JPH04274721A - Measuring apparatus of tensile force of tape - Google Patents

Abstract

PURPOSE:To measure the tensile force of a tape effectively even in a tape apparatus wherein a feed reel shaft is rotated in association with the rotation of a wind reel shaft, and the tape is automatically stopped and/or reversed when the rotation of the feed reel shaft is detected to be stopped. CONSTITUTION:A tape tensile force measuring apparatus 40 measures the tensile force of a tape 26 which is taken out from a feed reel in a cassette case 2 by a capstan 31 and wound around a wind reel. The apparatus consists of a middle ring 42 having a measuring reel means fitted in the cassette case 2, and a first inner ring 43 and a first outer ring 12 which are rotatably supported with respect to the middle ring 42. The rotation of a second inner ring 17 of a wind reel means 47 is transmitted to the first inner ring 43 by a rotation transmitting means.

Description

[Detailed description of the invention]

0001

[Table of Contents] The present invention will be explained in the following order. Industrial application field Prior art (Figs. 3 and 4) Problems to be solved by the invention (Figs. 3 and 4) Means for solving the problems (Figs. 1 and 2) Effects (Figs. 1 and 2)
) Example (Figures 1 and 2) Effects of the invention

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape tensile force measuring device, and is suitable for use in, for example, measuring the tape tensile force of an audio tape recorder.

0003

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

Therefore, in a tape recorder, it is necessary for the capstan and the pinch roller to pull the magnetic tape with a predetermined tensile force, and in order to measure this tensile force, a method such as that disclosed in Japanese Utility Model Publication No. 14924/1983 is used. A cassette-type tape tensile force measuring device is used to check the operation of tape recorders in the manufacturing process and to investigate the cause of failure during service.

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

Inside the cassette case 2, instead of the supply reel and take-up reel of the tape cassette, a tape tensile force measuring reel 4 is arranged on the supply reel shaft side, and a dummy reel 5 is arranged on the take-up reel shaft side. ing.

This tape tensile force measuring device 1 is loaded into a tape recorder like a normal tape cassette, and the magnetic tape wound on the tape tensile 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 a scale 6 in a window formed in the cassette case 2.

Actually, as shown in FIG. 4, the tape tensile force measuring reel 4 of this tape tensile force measuring device 1 is connected to the cassette case 2 by a pair of pins 8 and a pair of small holes 9.
and an outer ring 12 rotatably supported with respect to the inner ring 10 by a ball bearing 11.
It is composed of.

[0009] A spiral spring is interposed between the inner ring 10 and the outer ring 12, with the inner end and outer end thereof being fixed to the inner ring 10 and the outer ring 12, respectively, so that the spiral spring rotates in the opposite direction to the rotation of the supply reel. It is urged to rotate in the clockwise direction.

In addition, a reel shaft insertion hole 13 is formed through the inner ring 10 at its center, and a plurality of protrusions 15 formed on the inner peripheral surface side of this reel shaft insertion hole 13 allow
A 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 has an inner ring 17 and an outer ring 1.
A bar spring 19 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 square apex of the bar spring 19 is received in a groove 21 formed in the inner peripheral surface of the outer ring 18. , each side of the rectangle 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
is rotatably supported by the cassette case 2.

Furthermore, a reel shaft insertion hole 23 is formed through the inner ring 17 at its center, and a plurality of protrusions 24 formed on the inner peripheral surface side of this 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 connected to the outer ring 12 of the tape tensile force measuring reel 4 and the outer ring 1 of the dummy reel 5.
8 and wound around the respective reels 4 and 5, and further guided by tape guide rollers 27, 28 and tape guide pins 29 and housed in the cassette case 2.

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

The capstan 31 rotates at a constant speed, and a tensile force is exerted on the tape 26. In reality, this tensile force is a force that attempts to rotate the outer ring 12 of the tape tensile force measurement reel 4 in a counterclockwise direction.

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

[0017]

[Problem to be Solved by the Invention] In the conventional tape recorder, the rotational state of the supply reel shaft is monitored,
When it detects that the supply reel has stopped rotating, it determines that the tape has reached the end, and performs the so-called auto-shut-off operation that cancels playback and recording operations, and the auto-reverse operation that reverses the running direction of the tape. There are things that have been made to do so.

However, when trying to measure the tape tensile force using the above-mentioned tape tensile force measuring device 1 for a tape recorder having an auto-shutoff function and an auto-reverse function, the inner ring of the tape tensile force measuring reel 4 10 is locked to the cassette case 2, the supply reel shaft 16 is always in a stopped state.

Therefore, before the tensile force acting on the tape 26 and the elastic restoring force of the spiral spring are balanced and the rotation of the outer ring 12 is stopped, the above-mentioned auto-shut-off operation and auto-reverse operation are continuously repeated. As a result, there was a problem in that the tape tensile force measuring device 1 could not measure the tape tensile force.

The present invention has been made in consideration of the above points, and provides a tape tensile force measuring device that has a simple configuration and can reliably measure tape tensile force even in tape recorders having an auto-shutoff function and an auto-reverse function. This is what we are trying to propose.

[0021]

[Means for Solving the Problems] In order to solve the problems, in the present invention, the tape 26 is pulled by the capstan 31, drawn out from the supply reel in the cassette case 2, and wound on the take-up reel. In the tape tensile force measuring device 40 for measuring force, the cassette case 2
A first inner ring 43 and a first outer ring 12 are rotatably supported with respect to an intermediate ring 42 that is locked on the inner supply reel shaft 16 side, and the supply reel shaft is interlocked with the first inner ring 43. 16 is rotated, a spring 50 is interposed between the middle ring 42 and the first outer ring 12, and the tensile force of the tape 26 whose one end is fixed to the first outer ring 12 is applied to the first outer ring 16 by the deformation of the spring 50. The measuring reel means 41 measures the amount of rotation of the outer ring 12 relative to the inner ring 42, and the second inner ring 17 rotatably disposed on the take-up reel shaft 25 side in the cassette case 2 is connected to the take-up reel shaft. For winding, the second outer ring 18, which is rotatably supported with respect to the second inner ring 17, is rotated in conjunction with the second inner ring 17 for winding the tape 26. Reel means 47 and take-up reel means 4
Rotation transmitting means 48 and 49 for transmitting the rotation of the second inner ring 17 of No. 7 to the first inner ring 43 of the measuring reel means 41 are provided.

[0022]

[Operation] The measuring reel means 41 is composed of a middle ring 42 that is locked in the cassette case 2, a first inner ring 43 and a first outer ring 12 that are rotatably supported with respect to the middle ring 42. By transmitting the rotation of the second inner ring 17 of the take-up reel means 47 to the first inner ring 43 by the rotation transmission means 48 and 49, the supply reel is rotated in conjunction with the rotation of the take-up reel shaft 25. The shaft 16 rotates, thus supplying reel shaft 16
The tape tension force can also be effectively measured for a tape device that detects rotation stoppage and performs an automatic stop operation and/or tape reversal operation.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 in which parts corresponding to those in FIG. 4 are given the same reference numerals.
, reference numeral 40 indicates the tape tensile force measuring device as a whole according to the present invention, and a tape tensile force measuring reel 41 includes a middle ring 42 secured to the 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 the inner ring 42.
2, and an inner ring 43 rotatably disposed inside the middle ring 42 with a predetermined gap therebetween.

A reel shaft insertion hole 4 is provided at the center of this inner ring 43.
5 is formed through the reel shaft insertion hole 45.
The tape tensile force measuring reel 42 is engaged with the supply reel shaft 16 of a tape recorder (not shown) by a plurality of protrusions 46 formed on the inner circumferential surface of the reel 42 .

Here, the inner ring 43 of the tape tensile force measuring reel 42 is selected to have a slightly higher height than the outer ring 12 and the middle ring 42, as shown in the sectional view of FIG. A pulley consisting of a groove of a predetermined depth is integrally formed on the circumference of a portion that protrudes a predetermined amount from the pulley.

The inner ring 17 of the dummy reel 47 is also selected to have a slightly higher height near the center than the surroundings, and a pulley 48 having a groove of a predetermined depth is integrally molded on the circumference of the portion that protrudes by a predetermined amount. A reel 42 for measuring tape tensile force is formed.
A belt 49 is stretched between the inner ring 43 and the inner ring 43.

As a result, when the inner ring 17 of the dummy reel 47 rotates in conjunction with the rotation of the take-up reel shaft 25, this rotation is transmitted to the inner ring 43 of the tape tensile force measuring reel 42 by the belt 49. As a result, the inner ring 43 rotates in the rotational direction of the take-up reel shaft 25, and the supply reel shaft 16 rotates in conjunction with this.

With the above configuration, when the tape tensile force measuring device 40 is loaded into a tape recorder in the same way as a normal tape cassette, the capstan 31 is placed on the back side of the tape 26 through the through hole 30 formed in the cassette case 2. As the tape 26 is inserted, a pinch roller 32 is pressed from the front side of the tape 26.

The capstan 31 rotates at a constant speed, and a tensile force thereby acts on the tape 26. In reality, this tensile force is a force that attempts to rotate the outer ring 12 of the tape tensile force measurement reel 41 in a counterclockwise direction.

Therefore, the outer ring 12 rotates counterclockwise with respect to the inner ring 42 while elastically deforming the spiral spring 50.
The rotation of the outer ring 12 is stopped when the tensile force acting on the tape 26 and the elastic restoring force of the spiral spring 50 are well balanced, and the tape tensile force is measured from the value on the scale 6 indicated by the pointer 7 at this time. It is possible.

[0032] Also, such a tape tensile force measuring device 4
0 to measure the tape tensile force of a tape recorder having an auto-shutoff function or an auto-reverse function, the tape tensile force measuring device 40 may be loaded into the tape recorder in the same manner as described above.

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

In this way, the reel 4 for measuring tape tensile force
1, the inner ring 43 of the tape tensile force measuring reel 41 and the supply reel shaft 16 of the tape recorder rotate, thereby performing the above-mentioned auto-shut-off operation and auto-reverse operation. is not performed, and the tape tensile force can be measured by the tape tensile force measuring device 40.

According to the above structure, the tape tensile force measuring reel 41 is attached to the middle ring 4 which is locked in the cassette case 2.
2, an inner ring 43 and an outer ring 12 rotatably supported with respect to the middle ring 42, and the inner ring 1 of the dummy reel 47
7 is transmitted to the inner ring 43 of the tape tensile force measuring reel 41 through the pulley 48 formed on the inner ring 17 and the belt 49.
5, the supply reel shaft 16 can be rotated in conjunction with the rotation of the supply reel shaft 16, and thus the tape tension force can be effectively controlled even in a tape recorder that detects the stoppage of rotation of the supply reel shaft 16 and executes an auto-shut-off operation or an auto-reverse operation. It is possible to realize a tape tensile force measuring device 40 that can measure .

In the above embodiment, the tape tensile force is displayed using a pointer and a scale formed on the outer ring of the tape tensile force measuring reel. In addition, 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 tensile force based on changes in the amount of light passing through the transmission holes. Effects similar to those of the embodiments described above can be achieved.

In the above embodiment, the inner ring of the tape tensile force measuring reel and the inner ring of the dummy reel were connected by a belt, and the supply reel shaft was rotated in conjunction with the rotation of the take-up reel shaft. The transmission means is not limited to this, for example, the same effect as the above embodiment can be achieved by using various transmission means such as a combination of gears and chains.

Further, in the above-described embodiment, the case was described in which the tape tensile force of an audio tape recorder was measured, but the present invention is not limited to this, and can be applied to a video tape recorder (VTR), a digital audio tape recorder (DAT), etc. It is widely applicable and suitable for measuring the tape tensile force of recording and reproducing devices for various tape-shaped recording media.

[0039]

As described above, according to the present invention, the measuring reel means is connected to the middle ring which is locked in the cassette case, and the first inner ring and the first inner ring which are rotatably supported with respect to the middle ring. 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 rotates in conjunction with the rotation of the take-up reel shaft. It is possible to realize a tape tensile force measuring device that can measure the tape tensile force even for a tape device that rotates and thus detects the stoppage of rotation of the supply reel shaft and performs an automatic stop operation and/or tape reversal operation.

[Brief explanation of the drawing]

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

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

FIG. 3 is a schematic diagram showing the appearance of the tape tensile force measuring device.

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

[Explanation of symbols]

1, 40... Tape tensile force measuring device, 2... Cassette case, 4, 41... Tape tensile 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 ring, 49...
…belt.

Claims (1)

[Claims] 1. A tape tensile force measuring device for measuring the tensile force of a tape that is pulled by a capstan, drawn out from a supply reel in a cassette case, and wound on a take-up reel, wherein the tape is pulled by a capstan and taken up on a take-up reel. A first inner ring and a first outer ring are rotatably supported with respect to a middle ring that is locked on the shaft side, and the supply reel shaft is rotated in conjunction with the first inner ring, and the middle ring 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, one end of which is fixed to the first outer ring, is applied to the rotation of the first outer ring with respect to the middle ring due to the deformation of the spring. A measuring reel means for measuring the quantity, and a second inner ring rotatably arranged on the take-up reel shaft side in the cassette case are rotated in conjunction with the take-up reel shaft, and the second inner ring is rotated in conjunction with the take-up reel shaft.
a take-up reel means for rotating a second outer ring rotatably supported with respect to the inner ring of the tape in conjunction with the second inner ring for winding the tape; and rotation transmitting means for transmitting the rotation of the second inner ring of the measuring reel means to the first inner ring of the measuring reel means, and the supply reel shaft rotates in conjunction with the rotation of the take-up reel shaft. Features a tape tensile force measuring device.