JPH0521709Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cassette for measuring tape tension of an auto-reverse type cassette tape recorder.

(Problems to be solved by conventional techniques and inventions) Conventionally, when measuring the tape tension of a cassette recorder, two types of measuring devices are required for normal and reverse play.
As a result, the structure became complicated and the operation became troublesome.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a supply side pinch roller insertion window 13b, a take-up side pinch roller, which can be loaded into the cassette mounting part of an auto-reverse type cassette type tape recorder. roller insertion window 13b',
Recording/playback head insertion window 14b, supply side capstan 1
2 insertion hole 12a and winding capstan 12'
a cassette casing 1 with an insertion hole 12a';
The inner ring 5 on the supply reel side and the inner ring 5' on the take-up reel side are fixed in a non-rotatable manner on both sides of the cassette casing 1 in a manner corresponding to each pinch roller insertion window 13b, 13b', and a bearing is installed on the outside of the inner ring 5 on the supply reel side. A supply reel side outer ring 4 rotatably fitted via a bearing 6, a take-up reel side outer ring 4' rotatably fitted to the outside of the take-up reel side inner ring 5' via a bearing 6, and a supply reel side outer ring 4'. A supply reel side spiral spring 7 which is interposed between the inner ring 5 and the supply reel side outer ring 4 and whose both sides are connected to the supply reel side inner ring 5 and the supply reel side outer ring 4 and which winds in the opposite direction to the tape supply direction, and A tape wound in the opposite direction to the winding direction, which is interposed between the inner ring 5' on the reel side and the outer ring 4' on the take-up reel side, and whose both ends are locked to the inner ring 5' on the take-up reel side and the outer ring 4' on the take-up reel side. The spiral spring 7 on the take-up reel side, the pointers 9, 9' provided on the inner ring 5 on the supply reel side and the inner ring 5' on the take-up reel side, and the scales provided on the outer ring 4 on the supply reel side and the outer ring 4' on the take-up reel side. Plates 8, 8' and cassette casing 1
A pair of supply side guide rollers 2 are supported on both sides inside the supply side pinch roller insertion window 13b.
a, 2b, a pair of take-up guide rollers 2a', 2b' which are supported on both sides inside the take-up pinch roller insertion window 13b' in the cassette casing 1, and one end of which is connected to the outer ring 4 on the supply reel side. A supply side tape 11 that passes around the outside of a supply side capstan 12, whose middle portion is wound around the supply rollers 2a and 2b and whose both ends are fixed to adjacent locations on the supply reel side outer ring 4, and whose one end side is attached to a take-up reel. The outer side of the take-up side capstan 12' is wound around the side outer ring 4', the middle part is hung on the take-up side guide rollers 2a' and 2b', and both ends are fixed to adjacent points on the take-up reel side outer ring 4'. It has a winding side tape 11' that passes through the winding side tape 11'.

(Embodiment) and (Operation) The following describes the normal (forward) play based on the embodiment shown in the drawings.

The inner ring of the supply reel 3, which is composed of an inner ring 5 and an outer ring 4, is fixed inside a cassette casing 1 that can be attached to the cassette mounting portion of a cassette type tape recorder. The inner ring and the outer ring are configured to slip against each other via a bearing 6. A spiral spring 7 is also interposed between the inner ring and the outer ring. This spiral spring causes the outer ring to rotate in a direction F opposite to the direction E in which the tape is wound relative to the inner ring fixed to the cassette.
The outer ring is always biased with a predetermined force so as to engage with a small hole 4a formed in a peripheral wall surface on one side of the outer ring, and the other end is bent so as to engage with a small hole 5a on the side surface of the inner ring.

The above-mentioned supply reel with both ends 4b and 4c of the tape 11 fixed to its outer ends is constructed by placing the tape over guide rollers 2a and 2b at two locations, respectively, which are positioned so that only the pinch roller insertion window 13b in the cassette runs in the direction. Store on both sides of the cassette.

The cassette with reels stored on both sides is loaded into the cassette loading section of the tape recorder, and the pinch roller 13a is inserted into the insertion window 1 by setting the forward mode.
Insert from 3b and attach capstan 1 with the tape in between.
2 and pulled in the normal C direction.

As the tape is pulled, the outer ring of the reel is rotated against the biasing force of the spiral spring. This outer ring rotates until the tension applied to the tape by the rotation of the pinch roller and the capstan and the biasing force of the spiral spring are balanced, and after the balance is achieved, the tape slips between the pinch roller and the capstan.

When the above tension is large, the rotation angle of the outer ring becomes large, and when it is small, it becomes small. This rotation angle is converted into tension by indicating the scale plate 8 provided on the outer ring with the pointer 9 provided on the inner ring.
It can be read in gf units.

Furthermore, a pinch roller is inserted into the cassette, and the recording/reproducing head 14a is inserted through the insertion window 14b, but since the tape is directly applied from the reel to the guide roller, parts of the recording/reproducing apparatus do not come into contact with the tape. The true tension value can be determined since no friction occurs.

(Effects of the invention) The cassette for tape tension measurement according to the invention can be loaded into the cassette mounting part of an auto-reverse type cassette tape recorder as described above, and has a supply side pinch roller insertion window 13b and a take-up side pinch roller. Insertion window 13b', recording/playback head insertion window 14
b, cassette casing 1 with insertion hole 12a of supply side capstan 12 and insertion hole 12a' of take-up capstan 12', and cassette casing 1;
Corner pinch roller insertion windows 13b, 13 are provided on both sides of the
a supply reel-side inner ring 5 and a take-up reel-side inner ring 5' fixed non-rotatably in a configuration corresponding to b';
A supply reel-side outer ring 4 is rotatably fitted to the outside of the supply reel-side inner ring 5 via a bearing 6, and a take-up reel is rotatably fitted to the outside of the take-up reel-side inner ring 5' via a bearing 6. a side outer ring 4′;
A supply reel side spiral spring 7 wound in the opposite direction to the tape supply direction, which is interposed between the supply reel side inner ring 5 and the supply reel side outer ring 4 and whose both sides are connected to the supply reel side inner ring 5 and the supply reel side outer ring 4; , the tape winding direction is interposed between the take-up reel side inner ring 5' and the take-up reel side outer ring 4', and both ends are locked to the take-up reel side inner ring 5' and the take-up reel side outer ring 4'. Take-up reel side spiral spring 7 wound in opposite direction
, the pointers 9 and 9' provided on the supply reel side inner ring 5 and the take-up reel side inner ring 5', and the supply reel side outer ring 4.
and a scale plate 8 provided on the outer ring 4' on the take-up reel side,
8', a pair of supply side guide rollers 2a and 2b which are supported on both sides inside the supply side pinch roller insertion window 13b in the cassette casing 1, and a pair of supply side guide rollers 2a and 2b which are supported on both sides of the inside of the supply side pinch roller insertion window 13b' in the cassette casing 1; A pair of take-up side guide rollers 2a', 2b' are supported on both sides of the winding side, and one end side is wound around the supply reel side outer ring 4, and the middle side is the supply side rollers 2a, 2b.
A supply side capstan 1 is hung on the supply side capstan 1 and has both ends fixed to adjacent locations on the supply reel side outer ring 4.
The supply side tape 11 passes through the outer side of 2, and one end is wound around the take-up reel side outer ring 4', the middle part is wrapped around the take-up side guide rollers 2a' and 2b', and both ends are adjacent to the take-up reel side outer ring 4'. It was fixed at the place where it was
Since it is characterized by having a take-up side tape 11' passing outside the take-up side capstan 12', it is possible to measure the tensile force of the tape during both normal and reverse play using an auto-reverse type cassette tape recorder. can be made possible with a single cassette, and this not only has the effect of completely solving the above-mentioned problems of the present invention, but also has the effect of completely solving the above-mentioned problems of the present invention. It does not require the troublesome work of pulling out the tape with a loading device to measure it, or applying a brake to the reel shaft to measure it, like the tape tension measuring device used in video tape recorders, and it is easy to configure and use. It is simple.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention.
The figure is a plan view showing the state of use, FIG. 2 is a half sectional view of FIG. 1, and FIG. 3 is a back view of the supply reel. 1...Cassette casing, 1a...Upper half, 1b...Lower half, 2a, 2a'...Guide roller, 2b, 2b'...Guide roller, 3...Reel, 4, 4'...Outer ring, 4a ...Spring retaining hole, 4b
...Tape hole, 4c...Tape hole, 5,5'
... Inner ring, 5a ... Spring retaining hole, 6 ... Bearing, 7 ... Spiral spring, 8, 8' ... Scale plate, 9,
9'...Pointer, 10...Inner ring fixing pin, 11,1
1'...tape, 12,12'...capstan,
13a, 13a'...pinch roller, 13b, 13
b'...pinch roller insertion window, 14a...head,
14b...Head insertion window.

Claims (1)

[Scope of utility model registration request] A supply side pinch roller insertion window 13b and a winding side pinch roller insertion window 1 that can be loaded into the cassette mounting part of an auto-reverse type cassette type tape recorder.
3b', a cassette casing 1 with a recording/reproducing head insertion window 14b, an insertion hole 12a of the supply side capstan 12, and an insertion hole 12a' of the take-up capstan 12', and pinch roller insertion windows 13b, 13b', the supply reel side inner ring 5 and the take-up reel side inner ring 5' are fixed in a non-rotatable manner, and the supply reel side outer ring is rotatably fitted to the outside of the supply reel side inner ring 5 via a bearing 6. 4, a take-up reel side outer ring 4' which is rotatably fitted on the outside of the take-up reel side inner ring 5' via a bearing 6, and a supply reel side inner ring 5 and a supply reel side outer ring 4. A supply reel side spiral spring 7 wound in the opposite direction to the tape supply direction and connected to the supply reel side inner ring 5 and the supply reel side outer ring 4 on both sides, a take-up reel side inner ring 5' and a take-up reel side outer ring 4'. A take-up reel side spiral spring 7 which is wound in the opposite direction to the tape winding direction and whose ends are interposed between the take-up reel side inner ring 5' and the take-up reel side outer ring 4', and a supply reel side inner ring. 5 and a pointer 9 provided on the inner ring 5' on the take-up reel side.
9', scale plates 8, 8' provided on the supply reel side outer ring 4 and the take-up reel side outer ring 4', and the supply side pinch roller insertion window 13 in the cassette casing 1.
A pair of supply side guide rollers 2a and 2b are supported on both sides of the inside of the cassette casing 1, and a pair of take-up side guide rollers are supported on both sides of the inside of the take-up side pinch roller insertion window 13b' in the cassette casing 1. 2a', 2
b' and the outside of the supply capstan 12, one end of which is wound around the supply reel outer ring 4, the middle part of which is wrapped around the supply rollers 2a and 2b, and both ends of which are fixed to adjacent locations on the supply reel outer ring 4. The supply side tape 11 passes through, one end is wound around the take-up reel side outer ring 4', and the middle is wound around the take-up side guide rollers 2a', 2.
a winding-side tape 11' that passes around the outside of the winding-side capstan 12', which is hung on the winding-side capstan 12' and has both ends fastened to proximate locations on the winding-reel side outer ring 4'. Cassette for measuring tape tension of reverse type cassette tape recorder.