JPH0416260Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape wrapping prevention device in a tape player.

[Technical background of the invention and its problems] The running of the tape in a tape player is carried out by sandwiching and feeding the tape between a capstan shaft rotating at a constant speed and a pinch roller. If the tape gets wet, it may wrap around the capstan shaft or pinch roller.
This has the disadvantage of causing damage to the tape and the tape player.

Therefore, tape players have conventionally been provided with tape wrapping prevention devices to prevent such inconveniences from occurring.

For example, in the case of an auto-reverse type tape player in which the running direction of the tape is automatically reversed at the tape end, means for detecting rotation or non-rotation of the reel bases are provided on both reel bases.
When the rotation of the reel base on the take-up side stops due to tape slack or protrusion from the cassette, the running direction of the tape is immediately reversed to absorb the slack or protrusion.

However, in reality, since the reversal of the tape is started after detecting the stoppage of rotation of the reel base, winding has often already started when the stoppage of rotation is detected.

In that case, the conventional device only determines whether the reel base is rotating or stopping, so winding starts, and the tape pulled out by the capstan shaft is used to connect the winding side and the unwinding side. Even when both reel bases are rotating toward the feeding side, the rotation of both reel bases is detected, the tape player determines that it is in a normal state, and continues to run the tape, so it is effective as a preventive measure to prevent wrapping. There was a problem that made it unable to perform its functions.

[Purpose of the invention] The purpose of the invention is to solve the problems of the conventional technology as described above, and to prevent the reel bases on both the winding side and the sending side from rotating in opposite directions when the tape starts to be wound. In such cases, a tape wrapping prevention device is provided that can avoid fatal problems such as tape breakage or damage to the tape player by stopping the rotation of both reel bases or reversing the running direction. It is about providing.

[Summary of the invention] The tape wrapping prevention device of the present invention has the same pattern alternately formed on the surface of each reel base synchronous rotating body along the circumferential direction, and whose width in the circumferential direction is A plurality of conducting parts and non-conducting parts that increase or decrease, and a plurality of conducting parts and non-conducting parts that are provided on each of these rotating bodies and whose pulse widths sequentially increase or decrease by detecting the conducting parts and non-conducting parts of each rotating body. and an input waveform recognition circuit that is connected to the terminal of each rotating body and that compares and recognizes the increasing or decreasing tendency of the width of the plurality of pulse signals input from both terminals. The input waveform recognition circuit stops the rotation of the reel base or reverses the running direction when the width increases or decreases of the plurality of pulse signals input from each rotating body do not match.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be specifically described with reference to the drawings.

In FIG. 1, 1a and 1b are reel base synchronous rotating bodies, each of which is formed to rotate integrally with the reel base or in conjunction with the reel base. On the outer periphery of each of these rotating bodies 1a, 1b,
A conductive portion 2 and a non-conductive portion 3 each having the same pattern are provided. In this embodiment, the conductive portion 2 and the non-conductive portion 3 are a metal layer and an insulating layer formed on the surface of the rotating body along its circumferential direction, as shown in the enlarged view of FIG. The conductive portion 2 is formed in a comb-like shape as a whole, and the width of each comb-teeth increases (or decreases) sequentially. Each rotating body 1a,
Terminal portions 5a, 6a, 5b, and 6b are provided on 1b. This terminal portion is formed of a metal wire and is always in contact with the circumferential surface of each rotating body.
One terminal part 5a, 5b is always in contact with the conductive part 3, and the other terminal part 6a, 6b is in contact with the comb-teeth part of the conductive part, so that it is not electrically connected to the conductive part 2 as the rotating body rotates. The parts 3 and 3 are alternately contacted. These terminals detect conductive parts and non-conductive parts provided on each of the rotating bodies, and generate a plurality of pulse signals whose pulse widths sequentially increase or decrease according to changes in the width of the conductive parts. This is what is output.

Each of the terminal sections is connected to an input waveform recognition circuit 7. This input waveform recognition circuit 7 recognizes the tendency of increase or decrease in the pulse width of the pulse signal input from the terminal portion of each rotating body.

This input waveform recognition circuit 7 includes a detection section 8 that detects the running direction of the tape, and a detection section 9 that detects each mode of play and fast forward/rewind of the tape player.
are connected. Among these, the tape running direction detection section 8 detects the running direction of the tape, and causes the input waveform recognition circuit 7 to recognize the winding side signal as a reference signal among the two types of signals from each rotating body inputted to the input waveform recognition circuit 7. It is for. In addition, the mode detection section 9
detects each mode of the tape player, and when the tape player is in fast forward/reverse mode, the input waveform recognition circuit 7 does not compare the input waveforms from each rotary body, but simply detects the presence or absence of an input signal. It is something that makes you aware.

The input waveform recognition circuit 7 performs control for stopping, reversing, or stopping the rotation of the reel base when the increasing or decreasing trends of the widths of the plurality of pulse signals input from each rotating body do not match in the input waveform recognition circuit. It is connected to the mechanism 10.

The tape wrapping prevention device of this embodiment has the above-mentioned structure, and its operation is as follows.

When the tape is running normally during a play operation, each reel base is rotating in the same direction, so each rotating body 1a, 1b also rotates in the same direction. Therefore, each terminal portion in contact with each rotating body 1a, 1b also sequentially contacts the same pattern of conductive portions 2 in the same rotational direction, and thus picks up signals of the same pattern. For example, when the rotating body is rotating in the forward direction, a signal whose pulse width increases sequentially as shown in FIG.
A signal in which the pulse width gradually decreases as shown in FIG. 3B is obtained. This signal is sent to the input signal recognition circuit 7 connected to each terminal section and compared there, but when the tape is running normally, the tendency of change in the pulse width of both signals is basically Since they are equal, the play state continues.

Next, when winding of the tape occurs, each reel base and its synchronous rotating body rotate in the opposite direction with the tape being pulled out by a capstan shaft, etc., and each rotating body is input to the input waveform recognition circuit 7. Since the direction of change in the pulse width of the signal waveform from is reversed,
When this is detected, the control mechanism 10 reverses the running direction of the tape or stops the tape. Therefore, rotation of the reel base during winding, which could not be detected in the past, can be clearly distinguished from normal rotation, and serious accidents can be avoided by immediately reversing or stopping the tape.

When reversing the running direction, if the winding is not resolved, the opposite signal will be input to the input waveform recognition circuit 7 again, and the tape will be reversed again. It is preferable to stop the tape player when the reversing operation continues for a certain number of times or more within a certain period of time.

Furthermore, in the illustrated embodiment, the input waveform recognition circuit 7
A tape running direction detecting section 8 was installed in the tape running direction detection section 8, and the waveforms of the signals of each rotating body were always compared using the input signal on the winding side as a reference. However, the present invention can be carried out even if the winding side is not used as a reference. be. Furthermore, the mode detection section 9 is configured to only reverse the running direction at the end of the tape without comparing the input signals from each rotary body during fast forwarding and rewinding, which is also an essential condition of the present invention. isn't it.

Furthermore, in the illustrated embodiment, a conductive part made of a metal layer and a terminal part in contact with the conductive part are used to obtain the same pattern of waveform signals from each rotating body. It is also possible to use a reed switch, a Hall element, or an optical signal detection means.

[Effects of the invention] As described above, according to the tape winding prevention device of the present invention, it is possible to determine whether the tape is running normally or abnormally by comparing the rotational direction of each reel base. When the reel base rotates abnormally due to attachment, the tape can be reversed or stopped immediately, which has the effect of avoiding serious accidents such as damage to the tape or equipment.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the tape wrapping prevention device of the present invention, Fig. 2 is a perspective view showing an example of a reel base synchronous rotating body of the present invention, and Fig. 3 is an output from each rotating body. FIG. 3 is a waveform diagram showing waveforms. 1a, 1b... Reel base synchronous rotating body, 2...
...Conducting part, 3... Non-conducting part, 5a, 5b, 6a,
6b...Terminal section, 7...Input waveform recognition circuit, 8...
...Tape running direction detection section, 9...Mode detection section,
10... Tape player control mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) Two reel-based synchronous rotating bodies; the same pattern alternately formed on the surface of each of these rotating bodies along the circumferential direction;
and a plurality of conducting parts and non-conducting parts whose widths in the circumferential direction increase or decrease sequentially, and each of these rotating bodies is provided with a plurality of conducting parts and non-conducting parts, and the conducting parts and non-conducting parts of each rotating body are detected, Compare the terminal section that outputs multiple pulse signals whose pulse width increases or decreases sequentially with the increasing or decreasing tendency of the width of the multiple pulse signals connected to the terminal section of each rotating body and input from both terminal sections. The reel base A tape wrapping prevention device comprising: a reel base control mechanism for stopping or reversing the rotation of the tape winding prevention device. (2) The tape wrapping prevention device according to claim 1, wherein the conductive portion provided on each rotating body is a metal layer provided in a comb-teeth shape on the outer periphery of the rotating body. (3) The tape wrapping prevention device according to claim 1, wherein the conductive portion provided on each rotating body is a magnet embedded in the outer periphery of the rotating body, and the terminal portion is a reed switch or a Hall element. . (4) The tape wrapping prevention device according to claim 1, wherein the conductive portion and the terminal portion provided on the outer periphery of the rotating body generate an output waveform by optical means.