JPS601504A - Device for measuring amount of undulation of tape in width direction - Google Patents

Abstract

PURPOSE:To make it possible to measure the amount of undulation of a tape in the direction of width readily and quickly, by providing a straight reference body, which is streched by tension in the longitudinal direction and includes a wire member, whose one end in the direction of a diameter is made to be a straight edge. CONSTITUTION:A measuring device is stretched by tension in the longitudinal direction and provided with a straight reference body 1 comprising a wire member 1A with a circular cross section, whose one end in the direction of a diameter is made to be straight edge E. Both ends of the straight reference body are stretched on supporting members 6A and 6B. One end of the body exceeding the supporting member 6A is pulled downward by the tensile strength of a weight 7. The other end exceeding the supporting member 6B is supported by a pulling spring 8 against the tensile strength of the weight 7. Thus the constant tensile strength is applied to the wire member 1A. Therefore, the amount of undulation of the tape in the direction of the width can be readily and quickly measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the amount of waviness in the width direction of a tape such as a magnetic tape using an optical dimension measuring device using a parallel scanning light beam or the like.

In general, the tape width of magnetic tapes such as video tapes and cassette tapes is 3 to 12 mm, and the tape thickness is 10 to 20 .mu.m.

The width and thickness of these tapes have a large impact on the performance of the tape, so they are strictly controlled during the manufacturing process, but deviations from the virtual center line of the tape at both ends in the width direction, that is, waviness in the width direction, Since the amount also has a great influence on the performance of the tape, it must be kept to a minimum.

However, in the past, there was no suitable testing means to easily and quickly measure the waviness of this tape in the width direction.
The amount of waviness in the width direction of the tape has been suppressed only by improving the accuracy of a rolling cutter or the like for cutting the tape. Therefore, there is a problem in that during the manufacturing process, it is not possible to measure the amount of waviness of the tape in the width direction and feed back the measurement results to the cutter.

This invention was made in view of the above-mentioned conventional problems, and it is possible to easily and quickly measure the amount of waviness of a tape in the width direction.
It is an object of the present invention to provide an apparatus for measuring the amount of waviness in the width direction of a tape, which can suppress waviness by feeding back the results to a rolling cutter or the like during the manufacturing process.

The present invention also provides an apparatus for measuring the amount of waviness in the width direction of a tape, which is capable of measuring the amount of waviness in the width direction of the tape in the manufacturing process and performing total quality control. purpose.

Another object of this invention is to provide a device for measuring the amount of waviness in the width direction of a tape, which is capable of measuring a long range of tape at once.

A further object of the present invention is to provide a device for measuring the amount of waviness in the width direction of a tape, which can be manufactured easily at low cost and can be measured with high accuracy.

The present invention is an apparatus for measuring the amount of waviness in the width direction of a tape, which includes a straight reference body including a wire stretched under tension in the longitudinal direction and having one end edge in the radial direction as a straight edge, and a tape to be measured. , its widthwise side edge is parallel to the straight edge of the straight reference body,
and a tape holding means for holding one side edge of the straight reference body in a state where it can be irradiated with light from a direction perpendicular to the tape surface, and a tape Ii1'J mark of the liquid distribution measurement tape held by this tape holding means. Optical method 1 for measuring the gap size between one side edge and the straight edge of the straight reference body
1 method measuring device, and display means for displaying the gap size corresponding to the length direction of the tape based on the output of the optical 1 method measuring device. The above object is achieved by easily and quickly measuring without contact and with high precision.

Further, in the present invention, the straight reference body includes a light blocking member having a side edge formed parallel to the widthwise side edge of the tape, and the wire rod is arranged in contact with the side edge of the light blocking member. The above object is achieved by extending the space in parallel and with a gap smaller than the maximum width of the dead zone when measured by the optical dimension measuring device.

Further, the present invention achieves the above object by constructing the light blocking member from one or more wire rods stretched parallel to the widthwise side edges of the tape.

Further, the present invention achieves the above object by using the wire rod with a circular cross section.

Further, the tape holding means includes a flat glass that holds the tape to be measured in a plane parallel to the straight edge of the straight reference body and perpendicular to the illuminating light of the optical dimension measuring device, Accordingly, the tape to be measured is maintained in a flat state to facilitate measurement, thereby achieving the above object.

This makes it possible to measure the amount of waviness in the width direction of the tape continuously or intermittently, thereby achieving the above object.

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, a straight reference body 1 made of a wire rod 1A with a circular cross section, which is stretched under tension in the longitudinal direction and has a straight edge E at one end in the radial direction, and a tape to be measured 2 are connected to each other. A tape whose direction side edge is parallel to the straight edge E of the straight reference body 1 and which holds one side edge 2A on the straight reference body 1 side in a state where it can be irradiated with light from a direction perpendicular to the tape surface. Optical dimensions for measuring the gap 1 between the holding means 3 and the one side edge 2A of the tape to be measured 2 held by the tape holding means 3 and the straight edge E of the straight reference body 1 Based on the measuring device 4 and the output of this optical dimension measuring device 4,
A display means 5 for displaying the gap size in correspondence with the tape length direction constitutes a tape widthwise waviness measuring device.

The wire 1A constituting the straight reference body 1 is, for example, JISr3!1. with a diameter of 25um±3am. It is made of a nickel oxide resistance wire, and its both ends are applied to support members 6A and 6B, respectively, as shown in FIG. The wire 11A is tensilely supported against the tensile force of the weight 7, so that a constant tensile force is applied to the wire 11A.

The tape holding means 3 holds the tape 2 to be measured in a plane parallel to the straight edge E of the straight reference body 1 and perpendicular to the light irradiated by the optical forensic measuring device 4 within its measurement range. It is equipped with a flat glass 9.

Further, the tape holding means 3 is disposed facing the flat glass 9, and holds the tape 2 to be measured at the measurement position between it and the surface of the flat glass 9, except for the one side edge 2A. It is equipped with a floating bar 10 that is inserted into the frame.

This floating bar 10, as shown in the figure,
It is pivotably supported around a swing shaft 10A, and is biased by a compression coil spring 11 so that its free end face is brought into pressure contact with the surface of the flat glass 9. The tape 2 to be measured can be inserted between the flat glass 9 and the tape 2 to be measured.

Further, the flat glass 9 is movable back and forth in the tape thickness direction, so that when the tape 2 to be measured is relatively fed in the longitudinal direction, the tape 2 to be measured 2
In addition, the tape 2 to be measured can be held between the floating bar 10 and the measuring device.

The tape holding means 3 includes a tension roller 12 that pulls the tape 2 to be measured in its longitudinal direction, whereby the tape 2 to be measured is given a constant tension in the longitudinal direction at the measurement position, and the tape 2 to be measured is This is to prevent the tape 2 from meandering and to maintain a flat state between the flat glass 9 and the floating bar 10.

Further, this tension controller 12 constitutes a feeding device capable of feeding the tape 2 to be measured continuously or intermittently in synchronization with an optical type IJ@ measuring device 4 to be described later.

As shown in FIG. 1, the optical dimension measuring instrument 4 oscillates a laser beam 14 from a laser tube 13 toward a rotating mirror 16, converts it into a scanning beam 17 by the rotating mirror 16, and converts this scanning beam 17 into a collimator. The lens 18 converts the parallel scanning light beam 20 into a parallel scanning light beam 20, which allows the remetering lens 18 and the condensing lens 2 to be converted into a parallel scanning light beam 20.
The object to be measured (in this example, the gap described later) placed between 2 is scanned at high speed, and the scanning direction of the object is determined from the length of the dark or bright area caused by the object or object at high speed. ) to measure dimensions.

The brightness and darkness of the parallel scanning light beam 20 is detected as a change in the output voltage of the light receiving element 26 located at the focal position of the condensing lens 22, and the signal from the light receiving element 26 is sent to the preamplifier 28.
The signal is input to the segment selection circuit 30, where it is amplified and sent to the segment selection circuit 30 after lc. This segment selection circuit 30 generates a voltage ■ to open the gate circuit 32 only during the time when the object to be measured (gap) is being scanned from the output voltage of the light receiving element 26, and outputs it to the gate circuit 32. It is made to look like this. Since the clock pulse CP is inputted to this gate circuit 32 from the clock pulse oscillator 34,
From the gate circuit 32, a clock pulse P corresponding to the time t corresponding to the scanning direction N method of the object to be measured is inputted to the counting circuit 36. The counting circuit 36 counts the clock pulses P and outputs a counting signal to the D/A converter 38.
/A] The inverter 38 converts the digital signal into an analog signal and outputs it to the display means 5.

As shown in FIG. 3, the display means 5 is capable of recording and displaying time on the horizontal axis and measured values on the vertical axis.

On the other hand, the rotating mirror 16 is driven by the clock pulse oscillator 34 by a synchronous motor 44 which is synchronously driven by the output of a power amplifier 42 and a synchronous sine wave oscillator 40 that generates a sine wave in synchronization with the output of the clock pulse oscillator 34. It is rotated in synchronization with the output clock pulse CP to maintain measurement accuracy.

Here, the tension controller 12 is driven via a synchronous sine wave emitter 40A and a power amplifier 42A in synchronization with the clock pulse CP in the same way as the synchronous motor 44 that drives the rotating mirror 16, and the parallel scanning light beam 2
The tape 2 to be measured is intermittently fed every predetermined number of scans.

In this embodiment, the parallel scanning light beam 20 in the optical dimension measuring device 4 scans between the straight edge E of the straight reference body 1 and one side of the tape 2 to be measured 2A, and The display means 5 displays the gap size of
I don't want to appear.

At this time, the flat glass 9 is moved up and down in synchronization with the synchronous motor 44, and the parallel scanning light beam 20 scans between one side edge 2A of the tape 2 to be measured and the straight edge 2E of the straight reference body 1. When it is moved upward,
The tape 2 to be measured is inserted between the floating bar 10 and held.

The gap between one side edge 2A of the tape to be measured 2 scanned by the parallel scanning light beam 20 and the straight edge 2E of the straight reference body 1 corresponds to the output voltage of the light receiving element 26 as the brightness of the parallel scanning light beam 20. After the change is detected, as described above, the output waveform 45A on the recording paper 45 is displayed on the display means 5 as shown in FIG. 3, with time on the horizontal axis and waviness on the vertical axis. will be displayed.

The reading of this undulating star is as shown in Figure 3.
By using the dedicated scale 46, the maximum amount of waviness Δ is determined.

If the U-ring cutter (not shown) is corrected based on this determination value, the amount of tape waviness can be suppressed.

Particularly in this embodiment, the display means 5 may display the gap N between the straight edge E and the side edge 2A based on the output of the optical dimension measuring device 4 in correspondence with the tape length direction. Therefore, the amount of waviness can be measured quantitatively and in good contrast with the tape length direction. Furthermore, even if the feeding pitch of the tape 2 to be measured by the tape holding means 3 is changed, the amount of waviness can be accurately measured by comparing it with the length d3 on the display means 5.

Here, the straight edge E applied to the reference body 1 must not be a plane in the scanning direction but a straight line in the length direction of the tape. Compared to the case where the tape 2 to be measured is constructed from a knife or the like, this embodiment can be manufactured easily and at low cost, and can be stretched over a long distance. Can be measured.

Further, since the straight reference body 1 is made of the wire 1A which is stretched by τ and given a constant tensile force, it is possible to easily obtain a straight edge E having highly accurate straightness.

Further, even if the stretched wire 1A becomes slack, the displacement due to the slack occurs in the traveling direction of the parallel scanning light beam 20 and does not displace in the scanning direction, so that measurement accuracy is not affected.

Therefore, the tensile force applied to the wire @1A can be covered to a small extent, and even if the wire is used, no constriction will occur in IIJ due to the tensile force, and there will be measurement errors due to the displacement of the wire diameter. In addition to being able to prevent this, the configuration and adjustment of the device can be made easy.

Here, when using the wire tJ I A as the straight edge E, the maximum measurement error is 1 of the diameter tolerance of the wire.
/2, and when a standard wire rod is used as the straight reference body as mentioned above, the tolerance of the diameter is, for example, 2
In the case of 5 μm, the error is ±3 μnl, so the measurement error is less than half that, 1.5 μm. However, in reality, the variation in the diameter in the longitudinal direction of the wire is very small due to its manufacturing, and for example,
In the case of a standard product of 5 μm±3 μm, the maximum measurement error is 1.5 μm according to the standard, but in practice it is easy to say that it is about 1 μm.

Furthermore, in general, it is relatively easy to obtain a wire rod with a precision higher than that of standard products, for example, a wire rod with a diameter smaller than 25 μm and a tolerance smaller than ±3 μm; therefore,
Maximum measurement error: ±1 μm or less Next, a second embodiment of the present invention shown in FIG. 4 will be described.

In this second embodiment, the straight reference body 1 is provided with a light shielding member 1B that is formed parallel to one side edge 2A in the width direction of the tape to be measured 2 and that extends to the right side edge.
A is parallel to the side edge of the light blocking member 1B, and
A gap S smaller than the maximum width of the dead zone during measurement by the optical usage measuring device 4 is set.

That is, in this embodiment, for example, when the beam diameter of the parallel scanning light beam 20 is 80 μm, it may be difficult to clearly capture the brightness and darkness due to the wire rod 1A having a diameter of 25 μm, which is different from the first embodiment. In this case, for example, the gap S is set to 5
This method takes advantage of the fact that when the light shielding member 1B is arranged with respect to the -C wire 1A with a thickness of 0 to 80 μm, the parallel scanning light beam 20 is blocked by the wire 1A, and the IC portion can be clearly detected as a dark portion.

In this case, the straightness of the side edge of the light blocking member 1B facing the line 141A only needs to have an error of 80 μm at the maximum in the width direction, so it can be manufactured very easily.

Next, a third embodiment of the present invention shown in FIG. 5 will be explained.

In this third embodiment, the light shielding member 1B is composed of one or more wire rods 1C stretched parallel to the widthwise side edge 2A of the tape 2 to be measured.

In the case of this embodiment, one or more wire rods 1C constituting the light blocking member 1B are attached to the support member 6A16B.
i! As with the shrine, the tension is parallel and with a certain gap.
This has the advantage that it can be manufactured easily and at low cost, and can also be applied when measuring the tape 2 to be measured over a long span.

Note that the optical dimension measuring device 4 in the above embodiment converts the laser beam 14 from the laser tube 13 into a parallel scanning light beam 2.
However, the present invention is not limited to this, and it is also possible to continuously irradiate the gap between the straight edge E and the side edge 2A. good.

Further, in the above embodiment, the tape to be measured 2 is intermittently fed by the tension controller 12 in synchronization with the optical q-method measuring device 4, but the present invention is not limited to this. Alternatively, the tape 2 to be measured may be fed continuously.

In this case, it is preferable that the continuous light from the optical dimension measuring device 4 illuminates the gap between the straight edge and the side edge 2A in the form of a slit.

Furthermore, the above embodiment has a straight edge E and a side edge 2.
Parallel scanning light beam 201 after scanning the gap between A and
Fi? The entire beam passes through the flat glass 9 and later reaches the condensing lens 22.
For example, as shown in FIG. 6, a slit 9A may be provided in the flat glass 9 and the parallel scanning light beam 20 may be arranged to pass through the slit 9A.

In this case, there is no influence from dirt on the flat glass 9 or foreign matter adhering to the flat glass 9.
You can measure more accurately.

Further, in the above embodiment, the optical dimension measuring device 4 is fixed and the tape to be measured 2 is measured.
Measurement may be performed while relatively moving the measuring device 4 side in the longitudinal direction of the tape.

In this case, tape feeding by the tape holding means 3 may be stopped, or measurements may be made while feeding.

However, if the tape feeding is stopped and measured, the amount of waviness can be measured more accurately since there is no error caused by the deflection of the tape holding means 3 in the tape width direction when the tape is fed. When measuring while stopping tape feeding, the tape to be measured 2 is intermittently measured in batches at fixed length intervals. In this case, the tape holding means 3 is
At all or multiple locations in the measurement length range of the tape to be measured 2,
It is configured to hold the tape 2 to be measured.

Furthermore, when moving the optical J method measuring device 4 in the tape length direction as described above, the present invention allows the straight edge E of the straight reference body 1 to be easily and precisely measured at a low cost. , there is an advantage that it can be configured to be long along the tape 2 to be measured.

Further, in the embodiment described above, a tension controller 12 is used to apply a tensile force of -C to the tape 2 to be measured at the measurement position, but this is because the tension controller 12 applies a tensile force of -C to the tape 2 to be measured at the measurement position. Measuring tape 2
This is not necessarily necessary as long as the tape 2 to be measured can be maintained in a flat state by being held between the two.

Further, in the above embodiment, the display means 5 is an analog recorder, which is capable of recording or observing the amount of waviness in the -C width direction corresponding to the length of the tape 2 to be measured. Therefore, for example, it may be a CRT (can-doray tube), a printer, or the like.

Since the present invention is configured as described above, the amount of waviness in the width direction of a tape such as a magnetic tape can be measured continuously over a long range without contact, quickly and easily. It is possible to easily modify the rolling cutter etc. that cuts in the direction, the amount of waviness in the width direction of the chi 1 can be suppressed, and the device can be configured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view including a partial block diagram showing an embodiment of the device for measuring the amount of waviness in the width direction of a tape according to the present invention; FIG. 2 is an enlarged sectional view taken along line I-I in FIG. 3 is a plan view showing the main parts of the same embodiment, FIG. 4 is a plan view showing the recording results by the display means in the same embodiment, and FIGS. 5 and 16 are the $2 and third embodiments of the present invention. FIG. 7 is a sectional view showing the main part of the example, and FIG. 7 is a plan view showing the flat glass portion according to the fourth example. DESCRIPTION OF SYMBOLS 1... Straight reference body, IA, IC... Wire rod, 1B... Light shielding part shrine, 2... Tape to be measured, 2A... One side edge, 3... Tape holding means , 4... Optical dimension measuring device, 5... Indication means, 7... Weight, 8... Tension spring. 20...Parallel scanning light beam, E...Straight edge, S...Gap. Agent Keisuke Matsuyama (1 idiot) Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (5)

[Claims] (1) A straight reference body including a wire stretched under tension in the longitudinal direction and having a straight edge at one end in the radial direction, and a fixed tape, the edge of which in the width direction is the straight reference. a tape holding means that is parallel to the straight edge of the body and holds one side edge on the straight reference body side in a state where light can be irradiated from a direction perpendicular to the tape surface; An optical dimension measuring device that measures the gap between the straight edge of the one side edge of the tape to be measured and the straight edge of the reference body, and based on the output of this optical dimension measuring device, A measuring device for measuring the amount of waviness in the width direction of a tape, correspondingly comprising: display means for displaying the gap size. (2) The straight reference body includes a light-cutting part having a side edge formed parallel to one side edge in the width direction of the tape to be measured, and the wire rod is connected to the side edge of the light-blocking member. The width direction of the tape according to claim 1, which is stretched parallel to the side edges and with a gap smaller than the maximum width of the dead zone when measured by the optical dimension measuring device. Waviness measuring device. (3) The light blocking member is one or more wire rods stretched parallel to the widthwise side edge of the tape to be measured. Device for measuring the amount of waviness in the width direction of tape. (4) The device for measuring the amount of waviness in the width direction of a tape according to claim 1, 2, or 3, wherein the wire has a circular cross section. (5) The tape holding means holds the tape to be measured parallel to the straight edge of the straight reference body, and
Widthwise waviness of the tape according to any one of claims 1 to 4, characterized in that the tape is provided with a flat glass held in a plane perpendicular to the irradiation light from the optical dimension measuring device. Quantity measuring device.