JPS596520Y2 - Tape recorder operation drive device - Google Patents

Description

[Detailed description of the invention] This invention is a cassette tape recorder with fast forward and
The present invention relates to a mechanism that automatically shifts to a playing or ejecting state at the end of a magnetic tape during rewinding, and a drive device for a mechanism that automatically reverses the running direction of the magnetic tape.

Conventionally, in this type of device, the performance is stopped by optically or magnetically detecting the stoppage of the reel of the magnetic tape drive system at the end of the magnetic tape during performance, amplifying this detection signal, and using a solenoid, etc. The driving means is used to release the locking means of the play command lever to release the play operation.

In addition, the end of the magnetic tape is detected in the same way as described above to stop the fast forwarding and rewinding operations, and to switch the running direction of the magnetic tape, and the operating state is canceled by each independent solenoid.

As described above, the conventional device requires a large number of solenoids because each operation is driven by a dedicated drive source.

Furthermore, due to the characteristic that the suction force of the solenoid is inversely proportional to the square of the distance, the solenoid becomes more powerful than necessary due to the operation strokes of various levers and the like.

As a result, conventional devices have the drawbacks of being large, expensive, and consuming large amounts of current.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to obtain the necessary driving forces of mainly two systems using a motor as one driving source.

The operating drive device of the present invention uses a reduction gear train to increase the torque of the motor's rotational force, and uses this driving force to operate various operating levers and other members, making it possible to distribute the necessary speed and torque. It is designed to be integrated into one mechanism.

Hereinafter, the present invention will be specifically explained based on the drawings.

A tape recorder operation drive device 1 according to the present invention includes a motor 2 that can also serve as a drive source for running a magnetic tape.
Get rotation from.

Therefore, the belt 3 has a motor pulley 4 and a large pulley 5.
It is wrapped between.

The pulley 5 has a small gear 6 integral therewith, and this gear 6 is a composite gear 7a, 7b forming a reduction gear train.
, a composite gear Ha, 8b, and a gear 9 having a toothless portion 9b.

The pulley 5 and the gear 6 are rotatably inserted into the fixed shaft 11 of the base plate 10.

Gears 7a, 7b, gears 8a, 8b, and gear 9 are rotatably supported by respective rotating shafts 12, 13, 14 and bearings 15, 16, 17 attached to substrate 10.

The rotating shaft 16 is loosely inserted into the rotating shaft 16 so that the partially toothed gear 18 can freely rotate at its upper end.

This toothless gear 1B has toothless portions 1 at the 0° and 180° positions.
8a, 18b, and a crank pin 26 on the top surface.
and a cam 19 formed by a circumferential groove, and a pair of protrusions 20 on the lower surface.
a and 20b, respectively.

The cam 19 has projecting pieces 19a, 19b and clearance parts 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21b, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21a, 21b, e.g.
21b.

Further, the rotary shaft 13 supports a coil spring 23 as a frictional pull-in means by a stopper 22 at its tip, and its elastic force presses a friction plate 24 against the upper surface of the partially toothed gear 18.

A gear 25 fixed to the rotating shaft 12 is positioned to mesh with the partially toothed gear 18 on the output side of the gear train.

The crank pin 26 is located at a position corresponding to a pair of response pieces 27a and 27b of the reversing lever 27.

The reversing lever 27 has a substantially Y-shape, is swingably supported on the base plate 10 by a support shaft 28, and has a driving pin 2 at its tip.
9, which is linked to the magnetic tape running direction changing mechanism.

Further, the rotating shaft 14 has a crank cam plate 30 at its upper end.
is firmly supported.

This crank cam plate 30 is locked by a lock lever 31 at its locking portion 30a, and is constantly subjected to a clockwise rotational force by a pulling spring 43 hooked onto a drive pin 32.

This drive pin 32 is interlocked with a lever that pulls in/drops the cassette and presses the head/vinch roller.

Note that the lock lever 31 is supported by a support shaft 33,
Although it is always biased clockwise by a tension spring 34, it can be rotated counterclockwise by a plunger 36 of a solenoid 35.

Further, an L-shaped release lever 37 is attached to the bearing 17 so as to be freely rotatable, and the tension spring 3B biases the release lever 37 clockwise.

This release lever 37 is connected to the protrusion 2 with one driven piece 37a.
0 a and 20 b, and the notch 37 b caused by this movement is interlocked with a locking means of a fast forward/rewind lever (not shown).

Further, on the base plate 10, a starting lever 39 is supported by a support shaft 40 so as to be swingable on the base plate 10.

One end of the activation lever 39 is connected to a plunger 42 of a solenoid 41, and the other end is located on the cam 19 as an engaging pawl 39a.

Next, the operation will be explained.

The rotational force of the motor 2 is transmitted to the pulley 5 by the belt 3 in addition to the magnetic tape drive system, and is transmitted to the pulley 5 by the gears 6, 7a, 7b,
8a and 8b, the rotating shaft 12. Rotate 13.

At this time, the gear 9 does not mesh with the gear 8b on the output side due to the presence of a part of the toothless portion 9b, and therefore stops without rotating.

The rotation of the gears 7a and 7b is transmitted from the rotating shaft 12 to one gear 25 on the output side, and attempts to rotate the partially toothed gear 18.

However, the partially toothed gear 1B has partially toothed portions 18a and 18b at the 0° and 180° positions, and when the gear 25 is in the relief position, one protrusion 19b of the lumen 19 is attached to the activation lever 39.
Since the engagement pawl 39a of the gear 1B is in contact with the engagement claw 39a, the rotation of the partially toothed gear 1B is inhibited.

In this state, the reel stand of the magnetic tape drive system is driven by the motor 2, so the magnetic tape in the cassette is in a running state.

Now, when the magnetic tape reaches the end and the reel stand is locked, the electric circuit that was keeping it spinning detects the stoppage of the reel stand with a magnetic sensor, etc., amplifies the detection signal, and sends the solenoid 4 send to

Here, the solenoid 41 sucks the plunger 42 in the direction of the arrow, and disengages the engagement claw 39a at the other end of the activation lever 39 from the protruding piece 19a of the cam 19.

Incidentally, the rotating shaft 13 is constantly rotating, and is always biased counterclockwise by the frictional force of the friction plate 24 against the partially toothed gear 18 on the same axis.

Therefore, when the protrusion 19b is unlocked by the activation lever 39, the partially toothed gear 18 receives a frictional rotational force from the rotating shaft 13 and rotates counterclockwise, releasing the partially toothed portion 18a. The gear 25 then engages with the gear 25 and is then driven reliably through 180°.

At this time, the crank pin 26 of the partially toothed gear 18 hits the other response piece 27a of the reversing lever 27, and this reversing lever 2
7 in the clockwise direction about the support shaft 28.

The swinging motion of the reversing lever 27 operates a known running direction changing mechanism (not shown) by means of a drive pin 29 at its tip, thereby switching the running direction of the magnetic tape.

When the partially toothed gear 18 rotates 180 degrees, the other partially toothed portion 18b comes to the meshing position with the gear 25.
At that position, the partially toothed gear 1B stops rotating.

At the same time, the activation lever 39 is urged in the return direction by a tension spring or the like, so that the other protrusion 19a of the cam 19
corresponds to

The stopped state of the partially toothed gear 18 is maintained until the reversed magnetic tape reaches the end again.

Then, at the next end position of the magnetic tape, crank pin 2
6 hits the response piece 27b of the reversing lever 27 and displacing the reversing lever 27 counterclockwise around the spindle 28, so that the reversing lever 27 drives the running direction changing mechanism by its swing, and the magnetic tape runs. change direction.

Further, while the partially toothed gear 18 is rotating counterclockwise, the protrusion 20 b on the lower surface of the partially toothed gear 18 releases the driven piece 37 of the release lever 37 .
a, the release lever 37 rotates counterclockwise against the tension spring 3B during the first half of the rotation, and returns clockwise again under the tension of the tension spring 38 during the second half of the rotation.

This swinging movement of the release lever 37 is caused by the notch 37b at the other end.
to release the fast forward/rewind lever (not shown).

Further, the gear 9 does not mesh with the constantly rotating gear 8b because of its one toothless portion 9a, and does not rotate.

However, when the cassette is inserted, a switch (not shown) is closed in conjunction with this, so that the solenoid 35 is energized, and the lock lever 31 is connected to the crank cam plate 30.
Since the gear 9 comes off from the locking notch 30a,
Since it is temporarily biased clockwise by the tension of the tension spring 43 applied to the drive pin 32, it engages with the gear 8b, and is then reliably driven by the rotation of the gear 8b.

The gear 9 rotates the rotating shaft 14 and the crank cam plate 30, and the drive pin 32 of the crank cam plate 30
A lever or the like that engages with this is actuated to operate a known mechanism for pulling in and dropping the cassette.
Performs dropping operations and crimping operations of the vinyl roller.

The present invention brings about the following unique effects.

(1) Since the drive source can be configured as a single motor that is constantly rotating during performance, a drive source such as a solenoid is not required for each of the various predetermined operating mechanisms.

(2) The reduction gear train reduces the rotational force of one motor to increase the torque and provides a predetermined driving force to various operating mechanisms, so sufficient speed and driving force necessary for drive operation are ensured. .

(3) Since the gear train generates the driving force for the various operating mechanisms, a series of operating mechanisms related to performance can be integrated into one unit, and the device can be made smaller.

(4) Since the pull-in mechanism for the partially toothed gear is composed of the partially toothed portion and the rotational biasing spring or friction transmission, the operating speed is stable and there is no malfunction.

(5) Since the various operating levers are assembled on one board in relation to the gear mechanism, assembly and production of the mechanism parts is facilitated.

(6) Since the required auxiliary drive source is a solenoid for releasing the lock, a small one is sufficient, and the device is therefore inexpensive.

[Brief explanation of drawings]

FIG. 1 is a plan view of a tape recorder operation drive device according to the present invention, and FIG. 2 is a sectional view of the same device from the side. 1... Tape recorder operation drive device, 2...
...Motor, 6, 7a, 7b, 8a,
8b, 9...-Gear, 13... Rotation shaft, 18... Gear with missing teeth, 19... Cam, 20a, 20b... Protrusion , 23...
Coil spring, 24...Friction plate, 25...
... Gear, 26 ... Crank pin, 27.
...Reverse lever, 30...Crank cam plate, 31...Lock lever, 32...
Drive pin, 37...Release lever, 39...
・Start lever

Claims (3)

[Scope of utility model registration request] (1) A motor that constantly rotates while the tape recorder is in operation, a gear train that converts the rotation of this motor into a fixed speed ratio and drives multiple output gears, and a reversing lever that changes the running direction. A partially toothed gear having a protrusion that drives a crank pin to be driven and a release lever for rapid forwarding and rewinding, and a partially toothed gear that meshes with one gear of the gear train and has a partially toothed portion; a pull-in means which is energized in a certain rotational direction by the rotational force of the shaft; and a pull-in means for preventing the rotation of the partially toothed gear and allowing the partially toothed gear to rotate when the magnetic tape runs in reverse. a starting lever that engages with the cam; a partially toothed gear that is provided at a position where it meshes with the other gear of the gear train and has a partially toothed portion; It consists of a crank cam plate having a drive pin for retracting/dropping operations and crimping operations of the vinyl roller, and a lock lever that prevents rotation of this crank cam plate and allows rotation of the crank cam plate when inserting a cassette. An operation drive device for a tape recorder, characterized by the following. (2) The operation drive device for a tape recorder according to claim (1), wherein the motor also serves as a drive source for a magnetic tape drive system of the tape recorder. (3) The drawing means is composed of a coil spring inserted and fixed to the rotating shaft, and a friction plate attached to one end of the coil spring and in contact with the side surface of the partially toothed gear loosely fitted to the rotating shaft. An operation drive device for a tape recorder as set forth in claim (1) of the patented utility model.