JPS5834015B2 - tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder in which a head panel equipped with a magnetic head and a pinch roller is operated by an electromagnetic plunger, and in particular, it is designed to prevent heating caused by the electromagnetic plunger.

A tape recorder has a head panel equipped with a magnetic head and a pinch roller operated by an electromagnetic plunger.
6. Conventionally known.

By the way, when pressing a button on this type of tape recorder, the head panel must be operated with a force greater than the pressing force between the pinch roller and the capstan shaft, so a large-capacity electromagnetic plunger is required. .

Therefore, it is undesirable to leave the plunger in an energized state for a long time because not only does it consume a large amount of power, but it also causes a decrease in the performance of the tape recorder itself due to heating.

Therefore, in the past, electromagnetic plungers were separately provided to hold the head panel in a predetermined operating position, the head panel was moved using both plungers, and after the head panel reached the predetermined operating position, only one of the plungers was used. A demagnetizing electromagnetic plunger was developed.

However, the provision of a separate electromagnetic plunger to hold the head panel in a predetermined operating position has the disadvantage of complicating the construction and increasing the size.

The present invention has been made in view of such problems, and the head panel is held at a predetermined operating position by using a brake release electromagnetic plunger for releasing the brake of the reel hub shaft, thereby creating a special head panel. It is an object of the present invention to provide a tape recorder that can prevent heating caused by an electromagnetic plunger without providing an electromagnetic plunger for holding.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

Figure 1 shows the head panel 1 and reel hub shaft 2a.

2b, the brake mechanism 4, etc., each reel hub shaft 2a, 2b has a pulley 3a, 3b at the lower end that serves as a reel stand, and both reel hub shafts 2a,
A tape cassette 5 is loaded into the tape cassette 2b.

The head panel 1 has an approximately L-shape with its right end extending forward, and has a pin 5a.

Although it moves forward and backward guided by the tape cassettes 6b and 6c, it is normally biased away from the tape cassette 5 by the return springs 7a and 7b.

The brake mechanism 4 is made of a plate spring material and includes a slide portion 9 that moves forward and backward guided by a pin 8, and brake shoes 10a and 10b extending to the left and right of the slide portion 9.

The brake mechanism 4 is always urged in the direction of the arrow by the brake spring 11, and the spring 11 presses the brake shoes 10a, 10b against the pulleys 3a, 3b to bring the reel hub shafts 2a, 2b to a stopped state. I try to keep it.

Two magnetic heads 12.1 are mounted on the top surface of the head panel 1.
3 and a pinch roller 14 are installed.

The pinch roller 14 is supported by a rotatable pinch arm 15, and is biased toward the tape cassette 5 by a spring 16 that is hooked between the pinch arm 15 and the head panel 1.

A capstan shaft 17 is arranged in front of the button and the pinch roller 14.

Engagement holes 18 and 19 are provided in the forwardly extending portion of the head 1, and one engagement hole 18 has an engagement hole protruding from one end of the head moving L' bar 20 shown in FIG. pin 2
0a, and the other engaging hole 19 has a locking pin 21a projecting from the middle part of the head holding lever 21 shown in FIG.
are inserted respectively.

The operation of each locking pin 20a, 21a will be explained later in FIG.

A locking protrusion 22 is provided in a protruding manner at the middle portion of the left side edge of the engagement hole 19 .

This locking protrusion 22 has a width that becomes narrower toward the right.
The front and rear edges are sloped.

Further, a normally open changeover switch 23 is arranged in front of the head panel 1.

In the figure, reference numeral 24 denotes an idler pulley which is located between the left and right boobies J3a and 3b and presses against one of the pulleys as appropriate to transmit the rotational force of a motor (not shown) to that pulley.

Further, in the figure, reference numeral 25 denotes a magnetic tape located within the tape cassette 5 and wound between the left and right reel hubs.

FIG. 2 shows the structure of the head panel 1 and the parts that operate the brake mechanism 4. In the figure, 26 is an electromagnetic plunger for moving the head, and 27 is an electromagnetic plunger shaft for releasing the brake that operates the brake mechanism 4.

The head moving electromagnetic plunger 26 is demagnetized in response to the closing of the changeover switch 23 shown in FIG. It has been taken.

In addition, 20 in the figure is a head moving lever whose intermediate portion is rotatably supported, and one end of this lever 201ti has an engaging pin 20a inserted into the engaging hole 18 of the head panel 1.
The other end is the movable body 26a of the electromagnetic plunger 26 for moving the head.
is engaged with.

The operating direction of the engaging pin 20a is substantially the same as the operating direction of the head panel 1. Therefore, when the plunger 26 is excited and the movable body 26a is pulled downward in the figure, the engaging pin 20a is moved from the head panel 1. Spring 1? a, 7b, and moves in the direction of the tape cassette 5.

Note that FIG. 1 shows the state before the head panel 1 moves toward the tape cassette 5, and FIG. 2 shows the state after the head panel 1 moves.

In addition, 21 in the figure is a head holding lever whose one end is rotatably supported, and this lever 21 is attached to the middle part of the head panel 1.
It has an engagement pin 21a that is inserted into the engagement hole 19 of , and the other end is engaged with the movable body 27a of the electromagnetic plunger 27 for brake release.

The operating direction of the engaging pin 21 is substantially orthogonal to the operating direction of the head panel 1. Therefore, when the plunger 27 is excited and the movable body 27a is bowed downward in the figure, the engaging pin 21a is moved into the engaging hole 19. This comes into contact with the rear edge of the engaging protrusion 22 that protrudes inward, thereby prohibiting the return operation of the head panel 1.

At this time, since the rear edge of the engagement protrusion 22 is inclined, the engagement pin 21a cannot be reliably brought into contact with the rear edge of the protrusion 22 by sufficiently rotating the head holding lever 21. Therefore, movement of the head panel 1 in the return direction can be reliably prohibited.

The movable body 27a of the brake release electromagnetic plunger 27 is further connected to the slide portion 9 of the brake mechanism 4, and when the movable body 27a is pulled downward in the drawing, the brake shoes 10a and iob are separated from the pulleys 3a and 3b. It is now possible to

In FIG. 2, 28 is an eject lever, and this lever 28 moves forward and backward guided by pins 29a and 29b.
By pushing forward, the tape cassette 5 is pulled out from the reel hub shafts 2a and 2b.

Further, the eject lever 28 is provided with a long hole 28a, and a locking recess 28b is formed on the left side of the long hole 28a.

In the figure, reference numeral 30 denotes an interlocking member that is provided to be movable forward and backward in a direction perpendicular to the eject lever 28, and this interlocking member 3
0 is a locking pin 30a inserted into the elongated hole 28a at one end.
and the other end is connected to the locking pin 2 of the head holding lever 21.
1a.

When the head holding lever 21 is rotated by the excitation operation of the brake release electromagnetic plunger 27, the interlocking member 3
0 moves to the left in the figure and locks the locking pin 30a into the recess 2.
The eject lever 28 enters into the inside of the eject lever 8b and prevents the eject lever 28 from moving forward.

First, when a predetermined recording or playback operation is performed, the head moving electromagnetic plunger 26 is energized, the movable body 26a is pulled rearward, and the head moving lever 20 is rotated counterclockwise. The locking pin 20a allows the head panel 1 to move forward.

Then, when the pinch roller 14 comes into pressure contact with the capstan shaft 17 and the magnetic head 12.13 comes into contact with the magnetic tape 25 in the tape cassette 5, the changeover switch 23 is closed at the tip of the head panel 1.

As a result, the head moving electromagnetic plunger 26 is demagnetized, but at the same time, the brake release electromagnetic plunger 27 is energized, the head holding lever 21 rotates, and the locking pin 21a comes into contact with the rear edge of the locking protrusion 22. , the head panel 1 is held in the forward position.

On the other hand, the brake shoe 10a of the brake mechanism 4 is activated by the excitation operation of the electromagnetic plunger 27 for brake release.

10b is separated from the pulleys 3a, 3b, allowing rotation of the reel hub shafts 3a, 3b.

Also, by rotating the head holding lever 210, the interlocking member 30
moves to the left, causing the locking pin 30a to enter into the locking recess 28b, thereby prohibiting forward movement of the eject lever 28.

The idler pulley 24 is one boo
The reel hub shaft 3a is rotated while the capstan shaft is rotated, and the magnetic tape 25 runs at a constant speed to enter a predetermined recording or playback state.

When the next stop operation is performed, the idler pulley 24
When it moves away from J 3 a and stops rotating, the capstan shaft 17 also stops rotating and the brake release electromagnetic plunger 27 is demagnetized.

As a result, the movable body 27a returns with the spring 11, and the brake shoes 10a and 10b of the brake mechanism 4 come into pressure contact with the boots J3a and 3b, and the head holding lever 21 rotates clockwise and returns to locking. Remove the pin 21a from the locking protrusion 22, and insert the locking pin 30a into the locking recess 2.
It will be removed from 8b.

Therefore, the head panel 1 is pulled by the springs 7a and 7b and returns to the stop position, and the eject lever 28 can be moved forward.

Further, in operations such as fast forwarding and rewinding, only the brake release electromagnetic plunger 27 needs to be energized.

That is, when the plunger 27 is energized, the brake mechanism 4 is pulled away from the booms J3a and 3b, so if the idler pulley 24 is rotated in this state and brought into pressure contact with the pulley 3a or 3b, fast forwarding or rewinding can be performed.

At this time, since the head panel 1 is at the stop position, the head holding lever 21 is rotated by the excitation operation of the plunger 2T, moving the locking pin 21a forward of the engagement protrusion 22, and simultaneously moving the locking pin 30a. It enters into the locking recess 28b of the eject lever 28, and the forward movement of the eject lever 28 is prohibited.

Therefore, with the tape recorder configured as described above, the force exerted by the electromagnetic plunger is very small even during recording and playback operations, and the configuration is simple and can be made smaller.

That is, the head moving electromagnetic plunger 26 must move the head panel 1 with a force greater than the pressing force between the pinch roller 14 and the capstan shaft 17, so it must have a large capacity. Since the electromagnetic plunger 27 only releases the brake,
A small capacity one is fine.

Then, the small-capacity brake release plunger 27 operates the head holding lever (head panel holding means) 21 and the interlocking member (eject locking means) 30 to hold the head panel 1 in a predetermined operating position and release the eject lever. (Eject mechanism) 28 is locked, the head moving plunger 26 is demagnetized during recording and playback operations, and only the small capacity brake release lever 27 is energized, so that the electromagnetic plunger 28 is locked during recording and playback operations. The heating is so slight that it hardly matters.

Moreover, since the brake release plunger 27 is originally provided for releasing the brake, there is no need to provide a separate plunger for holding the head panel 1, and the configuration can be simplified and made smaller. It is also possible to aim for

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view showing the arrangement of the head panel, reel hub shaft, etc.
The figure is a plan view showing the structure of the head panel and the part that operates the brake mechanism. 1... Head panel, 2a, 2b... Curved reel hub shaft, 4... Brake mechanism, 12, 13...
Curved magnetic head, 14...Pinch roller, 26.
...Electromagnetic plunger for head movement, 27...
...Electromagnetic plunger for brake release.

Claims (1)

[Claims] 1. A reel hub shaft that rotationally drives a reel hub in a tape cassette, a head panel that includes a magnetic head and a pinch roller and is elastically held in a position where the magnetic head and pinch roller are separated from the tape cassette by a return spring, and a brake spring. a brake mechanism elastically held in a position where rotation of the reel hub shaft is inhibited by the reel hub shaft, an electromagnetic plunger for moving the head that moves the head panel and positions the magnetic head and the pinch roller at predetermined operating positions, and a magnetic head and the pinch roller. a changeover switch that is switched in conjunction with the movement of the head panel when the roller reaches a predetermined operating position and demagnetizes the electromagnetic plunger for moving the head; a brake release electromagnetic plunger that holds the brake in a brake release position against the brake and operates a head panel holding means having an engaging portion that engages with an engaged portion of the head panel to prohibit the return operation of the head panel; A tape recorder comprising: an eject mechanism for removing a tape cassette from the reel hub shaft; and an eject lock means driven by the brake release electromagnetic plunger to lock the eject mechanism.