JP3058354B2 - Tape pulling force measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial application Conventional technology (FIGS. 3 and 4) Problems to be solved by the invention (FIGS. 3 and 4) Means for solving the problems (FIGS. 1 and 2) Action (FIGS. 1 and 2) Example (FIGS. 1 and 2) Effect of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a tape pulling force, and is suitably applied to, for example, an apparatus for measuring a tape pulling force of an audio tape recorder.

[0003]

2. Description of the Related Art Conventionally, in an audio tape recorder, a magnetic tape accommodated in a supply reel in a cassette case is pulled out according to the rotation of a capstan and a pinch roller, and is led out while running at a constant speed. The shaft is wound on a rotating take-up reel.

Therefore, in a tape recorder, the capstan and the pinch roller need to pull the magnetic tape with a predetermined tensile force.
2. Description of the Related Art A cassette-type tape pulling force measuring device as disclosed in Japanese Patent Application Laid-Open No. 59-14924 is used as an operation check in a tape recorder manufacturing process and as an investigation of a cause of failure at the time of service.

That is, as shown in FIG. 3, such a cassette-type tape tension measuring device 1 has a cassette case 2 having the same shape as the tape cassette and composed of a pair of upper and lower synthetic resin halves. The upper and lower halves are connected to each other by five screws 3.

In the cassette case 2, instead of a supply cassette and a take-up reel for the tape cassette, a reel 4 for measuring a tape pulling force is disposed on the supply reel shaft side, and a dummy reel 5 is disposed on the take-up reel shaft side. ing.

The tape pulling force measuring device 1 is loaded in a tape recorder in the same manner as a normal tape cassette, and a magnetic tape wound on a tape pulling force measuring reel 4 is pulled by a capstan and a pinch roller. The tensile force at this time is displayed as a pointer 7 on the scale 6 of the window formed in the cassette case 2.

As shown in FIG. 4, the reel 4 for measuring the tape pulling force of the tape pulling force measuring device 1 has a cassette case 2 formed by a pair of pins 8 and a pair of small holes 9.
And an outer ring 12 rotatably supported by the inner ring 10 by a ball bearing 11.
It is composed of

A spiral spring is interposed between the inner ring 10 and the outer ring 12 with the inner end and the outer end fixed to the inner ring 10 and the outer ring 12, respectively. Is biased in a clockwise direction.

A reel shaft insertion hole 13 is formed at the center of the inner ring 10 so as to penetrate therethrough. A plurality of projections 15 formed on the inner peripheral surface side of the reel shaft insertion hole 13 form
The tape tension measuring reel 4 is engaged with a supply reel shaft 16 of a tape recorder (not shown).

On the other hand, the dummy reel 5 includes the inner race 17 and the outer race 1.
8, a bar spring 19 that is bent into a substantially rectangular shape is interposed between the inner ring 17 and the outer ring 18. Both ends of the bar spring 19 are engaged in small holes 20 formed in the outer ring 18, and the quadrangular apex of the bar spring 19 is received in a groove 21 formed on the inner peripheral surface of the outer ring 18. , Each side of the square is received in a groove 22 formed on the outer peripheral surface of the inner ring 17, and the inner ring 17 and the outer ring 18 are received.
Are rotatably supported by the cassette case 2.

The inner ring 17 has a reel shaft insertion hole 23 formed at the center thereof so as to pass therethrough. The plurality of protrusions 24 formed on the inner peripheral surface side of the reel shaft insertion hole 23 allow
The dummy reel 5 is engaged with the take-up reel shaft 25 of the tape recorder.

Further, both ends of the tape 26 are the outer race 12 of the tape tension measuring reel 4 and the outer race 1 of the dummy reel 5.
8 and wound around the respective reels 4 and 5, and further housed in the cassette case 2 guided by the tape guide rollers 27 and 28 and the tape guide pins 29.

With such a configuration, if the tape pulling force measuring device 1 is loaded into a tape recorder in the same manner as a normal tape cassette, a through hole 3 formed in the cassette case 2 is formed.
The capstan 31 is inserted through the back side of the tape 26 through 0, and the pinch roller 32 is pressed from the front side of the tape 26.

The capstan 31 rotates at a constant speed, and the pulling force acts on the tape 26. Actually, this pulling force is a force for rotating the outer ring 12 of the tape pulling force measuring reel 4 counterclockwise.

Accordingly, the outer ring 12 rotates counterclockwise with respect to the inner ring 10 while elastically deforming the spiral spring, and the tension force acting on the tape 26 and the elastic restoring force of the spiral spring are balanced. Then, the rotation of the outer ring 12 is stopped, and the tape pulling force can be measured from the value on the scale 6 indicated by the pointer 7 at this time.

[0017]

By the way, in the conventional tape recorder, the rotation state of the supply reel shaft is monitored,
When it is detected that the rotation of the supply reel has stopped, the end of the tape is determined, and the so-called auto-shutter-off operation for releasing the playback operation or the recording operation, and the auto-reverse operation for reversing the running direction of the tape are performed. Some have been made to do so.

However, for the tape recorder having the auto-shutter-off function and the auto-reverse function, when the tape pulling force is measured using the tape pulling force measuring device 1 described above, the inner ring of the tape pulling force measuring reel 4 is required. The supply reel shaft 16 is always stopped because 10 is locked to the cassette case 2.

Therefore, before the rotation of the outer ring 12 is stopped by the balance between the tensile force acting on the tape 26 and the elastic restoring force of the spiral spring, the above-mentioned auto-shutter-off operation and auto-reverse operation are continuously repeated. As a result, there is a problem that the tape pulling force measuring device 1 cannot measure the tape pulling force.

The present invention has been made in view of the above points, and is a tape tension measuring apparatus capable of reliably measuring a tape tension even with a tape recorder having a simple configuration and an auto-shutter-off function or an auto-reverse function. It is intended to propose.

[0021]

According to the present invention, in order to solve the above-mentioned problem, the tape 26 pulled by the capstan 31 is drawn out of the supply reel in the cassette case 2 and wound on the take-up reel. In the tape pulling force measuring device 40 for measuring the force, the cassette case 2
The first inner ring 43 and the first outer ring 12 are rotatably supported on a middle wheel 42 locked on the inner supply reel shaft 16 side, and the supply reel shaft is interlocked with the first inner wheel 43. 16 is rotated, a spring 50 is interposed between the middle wheel 42 and the first outer wheel 12, and the tensile force of the tape 26, one end of which is fixed to the first outer wheel 12, is applied to the first by the deformation of the spring 50. A measuring reel means 41 for measuring the amount of rotation of the outer ring 12 with respect to the middle wheel 42, and a second inner ring 17 rotatably disposed on the take-up reel shaft 25 side in the cassette case 2; The second outer ring 18 is rotatably supported by the second inner ring 17 while being rotated in conjunction with the second inner ring 17.
The winding reel means 47 for rotating the second inner ring 17 of the winding reel means 47 by rotating the second inner ring 17 of the winding reel means 47 by the first reel of the measuring reel means 41. And the rotation transmitting means 48 and 49 for transmitting to the inner ring 43.

[0022]

The measuring reel means 41 comprises a middle wheel 42 locked in the cassette case 2, and a first inner wheel 43 and a first outer wheel 12 rotatably supported by the middle wheel 42. The rotation of the second inner race 17 of the take-up reel means 47 is transmitted to the first inner race 43 by the rotation transmitting means 48, 49, so that the supply reel is interlocked with the rotation of the take-up reel shaft 25. The shaft 16 rotates and thus the supply reel shaft 16
The tape pulling force can also be effectively measured for a tape device that performs an automatic stop operation and / or a tape reversal operation by detecting the rotation stop of the tape.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 in which parts corresponding to those in FIG.
In the figure, reference numeral 40 designates a tape pulling force measuring device according to the present invention as a whole, and a tape pulling force measuring reel 41 is fixed to a cassette case 2 by a pair of pins 8 and a pair of small holes 9. And an outer ring 1 rotatably supported by a ball bearing 11 with respect to a middle wheel 42.
2 and an inner ring 43 rotatably disposed inside the middle wheel 42 with a predetermined gap.

In the center of the inner ring 43, a reel shaft insertion hole 4 is provided.
5 are formed through the reel shaft insertion hole 45.
The plurality of protrusions 46 formed on the inner peripheral side of the tape reel engage the tape tension measuring reel 42 with the supply reel shaft 16 of a tape recorder (not shown).

The inner ring 43 of the tape pulling force measuring reel 42 is selected to be slightly higher than the outer ring 12 and the middle ring 42 as shown in the sectional view of FIG. A pulley composed of a groove having a predetermined depth is formed integrally with the circumference of a portion protruding by a predetermined amount from the groove.

Also, the inner ring 17 of the dummy reel 47 is selected to have a height slightly higher in the vicinity of the center with respect to the periphery, and a pulley 48 having a groove of a predetermined depth is formed integrally with the circumference of a portion protruding by a predetermined amount. The formed reel 42 for measuring the tape pulling force
A belt 49 is stretched between the inner ring 43 and the inner ring 43.

Thus, the inner race 17 of the dummy reel 47 is
Is rotated in conjunction with the rotation of the take-up reel shaft 25, this rotation is transmitted to the inner ring 43 of the tape pulling force measuring reel 42 by the belt 49, and as a result, the inner ring 43 is The supply reel shaft 16 rotates in the rotation direction, and the supply reel shaft 16 rotates in conjunction with the rotation.

In the above configuration, when the tape pulling force measuring device 40 is loaded into the tape recorder in the same manner as a normal tape cassette, the capstan 31 is moved to the back side of the tape 26 through the through hole 30 formed in the cassette case 2. At the same time, the pinch roller 32 is pressed from the front side of the tape 26.

The capstan 31 is rotating at a constant speed, and the pulling force acts on the tape 26. Actually, this pulling force is a force for rotating the tape pulling force measuring reel 41 counterclockwise with respect to the outer ring 12.

Accordingly, the outer ring 12 rotates counterclockwise with respect to the middle wheel 42 while elastically deforming the spiral spring 50,
The rotation of the outer ring 12 is stopped in a state where the tensile force acting on the tape 26 and the elastic restoring force of the spiral spring 50 are balanced, and the tape tensile force is measured from the value on the scale 6 indicated by the pointer 7 at this time. I can do it.

Further, such a tape pulling force measuring device 4
When using 0 to measure the tape pulling force of a tape recorder having an auto-shutter-off function or an auto-reverse function, the tape pulling force measuring device 40 may be loaded into the tape recorder in the same manner as described above.

In this state, the inner race 17 of the dummy reel 47 is
Rotates in conjunction with the take-up reel shaft 25 of the tape recorder, and in response, the inner ring 43 of the tape tension measuring reel 41 and the supply reel shaft 16 of the tape recorder rotate.

As described above, the tape tension measuring reel 4
Regardless of the operation of measuring the tape pulling force by the outer ring 12, the rotation of the inner ring 43 of the tape pulling force measuring reel 41 and the supply reel shaft 16 of the tape recorder causes the above-described auto-shutter-off operation and auto-reverse operation. Is not performed, and the tape pulling force can be measured by the tape pulling force measuring device 40.

According to the above construction, the reel 41 for measuring the tape pulling force is attached to the middle wheel 4 locked in the cassette case 2.
2 and an inner ring 43 and an outer ring 12 rotatably supported by the middle wheel 42.
7 is transmitted to the inner ring 43 of the tape pulling force measuring reel 41 through the pulley 48 and the belt 49 formed on the inner ring 17 so that the take-up reel shaft 2
5, the supply reel shaft 16 can be rotated in association with the rotation of the rotation of the supply reel shaft 5. Thus, the tape pulling force of the tape recorder that detects the stop of the rotation of the supply reel shaft 16 and executes the auto-shutter-off operation or the auto-reverse operation. Can be realized.

In the above-described embodiment, the description has been given of the case where the tape pulling force is indicated by the pointer and the scale formed on the outer ring of the tape pulling force measuring reel. In addition to the above, various other methods may be used, such as arranging light emitting means and light receiving means above and below the outer ring, and detecting and displaying the tape pulling force based on a change in the amount of light passing through the transmission hole. The same effects as in the above embodiment can be realized.

In the above embodiment, the inner ring of the tape tension measuring reel and the inner ring of the dummy reel are connected by a belt, and the supply reel shaft is rotated in conjunction with the rotation of the take-up reel shaft. The transmitting means is not limited to this, and the same effect as in the above-described embodiment can be realized by using various transmitting means such as a combination of a gear and a chain.

Further, in the above-described embodiment, the case where the tape pulling force of the audio tape recorder is measured has been described. However, the present invention is not limited to this, and a video tape recorder (VTR), a digital audio tape recorder (DAT), or the like is used. It is widely applied and suitable for measuring the tape pulling force of various tape-shaped recording medium recording / reproducing devices.

[0039]

As described above, according to the present invention, the middle wheel having the measuring reel means locked in the cassette case, the first inner wheel and the first inner wheel rotatably supported by the middle wheel. 1
The rotation of the second inner ring of the take-up reel means is transmitted to the first inner ring by the rotation transmission means, so that the supply reel shaft is interlocked with the rotation of the take-up reel shaft. A tape pulling force measuring device capable of measuring a tape pulling force can also be realized for a tape device that rotates and thus performs an automatic stop operation and / or a tape reversing operation by detecting the rotation stop of the supply reel shaft.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an internal configuration of an embodiment of a tape pulling force measuring device according to the present invention.

FIG. 2 is a sectional view showing the tape tensile force measuring device of FIG. 1 taken along the line II-II.

FIG. 3 is a schematic diagram illustrating an appearance of a tape pulling force measuring device.

FIG. 4 is a schematic plan view showing an internal configuration of a conventional tape pulling force measuring device.

[Explanation of symbols]

1, 40 ... tape pulling force measuring device, 2 ... cassette case, 4, 41 ... tape pulling force measuring reel,
5, 47 dummy reel, 10, 17, 43, inner ring, 12, 18, outer ring, 16 supply reel shaft, 25
... take-up reel shaft, 26 ... tape, 42 ... middle wheel, 4
9 ... belt.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-33104 (JP, A) JP-A-1-103033 (JP, U) JP-A-1-107028 (JP, U) JP-A 55-33104 73835 (JP, U) Real opening 58-163040 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01L 5/00 G11B 15/43

Claims (1)

(57) [Claims] 1. A tape pulling force measuring device for measuring a pulling force of a tape pulled out from a supply reel in a cassette case pulled by a capstan and wound on a take-up reel, wherein the supply reel in the cassette case is provided. The first inner ring and the first outer ring are rotatably supported on the middle wheel locked on the shaft side, and the supply reel shaft is rotated in conjunction with the first inner ring, A spring is interposed between the ring and the first outer ring, and the tensile force of the tape having one end fixed to the first outer ring is used to rotate the first outer ring with respect to the middle ring due to deformation of the spring. A measuring reel means for measuring the amount of the reel and a second inner ring rotatably disposed on the take-up reel shaft side in the cassette case in conjunction with the take-up reel shaft;
Take-up reel means for rotating a second outer ring rotatably supported by the inner ring in association with the second inner ring by an amount corresponding to the winding of the tape; And a rotation transmitting means for transmitting the rotation of the inner ring to the first inner ring of the measuring reel means, wherein the supply reel shaft rotates in conjunction with the rotation of the take-up reel shaft. Characteristic tape tension measuring device.