C, and a resistor R4 is connected to the collector of the transistor Q2. The input terminal of the Schmitt circuit S is connected thereto. and,
The output terminal of this Schmitt circuit S is connected to the base of an NPN transistor Q3, and this 1-transistor Q3
is connected to the base of an NPN transistor Q4 having a motor M inserted in series on the collector side.

On the other hand, an NPN transistor Q5 is connected to the capacitor C in parallel when viewed from the resistors R5 and R3.
- The output side of monostable multivibrator MB is connected to the base of transistor Q5.

The input side of this monostable multivibrator MB is connected via a differential circuit F to a command switch for loading and unloading a cassette by autoloading. Here, the command switch is a cassette loading start switch (indicated by SW3 in FIG. 1) that detects that a cullet is inserted into the pack guide 1 and turns on the power to the motor, and a 1-pu player (not shown). This switch is installed on the front of the escutcheon and is activated when the deep player operator manually presses it.

80 Operation Next, the operation of the apparatus of this embodiment having the above-mentioned configuration will be explained.

(Before installing the cassette) Before installing the cassette, the slide plate 5 is located on the front side of the side plate 4, and the guide arm 2 is pressed by the elevating cam 6 provided on the slide plate 5 to the elevating position. be. Therefore, the pack guide 1 supported at the tip of the guide arm 2 is also supported in a floating state above the playing position of the cassette. At the same time, slide plate 5
In order to pull the guide roller 12 of the swing lever 1o outward, the loading/unloading cam 13 installed at The back stopper 9 is also stopped in front of the guide hole 8.

On the other hand, on the circuit, the slide plate 5 is located at the front and its actuating piece 17 presses the switch SW2, so
Installation completion switch SW1 at the back of tape play 1 is ON.
, the pressed detachment completion switch SW2 is OFF. Therefore, i
- A voltage is applied to the base of transistor Q1, 1- transistor Q1 is turned on, and PNP type transistor Q2 connected to the collector side of transistor Q1 is also turned on.

As a result, capacitor C is charged through resistor R5. Here, the values of resistor R5 and =I capacitor C are set such that their time constants are smaller than those of resistors R3, R4 and capacitor C, so capacitor C is quickly charged and therefore Schmitt A voltage is applied to the input side of the circuit S, and the Schmitt circuit S is turned on. As a result, the 1-transistor Q3 connected to this becomes 0N1Q
4 is OFF and 4C-)τ, the motor M is stopped with the cullet attachment and detachment completed.

(When starting to install Carrot) When the cassette is inserted into the pack guide 1, the installation start switch SW3 installed at the back of the pack guide 1 detects this, and the command from this switch SW3 is input to the differential circuit. Then, the monostable multivibrator MB is triggered, and a fixed time pulse is input to the base of transistor Q5, transistor Q5 is turned on, and capacitor C is turned on.At this time, the motor is still being driven. Hizu,
Since the slide plate 5 is also stopped, the IIRI completion switch SW2 is turned on again, and the transistor Q2 is also turned on, and the capacitor C is connected through the resistor R5.
However, since the transistor Q5 is ON, the potential of the capacitor C becomes equal to the collector-emitter saturation voltage of the transistor Q5. Therefore, no voltage is applied to the input side of the Schmitt circuit S, the Schmitt circuit S is turned off, and the transistor Q3 is turned off.
The FF transistor Q4 is turned on, and power is supplied to the motor M.

As a result, the drive gear 15 is rotated by the motor M, and since the rack 14 on the slide plate 5 side is engaged with this gear 17, the slide plate 5 starts moving toward the back of the tape player.

(During installation of the cassette) When the slide plate 5 starts to move, the device B2 cam 13 provided on the slide plate 5 presses the guide roller 12, and the swing lever 1 moves toward the back of the tape player.
Avoid rotating the tip of o. Then, the back stopper 9 that is engaged with the tip of the swing lever 1o is also pulled toward the back of the tape play V, but this back stopper 9
Since the claw 9a provided at the front end of the cassette is engaged with the reel shaft insertion hole of the cassette, the cassette is pulled by the back stopper 9 and reaches the inner part of the pack guide 1.

Even after the cassette reaches the inner part of the pack guide 1, the elevating cam 6 presses the guide bin 7 of the guide arm 2 downward. As a result, the guide arm 2 descends around the support shaft 3, and the pack guide 1 connected to the tip of the guide arm 2 also descends with the cassette stored therein, and the cassette is set at its playing position.

On the other hand, on the circuit, when the slide plate 5 starts moving,
The actuating piece 17 is separated from the attachment/detachment completion switch sw2, so that the switches sw1.8w2 are both turned on, and the transistors Q1 and Q2 are both turned off. Around this time, the pulse from the monostable multivibrator MB is cut off, and the transistor Q5 is turned off. As a result, charging of the capacitor C starts via the resistors R3 and R4. Since this charging time is set longer than the time from the start of driving to completion when the auto zeroing mechanism operates normally, charging of capacitor C will not be completed during driving under normal conditions. The motor will not stop even if the Schmitt circuit S turns ON.

(Cullet installation complete) When the cassette is set to the playing state and the slide plate 5 reaches the deep part of the deep play A7, the installation completion switch SW1 is pressed by the operating piece 16 of the slide plate (5) and turned OFF. Then, a voltage is applied to the base of transistor Q1 through resistor R1, and voltage is applied to the base of transistor Q1.
．． Both Q2 are turned ON. And]・Langister Q2
=1 ndenna C is rapidly charged through the resistor 5 connected to the resistor R and when the capacitor C reaches a predetermined potential, the resistor R
4, a voltage is applied to the Schmitt circuit S, and the Schmitt circuit S is turned on. As a result, transistor Q
3 is turned ON and t-transistor Q4 is turned OFF, the power supply to the motor M is cut off, and the motor M stops with the cassette installation completed.

(When attaching and detaching 71 sets) When attaching and detaching a cassette, contrary to the above, when a command pulse from the detachment start switch enters the differential circuit F, the short stable multivibrator M is triggered from 1 to generate a pulse for a predetermined period of time. Therefore, when transistor Q5 is turned on, capacitor C is discharged. When covered, Schmitt circuit S is turned off.
, 1 to transistor Q3 is OFF, transistor 04 is OFF
N, the power is turned on to the seventh motor M, and the attachment/detachment operation begins.

During the attachment/detachment operation, transistor Q5 turns OFF,
The capacitor C is charged from the resistor R3, Ill side, but before the potential reaches the value that turns on the Schmidts 1 to S circuits, the attachment/detachment operation is completed and the switch SW2 is turned OFF.
, F. As a result, transistor Q1. Q2 is ON
As a result, the U2:I transistor C is rapidly charged via the resistor R5, and the Schmitt circuit S is connected to the ON1 transistor Q.
3 is turned on, transistor Q4 is turned off, and motor M is stopped.

(14-When the loading mechanism is abnormal) If the mechanism stops due to human or mechanical factors during loading and unloading of the cassette, the pulse from the monostable multivibrator MB has already been interrupted, so the transistor Q5 is OF F
, and charging of capacitor C has started. At this point, since autoloading is in progress, both switches SWl and SW2 are turned on, and J5 is turned on. ]-Ransistor Q1. Since Q2 are both OFF, there is no rapid charging from the resistor R5 side. However, capacitor C
Then, the resistors R3 and R4 are gradually charged, and when the normal operating time passes while the mechanism is stopped, the potential of the capacitor C reaches a value that turns on the Schmitt circuit S. As a result, the transistor Q3 is turned on, the transistor Q4 is turned off, and the motor M is stopped.

In this way, if there is an abnormality in the autoloading mechanism and the loading of the cassette is not completed even after the time determined by the time constant of the capacitor °C and the resistors R3 and R4, the motor M will automatically stop. Its burnout is prevented.

In addition, in order to restart this stopped motor, apply a pulse to the differentiator circuit 1- with the autorope ink start switch, turn on the transistor Q5 via the monostable multivibrator MB, and discharge the capacitor C. good.

As described above, in this embodiment, the charging time of the capacitor υ determined by the resistance and the time constant of the capacitor υ is used as a timer, and the motor is stopped when the loading/unloading of the cassette exceeds a certain time. The J3 timer of the present invention is not limited to this.

For example, pulses are generated continuously based on the command of the autorope ink start switch, the number of pulses is counted up to 81 by a counter, and when normal, the loading/unloading completion switch SW1. It is also possible to re-hit the counter by opening and closing SW2, and in the event of an abnormality, to detect that the number of pulses counted by the counter exceeds a certain number and prevent the motor from stopping.

[Effects of the Invention] As described above, according to the present invention, when an accident occurs in the autoloading mechanism, overheating and burnout of the motor can be prevented, and failure of the device can be discovered at an early stage by stopping the motor. This has the effect of making repairs easier.

[Brief explanation of the drawing]

The drawings show an embodiment of the motor protection device for the A-towing mechanism according to the present invention, in which FIG. 1 is a plan view of the mechanism, FIG. 2 is a side view of FIG. The figure is a circuit diagram of a motor protection device. C...Cassette, SW 1...Li [completion switch, SW2...detaching completion switch, C...capacitor, R1-R5...resistance, 01-Q5...[-transistor, M ...Motor, S...Schmitt circuit, F
... Differential circuit, MB ... Monostable multivibrator, 1 ... Pack guide, 2 ... Guide arm, 3.
...Spindle, 4...Side plate, 5...Slide plate, 6...
・Elevating cam, 7... Guide pin, 8... Guide hole,
9...Pax 1~Brim, 10...Swing lever, 11...Pin, ]2...Kite roller, 13...
- Loading and unloading cam, 14... Rack, 15... Motor side gear V, 16.17... Operating piece.

Claims (1)

[Claims] (1) A switch that detects the completion of loading the cassette, a switch that detects the completion of loading and unloading the cassette, and a timer that starts operating in response to the start of loading and unloading the cassette, and this timer opens and closes the loading completion switch or the loading completion switch. and if the switch is not reset within a certain period of time, the power to the Δ-loading mechanism drive motor is cut off.
- Motor protection device of the loading mechanism. (2) The timer includes a Schmitt circuit connected to the motor power supply circuit, a capacitor connected to the Schmitt circuit, and a resistor connected to the capacitor,
The charging time of the capacitor determined by the time constant of this capacitor and resistor is
Furthermore, another resistor is connected to the capacitor and has a time constant such that the charging time is much shorter than that of the resistor, and this resistor is connected to the attachment completion switch and the detachment completion switch. A motor protection device for an autoloading mechanism according to claim 1, which is connected to a motor protection device for an autoloading mechanism.