JPS6029061Y2 - tape recorder - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder equipped with a tape tension detection means, and its purpose is to reduce the tape running load by separating the tape tension detection member from the tape during so-called cue and review during high-speed playback. The goal is to reduce it.

Conventionally, a tape recorder is known in which an increase in tape tension is detected by a detection member at the end of a cassette tape, and automatic stop operation is performed.In this type of tape recorder, the detection member is attached to the head board, When the board is advanced to put the tape recorder into a recording/playback state, the detection member is brought into pressure contact with the tape.

However, in this type of tape recorder, when performing a so-called cue or review operation in which the head board is slightly retracted and the pinch roller is released from the capstan while the head remains in contact with the tape to run the tape at high speed,
Since the detection member continues to apply pressure to the tape,
A problem arises in that the running load on the tape increases and the tape does not run smoothly.

To solve this problem, it is possible to move the head board back a lot and move the detection member away from the tape, but if you do this, the head will also be separated from the tape, and the intended purpose of running the tape at high speed while playing it will be reduced. This is not desirable because it makes it impossible to achieve the purpose.

Therefore, in the present invention, even if the head board is only slightly retracted, the detection member is moved greatly and separated from the tape.
The purpose is to reduce the running load, and one embodiment thereof will be described below with reference to the drawings.

In the figure, 1 is a fixed substrate, and a head substrate 2 is provided on this substrate 1 so as to be freely slidable in the force direction of arrow AB.

A magnetic head 3 is mounted on this head substrate 2.

Reference numeral 4 denotes a pinch roller lever rotatably supported by a shaft 5 provided on the fixed base plate 1, and a protrusion 4a integrally provided on the lower surface of the free end of this lever is a square notch 2a provided on the head base plate 2. is inserted into.

This lever 4 rotatably supports a pinch roller 7 with its shaft 6, and is urged to rotate clockwise by the other end of a torsion spring 8 whose one end is locked to the head base plate 2.

It goes without saying that this allowable rotation range is the range within which the protrusion 4a can move within the notch 2a.

Reference numeral 9 denotes a capstan which is rotatably provided on the fixed substrate 1 and is driven to rotate counterclockwise at a substantially constant speed by receiving the rotational force of a motor (not shown).
The magnetic tape 10a is driven to run at a constant speed by pressing the pinch roller 7 through the built-in magnetic tape 10a.

Reference numeral 11 denotes a tape recorder tension increase detection lever constituting an automatic stop device, and its substantially central portion is rotatably supported by a shaft 12 on the head substrate 2.

This lever 11 is provided with a cheap coater tension increase detector 13 at one end thereof, and the detector 13 is pressed against the tape 10a by a torsion spring 14 whose one end is latched to the head substrate 2, that is, in the figure. It is biased to rotate clockwise.

Further, a protrusion 11a provided on the side edge of the lever 11 near the pivot shaft 12 is opposed to a protrusion 4a of the pinch roller lever 4.

The operation of the above embodiment will now be explained.

When the playback button is pressed to move the head substrate 2 forward in the direction of arrow A from the stopped state, the playback state shown in FIG. 1 is achieved.

In this state, the head 3 is in contact with the tape 10a, the pinch roller 7 is pressed against the capstan 9 by the force of the spring 8, and the tape is driven to run at a constant speed. tape recorder 10
a, the tape recorder 10a is traveling with the tape recorder 10a bent greatly between the guides 10b and 10a of the cassette 10.

At this time, the protrusion 4a of the pinch roller lever 4 is in a position where it does not come into contact with the notch 2a of the head substrate 2, and the protrusion 11a of the tape tension increase detection lever 11 is also not in contact with the protrusion 4a.

In such a playback state, if the fast forward or rewind button is pressed without returning the playback button, the head substrate 2 will be slightly retracted in the direction of arrow B.

At the beginning of this backward movement, when the rotation support shaft 12 of the tape tension increase detection lever 11 moves, the protrusion 11a of the lever 11 engages with the protrusion 4a of the vinyl lever 4 and is moved. 11 is rotated counterclockwise to move the detector 13 away from the tape 10a.

Thereafter, the protrusion 4a of the pinch roller lever 4 engages with the periphery of the notch 2a of the head substrate 2 and is pushed, and the pinch roller 7 is separated from the capstan 9.

In this way, the final result is as shown in FIG. 2, until the detector 13 is completely separated from the tape 10a.
This no longer causes a high-speed running load on the tape.

It goes without saying that at this time, the head 3 remains in contact with the tape 10a.

As explained above, according to the tape recorder of the present invention,
Since the tape tension detection member can be completely separated from the tape during high-speed reproduction, the tape can be run with sufficient stability even if the high-speed running torque of the tape is reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the reproduction state of a tape recorder according to an embodiment of the present invention, and FIG. 2 is a plan view showing the same high-speed reproduction state. 1...Fixed board, 2...Head board,
2a...Notch, 4...Zench roller lever, 4a...Protrusion, 7...Zench roller, 9...Capstan, 10... ...Cassette, 10a...Tape, 11...
Tape tension increase detection lever.

Claims (1)

[Scope of utility model registration request] A head substrate slidably provided on a fixed substrate; a pinch roller lever rotatably provided on the fixed substrate and having a protrusion provided on a part thereof inserted into a notch in the head substrate; a pinch roller rotatably supported by the lever; a capstan rotatably provided on the fixed substrate and driving the tape to run at a constant speed together with the pinch roller; In the playback state where the head board is advanced and the pinch roller is pressed against the capstan, when the head board is slightly retracted by fast forwarding or rewinding, the rotation of the detecting member is detected at the initial stage. The side edge near the dynamic support shaft contacts the protrusion of the pinch roller lever, the detection member rotates, and one end of the detection member separates from the tape.
In the tape recorder, the protrusion of the pinch roller lever engages with the notch of the head substrate and is pushed and moved so that the pinch roller is separated from the capstan in the latter stage.