JPS6236Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic stop device for a tape recorder that automatically stops the tape recorder by utilizing the tension generated at the tape end of a tape cassette.

Conventional automatic stop devices for tape recorders of this type require a considerable amount of tension to be generated at the tape end, and therefore it takes a considerable amount of time from the time the tape reaches the tape end until the tape recorder automatically stops. There was a drawback in terms of response performance that required . In addition, since the detection piece of the tension detection lever at the tape end was always fixed to the tape and in sliding contact, a load was applied to the tape while it was running.
In addition to interfering with the stable running of the tape, it also had the disadvantage of causing scratches on the tape.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic stop device for a tape recorder that eliminates the drawbacks of the prior art described above.

The basic feature of the present invention is that the tape recorder can be selectively set to an operating state or a non-operating state, and the tape recorder is always locked to an operation setting lever that has a self-returning force in the direction of setting the non-operating state. A rotary lever is disposed near the tape conveying path of the tape recorder, a roller that contacts the magnetic tape is pivotally supported at one end of the rotary lever, and a rotary lever is provided at the other end of the rotary lever. A locking surface is formed that engages with the locking protrusion to maintain the operation setting lever in the operating state of the tape recorder, and acts on the rotary lever so that the roller engages the magnetic tape. A spring means is provided that biases the roller to rotate in the direction of contact and acts on the roller with an acting force weaker than the tension at the end of winding of the magnetic tape, and acts on the rotary lever so that the rotary lever The roller is urged to rotate in a direction away from the magnetic tape, and when the operation setting lever is in the operating state, no acting force acts on the rotating lever, and the acting force is applied to the first spring means. The point is that another spring means whose force is larger than the acting force is provided.

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

In FIG. 1, 1 is a board of a tape recorder. A fulcrum shaft 2 is press-fitted onto the upper side of the substrate 1, and a rotary lever 4, which is prevented from coming off by an E-ring 3, is rotatably inserted into the shaft 2. The rotary lever 4 consists of a longitudinal arm 4a and a short arm 4b, and a tape tension detection roller 5 is attached to the longitudinal arm 4a via a bush 5a to rotate it. An anchoring pin 6 that can be pivotally supported is press-fitted and fixed. The tip 6a of this pin 6 is provided for engagement with a spring for forward motion of the roller and a spring for backward motion of the roller, and is inserted through a window 1a provided in the substrate 1, as shown in FIG. and protrudes from the bottom of the substrate 1. The pin 7a provided on the lower side of the substrate 1 has a tip end 6a.
A coil spring 7 for forward movement of the roller is locked, which is always engaged with the lever 4 to always bias the rotation lever 4 in the direction in which the tape B of the tape cassette A is located.
Note that 7b is a stopper member for this coil spring 7.

On the other hand, the short arm portion 4b of the rotating lever 4 has a
A locking pin 8 is press-fitted and fixed, and the locking pin 8 has a half-moon-shaped locking portion 8a that locks an operation setting lever 9 for play, etc. of the tape recorder when the tape recorder is in operation. There is. The locking portion 8a is projected downward through the window 1a of the base plate 1, and faces the forward and backward movement ranges of the operation setting lever 9. The operation setting lever 9 located on the lower side of the board 1 has a locking surface 8 of a half-moon-shaped locking portion 8a.
A protrusion 9a that engages with the base plate 1 and a bent portion 9b that engages with a coil spring 10 for backward movement of the roller located below the base plate 1 are formed. This coil spring 10
The coil spring 1 is designed to rotate and bias the rotary lever 4 in the opposite direction to the coil spring 7.
The force that 0 acts on the roller 5 is the coil spring 7
is set to be slightly larger than the acting force acting on the roller 5. In this case, the forces acting on the coil springs 10 and 7 are set in consideration of the locking force of the locking portion 8a that locks the operation setting lever 9 and the tape tension at the tape end. Note that the pin 10a provided on the board 1 is connected to the coil spring 10.
10b is a stopper member for this coil spring 10.

Hereinafter, the operation of the present invention will be explained using FIGS. 3, 4, and 5.

In FIG. 3, when the operation setting lever 9 is moved forward in the direction in which the tape B of the tape cassette A is located, the bent portion 9b of the operation setting lever 9 comes into contact with the coil spring 10.

As a result, the acting force of the coil spring 10, which biases the rotary lever 4 to rotate in the direction opposite to the direction in which the tape B is positioned, is weakened, and the rotary lever 4 is moved around the shaft 2 by the coil spring 7, is rotated in the direction in which it is located. In this case, the coil spring 10 and the tip 6a of the pin 6 are in contact with each other while the pivot lever 4 is pivoting. The rotation of the rotation lever 4 causes the roller 5 to move forward in the direction in which the tape B is positioned, and the roller 5 comes into contact with the tape B, and the protrusion 9a of the operation setting lever 9 engages the half-moon-shaped locking portion 8a. The operation setting lever 9 comes into contact with the locking surface 8b, and the operation setting lever 9 is locked with the locking surface 8b. That is, it is locked in the state shown in FIG.

In FIG. 5, with the operation setting lever 9 locked on the locking surface 8b, the tape B is run, played back, etc., and when the tape reaches the end, the tension of the tape B is It increases compared to when tape B is running. As a result, due to the tension of the tape, the roller 5 is moved slightly backward in the direction opposite to the direction in which the tape cassette A is located, and this causes the rotary lever 4 to move around the shaft 2 in the direction opposite to the direction in which the tape B is located. direction, and the lock of the operation setting lever 9 is released. After this, the coil spring 10 comes into contact with the tip 6a of the pin 6. At this time, since the acting force of the coil spring 10 for backward movement is set to be stronger than the acting force of the coil spring 7 for forward movement, the action setting lever 9 and the rotation lever 4 are controlled by the acting force of this coil spring 10. be restored to its original state.

Note that instead of providing this coil spring 10,
The action setting lever 9 is provided with a return spring, and the action force of the return spring is set to be stronger than the action force of the coil spring 7. Of course, an engaging bent portion may be formed.

Furthermore, the operation setting lever 9 is not limited to a lever for play;
Of course, it may be a rewind lever or a first forward lever. When each of these levers is provided with an automatic stop function of the tape recorder, these levers are provided one on top of the other, and the coil spring 10 and the bent portion provided on each of these levers are brought into contact with each other. Of course, if this is done, automatic stopping will be performed for each lever.

The present invention has an automatic stop device for a tape recorder configured as described above, so that the operation setting lever can be released with a simple configuration while the tape tension at the tape end is small, and the roller can be slid against the tape. Since the structure is such that they are in contact with each other, it is possible to reduce the load applied to the tape during tape running, and this has the effect of improving the running stability of the tape. Furthermore, it also has the effect of preventing scratches and the like that occur on the tape.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a partial configuration of an automatic stop device for a tape recorder according to the present invention, and FIG. 2 is an exploded perspective view showing main parts of the automatic stop device according to the present invention.
Fig. 3 is an explanatory diagram showing the state of the tape recorder before the operation is set, Fig. 4 is a partial diagram illustrating the locked state of the operation setting lever, and Fig. 5 is an explanatory diagram showing the state of the tape recorder after the operation is set. It is. 4... Lever, 5... Roller, 7... Coil spring for forward motion, 8... Locking pin, 8a... Locking portion, 8b... Locking surface, 9... Operation setting lever, 1
0... Coil spring for double action.

Claims (1)

[Claims for Utility Model Registration] (1) A locking protrusion on an operation setting lever that selectively sets the tape recorder between an operating state and a non-operating state and has a self-returning force in the direction of setting the non-operating state at all times. A rotary lever is disposed near the tape conveyance path of the tape recorder, a roller that contacts the magnetic tape is pivotally supported at one end of the rotary lever, and the locking lever is provided at the other end of the rotary lever. a locking surface that engages with the operating projection to maintain the operation setting lever in the operating state of the tape recorder, and acts on the rotating lever so that the roller comes into contact with the magnetic tape. A spring means is provided that biases the roller to rotate in the direction and acts on the roller with an acting force weaker than the tension at the end of winding of the magnetic tape, and acts on the rotary lever to cause the roller to rotate. The spring means is biased to rotate in a direction away from the magnetic tape, and when the operation setting lever is in the operating state, no acting force acts on the rotating lever, and the acting force is greater than the acting force of the spring means. An automatic stop device for a tape recorder comprising a spring means. (2) The other spring means is provided so as to be engageable with the rotating lever and the operation setting lever, and the forward movement of the operation setting lever causes the first spring means to move the roller forward in the tape direction. An automatic stop device for a tape recorder as set forth in claim 1 of the utility model registration claim, characterized in that: (3) The operation setting lever is provided with an engaging portion that engages with one side of the rotation lever, and the other spring means is also used as a return biasing spring for the operation setting lever. An automatic stop device for a tape recorder according to claim 1 of the utility model registration claim.