JPS5819715Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a magnetic recording and reproducing device, and in particular to a mechanism that automatically forms a non-recorded portion for a certain period of time after a recorded portion. The purpose is to enable the formation of non-recorded portions with simple operations.

Traditionally, a predetermined length of unrecorded portion is formed between recorded portions of magnetic tape, and this unrecorded portion is detected during playback to automatically locate the beginning of the recorded portion. .

Therefore, in order to create this unrecorded part, if the device is equipped with a volume for adjusting the recording level, it can be done by turning down the volume after recording is completed and cutting off the recording signal, or by using a device that automatically adjusts the recording level. If there is, the recording signal line is grounded, etc. to cut off the recording signal □ A neat switch was installed, and the switch was operated after recording was completed.7>Q In both cases, at the final stage, the stop button was operated. It is necessary to take measures to stop the running of the tape, and two operations are required.

Therefore, the present invention aims to simplify the configuration and improve the reliability of operation by making it possible to form a non-recorded part with a single operation, and by performing the forming operation of the non-recorded part purely mechanically. More specifically, we focused on the automatic stop mechanism that automatically stops the device by unlocking the operation button when the magnetic tape reaches the end, and uses this to stop the unrecorded portion. This is intended to cause the formation operation to be performed.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the main mechanisms of the magnetic recording/reproducing device of this embodiment, particularly a tape recorder using a cassette tape.This mechanism can be broadly divided into a tape end detection mechanism and an automatic stop mechanism consisting of an automatic lock release mechanism. It can be divided into a recording mute mechanism and a recording mute mechanism.

Let's start with the automatic stop mechanism. First, there is the automatic lock release mechanism that automatically moves the lock plate 1 that locks the tape running operation button in the operating position at the end of the tape to automatically unlock the tape running operation button. I will explain about it.

A pulley 5 is rotatably provided on a shaft 4 installed near the capstan 3 of the main board 2.

3a shows a capstan wheel.

The outer periphery of the pulley 5 is pressed against a pulley 6 coaxially fixed to the capstan 3, so that the pulley 5 rotates integrally with the rotation of the capstan 3.

A gear 5 is provided coaxially with the pulley 5, and this gear 7 is supported by a shaft 8 on the main board 2 and meshed with a rotatable cam gear 9.

Therefore, the cam gear 9 is configured to always rotate while the capstan 3 is rotating.

An eccentric cam 10 is integrally provided at the center of the cam gear 9, and a pawl 11 is provided on the outer periphery of the eccentric cam 10.

The eccentric cam 10 is disposed within the aperture 13 of the lever 12, and a part of the periphery of the aperture 13 is provided with the eccentric cam 10.
A pawl 14 that can engage with the pawl 11 of 0 is formed.

The buttons 11 and 14 are set so that they can be engaged only when the cam gear 10 is rotating counterclockwise.

Further, one end of the lever 12 is rotatably connected to a substantially central portion of the end detection lever 15 by a pin 16.

This end detection lever 15 is rotatably provided on the shaft 11 on the main board 2, and the other end side edge is in contact with a friction pin 19, 20 provided on the outer periphery of the take-up reel stand 18.

The friction pins 19 and 20 are coupled to the take-up reel stand 18 with weak friction, and the reel stand 1
8 is transmitted to the end detection lever 15 to rotate the lever 15 clockwise around the shaft 17, but the rotation itself for winding the tape of the take-up reel stand 18 is hardly affected. It is configured so that it does not.

The free end of the lever 12Q is inserted into and engaged with a groove 23 of a rotating arm 22 that is rotatable around a shaft 21 of the main board 2.

A four part 24 is provided on the right side of the free end of the lever 12, and when the lever 12 is rotated clockwise by the rotation of the pin 16, the side wall of the rotating arm 22 is inserted into the recess 24, and the rotating arm is inserted into the recess 24. 22 is configured to be able to rotate counterclockwise around the shaft 21.

The rotating arm 22 is urged to rotate clockwise by a tension spring 25, and normally the free end of the lever 12 is in a straight line in the groove 23 of the rotating arm 22, as shown in FIG. has been stopped.

The structure of the above-mentioned pulsation lock release mechanism 75\Next, its operation will be explained.

First, we will explain the basic operation of the mechanism itself, but first, we will start with the operation of the parts related to the above-mentioned release mechanism.

The capstan 3 is rotated counterclockwise during any recording, playback, fast forwarding, or rewinding operation.

During recording, playback, or fast-forwarding, the take-up reel stand 18 is rotated and driven counterclockwise by the rotational force of the capstan 3 transmitted by a motion transmission mechanism such as an idler (not shown), and is rotated and driven from the supply reel stand 26. Wind up the tape you pulled out, but
During rewinding, the supply reel stand 26 winds up the tape, so the take-up reel stand 18 is pulled by the tape wound on the supply reel 26 and rotated clockwise.

As described above, since the capstan 3 is always rotated counterclockwise when the vehicle is traveling, the cam gear 9 is also always rotated counterclockwise.

Also, no matter which direction the take-up reel stand 18 rotates, if the friction pins 19 and 20 are scratched, the end detection lever 1
5 in the direction of arrow A to urge the lever 15 to rotate clockwise around the shaft 17.

Therefore, the cam 10 of the cam gear 9 comes into contact with the circumference of the opening 13 provided in the lever 12, and the lever 12 moves back and forth in the force direction of the arrow AB as the cam 10 rotates. The pawl 11 of 10 is sized so as not to engage with the pawl 14 of the lever 12.

However, as mentioned above, the tape used in this device is a cassette tape, and both ends of the tape are fixed to two reel hubs, so when the tape reaches its end, the take-up reel stand 18 stops rotating. The detection lever 15 is also no longer biased by the friction pin.

At this time, since cam gear 9 has been rotating in the past, lever 1
2 is moved in the direction of arrow B by the rotation of the cam 10, and its claw 11 engages with the claw 14 of the lever 12, pushing the lever 12 in the direction of arrow C.

Therefore, the lever 12 is rotated clockwise about the shaft 16, and the rotating arm 22 is rotated a certain amount counterclockwise about the shaft 21 against the force of the tension spring 25.

By this counterclockwise rotation of the rotation arm 22, the lock plate 1 is pushed in the direction of arrow C, and the lock of the tape running operation button is released dynamically.

Here, by changing the amount of movement of the lock plate 1 in the direction of arrow C and changing the amount of locking of the rod lock portion, it is possible to select the operation button to be unlocked.

The amount of movement of the lock plate 1 in the direction of arrow C can be changed by rotating the rotating arm 22 by a certain amount at the end of the tape in the automatic lock release mechanism.

This is a kick lever 21 rotatably provided on the lock plate 1.
This is done by changing the position of.

That is, when the tape running operation button is pressed to lock it in the suppressing position, the locking plate 1 returns to the same position as when stopped, so the first position of the kick lever 21 is moved as shown in FIG.
The concave portion 27a faces the convex portion 22a of the rotating arm 22.

Therefore, when the rotating arm 22 is rotated counterclockwise at the end of the tape, its convex portion 22a engages with the first concave portion 27a of the suck lever 21, causing the lock plate 1 to move in the direction indicated by the arrow
move in the direction.

At this time, the movement amount L1 of the lock plate 1 is equal to the protrusion 1 of the lock plate 1.
The strokes are such that c and ld can be released from the locking groove 28a of the rewind rod 28 or the locking groove 29a of the fast-forward rod 29 to unlock the rewind button or the fast-forward button,
And even if the locking groove 3Qa of the playback rod 30 or the locking groove 31a of the recording rod 31 is locked in the operating position by being locked in the protrusion 1bsla of the lock plate 1, the groove 30a is
= Stroke L1 in which the protrusions 1b and 1a do not separate from 31a and are not unlocked.

This means that the locking amount Sl of the fast forwarding rod 28 and the rewinding rod 29 is set to S1≦L1, and the reproducing rod 30 and the recording rod 31
This can be realized by setting the lock amount S2 to 82>Ll.

Therefore, the claw 11 of the eccentric cam 10 and the lever 1 for the first time
Movement stroke L of lock plate 1 due to engagement of pawl 14 of No. 2
1, the playback button and the recording button are unlocked. 4. When the first release operation is completed, the lock plate 1 is fitted with a tension spring to return the playback rod 30 and the recording rod 31 to their original positions. Stroke 1 depending on power
The rotating arm 22 is held at that position in the moved state and rotates clockwise by the tension spring 25, and the kick lever 27 is rotated clockwise by the tension spring 25.
The rotation arm 22 is disengaged.

When the kick lever 27 and the rotating arm 22 are disengaged, the kick lever 27 is rotated counterclockwise by the tension spring 32 - the second recess 27b of the kick lever 21
is opposed to the convex portion 22a of the rotating arm 22.

At the end of the tape when the button is pressed in this state, the rotating arm 22 is rotated counterclockwise in the same manner as described above, and its convex portion 22a engages with the second concave portion 27b of the kick lever 27, causing the lock plate 1 to move in the direction of arrow C. It is further moved by a moving amount L2.

Set the lock amount S2 between the playback rod 30 and the recording shoe bottom 31 to S2.
≦L1+L2 and the play button and record button are moved by this amount L2
The lock will be released and the device will be in a stopped state.

In the figure, numeral 33 is a leaf spring that urges the lock plate 1 in the direction of the arrow, and numeral 34 is a stopper that positions the kink lever 27 in the stopped state.

The above is an explanation of the pulsation stopping mechanism. Next, a recording neat mechanism using the above-mentioned automatic stop mechanism will be explained.

In FIG. 1, a recording mute rod 35 is mounted on the main board 2 and slides in the direction of the arrow AB.

On this rod 35 are a lock pin 36, a pin 37, and a spring 3.
8 is attached, and this recording mute rod 35 is biased in the direction of arrow B by a spring 39.

A sub-board 40 is formed on the upper surface of the main board 2 at a predetermined interval.
is fixed, and on this sub-board 40, a head board 41 on which a recording/reproducing head (not shown), an erasing head (not shown), etc. are attached is arranged so as to be slidable in the force direction of arrow AB by a guide member. ing.

This head substrate 41 is moved in the direction of arrow A by the operation of the regeneration rod 30, as is well known.

A lock lever 42 is mounted on the sub-board 40 so as to be rotatable about a shaft 43 on the sub-board 40, and is urged to rotate counterclockwise by a spring 44. Normally, one end 42a of the lock lever 42 is is in contact with the side portion 41a of the head substrate 41.

Further, a switch 45 is mounted on the sub-board 40.

Normally, this switch 45 is turned on by pin 31.

This switch 45 is interposed in series in the line leading the recording signal to the recording head.

The structure of the 75 percussion record dome mechanism has been described above, and its operation will now be explained.

First, the reproducing rod 30 and the recording rod are simultaneously operated and locked by the lock plate 1, thereby operating the recording circuit and the erasing circuit, and moving the head board 41 in the direction of arrow A to run the tape and enter the recording state.

When the head board 41 is moved in the direction of arrow A, the lock lever 42 is moved by the spring 44 to the one end 42 of the lock lever 42.
The shaft 43 is connected at l where a and the inclined portion 41b of the head substrate 41 touch.
The other end 42b of the lock lever 42 and the lock pin 36 on the rod 35 can be engaged with each other by rotating counterclockwise around the center.

When the recording mute button is pressed here, the lock pin 36 and the hook portion 42b at the other end of the lock lever 42 are engaged, and the rod 35 is completely locked in the operating position.

Pin 31 on the housing recording mute rod 35 is switch 4
5 and turn off the switch 45, the spring 38 attached to the end of the rod 35 pushes the end 46 of the end detection lever 1.5 from the 7 riction force of the friction pin 20 in the direction of the arrow A and pushes the lever 15 up into the axis. The claw 14 of the lever 12 and the claw 11 of the cam 10 are engaged with each other by rotating the lever 11 in the counterclockwise direction, and the automatic stop mechanism is activated.

As mentioned earlier in the explanation of the automatic stop mechanism, the playback button and the record button cannot be unlocked during the movement stroke L1 of the lock plate 1 caused by the first engagement of the claws 14 and 11, and the second engagement of the claws 14 The two phases are unlocked by the movement stroke L2 of the lock plate 1 caused by the engagement of the claws 11 and 11.

As the playback and recording buttons are unlocked, the head board 41 moves in the direction of arrow B, and the side 41a of the board 41 comes into contact with one end 42a of the lock lever 42, causing the lock lever 42 to rotate clockwise. Recording mute rod 35
The upper lock bin 36 and the hook portion 42b of the lock lever 42 are disengaged, and the recording mute button is unlocked and automatically returned to its original position.

Here, if the time required for the cam 10 to rotate once is t, it takes time t to 2t from when the recording mute button is pressed to when the playback button and the recording button are unlocked and the running of the tape is stopped.

Therefore, if the switch 45 is turned off to cut off the transmission of the recorded signal and only the erasing circuit is operated, a non-recorded area is dynamically created on the tape for a period of time t to 2t after the end of recording.

As explained above, the magnetic recording/reproducing device of the present invention activates the automatic stop mechanism by performing the recording mute operation, and until this mechanism operates and the device stops, unrecorded portions are not formed. It is designed to be able to operate at a low cost by using an automatic stop mechanism, and operates reliably, and is very easy to use since it only requires one operation.

[Brief explanation of drawings]

Fig. 1 is a plan view of a magnetic recording/reproducing device according to an embodiment of the present invention, Figs. 2 and 3 are front views of the main parts of the device, and Fig. 4 shows the operating state of the recording mute mechanism of the device. FIG. 1...Lock plate, 3...Capstan, 10...Eccentric cam, 11...Claw, 1
2...Lever, 14...Claw, 15...
...End detection lever, 18...Take-up reel stand, 19,20...Friction pin, 30.
...--Playback rod, 31...Recording rod,
35... Recording mute rod, 40...
・Recording signal cutoff switch, 41...Head board, 42...Lock lever -0

Claims (1)

[Scope of utility model registration request] a locking mechanism that holds the tape running operation button in the operating position;
A tape end detection mechanism detects that the tape has reached the end, and when the tape end detection mechanism detects the end of the tape, the lock mechanism automatically releases the state in which the tape running operation button is held at the operating position. A magnetic recording and reproducing device equipped with an automatic lock release mechanism, comprising a recording mute button, a switch means for cutting off a recording signal when the recording mute button is operated, and an activation means for operating the tape end detection mechanism. When the recording mute button is operated in the recording state, the tape end detection mechanism is activated and the automatic lock release mechanism is activated, and the tape end detection mechanism and automatic lock release mechanism are activated to stop the tape from running. A magnetic recording/reproducing device characterized in that, in the past, only an erasing operation was performed and an unrecorded portion was dynamically formed after a recorded portion.