JPH0150981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, and particularly to one in which malfunction of an automatic stop mechanism is prevented.

Conventionally, tape recorders have been used that detect the end of a recording tape and automatically stop it. This conventional tape recorder focuses on the fact that the tensile force applied to the recording tape increases at the end of its winding, and detects this tensile force and operates an automatic stop mechanism to stop the recording tape from running. It was hot.

However, the conventional tape recorder has a problem in that the automatic stop mechanism malfunctions. In other words, when switching the operation of the tape recorder from the unwinding operation in which the recording tape is rewound at high speed to the feed reel to the playback operation in which the recording tape is suddenly run to the take-up reel, the recording tape loses its inertia to the feed reel. The recording tape is caused to travel to the take-up reel against the force, and the tensile force acting on the recording tape increases instantaneously. At this time, the automatic stop mechanism operates in the same manner as at the end of winding the recording tape, resulting in a malfunction.

Therefore, in conventional tape recorders, the unwinding speed of the unwinding operation is maintained below a certain limit to prevent the above-mentioned malfunction.

The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to enable the automatic stop mechanism to operate even if the tensile force applied to the recording tape increases other than at the end of winding the recording tape. The object of the present invention is to provide a tape recorder that can prevent malfunctions of an automatic stop mechanism without causing any problems.

The present invention achieves the above object with the following configuration. That is, a detecting body is attached to the board of the tape recorder so that the detecting body moves when it detects the tension of the recording tape, and an automatic stop mechanism is operated by the movement of the detecting body, so that the detecting body is constantly connected to the detecting body. A pressed body having a pressure-receiving surface that receives the pressing force from the detection body is provided between the rotating take-up side reel stand, and this pressed body can move forward and backward in the pressing direction of the detection body and in the rotation direction. The object to be pressed is elastically held in a non-operating position by a spring, and the pressure receiving surface is formed to have a predetermined length in the rotating direction of the object to be pressed, and the object to be pressed by the detection object is formed to have a predetermined length. The automatic stop mechanism operates only when the pressed body contacts and rotates the take-up reel stand, the pressure receiving surface moves out of the pressing range of the detection body, and the amount of movement of the detection body increases. .

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a plan view of a mechanical part of a tape recorder, and 2 in the figure is a board. This board 2 includes a feed side reel shaft 4, a take-up side reel shaft 6, various operation levers 8..., and a head board 1.
0 etc. is provided. Both reel shafts 4 and 6 are configured to be rotationally driven by a drive motor (not shown) via reel stands 12 and 14, respectively. As shown in FIG. 2, a friction plate 16 is interposed between the take-up reel shaft 6 and the take-up reel stand 14, and the rotational force of the drive motor is transferred to the take-up reel by frictional conduction. This is transmitted to the shaft 6 so that the take-up reel stand 14 constantly rotates. The head board 10 has an operating lever 8...
It is attached so that it can move forward and backward with respect to the board 2. A recording/reproducing head 18, an erasing head 20, etc. are mounted on the head substrate 10, and a detecting body 22 is pivotally supported at an intermediate portion thereof so as to be movable forward and backward. A contactor 24 is fixed to one end of the detection body 22 for contacting the recording tape and detecting the tensile force acting on the recording tape. Then, the detection object 22
A pressing portion 26 and a transmitting portion 28 are integrally formed on the other end side, and the transmitting portion 28 is configured to transmit the rotation of the detection body 22 to the automatic stop mechanism 30. The automatic stop mechanism 30 is configured to operate when the amount of rotation of the detection body 22 exceeds a predetermined amount to return each operating lever 8 to the stop position.

A pressed body 32 is provided between the pressing portion 26 and the take-up reel stand 14. The pressed body 32 has a movement distance that allows the pressed body 32 to move forward and the tip 34 to come into contact with the take-up reel base 14 when pressed by the pressing portion 26 in the direction of the take-up reel base 14. A long hole 36 is bored therein, and the pressed body 32 is rotatably supported by the long hole 36 . Then, the pressing portion 2 of the pressed body 32
A pressure receiving surface 38 that receives the pressing force from the pressing portion 26 is formed on the 6 side, and this pressure receiving surface 38 has a predetermined length in the rotating direction of the pressed body 32. A notch 40 is formed at one end of the pressure receiving surface 38 . Further, the pressed body 32 is urged by a spring 44 wound around a shaft 42 in a direction away from the take-up reel stand 14, and is also urged to rotate in the direction of arrow A. In addition, 46 is a stopper, and is comprised so that the rotation by the spring 44 of the to-be-pressed body 32 may be restricted.

A cylindrical body 48 is interposed between the pressing portion 26 and the pressure receiving surface 38, and this cylindrical body 48
is attached to one end of the arm 50. The arm 50 is rotatably supported by the base plate 2.
A tension spring 52 is attached to the other end of the spring 0. In the figure, 54 is a stopper, and the arm 50
It is configured to restrict the rotation range of the.

The take-up reel stand 14 is rotationally driven in the direction of arrow B during the reproducing operation.

The operation of such a structure will be explained. Third
The figure shows a reproduction operation in which the recording tape 56 is traveling toward the take-up reel. At this time, since the tensile force applied to the recording tape 56 is small, the recording tape 56 is largely bent by the contactor 24 and runs without rotating the detection body 22. Therefore, the pressed body 32 and arm 50 are held in a non-operating state by springs 44 and 52, respectively.

Next, when the recording tape 56 is wound onto the take-up reel and reaches the end, the tensile force applied to the recording tape 56 increases as shown in FIG. Then, the state shown by the one-dot chain line is reached, and the contactor 24 is pressed downward.
When the contactor 24 is pressed downward, the entire detection body 22 rotates, and the pressing portion 26 presses the cylindrical body 48, causing the arm 50 to rotate against the force of the spring 52. The cylindrical body 48 is the pressure receiving surface 3 of the pressed body 32.
8 and presses the pressed body 32 in the direction of the winding-side ream table 14. At this time, the pressed body 32 moves forward in the direction of the take-up reel stand 14 against the spring 44, and brings the tip end 34 into contact with the circumferential surface of the take-up reel stand 14.

When the state shown in FIG. 4 is maintained for a predetermined period of time, the pressed body 32 is rotated in the direction of arrow C by the rotation of the take-up reel stand 14, and the cylindrical body 48 is rotated as shown in FIG. The terminal end of the pressure receiving surface 38 is reached. Note that in this state, the automatic stop mechanism 3
0 does not work.

Then, the pressed body 32 continues to rotate, and finally the cylindrical body 48 enters into the notch 40 as shown in FIG. At this time, the detection body 22 rotates greatly, and the rotation of the detection body 22 is transmitted to the automatic stop mechanism 30 as described above, and the automatic stop mechanism 30 operates.
The operating lever 8 is returned to its original position.

When the tape recorder automatically stops in this way, the tensile force applied to the recording tape 56 disappears,
The pressing force applied to the contactor 24 also disappears.
At this time, the detection body 22 is rotated by the tensile force of the spring 52 of the arm 50 and returns to the original state shown in FIG. 3. The pressed body 32 is also returned to the non-operating position by the spring 44.

The above-mentioned device has the following advantages.

In the automatic stop mechanism 30, the state shown in FIG.
It only works when it reaches 0. Therefore,
The automatic stop mechanism 30 does not operate due to the instantaneous increase in tensile force that occurs when switching from the unwinding operation to the reproducing operation, and malfunctions as in the prior art can be reliably prevented.

Furthermore, after the automatic stop, the detection object 22 is moved to the arm 50.
Since the spring 52 returns to the non-operating state, other operations such as unwinding can be performed quickly.

Next, other embodiments will be described with reference to FIGS. 7 to 10. Components in the figure that are the same as those in the embodiment shown in FIG. 1 will be described with the same reference numerals. In this embodiment, as shown in FIG. 7, the pressure receiving surface 62 of the pressed body 60 and the contact surface 64 that contacts the take-up reel stand 14 are formed in the shape of an arc having the same center. Further, the pressing portion 66 of the detection body 22 is formed with a stepped portion 68, as shown in FIG.

Such a device has the following advantages in addition to producing the same effects as the one embodiment described above.

FIG. 9 shows a state in which the pressed body 60 is pressed by the detection body 22 and the contact surface 64 is brought into contact with the take-up reel stand 14. At this time, the pressure receiving surface 62
Since the contact surface 64 is formed in an arc shape centered on the central axis of the shaft 42, the pressed body 60 can rotate more smoothly.

Since a stepped portion 68 is formed on the pressing portion 66, when the cylindrical body 48 comes off the pressure receiving surface 62 as shown in FIG.
8. Therefore, the detection body 22 and the cylindrical body 48 are engaged after the automatic stop, and the detection body 22 can be more reliably returned to the non-operating state.

Note that the tape recorder according to the present invention is not limited to the above two embodiments. For example, it is not necessary to provide the cylindrical body 48 and the arm 50; in short, it is sufficient that the object to be pressed can be pressed by the sensing object. You can also press the body.

As explained above, according to the present invention, the amount of movement of the detection object increases only when the tensile force applied to the recording tape increases over a predetermined period of time, and the amount of movement of the detection object increases only when the amount of movement of the detection object increases. The effects are great, such as being able to provide a tape recorder that can prevent malfunctions of the automatic stop mechanism by activating the automatic stop mechanism.

[Brief explanation of drawings]

Figures 1 to 6 are diagrams showing an embodiment of the present invention, in which Figure 1 is a plan view, Figures 2 to 6 are configuration diagrams showing the operation, and Figures 7 to 10 are diagrams showing the invention. FIG. 7 is a plan view, and FIG.
10 through 10 are configuration diagrams showing the operation. 2... Substrate, 10... Head substrate, 22... Sensing object, 32, 60... Pressed object, 38, 62...
Pressure receiving surface, 36...long hole, 48...cylindrical body, 50...
...Arm, 44, 52...Spring, 14...
Winding side reel stand, 56... Recording tape.

Claims (1)

[Scope of Claims] 1. A detection body that is attached to the board of the tape recorder and moves by detecting the tension of the recording tape; an automatic stop mechanism that is operated by the movement of the detection body to stop the running of the recording tape; a pressed body having a pressure-receiving surface that is pressed toward a take-up reel stand that is constantly rotating by a detection body, is pivotably supported to move back and forth in the pressing direction, and is rotatably supported, and receives a pressing force from the detection body; a spring that elastically holds the pressed body in a non-operating position, the pressure receiving surface is formed to have a predetermined length in the rotating direction of the pressed body, and the pressed body is pressed by the detection body and The automatic stop mechanism is operated only when the reel contacts the take-up reel stand and rotates against the spring, the pressure receiving surface moves out of the pressing range of the detection body, and the amount of movement of the detection body increases. A tape recorder featuring: 2. According to claim 1, the detecting body is rotatably supported at an intermediate portion, one end contacts the recording tape, and the other end presses the pressed body. tape recorder.