KR810001151Y1 - Cassette for torque meter - Google Patents

Abstract

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Description

Cassette for tape tension or torque measurement

1 to 5 show an embodiment of the present invention,

1 is an exploded perspective view of a cassette.

2 is a rear view of a real herb.

3 is a plan view showing a state of use.

4 is an enlarged perspective view of the tape cleaner and the cleaner mounting portion.

5a and 5b are side views showing the shape of mounting the tape cleaner;

6 and 7 are main parts perspective views showing another embodiment of the tape cleaner mounting portion.

The present invention relates to a cassette for measuring tape tension in a magnetic recording and reproducing apparatus such as a cassette type tape recorder and a VTR.

In the cassette type magnetic recording and reproducing apparatus, when the cassette is mounted, the tape ejected from the supply rail is generally passed through the magnetic head in the guide roller, pressed and held by the capstan and the pinch roller, and then through the guide roller. Coiled up on the job. In this tape traveling path, the magnitude of the tension (tension force) applied to the tape from the supply rail to the pinch roller and the capstan is an important factor for running the tape stably. For this reason, in the design stage of this type of magnetic recording and reproducing apparatus, the tape tension of the prototype is measured and adjusted to an appropriate size. This tape tension is mainly determined by the pressing force between the pinch roller and the capstan. For this reason, when measuring tape tension conventionally, the said pressing force was measured with a spring balance, for example, and the tension which has a correlation with this pressing force was calculated | required. However, since this method is indirectly measuring tension, the error is likely to be large and requires hand. In addition, during the measurement of the same prototype several times, the tape may slip due to oil being attached and soiled in the vicinity of the pinch roller and the part held by the capstan. There was a case where the correct tension could not be obtained. Moreover, there is a case where the tension is not appropriately sized even when a predetermined pressing force is obtained, because a correlation between the pressing force and the tension is lost due to the change of time with the pinch roller. For this reason, when measuring the said pressing force at the time of repair by an after service of a product, for example, if the pinch roller was contaminated, the exact tension might not be calculated | required.

The present invention has been made in view of the above circumstances, and in the cassette provided with the tape tension or torque measuring means, a tape cleaning means is provided between the portion where the pinch roller is inserted and the supply rail hub.

Next, an example in the case where the present invention is applied to a tape cassette for a tape recorder will be described with reference to the drawings.

As shown in FIG. 1, the cassette for measuring tape tension (hereinafter simply referred to as cassette) 1 is mainly composed of a transparent synthetic resin, for example, a cassette base half 2 and a cassette cover half 3 formed by polystyrene, The tape supply rail hub 4, the tape winding reel hub 5, and the tape 6 wound 3 to 4 times in each of the reel hubs 4 and 5, respectively.

Guide pins (7) (8) and guide rollers (9) (10) of the tape (6) protrude from the base half (2), and the capstan insertion holes (11) (12) and the rail shaft insertion holes (13). (14) are respectively laid, and the rust ash head insertion window 54, the pinch roller insertion window 16, and the erase head insertion window 15 are formed. In addition, the magnetic shield plate 17 is attached, and a leaf spring 19 provided with tape pads 18 such as felt is attached to the magnetic shield plate 17. Moreover, between the insertion windows 54 and 16, the recessed part 56 for attaching the tape big liner 60 mentioned later as a detachable material is provided in the predetermined position. As shown in Fig. 4, notches 57 and 58 through which the tape 6 is inserted are provided in the recessed portion 56 so as to face each other.

The cap half insertion hole 20, 21 and the rail shaft insertion hole 22, 23 are laid in the cover half 3, and the rust ash head insertion window 55, the pinch roller insertion hole 25, and the eraser (消去) The head insertion window 24 is formed. In addition, as shown in FIG. 4, the recess 63 to which the tape cleaner 60 is mounted is installed at a position coinciding with the recess 56, and the notches 64 and 65 through which the tape 6 is inserted are notched. It is provided in the position which coincides with (57) (58).

The half (2) (3) configured as described above receives the real hub (4) (5) and the tape (6), and then fits each other at the five corners of the four corners of the four corners and the front part in the state where they are fitted together. 26) is stopped.

As shown in FIG. 4, the tape cleaner 60 is formed by integrally forming a synthetic resin or a metal plate in a substantially U-shaped shape, and a cleaner pad 61 made of felt or the like on two opposite inner surfaces thereof. 62 is bonded with a predetermined gap. When the tape cleaner 60 is mounted on the cassette 1, as shown in FIG. 5A, the tape 6 is formed in the recesses 63 and 56 with the U-shaped opening below the recess 63. As shown in FIG. ) Is inserted between the pads (61) and (62). As a result, as shown in FIG. 5B, the cleaner 60 is elastically mounted to the (63) and (56), and the felts (61) and (62) lightly contact the surface and the back side of the tape (6). (6) is narrowed.

Next, the supply rail hub 4 is constituted by the inner ring 27 and the outer ring 28 as shown in FIG. The inner ring 27 and the outer ring 28 are slipped from each other through the bearing 29.

In addition, as this slip means, for example, grooves and protrusions may be formed in the main surfaces of the inner ring 27 and the outer ring 28 to fit them. The inner ring 27 is fixed to the cassette 1 so that the rail shaft is inserted. For this reason, the pinholes 30 and 31 which penetrate the upper and lower surfaces are provided in the inner ring 27, and the pin holes 30 and 31 also coincide with the pinholes 30 and 31 in the half 2 and 3, respectively. 32 and 33 are provided. In the state where the hubs 4 and 5 are stored in the cassette 1, the lock pins 34 and 35 are inserted through these pinholes 30 to 33, so that the inner ring 27 can be inserted into the cassette 1. ) Is fixed. A spiral spring 36 is provided between the inner ring 27 and the outer ring 28. By this spiral spring 36, the outer ring 28 is always biased with a predetermined force in the direction of arrow B opposite to the arrow direction in which the tape 6 is wound relative to the inner ring 27 fixed to the cassette 1. ) One end of the spiral spring 36 is bent to engage the small hole 28b of the peripheral wall surface 28a formed on one surface of the outer ring 28, and the other end is bent to form a small hole on the side of the inner ring 27. 27a). On one surface of the outer ring 28 opposite to the one surface, a scale 37 for displaying the tension is provided in a 0-200 g bed in the case of illustration. At the same time, an index 38 for indicating the scale 37 is provided on the upper surface of the half 3.

The winding reel hub 5 is constituted by an inner ring 39 and an outer ring 40.

A spring 41 is interposed between the inner ring 39 and the outer ring 40. On the outer circumferential surface of the inner ring 39 and the inner circumferential surface of the outer ring 40 are respectively formed in connection with the circumferential direction of the narrow grooves 39a and 40a. The spring 41 is formed by bending a single strand of wire as shown in the drawing. The spring 41 elastically abuts each curved portion with the groove 40a of the outer ring 40, while bending each of the curved portions to make the inner ring 39 Is elastically abutted on the groove 39a of the (). Both ends of the spring 41 are engaged with the small holes 40b provided in the grooves 40a. Moreover, the inner ring 39 is accommodated in the cassette 1 by rotation material, and is inserted in the rail shaft.

3 shows the state of use of the cassette 1 constructed as described above, and the cassette 1 is normally mounted in the cassette mounting portion of the tape recorder. That is, the rail shafts 42 and 43 are inserted into the inner rings 27 and 39 of the rail hubs 4 and 5, and the capstan 44 is inserted into the capstan insertion holes 12 and 21. In addition, the tape recorder is set in the forward, and the pinch roller 45 is inserted in the insertion windows 16 and 25 so that the tape recorder is crimped to the capstan 44 by sandwiching the tape 6. The pinch roller 45 is attached to the rotation lever 48 having the point 47 provided on the mechanical substrate 46. Pins 49 and 50 protrude from the mechanical substrate 46, and springs 51 are wound around the pin 49. One end of the spring 51 is elastically abutted against the pin 50, and the other end is elastically engaged with the recess 52a of the protrusion piece 52 integrally formed on the side of the lever 48. As a result, the pinch roller 45 is pressed against the capstan 44. In addition, the rust ash head 53 is inserted into the cassette 1 through the insertion windows 7 and 18, and the erasing head 70 is inserted into the insertion windows 15 and 24.

Next, the operation based on the structure of FIG. 1-FIG. 3 is demonstrated.

When the motor of the tape recorder is driven to rotate the capstan 44 and the take-up reel shaft 42, the pinch roller 45 is rotated to pull the tape 6 in the direction of arrow C. At the same time, the inner ring 39 of the take-up work hub 5 rotates in the direction of the arrow. This rotation is transmitted to the outer ring 40 through the spring 41, whereby the tape 6 on which the tape 6 is wound is pulled in the direction of arrow C, whereby the outer ring 28 of the rail hub 4 is pulled out. Is rotated in the direction of the arrow E against the biasing force of the helical spring 36. The outer ring 28 is tensioned in the direction of the arrow C applied to the tape 6 by the compression rotation between the pinch roller 45 and the capstan 44 until the convenience of the spiral spring 36 is balanced. After rotating and balancing, the tape 6 slips between the pinch roller 45 and the capstan 44. In this case, when the tension is large, the rotation angle of the outer ring 28 is large, and when the tension is small, the rotation angle is small. This rotation angle is converted into tension by the indicator 38 instructing the scale 37 provided on the outer ring 28 and can be read out in g units.

In addition, when the tape 6 is wound in the direction of arrow C, the dirts on both sides of the tape 6 are cleaned by the pads 61 and 62 of the cleaner 60, and then the pinch roller 45 and the capstan ( 44), the tape 6 does not slip and an accurate tension can be measured.

In this case, the cleaner 60 is provided in the position demonstrated below.

That is, if the diameter of the outer ring 28 of the supply rail have 4 is ø and the rotation angle until the outer ring 28 is balanced is θ, the length L1 of the tape 6 wound at this time is

Becomes

If the length from the cleaner 60 to the pinch roller 45 and the capstan 44 is L, this cleaner 60 is installed at a position such that L &lt; In general, the size of the tension to be measured is not extremely different, and there is a non-uniformity within a certain range, so that the portion pinched by the pinch roller 45 and the capstan 44 of the tape 6 is also placed on the tape 6. Will move within a certain range. Therefore, L ₁ is obtained by the above equation at the rotation angle θ corresponding to the maximum tension of the non-uniformity range, and the cleaner 60 is placed at the position of L <L ₁ , thereby making the dirt in the above range on the tape 6 uneven. It becomes possible to wash the.

Next, after the tape 6 slips between the pinch roller 45 and the capstan 44 by the balance, the outer ring 40 of the reel hub 5 moves the tape 6 in the direction of arrow D. Pulled and stopped.

At this time, the inner ring 39 rotates on the rail shaft 42, but since the spring 41 slips in the groove 39a of the inner ring 39, only the inner ring 39 continues to rotate. Thus, for example, the cassette 1 is applied to a tape recorder provided with a so-called auto shut-off means which detects the tape end by rotating stop of the take-up shaft and automatically makes a stop state based on this detection. In this case, since the take-up single shaft 42 can be rotated at all times, it is possible to prevent the auto shutoff means from operating at the time of the slip. In the case of a tape recorder without an auto shutter means, the inner ring 39 and the outer ring 40 of the reel hub 5 may be integrally formed. ), A force higher than the tension by the pinch roller 45 and the capstan 44 can be prevented.

Next, a method of obtaining a predetermined tension by adjusting the pressing force between the pinch roller 45 and the capstan 44 will be described.

The pressing force can be adjusted in FIG. 3 by, for example, changing the position of the point 47 of the lever 48 or by changing the position of the pin 50. In other words, by shifting the position of the point 47 in the direction of the arrow F, the compression force can be enhanced and the tension can be increased, and the pin 50 is shifted in the direction of the arrow G to increase the effect of the spring 51 to increase the tension. have. In addition, a plurality of small holes are provided in the mechanical substrate 46 in the direction of the arrow G, and one end of the springs 51 is selectively held so that the effect of the springs 51 can be adjusted. good. In addition, various methods, such as replacing the spring 51 and washing the pinch roller 45, may be used.

6 and 7 show another embodiment of a portion for mounting the cleaner 60 of the cassette 1.

6 shows that the length l ₂ of the cleaner mounting recess 66 is larger than the width l ₃ of the cleaner 60, and FIG. 7 shows three cleaner mounting recesses 67 in the cassette 1. 68) and 69 are installed. According to the above structure, the cleaner 60 is mounted at any position of the recess 66 in FIG. 6, and the cleaner 60 is recessed 67, 68, 69 in FIG. 7. By selectively attaching to one of the above), when there is a significant nonuniformity in the rotation angle θ of the supply rail hub 4, that is, the measured tension, all of these nonuniformities can be covered and measured.

Although the above-described embodiment is applied to a so-called compact cassette for a tape recorder, the present invention can be applied to various cassettes such as a cassette for a VTR and a large cassette.

In addition, the above description has been made of the case where the present invention is applied to a tape tension measuring cassette, but the present invention can be applied to a known torque measuring cassette for measuring winding torque in a state of mounting on a tape cassette. It may be. In order to measure the cassette according to the above embodiment, for example, the inner ring 27 of the supply rail hub 4 is rotated with respect to the cassette 1, and the scale 37 is corrected to show torque. do.

According to the present invention, a tape supply rail hub and a tape winding rail hub, each of which has a tape wound thereon, and a tape tension or torque measuring means provided therein, wherein a pinch roller is inserted between the feed rail hub and the supply rail hub. A cassette for tape tension or torque measurement, characterized in that a tape cleaning means is provided at a predetermined position of a tape running path.

Therefore, according to the present invention, the following effects can be obtained.

(One). Since the tape tension or torque is measured directly, accurate measurements can be obtained.

(2). Since the tape tension is measured directly, it is possible to determine whether the tape running stain is caused by a decrease in tension caused by the pinch roller and the capstan or by other causes.

(3). Since the tape cleaning means is provided, the tape does not cause slippage or the like, and accurate measurement can be performed.

(4). By attaching it to a tape recorder etc. like a normal cassette, it can measure easily. For this reason, it is the most suitable to use it especially for after service.

Claims (1)

In the cassette 1 shown in the drawings and as described above in the main body, the tape supply rail hub 4 and the tape winding rail hub 5, each of which has been wound with a tape, are housed and provided with tape tension or torque measuring means. And a tape cleaner (60) having a U-shaped cross section at a predetermined position so that the tape (6) is sandwiched inside the U-shaped opening through the U-shaped opening.