JPH0222807Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auto-reverse tape recorder, and more particularly to an improvement in the magnetic head switching means of a center capstan type auto-reverse tape recorder.

As is well known, the general configuration of center capstan type auto-reverse tape recorders has traditionally been
As shown in the figure, pins 1a, 1b, 1c are provided on a fixed chassis 1 on which a tape drive means consisting of reel stands 4a, 4b, a capstan 5, etc.
A movable chassis 2 is inserted into the long holes 2a, 2b, and 2c so as to be slidable back and forth.The movable chassis 2 has a generally doglegged shape and has forward and backward sections on both sides. Head chassis 3 each equipped with reverse magnetic heads H ₁ and H ₂
is rotatably supported approximately in the center by a pin 2d. Also headshisha 3
A pinch roller P is rotatably attached to a projecting portion 3a formed by extending and bending the upper rear edge.

On the other hand, a reversing spring 8 is disposed between the pin 6 on the fixed chassis and the pin 7 at one end of the head chassis 3, and the elastic force of the reversing spring 8 causes the head chassis 3 to be moved to the left or right by a head chassis switching means (not shown). The position where the forward magnetic head _H1 is brought into pressure contact with the magnetic tape T and the position where the reverse magnetic head _H2 is brought into pressure contact with the magnetic tape T are determined together with stoppers 9a and 9b provided on the movable chassis 2 by swinging to the right. It is designed to be selectively switched and maintained.

Therefore, in the head switching means of the auto-reversing tape recorder described above, the reversing spring 8 is always used.
This means that the elastic force is acting on the head chassis 3.

However, in general, an auto-reverse tape recorder must always start from a tape forward running state, so when moving the movable chassis 2 backward from a tape reverse running state to a stopped state, the head chassis 3 must be started from a tape forward running state. It is necessary to move the movable chassis 2 backward while changing the state, and in the conventional example described above, the elastic force of the reversing spring 8 is applied as a load to the operation button (not shown), which only makes the operation heavier. In addition, unnecessary force is applied to other members, which is undesirable. Furthermore, since the head chassis 3 swings in a see-saw manner, one end that is set back protrudes rearward, which not only requires extra space behind the head chassis 3, but also makes it difficult to install other members in this part. However, it had a serious drawback in that it was difficult to apply to small equipment.

The present invention was developed with the aim of eliminating all of the above-mentioned drawbacks, and is intended to be used in a center capstan type auto-reverse tape recorder having seesaw type head switching means, in which the head chassis is switched to tape forward or reverse running state and maintained. By configuring the reversing spring to be related to the back and forth movement of the movable chassis so that the elastic force of the reversing spring does not act when the movable chassis is in a backward and stopped state, the elastic force of the reversing spring does not become a load during operation. The present invention provides a new auto-reversing tape recorder that can reduce the space required by keeping the head chassis neutral when the tape recorder is stopped.

An embodiment of the auto-reverse tape recorder of the present invention shown in FIGS. 2 to 4 will be described in detail below.

In each figure, the same parts as those in the conventional one are given the same reference numerals. A movable chassis 2 is disposed so as to be able to slide forward and backward, and a head chassis 3, which is equipped with forward and reverse magnetic heads H ₁ and H ₂ on both sides of the movable chassis 2, is swingable with a pin 2d. It is arranged. Further, a pinch roller P is mounted on the head chassis 3, and a stopper 9a is mounted on the movable chassis 2, which holds the forward and reverse running positions of the head chassis 3 together with a reversing spring 8, which will be described later.
9b is provided.

On the other hand, 10 moves the head chassis 3 to the movable chassis 2.
A head chassis control member for controlling a reversing spring, which will be described later, in relation to the front-back sliding motion of the head chassis. A reversing spring 8 is disposed between the pin 10a provided at one end of the movable chassis 3 and the pin 12 at one end of the head chassis 3, and when the movable chassis 2 moves forward, the head chassis 3 switches to a head chassis (not shown). When the vehicle is switched to a forward or reverse running state by the means, each state is maintained together with the stopper 9a or 9b.

In addition, the pin 10b provided at the other end of the head chassis control member 10 is formed on the fixed chassis 1 and is connected to the engaging portion 13 formed of a first engaging portion 13a and a second engaging portion 13b having a step. The pins 10b of the head chassis control member 10 move from the first engagement portion 13a to the second engagement portion 13b or By changing the engagement position to the opposite direction, this is rotated and the elastic force of the reversing spring 8 is controlled.

The auto-reverse tape recorder of the present invention has the above-mentioned configuration, and its operation will be explained step by step.

FIG. 2 shows the tape forward running playback (or recording) state, in which the movable chassis 2 is in the forward state and the pinch roller P is attached to the capstan 5.
are pressed together with the magnetic tape T in between, and the forward magnetic head _H1 is brought into contact with the magnetic tape T.
This shows a state in which the magnetic tape T is running in the direction of arrow A. In this state, the pin 10b at one end of the head chassis control member 10 is engaged with the first engaging portion 13a of the engaging portion 13 on the fixed chassis 1 due to the forward movement of the movable chassis 2, and therefore the other end Pin 10a of head chassis 3
As it approaches the direction of pin 1, it ends up
Since the reversing spring 8 is compressed by the head 0a and the pin 12 of the head chassis 3 against its elastic force, the reversing spring 8 is compressed by the head chassis 3 together with the stopper 9a.
is maintained in a forward running state. In other words, in this state, the reversing spring 8 can perform a reversing operation to selectively swing the head chassis 3. When the tape running direction is reversed by a head chassis switching means (not shown), the head chassis 3 is moved to its position around the pin 2d. After a certain amount of rotation, the reverse action of the reversing spring 8 causes the head chassis 3 to rotate until the front edge of the reverse side head _H2 collides with the stopper 9b, and this state is maintained by the elastic force of the reversing spring 8 and the stopper 9b. By holding the tape in reverse, the tape runs in reverse as shown in FIG. Although not shown in the drawings, it goes without saying that in conjunction with the switching operation of the head chassis 3, the reel stand, capstan 5, etc. reverse the direction of rotation and are switched so that the magnetic tape T runs in the direction of arrow B.

Next, by pressing a stop button (not shown) to stop the movable chassis 2, the pinch roller P is separated from the capstan 5, and the reverse head _H2 is also separated from the magnetic tape T. As the movable chassis 2 retreats, the head chassis control member 10 also retreats, and the pin 10b at the tip moves from the first engagement portion 13a of the engagement portion 13 to the second engagement portion 13b. Eventually, the head is rotated clockwise around the shaft 11 by the elastic force of the reversing spring 8, and the pin 10a on which the reversing spring 8 is arranged is separated from the pin on the head chassis 3, and the head chassis 3 is pressed against the stopper 9b. The elastic force of the reversing spring 8 for holding the head is absorbed, and as a result, the head chassis 3 is at a neutral position with its front edge separated from both the stoppers 9a and 9b, as shown in FIG.

Therefore, when returning the movable chassis 2 to the stopped state, the elastic force of the reversing spring 8 is added as a load and does not interfere with the operation, and the operation can be performed with an extremely small force, making the operation lighter and reducing the burden on other members. No unnecessary force is applied to it. Further, in the stopped state, the head chassis 3 is in a neutral state, so that the amount of rearward protrusion of the end portion can be minimized, and space can be reduced.

On the other hand, when pressing the tape forward running playback button (not shown) from the stopped state shown in FIG. As the movable chassis 2 moves forward to the regeneration position, the head chassis control member 10
By changing the engagement position of the pin 10b at the tip from the second engagement part 13b of the engagement part 13 to the first engagement part 13a, the pin 10b rotates counterclockwise as seen in the figure, and the other end is reversed. Pin 10a with one leg of spring 8 attached
The head chassis 3 approaches the head chassis 3 and compresses the reversing spring 8 against its elastic force, thereby maintaining the reversing operation and each swinging position of the head chassis 3. Therefore, the elastic force of the reversing spring 8 can only be applied when the movable chassis 2 advances to a position where the tape is running, so the elastic force of the reversing spring 8 does not act as a load during operation. can be done with extremely light force. Note that there is a slope 1 between the first and second engaging portions 13a and 13b constituting the engaging portion 13.
3c, the engagement position of the pin 10b of the head chassis control member 10 can be changed smoothly.

As described above, according to the auto-reverse tape recorder of the present invention, the head chassis control member, which operates in conjunction with the forward and backward movement of the movable chassis, controls the elastic force of the reversing spring for switching the head chassis and maintaining the switching position. control,
In the stopped state, the elastic force of the reversing spring is absorbed or reduced, so that the elastic force of the reversing spring does not become a load during the stopping operation or when transitioning from the stopped state to the operating state, making it possible to operate. This can be done smoothly with a small force, and the head chassis is in a neutral position when stopped, which is advantageous in terms of space, and the configuration for this purpose is extremely simple.

[Brief explanation of the drawing]

FIG. 1 shows the structure of a conventional auto-reverse tape recorder, and FIGS. 2 through 4 all show the structure and operation of an embodiment of the auto-reverse tape recorder of the present invention. Explanation of symbols: 1... Fixed chassis, 2... Movable chassis, 3... Head chassis, 8... Reversing spring, 10... Head chassis control member, 13...
Engagement part.

Claims (1)

[Scope of utility model registration request] Equipped with a movable chassis that can be slid back and forth between the operating (playback or recording) position and the stop position,
An automatic head chassis having a substantially central portion pivotably supported on the movable chassis and having forward and reverse magnetic heads on both sides thereof and swinging to switch the magnetic heads according to the tape running direction. In the reverse tape recorder, one end on the movable chassis is connected to one end of the head chassis via a reversing spring, the other end is engaged with an engaging portion provided on the fixed chassis, and the tape is connected to the front and rear of the movable chassis. A head chassis control member that operates in conjunction with the movement of the movable chassis is provided, and the head chassis control member is operated by the back and forth movement of the movable chassis to control the elastic force of the reversing spring, so that when the movable chassis is in the operating position, The reversing spring is provided with an elastic force to selectively hold the swinging position of the head chassis, and in a stopped state, the elastic force of the reversing spring is absorbed or reduced. Auto reverse tape recorder.