JPS6215872Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a tape whose both ends are fixed to a supply reel and a take-up reel, and on which measurement signals are recorded in advance, from the supply reel side to the The present invention relates to a device for causing a tape to travel toward a take-up reel, reproducing the measurement signal by a reproducing head, and determining the tape driving ability of the capstan and the pinch roller based on the reproducing signal from the reproducing head. .

Normally, after a cassette tape recorder is manufactured, it is inspected to see if it has a predetermined function. This inspection also includes an inspection of whether the capstan and the pinch roller can pull out the tape from the reel with a predetermined load torque, that is, an inspection of the running performance of the tape. Conventionally, the tape running performance has been tested by attaching a tape cassette to a tape recorder and determining whether the tape runs correctly. However, since the reel in the tape cassette does not necessarily have a constant load torque (i.e., the tension applied to the tape), the reel in the tape cassette does not necessarily have a constant load torque (i.e., the tension applied to the tape). If it is attached to a tape recorder, the tape will no longer be able to run. In such a case, there is an inconvenience in that the tape recorder is treated as having a defect in its running performance, even though the tape cassette is originally defective.

Therefore, in order to judge the quality of the tape running performance of a tape recorder, a measurement signal (for example, a 3kHz reference frequency signal) is recorded in advance on the tape of a normal tape cassette (for example, a Philips type compact cassette). A tape cassette for measuring wow and flutter has been used in the past, in which the tape cassette is attached to a tape recorder and the tape is run in normal FWD mode, and the above signal is reproduced to measure the wow and flutter of the tape running. The quality of the tape running performance was determined based on the wow and flutter values (unit: %) measured using this tape cassette.

However, with conventional tape cassettes of this type, it was only possible to measure wow and flutter under conditions where the back tension unique to the tape cassette was applied to the tape.
Tape tension tolerance (e.g. 5
~15 g ^- cm), it was not possible to know the actual tape driving capacity of the capstan and pinch roller of the tape recorder to be tested. Therefore, if the tape does not run normally even after a tape cassette is installed in the tape recorder and the tape is set to the specified mode, it is not possible to accurately determine whether the tape recorder or the tape cassette is defective. This has caused the inconvenience that repairs cannot be carried out properly and quickly.

The present invention was devised in view of the above-mentioned circumstances, and includes a tape on which measurement signals are recorded in advance, and both ends of the tape are fixed to a supply reel and a take-up reel and wound. The supply reel of the pair of reels is composed of an inner ring and an outer ring to which one end of the tape is fixed, and means for fixing the inner ring to the cassette housing is provided, and A magnetic load mechanism is provided therebetween so that the outer ring is rotated with respect to the inner ring against the load of the magnetic load mechanism, and an adjustment structure that allows the load to be adjusted to an arbitrary value. a measuring cassette provided on the inner ring side, a capstan and a pinch roller that press the tape against the tape in order to drive the tape from the supply reel side to the take-up reel side; A reproducing head for slidingly contacting the driven tape and reproducing the signal recorded on the tape, and an electrical measuring means for electrically measuring the signal reproduced by the reproducing head. The present invention relates to a tape drive ability determination device that includes a capstan and a pinch roller.

Therefore, according to the present invention, it is possible to easily know the actual tape driving capacity based on the tape pulling torque generated by the capstan and the pinch roller, and it is possible to determine whether the cause of the defect is in the tape recorder or the tape cassette during the manufacturing process or repair of the tape recorder. You can easily determine whether there is one.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape drive capability determination device for a cassette tape recorder to which the present invention is applied will be described below with reference to the drawings.

1 to 3 show a measuring tape cassette 1, in which a supply reel 3 and a take-up reel 4 are housed, respectively, in a pair of upper and lower cassette halves 2a and 2b made of synthetic resin. The lower cassette half 2b is formed into a thin box shape, and the upper cassette half 2a has a pair of reel shaft insertion holes 5.
are formed, and the peripheral edges of these reel shaft insertion holes 5 protrude inside the cassette to form bosses 6. The supply reel 3 and take-up reel 4 are rotatably supported by these bosses 6 within a cassette casing 7 consisting of upper and lower cassette halves 2a and 2b.

Both ends of a magnetic tape 8 on which a measurement signal (for example, a 3kHz reference frequency signal) is recorded in advance are fixed to the outer circumference of the supply reel 3 and the take-up reel 4, respectively. It is wound around the supply reel 3 and the take-up reel 4. The magnetic tape 8 is stretched across a pair of pinch roller insertion holes 10 and a head insertion hole 11 formed in the front surface of the cassette casing 7 by a pair of tape guides 9.
Capstan insertion holes 12 are provided on the upper and lower surfaces of the cassette casing 7 in the vicinity of the pinch roller insertion holes 10. Further, a pad 15 is disposed inside the head insertion hole 11 and is fixed to a leaf spring 14 via a support plate 13.

Also, a supply reel 3 is attached to the upper cassette half 2a.
A hub fixing plate 16 is pivotally supported on one side of the reel shaft insertion hole 5, which is the side where the reel shaft insertion hole 5 is disposed. That is, the hub fixing plate 16 has a base end 16a pivotally supported on the upper cassette half 2a by a hinge member such as a hinge 17. Further, a hub engaging portion 18a is attached to the tip end portion 16b of the hub fixing plate 16, which is inserted into the reel shaft insertion hole 5 and engages with the inner ring hub 18 of the supply reel 3.

Next, the supply reel 3 will be explained with reference to FIG. 4. This supply reel 3 includes an inner ring 19 integrated with an inner ring hub 23, an outer ring 20 disposed on the outer periphery of the inner ring 19, and the inner ring 19 and the outer ring 20.
It is composed of a hysteresis plate 21 and a magnet 22 which are arranged relative to each other.

In addition, the inner ring 19 is divided into two parts, a first inner ring 19A and a second inner ring 19B, and a reel shaft insertion hole 2 is provided inside the first inner ring 19A.
A plurality of protrusions 23B that are engaged with the reel shaft of a tape recorder or the hub engaging portion 18 are provided on the inner circumferential surface of the inner ring hub 23 having a diameter of 3. The hub engaging portion 18 or the reel shaft of a tape recorder is configured to be engaged with the protrusion.

Further, an annular flange portion 24 protruding in the outer radial direction is formed near the center of the outer peripheral surface of the first inner ring 19A, and this flange portion 24 has a plurality of through holes penetrating in the axial direction. A screw hole 25 is threaded, and an adjustment screw 26 can be freely screwed into the screw hole 25.
Further, a stepped portion 27 is formed on the inner upper surface of the flange portion 24 to form an outer ring holder, and an outer ring holding plate 28 is detachably attached to the axially upper end of the first inner ring 19A with a set screw 29. Fixed. That is, the inner diameter end portion 20A of the outer ring 20 is loosely fitted and supported between the step portion 27 and the presser plate 28, and is rotatable. Further, an elastic support plate 30 is detachably fixed to the lower end of the first inner ring 19A in the axial direction by a set screw 31 so as to project outward.

The second inner ring 19B is the first inner ring 19A.
It is sandwiched between the adjustment screw 26 and the elastic support plate 30, and is disposed and supported on the outer diameter side of the first inner ring 19A.

The second inner ring 19B has a stepped portion 33 on its lower surface on the inner diameter side, into which the elastic body 32 is fitted, and a recessed portion 34 on the upper surface on the inner diameter side, into which the tip of the adjustment screw 26 is press-fitted. has been done. moreover,
A magnet 22 is attached to the upper surface of the second inner ring 19B on the outer diameter side together with a magnet reinforcing plate 35.

Next, the outer ring 20 will be described. The outer ring 20 is provided with a tape winding part 36 to which one end of the magnetic tape 8 is attached on the outer diameter part, and an outer ring holding plate of the inner ring 3 is provided on the inner diameter end 20A. A loosely fitting portion 38 is formed between the inner ring 3 and the stepped portion 27 and is connected to the outer ring holder, and the inner ring 3 is rotatably supported by the loosely fitting portion 38. A screw hole 3 is provided in the radial portion 20B of the outer ring 20 at a position corresponding to the through screw hole 25 of the inner ring 3.
9 is opened, and the adjustment screw 26 screwed into the through-screw hole 25 can be rotated through the hole 39 with a tool such as a screwdriver to advance or retract it. Further, a hysteresis plate 21 is disposed and supported in the radial portion 20B so as to face the magnet 22 disposed on the inner ring 3 side while maintaining a constant gap 40 therebetween. As a result, the hysteresis plate 21 and the magnet 22 rotate relative to each other as the outer ring 20 rotates, so hysteresis loss occurs within the hysteresis plate 21, and attraction due to the residual magnetism at that time occurs. A force acts on the magnet and a certain load torque is applied to the outer ring 20, and this load torque is applied to the magnetic tape 8.
It has come to work as a back tension.

The magnet 22 is formed of a rubber magnet or a plastic magnet into an annular shape, as shown in FIG.
It is configured such that different polarities are arranged alternately in the circumferential direction.

Here, to describe how the determination device having the above configuration is used, first, a screwdriver is inserted into the screw hole 39 of the outer ring 20 of the supply reel 3, and the tip of the screwdriver is engaged with the adjustment screw 26.
is rotated, thereby adjusting the gap 40 between the hysteresis plate 21 provided on the outer ring 20 and the magnet 22 provided on the second inner ring 19B of the inner ring 3, and finely adjusting and setting the magnetic load. put. At this time, the elastic body 32 always moves the second inner ring 19B to the first inner ring 19A.
The adjustment screw 26 is pressed against the side and does not play.

Then, the hub fixing plate 16 is superimposed on the cassette casing 7, and the hub engaging portion 18 is inserted into the reel shaft insertion hole 5 of the upper cassette half 2a to fix the inner ring hub 23. In this state, when the cassette is loaded into the tape recorder and placed in the forward state, the tape 8 receives the tape driving force from the capstan 41 and the pinch roller 42 and moves onto the supply reel 3.
It runs from the side toward the take-up reel 4 and comes into sliding contact with the magnetic head 43. Then, the magnetic head 43 reproduces a frequency signal of, for example, 3 kHz recorded in advance on the tape 8, and this reproduced signal is observed with, for example, an oscilloscope, thereby measuring the running state of the tape.

In this case, the outer ring 20 of the supply reel 3 is generally
The load torque applied to the magnetic tape 8
When the buck tension applied to becomes large, there is a limit to the tape pulling torque by the capstan 41 and the pinch roller 42, and the magnetic tape 8 cannot be driven at a constant speed, causing fluctuations in tape running and gradually increasing wow and flutter. With,
The tape running speed also becomes uneven. Therefore, for example, a limit line shown by the straight line A in FIG. 6 is determined in advance, and the capstan 41 and pinch roller 4 of the tape recorder to be inspected are
2 and determine the tape drive ability. That is, the sixth
In the figure, the area above straight line A is the area where the tape recorder is considered to be defective, and the area below it is the area where the tape recorder is considered to be normal. Determine whether driving performance is good or bad.
In addition, the measurement range of back tension is 5 to 15 g.
^- If the measurement curve within the range of cm shifts from the lower region to the upper region of the straight line A,
It can be determined that the back tension value at that time is the upper limit of the tape driving ability of the capstan 41 and pinch roller 42 of the tape recorder.

In this way, by measuring the wow and flutter while running the magnetic tape 8 and adjusting the back tension of the magnetic tape 8, the tape driving ability of the capstan 41 and the pinch roller 42 in the tape recorder to be tested can be evaluated. It can be easily determined.

Note that when the tensile torque applied to the magnetic tape 8 by the capstan and the pinch roller is smaller than the load torque applied to the outer ring 20, the outer ring is 20 is prevented from rotating, and the magnetic tape 8 is not fed out from the outer ring 20.
Therefore, if the running of the magnetic tape 8 is stopped even though the load torque applied to the outer ring 20, that is, the back tension applied to the magnetic tape 8 is, for example, 15 g ^- cm or less, the tape recorder side It can be determined that there is a defect.

In addition, during this inspection, the cassette casing 7
If all of the inner magnetic tape 8 has been wound onto the reel 4 on the winding side, it will no longer be possible to perform any further inspection, so turn the hub fixing plate 16 upwards and insert it into the inner hub 23. By removing the engaged hub engaging portion 18, making the inner ring 19 rotatable relative to the cassette casing 7, and setting the tape recorder to rewind mode, the magnetic tape 8 is rewound to the outer ring 20 side. good.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the technical idea of the present invention.

Further, in the above embodiment, the present invention is applied to a tape running performance testing device for a cassette type tape recorder, but the present invention can also be applied to a tape running performance testing device for an open reel type tape recorder.

Further, in the above embodiment, the magnet 22 is provided on the inner ring 3 side and the hysteresis plate 21 is provided on the outer ring 20 side, but the magnet 22 is fixed to the outer ring 20,
The hysteresis plate 21 may be provided on the inner ring 3 side.

As described above, the present invention runs a tape on which measurement signals have been recorded in advance, and measures the wow and flutter of the tape run to determine the tape driving ability of the capstan and pinch roller. It is. Therefore, from the relationship between the pack tension and the wow/flutter, it is possible to easily and quickly know the actual tape driving capability of the capstan and pinch roller within the pack tension tolerance range, and thereby, the recording and playback performance can be easily and quickly determined. It is possible to accurately determine whether the tape running performance of the device is good or bad. Therefore, appropriate and prompt measures can be taken when inspecting or repairing the recording/reproducing device. Furthermore, since the wow and flutter of the tape running is electrically measured, the measurement accuracy is good, and there is an advantage that the tape driving ability can be accurately determined.

Further, in the present invention, the back tension force can be easily changed and adjusted even after the determination device is completed.

Moreover, the torque acting between the magnet and the hysteresis plate that make up the magnetic load mechanism generally varies by, for example, ±10% or more when mass-produced, but this variation can be easily reduced by the amount of air gap between the magnet and the hysteresis plate. Furthermore, even if there is a fluctuation in the torque due to a change in diameter, it can be easily adjusted, so that a constant back tension can always be applied to the magnetic tape.

Furthermore, with the present invention, there is little mechanical contact between the inner ring and the outer ring, and the rotation of the outer ring relative to the inner ring can be stabilized without uneven rotation. Therefore, the tape drive ability of the capstan and pinch roller in a tape recorder can be accurately controlled. can be determined.

[Brief explanation of the drawing]

The drawings are for illustrating a tape drive capability determination device for a cassette tape recorder to which the present invention is applied; FIG. 1 is an exploded perspective view of this device, FIG. 2 is a schematic plan view thereof, and FIG. is a vertical side view of this cassette casing, Figure 4 is an enlarged cross-sectional view of the main parts,
FIG. 5 is a schematic plan view of the magnet, and FIG. 6 is a graph showing the relationship between wow and flutter and pack tension of the magnetic tape. In addition, in the symbols used in the drawings, 1...
...Tape cassette for wow/flatter measurement, 3...
...Supply reel, 4...Take-up reel, 8...Magnetic tape, 19...Inner ring, 19A...First inner ring, 1
9B... Second inner ring, 20... Outer ring, 21... Hysteresis plate, 22... Magnet, 26... Adjustment screw, 32... Elastic body, 41... Capstan, 4
2...Pinch roller, 43...Reproduction head.

Claims (1)

[Scope of utility model registration request] The tape has a tape on which measurement signals are recorded in advance, and both ends of the tape are fixedly wound around a supply reel and a take-up reel, and the supply reel of the pair of reels is connected to the inner ring and the tape. An outer ring is fixed at one end, and a means for fixing the inner ring to the cassette housing is provided, and a magnetic load mechanism is provided between the inner ring and the outer ring so that the outer ring is applied to the inner ring. A measurement cassette configured to be rotated against the load of the magnetic load mechanism and provided with an adjustment structure that can adjust the load to an arbitrary value, the measurement cassette being configured to rotate against the load of the magnetic load mechanism, and having an adjustment structure that allows the load to be adjusted to an arbitrary value, a capstan and a pinch roller that are pressed against the tape in order to drive the tape from the capstan to the take-up reel; a playback head;
A tape drive capability determining device comprising a capstan and a pinch roller, each comprising an electrical measuring means for electrically measuring a signal reproduced by the reproducing head.