JPH034985Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an end stop mechanism for a tape recorder using a cassette, and specifically aims to stabilize the operation by ensuring that the motor is stopped using a detection signal that detects the end of the tape. be.

Conventionally, there is a method of detecting the end of a tape recorder's tape and stopping the motor by mechanically turning off the motor using tape tension caused by stopping tape feeding.
A load is applied to the tape, or the tape tension differs between playback and recording and fast forwarding, which causes instability in operation.

Therefore, the present invention electrically detects the end of the tape,
The stopped state of the motor is maintained by mechanical means, and the stopped state is reliably maintained.

The present invention will be explained below based on examples.
Reference numeral 1 denotes a head plate equipped with a magnetic head (not shown), which is provided on a substrate (not shown) so as to be slidable in the left-right direction by engagement between a protruding shaft 2 and a long hole 3; A tongue 4 with an inclined edge 4' is provided at the side end. Reference numeral 5 designates a release lever whose middle part is pivotally mounted 6 on the base plate, and one end 5a of which is bent into an L shape and has an inclined edge 5' on its inner edge opposite to the inclined edge 4' of the tongue piece 4. , the other end 5b corresponds to a switch actuating member 7, which will be described later, and is constantly applied with an outward rotational force by a spring 26. 8 is an electromagnetic plunger having a restoring spring 9 and a hook member 11 having a hook 10 at one end. 7 is a switch operating member and the hook member 11
a notch 13 that locks the
An engaging portion 15 and a protruding shaft 16 for receiving the other end portion 5b of the release lever 5 are formed, respectively, and these are rotatably pivoted 17 to the lower surface of the substrate. Reference numeral 18 denotes a ratchet member whose proximal end is pivotally mounted 19 on the base plate, and a spring 20 constantly applies inward elasticity.
The free end selectively engages with the engaging portions 14 and 15 to regulate the position of the switch actuating member 7. 21,2
2 is a reel shaft, 23 is a first switch, 24 is a second switch, and 25 is a motor, which are connected in series to a power source, and the first switch 23 is closed when a cassette is inserted; It opens when the cassette is ejected, and the second switch 24 opens and closes when the switch operating member 7 rotates.

When a cassette (not shown) is inserted, the first switch automatically closes and the head plate 1 moves from the solid line in FIG. 1 to the imaginary position and approaches the reel shafts 21 and 22. At the same time, although not shown, the magnetic head comes into contact with the magnetic tape, and the pinch roller comes into pressure contact with the capstan. Further, the release lever 5 has one end 5
The pressure contact between the inclined edge 5' of the tongue 4 and the inclined edge 4' of the tongue piece 4 is released, and the spring 26 rotates inward (clockwise). Then, the one end 5a comes into contact with the side edge of the head plate 1 and its rotation stops (the position shown by the imaginary line).Thereby, the distance between the other end 5b of the lever 5 and the protruding shaft 16 increases, and the series of these The operation is almost instantaneous, and the tape is wound by one of the reel shafts to begin playback and recording.

When the winding of the tape reaches its end, the rotation of the reel shaft is stopped, and the electromagnetic plunger 8 is activated by a tape end detection signal generated from a known Hall element (not shown). Then, the hook member 11 is pulled against the restoring spring 9, and the switch actuating member 7 is rotated counterclockwise by the hook 10, so that the switch actuating member 7 is rotated as shown in FIG. The notch 13 is the second switch 24
is opened, the rotation of the motor 25 is stopped, and the winding of the tape is stopped. The rotational position of the switch actuating member 7 is maintained by the free end of the ratchet member 18 engaging with the second engaging portion 15, and the protruding shaft 16 approaches the other end 5b of the release lever 5.

After that, the plunger 8 is moved to the restoring spring 9
2, and the hook member 11 is moved from the position shown by the solid line in FIG. 2 to the position shown by the imaginary line in the same figure.

Next, when the cassette is ejected from the tape end stopped state shown in FIG. 2, the head plate 1 slides to the right in FIG. ′ are in contact with
Due to its inclination, the release lever 5 is moved by the spring 26.
As a result, the other end 5b of the release lever 5 presses the protruding shaft 16 and rotates the switch actuating member 7 clockwise. When the switch 24 is closed and the cassette is ejected, the first switch 23 is opened, and the motor 25 is therefore kept stopped.

As described above, according to the present invention, since the tape end detection signal is used to mechanically operate the open/close switch of the motor circuit to maintain the motor in a stopped state, it is possible to ensure that the motor is in a stopped state. It also has advantages such as stable operation and simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view in a non-playing state, FIG. 2 is a plan view in a playing state, and FIG. 3 is a motor circuit diagram. In the figure, 1 is the head plate, 5 is the release lever, and 7
8 is a switch operating member, 8 is an electromagnetic plunger, 9 is a switch operating member.
11 is a restoring spring, 11 is a hook member, 18 is a ratchet member, 23 is a first switch, 24 is a second switch, and 25 is a motor.

Claims (1)

[Scope of utility model registration request] a first switch connected in series with the motor, closed when a cassette is inserted and opened when ejected; a second switch connected in series with the first switch; and an electromagnetic plunger activated by a tape end detection signal. A tape end stop mechanism for a tape player, comprising a switch operating member that opens the second switch when the electromagnetic plunger is operated and closes the switch when the cassette is ejected.