JP3306966B2 - Guide roller runout measuring method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring run-out of a guide roller used for transporting a magnetic tape in a magnetic recording / reproducing apparatus such as a video tape recorder and a DAT.

[0002]

2. Description of the Related Art Conventionally, in a magnetic recording / reproducing apparatus such as a video tape recorder or a DAT, a tape guide shown in FIG. 7 is provided for guiding a magnetic tape. In this tape guide, guide rollers 4 and 6 inclined at a specific angle are erected on a base 2 fixed to a frame side of a magnetic recording / reproducing apparatus. 8 and transported in a predetermined direction.

As shown in FIG. 8, the guide roller 4 has an upper flange 12 attached to the top of the shaft 10 and a lower flange 14 attached to the middle of the shaft 10, and the upper portion of the shaft 10 between the upper flange 12 and the lower flange 14. A cylindrical roller 8 is attached via a bearing 16 made of synthetic resin or the like. The roller 8 may be formed of a synthetic resin in some cases. The lower flange 14 is recessed toward the roller 8, and a screw 20 as a means for fixing to the base 2 is attached to the shaft 10 in the recess 18.

[0004]

However, such a guide roller 4 is a means for supporting the stable running of the magnetic tape. In order to realize the smooth running of the magnetic tape, there is no need for rotational runout. Since it is necessary, if the rotational runout exceeds the allowable limit, it must be removed from the product as a defective product.

Conventionally, the inspection of the rotational runout is performed manually, and the guide roller is fixed to the measuring jig, the runout of the rotary gauge is visually read, and the magnitude of the runout is used to determine whether the product is good or defective. After the judgment, a single worker performed each process of sorting non-defective products and non-defective products. Such work requires a large number of man-hours and poor work efficiency, and there is a possibility that an error in the judgment and sorting work may affect the product quality.

[0006] This kind of run-out of the guide roller is caused by deterioration of the dimensional accuracy of the rotating member of the guide roller 4 and foreign matters such as burrs. Since the dimensional accuracy of the rotating member depends on the processing accuracy and the like, it cannot be eliminated at the product stage, but foreign substances such as burrs can be removed at the final processing or shipping stage of the product.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a guide roller runout measuring method and apparatus for improving the guide roller rotational runout measurement accuracy and improving the measurement efficiency.

[0008]

Means for Solving the Problems] guide roller method runout measurements of the present invention, as illustrated in Figure 1, the shaft
(10) with upper flange (12) and lower flange (14)
And between the upper and lower flanges.
Can rotate a cylindrical roller (8) that guides the magnetic tape
A guide roller runout measurement method provided in the
Hold the shaft and apply a constant tension to the rollers
Press the rotating belt (52) to apply rotation
A measuring element (for example,
The probes 26 and 28) are applied and the displacement of the probe is
Signal level and measure the run-out of the guide roller.
Is characterized. Also, the guide roller of the present invention
As shown in FIG.
(10) with upper flange (12) and lower flange (14)
And between the upper and lower flanges.
Can rotate a cylindrical roller (8) that guides the magnetic tape
A guide roller runout measurement method provided in the
Hold the shaft and apply a constant tension to the rollers
Press the rotating belt (52) to apply rotation
And one or both of the upper and lower sides of the rotating roller
A measuring element (for example, measuring elements 26 and 28) is applied to one of the roller surfaces, and the displacement of the measuring element is converted into an electric signal level,
The rotational fluctuation of the guide roller is measured based on the level difference.

The guide roller runout measuring apparatus according to the present invention is mounted on a shaft (10) as shown in FIG.
Attach the flange (12) and the lower flange (14)
With magnetic tape between the upper and lower flanges
With a rotatable cylindrical roller (8) for guiding
An apparatus for measuring runout of an idler roller, wherein the shaft is held.
Holding means (chuck device 22) to hold a certain tension
A rotating belt (52).
A rotation applying means (rotation applying mechanism 24) for applying rotation by pressing against the roller, and contacting the roller surface of the rotating roller;
A measuring element (26, 28) which is touch detecting the displacement, and further comprising a converting means for converting the displacement of the <br/> feeler to the level of the electric signal (converter 36, 38) I do.

[0010]

[Function] Attach upper and lower flanges to shaft
And a magnetic tape between the upper and lower flanges.
Guide with rotatable cylindrical rollers for guiding
In Dorora, the deflection of Russia over La, a eccentric rotation of the peripheral surface of the roller with respect to the center of rotation, in particular, the difference in deflection of the upper side and lower side affects stable running of the magnetic tape. Therefore, according to the guide roller runout measuring method of the present invention, the guide roller is actually rotated, and the upper side and the lower side of the roller are rotated.
By contacting the measuring element in one or both of the roller surface of the side, and detects the rotation shake as the linear direction of the displacement, and detects the size of the deflection at the level of the electrical signal, moth
The rotational runout of the id roller can be measured. Then, the rotational runout of the guide roller is measured from the level difference .
You can also.

In the guide roller runout measuring apparatus, a rotating belt is applied to the roller surface of the roller to forcibly rotate the roller . The roller surface of the rotating roller devoted tracing stylus, the rotation of the roller deflection gives a linear direction mechanical displacement measuring element. This displacement is applied to the conversion means and converted into an electric signal, and the magnitude thereof appears as a level change of the electric signal. Therefore, the run-out of the guide roller can be measured electrically by realizing the same state as in actual operation.
can do.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of a guide roller runout measuring method and apparatus according to the present invention. The guide roller 4 to be inspected is held upright by the chuck device 22 as a holding means with its shaft 10 set. That is, the guide roller 4 is set such that the roller 8 is rotatable, and the roller 8 is given a constant rotation in the direction of the arrow N or in the opposite direction by the rotation applying mechanism 24, for example.

The roller surface of the roller 8 on the side of the upper flange 12 and the lower flange 14, which is the portion where the rotational runout is the largest, is set as the measured site as the site where the rotational runout of the guide roller 4 is measured. The first probe 26 is located at the upper flange 12 side, and the second probe is located at the lower flange 14 side.
Are provided, and the tips of the probes 26 and 28 are in contact with the roller surfaces of the respective portions. Probes 26, 28
Has a spherical shape to prevent wear.

The measuring elements 26 and 28 are fixed to linear supporting portions 30 and 32. In this embodiment, the measuring elements 26 and 28 are fixed at fixed angles by fixing pins 34. That is, the rotational runout of the guide roller 4 is converted into linear displacements A and B by the tracing styluses 26 and 28, and the support portions 30 and 32 are moved in the horizontal direction.

Converters 36 and 38 are provided as means for converting the mechanical displacement of the supports 30 and 32 into an electric signal. The converter 36 includes a coil 40 and a converter 38.
A coil 45 is inserted into the coil 40. An iron core 45 that moves forward and backward by the support 30 is inserted into the coil 40, and an iron core 46 that moves forward and backward by the support 32 is inserted into the coil 42. The iron cores 45 and 46 may be configured with magnets.

Each of the coils 40 and 42 has a guide roller 4
A processing device 44 is connected as a measuring / judging means for measuring the presence or absence and the degree of the rotational shake from the level of the electric signal obtained by the rotational shake and the difference between the two, and judging the suitability of the guide roller 4. The processing device 44 can be constituted by an analog measurement processing device or a digital processing device such as a microcomputer.

A description will be given of a runout measuring method using this runout measuring apparatus. The guide roller 4 to be runout measured is fixed to the chuck device 22 with its shaft 10.
This fixing is performed at a predetermined position by using a transfer means such as a transfer robot. Next, the roller 8 is rotated at a constant speed through the rotation applying mechanism 24, and the tips of the measuring elements 26 and 28 are brought into contact with the roller surfaces. The rotational runout of the roller 8 causes a mechanical displacement of the tracing styluses 26 and 28, and moves right and left as indicated by arrows A and B. This mechanical displacement is caused by the support parts 30, 32
Causes a mechanical displacement of the iron cores 45, 46, that is, a change in the insertion position of the coils 40, 42, and this movement is applied to the processing device 44 as a change in the electric signal.

Assuming that a signal generated on the converter 36 side is V ₁ and a signal generated on the converter 38 side is V ₂ , each signal V ₁ ,
V ₂ is generated in the synchronized state, when there is a rotational shake appears as the level varies according to its size position. In particular, in the case of eccentric rotation, the vibration regularly occurs as a level change, and the level appears in V ₁ and V ₂ . By taking these level differences, the degree of rotational runout can be measured, and when the level exceeds an allowable range, the guide roller can be removed as a defective product.

FIGS. 2 to 5 show a specific embodiment of the shake measuring device. This shake measurement device includes:
The chuck device 22 is provided with a rotation imparting mechanism 24 for forcibly rotating the guide roller 4. This rotation imparting mechanism 24 has a driving pulley 47 and driven pulleys 48 and 50 installed at a vertex position of a triangle.
A rubber belt 52 is wound around 7, 48 and 50 while applying a constant tension. In this case, the driving pulley 46
A rotating shaft of a motor 54 serving as a rotation driving means is connected via a gear mechanism or the like, so that constant rotation is given.

Each pulley 47, 48, 50 is connected to the frame 5
The slide plate 58 is disposed on a movable slide plate 58 provided on the guide roller 6, and the slide plate 58 advances toward the guide roller 4 through the pressurizing means as shown by an arrow C at the time of shake measurement, and is retracted during standby. Can be The guide roller 4 is provided on the frame 56 supporting the slide plate 58.
As a measuring mechanism for measuring the vibration of the upper and lower parts,
28 are installed.

Therefore, when measuring the rotational runout, FIG.
(A), the rotating rubber belt 52 is pressed against the surface of the roller 8 of the guide roller 4, whereby the guide roller 4 is forcibly rotated in one direction. Then, as a result of the tracing styluses 26 and 28 being brought into contact with predetermined measurement sites on the surface of the roller 8 of the rotating guide roller 4, the rotational runout of the guide roller 4 is measured.

FIG. 6 shows an example of the measurement result. In FIG. 6, V ₁ is a probe 2 on the upper flange 12 side.
The detected signals with a 6, V ₂ is a signal detected with a lower flange 14 side of the probe 28. The horizontal axis is time, and T is a waveform of one rotation of the guide roller 4. The horizontal axis represents the amplitude of the run-out, and from the magnitude of the amplitude, it can be seen from this measurement result that the run-out of the upper flange 12 is large. The width of the scale is constant, and the magnitude of the shake can be read from the scale. From this result, for example, it is possible to estimate the running speed of the magnetic tape and the magnitude of the running blur. From this measurement result, the suitability of the guide roller 4 can be determined based on the amplitude exceeding the allowable range.

In the embodiment, the pair of tracing styluses 26, 2
Although the run-out of the roller surfaces on the upper and lower sides of the guide roller 8 is measured at the same time by using the reference numeral 8, the run-out of each part may be measured by using a single measuring element. The deflection measurement at three or more locations may be performed using a probe.

[0025]

As described above, according to the guide roller runout measuring method of the present invention, the rotational runout can be electrically measured from the actual operation of the guide roller, and the measurement accuracy can be improved and the measurement can be performed. Efficiency can be increased.

According to the guide roller runout measuring apparatus of the present invention, it is possible to measure rotational runout by incorporating the guide roller into a production and inspection process line.
Errors due to manual work can be prevented, and automation and measurement accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a guide roller runout measuring method and apparatus according to the present invention.

FIG. 2 is a plan view showing a specific embodiment of a guide roller runout measuring apparatus according to the present invention.

FIG. 3 is a front view of the guide roller runout measuring device shown in FIG. 2;

FIG. 4 is a side view of the guide roller runout measuring apparatus shown in FIG. 2;

FIG. 5 is a diagram showing rotation of a guide roller and measurement of run-out by the guide roller run-out measuring device shown in FIG. 2;

FIG. 6 is a diagram showing a measurement result of a run-out of a guide roller.

FIG. 7 is a perspective view showing a tape guide.

FIG. 8 is a longitudinal sectional view showing a guide roller.

[Explanation of symbols]

 4 Guide roller 24 Rotation imparting mechanism (rotation imparting means) 26, 28 Measuring element 36, 38 Converter (converting means)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-117406 (JP, A) JP-A-59-38959 (JP, A) JP-A-3-108152 (JP, A) 173013 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 5/00-5/30 G01B 21/00-21/32 G11B 15/00 G11B 15/60

Claims (3)

(57) [Claims] An upper flange and a lower flange are provided on a shaft.
Attach, and between the upper and lower flanges
A rotatable cylindrical roller for guiding the magnetic tape
A method for measuring run-out of a guide roller , comprising:
Press the belt that rotates with tension to apply rotation,
A probe is applied to the roller surface of the rotating roller,
Converts the displacement of the fixed element to the level of an electric signal,
Guide row, which measures rotation runout of the roller
LA deflection measurement method. 2. A shaft having an upper flange and a lower flange.
Attach, and between the upper and lower flanges
A rotatable cylindrical roller for guiding the magnetic tape
A method for measuring run-out of a guide roller , comprising:
Pressing the belt that rotates with tension to impart rotation,
One or both of the upper and lower sides of the rotating roller
A method for measuring run-out of a guide roller, comprising: applying a stylus to a roller surface; converting a displacement of the stylus into an electric signal level; and measuring a rotational run-out of the guide roller based on the level difference. 3. An upper flange and a lower flange on a shaft.
Attach, and between the upper and lower flanges
A rotatable cylindrical roller for guiding the magnetic tape
A guide roller runout measuring device, comprising: a holding means for holding the shaft; and a belt rotating with a constant tension.
Rotation applying means for applying rotation by pressing against the roller, and detecting displacement by contacting the roller surface of the rotating roller
Measuring element and a conversion means for converting the displacement of the measuring element to the level of the electrical signal, deflection measuring device guide rollers, characterized in that it comprises a for.