JP2545931Y2 - Cassette type tape tension gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention is a cassette type tape tensioner which is mounted on a cassette type tape recorder or video tape recorder and measures a tape driving force by a capstan of a tape driving mechanism and a pinch roller. About gauges.

[Conventional technology]

Conventionally, as a torque measuring device for tape recorders and video tape recorders, a rotating gauge with an inner and outer ring with a scale indicating the relative displacement in the cassette body instead of a reel of the tape cassette, and a spiral spring connecting the two wheels is built in A device is known in which a tape is wound around an outer ring of a rotating gauge, and a tape tension during tape running and a rotating torque of a reel shaft are read based on a relative displacement between the two wheels.

[Problems to be solved by the invention]

With the above device, the relative tension between the inner and outer wheels can be accurately read by the instruction of the pointer on the scale, but the tape tension value or torque value can be accurately read.However, in the assembly line of the cassette deck, the capstan of the tape drive mechanism and the pinch roller are used. In order to determine whether the tape driving force is appropriate or not, it is not always necessary to use an accurate numerical value. Rather, reading a numerical value using a graduation has variations in reading by a measurer and has the disadvantage that measurement is troublesome.

Further, there is a problem that the scale of the gauge in the loaded cassette half cannot be directly read in a deck of a type in which an upper surface and a front surface are not opened. Further practical issues include:
It is often sufficient to determine whether the value of the driving force or the tape tension of each tape deck has reached a predetermined reference value.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cassette type tape tension gauge which can quickly determine whether a driving force of a tape or a tape tension is good.

[Means for solving the problem]

In order to achieve the above object, a cassette type tape tension gauge according to the present invention is a cassette type tape tension gauge having a rotating gauge, a take-up reel, a mark, and an electric circuit in a cassette body. The main body is to be loaded on the tape deck, and the reels on the sending side and the winding side are accommodated between the pair of halves. The rotating gauge is used for the reel on the sending side and consists of a combination of inner and outer rings. , The outer ring is arranged concentrically, the two rings are connected by a spiral spring, the inner ring is fixed to the cassette body, the outer ring is for winding tape, and the take-up reel is pulled out from the outer ring. The tape is wound around the tape that is sent out in response to the tape tension. The mark is a specific piece on the outer peripheral surface of the outer ring that indicates a preset tape tension value. The electric circuit detects a sign, converts it into an electric signal, amplifies the sign, and displays the detected signal. The electric circuit includes an optical sensor and a display. The optical sensor is installed toward the outer peripheral surface of the outer ring corresponding to the position where the tape tension value indicates 0, optically detects the sign, and converts the detection signal into an electric signal, The display displays the detection signal by lighting or sounding. The electric circuit excluding the display is installed in a space in the cassette body formed around the take-up reel.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a rotating gauge 3 is used for one of a pair of tape reels installed in a cassette body 1 composed of a pair of halves. One end of the tape 4 is fixed to the rotating gauge 3 used for the sending-side reel, and the other end is fixed on the periphery of the take-up reel 2. The tape 4 extending between the two reels has a window hole 5 opened in the front of the cassette body 1.
It is arranged along. In FIG. 2, the rotating gauge 3 comprises a combination of an inner ring 7 fixed to the cassette body 1 by engaging with a reel shaft hole 6 of the cassette body 1 and an outer ring 8 for winding the tape 4. , 8 are arranged concentrically, the two wheels are connected by a spiral spring 9, and as shown in FIG.
Is provided with an index 10a and the outer ring 8 is provided with a scale 10b.

In FIG. 1, an optically readable marker 11 is attached to a part of the outer peripheral surface of the outer ring 8 in correspondence with a specific scale 10b indicating a preset tape tension value. The reflective optical sensor 12 for reading the marker 11 is set in accordance with the position of the O scale indicated by the arrow.
When a reflective metal material is used for the outer ring 8 of the rotating gauge 3, a non-reflective label is attached to the sign 11. Conversely, when the outer ring 8 is non-reflective, a reflective label is attached to the sign 11. Is sufficient. Of course, the sign is not limited to this, and the sign can also be formed by applying paint, black vinyl tape, polishing mirror surface processing, or the like.

FIG. 3 shows an electric circuit including the optical sensor 12. The electric circuit is an amplifier circuit composed of a power supply battery 13, a transistor 14, and resistors 15 and 16, and the circuit further includes a power switch.
17 and a pilot lamp 18 are connected. Therefore, the signal obtained by the optical sensor 12 is amplified by the transistor 14 and turns on the pilot lamp 18.

The electric circuit excluding the pilot lamp 18 is mounted on a substrate and installed in the space inside the cassette body 1 formed around the take-up reel 2. The pilot lamp 18 is designed in the form of a cassette deck to use this gauge. Set the mounting position accordingly. In the case of a cassette deck having an open front or upper surface, a pilot lamp may be installed so as to face the upper surface of the cassette body 1. However, in the case of a cassette deck having no open front or upper surface, the cassette insertion is performed. A pilot lamp 18 is installed so as to face the opening side of the mouth, in this embodiment, one side surface of the cassette body 1. The operator of the switch 17 can be provided at any position that can be operated from outside the cassette body 1. When the push-button switch is used, if it is mounted at a position where it can be operated by the pressure from the inner wall surface when it is loaded on the cassette deck, there is no need to manually operate it.

The cassette type tape tension gauge of the present invention is mounted on a tape deck in the same manner as a normal tape cassette, and measures the tape tension generated on the tape by receiving a tape driving force in a recording or reproducing state when the power is turned on.

That is, in the recording and reproducing states, the inner and outer wheels 7, 8 are relatively rotated and displaced to balance the rotational torque with the tape tension, and the tape tension value at that time is displayed on the scale 10b designated by the index 10a. When the upper surface of the cassette main body can be directly viewed, the instruction can be directly viewed. In this case,
When the tape driving force exceeds the specified tape tension value, the marker 11 passes in front of the optical sensor 12 and
11 is detected by the optical sensor 12, and the pilot lamp 18 is turned on by the sensor output. The lighting of the lamp 18 is observed through an opening which is a cassette insertion port of the cassette deck, so that the quality of the tape driving force on the inspection line of the cassette deck can be determined at a glance. In the embodiment, an example in which the display is performed by turning on the lamp has been described. Alternatively, a sound generation mechanism such as a buzzer may be used.

[Effect of the invention]

As described above, according to the present invention, whether or not the tape tension due to the tape driving force inherent to the tape deck has exceeded a specified value is indicated by lighting of a lamp or a buzzer sound, so that the quality can be immediately judged visually or by hearing. In particular, when a lamp is used for display, it is lit and displayed using the opening of the cassette slot formed according to the type of cassette deck, so it is possible to judge pass / fail by simply observing whether the lamp is lit from the front work position Has the effect of improving the work efficiency.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention excluding an upper half, FIG. 2 is an enlarged sectional view of a rotary gauge, and FIG. 3 is an electronic circuit diagram. 1 cassette body 2 winding reel 3 rotating gauge 4 tape 7 inner ring 8 outer ring 9 spiral spring 10a index 10b scale 11 Sign 12 Optical sensor 13 Power battery 14 Transistor 15, 16 Resistor 17 Power switch 18 Pilot lamp

Claims (1)

(57) [Scope of request for utility model registration] A rotating gauge, a take-up reel, a sign,
A cassette-type tape tension gauge having an electric circuit and a cassette body, wherein the cassette body is mounted on a tape deck, and reels on a sending side and a winding side are housed between a pair of halves; The gauge is used for the reel on the sending side, and is composed of a combination of an inner ring and an outer ring. The inner ring and the outer ring are arranged concentrically, the two rings are connected by a spiral spring, and the inner ring is fixed to the cassette body.
The outer ring is for winding the tape, the take-up reel is for winding the tape pulled out from the outer ring, and receiving the tape tension and sent out, and the mark is for the outer ring which indicates a preset tape tension value. It is attached to a specific location on the outer peripheral surface and is optically readable.The electric circuit detects the sign, converts it to an electric signal, amplifies it, and further displays the detection signal. An optical sensor is installed toward the outer peripheral surface of the outer ring corresponding to the position where the tape tension value indicates 0, optically detects the sign, and converts the detection signal into an electric signal. The indicator displays the detection signal by lighting or sounding. The electric circuit excluding the indicator is installed in the space inside the cassette body formed around the take-up reel. Cassette-type tape tension gauge, characterized in that.