JP2003341942A - Device for evaluating winding form of belt-like material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for evaluating a winding form of a belt-like material capable of evaluating the winding form of belt-like material wound on a hub, in even a reel having a flange formed on the hub, and increasing line speed in the evaluating process. <P>SOLUTION: The device 1 for evaluating the winding form is one for evaluating the winding form of the belt-like material such as a film T wound on the hub H. The device 1 is provided with a light projecting device 12 for irradiating at least a part of light passing in the vicinity of the hub H along a winding surface 2 of the belt-like material such as the film T and a light receiving device 13 for receiving light from the light projecting device 12. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is wound around a winding core.
Evaluate the appearance of strips such as film tape and web
The present invention relates to a device for evaluating a rolled form of a belt-like object. [0002] Generally, paper, plastic film or
The tape, which is a strip like metal foil, is wound around the core
Shipped as shipped. In this way, it is wound on the core
The tape will not look good unless it is rolled up.
Not only will it be formed at the edge of the tape when dropped
Because the tape protruding from the winding surface may be damaged,
The evaluation about this winding form has been performed conventionally. As a conventional apparatus for evaluating the winding shape, a special device is used.
There is what is disclosed in Japanese Utility Model Publication No. 2000-337827.
The With this device, printing wound on a hub without flanges
Irradiate light on the winding surface of film, etc.
The image of the reflected light is image processed to evaluate its winding shape.
The In addition, the winding state of a conventional magnetic tape is evaluated.
An apparatus disclosed in Japanese Patent Laid-Open No. 10-269567 is disclosed.
There is something to be done. This device is suitable for hubs without flanges.
It is installed near the winding surface of the wound magnetic tape.
Measuring air pressure by sucking air along the surface.
The That is, in this device, for example, the magnetic force from the winding surface
If the tape is protruding, the magnetic tape
Since it is resistance to flow, the measured pressure is low.
You can see that the magnetic tape protrudes from the winding surface
It has become. [0005] However, the former
In such a device, if the flange formed on the core is transparent,
In the case of
If it is transparent, the roll cannot be evaluated
It was. On the other hand, in the latter type of device, the winding surface of the magnetic tape
Since it is necessary to install in the vicinity, a flange is provided on the core.
If this is the case, evaluate the appearance of the magnetic tape.
I couldn't. In this device, the measurement device
Time to move the device closer to or away from the magnetic tape, or air
It took a long time for the pressure to stabilize after
Therefore, the line speed in the winding evaluation process is slow.
It was. Accordingly, an object of the present invention is to provide a flange on a winding core.
Even if the reel is formed, the band wound around its core
In addition to being able to evaluate the winding shape of the object,
Winding of strips that can increase the line speed
It is to provide a figure evaluation apparatus. Means for Solving the Problems A belt-like shape that has solved the problems described above.
A device for evaluating the appearance of a wound product is a device for winding a strip wound around a core.
An apparatus for evaluating the appearance, at least a part of the core
Throw light that shines along the winding surface of the strip.
An optical device and a light receiver for receiving light from the projector
It is characterized by that. Here, the “winding surface” is wound around the core.
It refers to the surface formed at the end in the width direction of the strip,
In particular, assuming that the strip is ideally wound around the core.
This refers to the winding surface that becomes a preset reference value. In accordance with the present invention, for example, an opaque furan
Evaluate the winding shape of the belt wound around the winding core
Irradiate light from the projector along the winding surface of the belt
The light passes between the winding surface and the flange
To reach. Here, a part of this light is near the core.
When the belt-like object protrudes from the winding surface
Amount of light that is reliably blocked by the emitted belt and received by the receiver
Is less than the normal state. Therefore, strips are
When wound around a core with a transparent flange
It is also possible to reliably evaluate the winding appearance. The present invention also provides a belt-like object wound around a winding core.
A device for evaluating the winding shape of the belt-shaped object
Projecting from the winding surface and a projector that irradiates light along
Receiving light from the projector reflected by the belt-like object.
And a position received by the light receiver, light quantity or
Measure the time for light to reach from the projector to the receiver
Recognize the position of the band projecting from the winding surface
It may be characterized by. According to such a configuration, for example, a franc
Evaluate the winding shape of the belt wound around the winding core
Irradiate light from the projector along the winding surface of the belt
This light passes between the winding surface and the flange, and the winding surface
When the strip protrudes from the
And reach the receiver. And with this receiver
Position, amount of light or time required from light emission to light reception
Measure and based on this measured value, for example, a projector and a winding surface
This distance is calculated by calculating the distance from the band that protrudes from
The position of the object is recognized. Furthermore, the present invention provides a belt-like shape wound around a core.
An apparatus for evaluating the winding shape of an object, the winding of the band-like object
A projector that irradiates light along the surface, and light by this projector
Focus on the band that protrudes from the winding surface irradiated with
An image pickup device that picks up the image and
Projects from the winding surface based on the focal length when the
It is characterized by recognizing the position of the strip.
May be. According to such a configuration, for example, a franc
Evaluate the winding shape of the belt wound around the winding core
Irradiate light from the projector along the winding surface of the belt
This light passes between the winding surface and the flange, and the winding surface
When the strip protrudes from the
It is dripping. The imaging device is then applied to the band that has been exposed to this light.
Set the focus of the device and take an image based on the focal length
Calculate the distance between the device and the strip protruding from the winding surface.
Thus, the position of the strip is recognized. The present invention also provides a belt-like object wound around a winding core.
A device for evaluating the winding shape of the light, which is directed toward the core
A projector that irradiates the belt along the winding surface of the strip,
Reflected by a winding core or a band projecting from the winding surface
An imaging device for imaging light from the projector, and
Based on the image captured by the imaging device,
It may be characterized by evaluating. According to such a configuration, for example, a franc
Evaluate the winding shape of the belt wound around the winding core
If the roll is in a regular state,
Irradiate light along the winding surface of the strip,
The core is irradiated between the winding surface and the flange. So
The light reflected by the core is caused by the roughness of the surface of the core.
Taken by the imaging device as light that is diffused and has a large width.
Imaged. On the other hand, when the strip protrudes from the winding surface
Is hit by the projected band of light emitted from the projector
It will be. Here, this strip is, for example, a magnetic tape
If this is the case, the surface is mirror-like.
The light reflected by the object is not diffused and has a small width.
The image is picked up by the image pickup device. Therefore, winding core and strip
By making the surface roughness of the belt different,
The appearance can be evaluated. In addition, table of winding core and band
The surface roughness is not necessarily different. For example these
Even if the surface roughness is almost the same, the imaging device is irradiated.
Depending on the direction of light, the light from the core or the protruding band
It can be determined whether it is light. DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] The drawings are as follows.
Refer to the belt-shaped object winding shape evaluation apparatus according to the present invention.
A first embodiment will be described. This embodiment is
As shown in FIG. 1, upper flanges are provided at both ends of the hub (core) H.
In the reel R on which F1 and the lower flange F2 are formed,
Rolled form of film (band) T wound around hub H
The present invention is applied to an apparatus for evaluating the above. As shown in FIG. 1, the winding according to the present embodiment.
The appearance evaluation apparatus 1 includes an apparatus main body 11, a projector 12, and a light reception
Mainly equipped with a vessel 13. The device main body 11 is a flat surface.
A base 11a having a substantially rectangular view and a reel R are installed.
A reel installation unit 11b and a projector 12 are installed.
For installing a projector installation portion 11c and a light receiver 13
And a light receiving device installation portion 11d. The reel installation portion 11b is an abbreviation of the base portion 11a.
It is formed so as to protrude upward in the center. Reel R
On the lower surface of the plate, there is a ferrule (not shown) for receiving a rotational driving force.
A chair gear is formed and the upper surface of the reel installation portion 11b
The face that meshes with the face gear of this reel R
A gear 11e is formed. Face gear 11
Inside e, suction for fixing reel R by suction
A hole 11f is formed. That is, this suction hole 11
A suction device (not shown) provided below f
By pulling, the reel R is placed on the upper surface of the reel installation portion 11b.
It is detachably fixed. The projector installation portion 11c is a part of the base portion 11a.
It is formed to protrude upward at one corner, and on the upper surface
The projector 12 is fixed. In addition, the receiver installation unit 11
d is the same as that of the projector installation portion 11c.
It is formed to protrude upward at one corner and its upper surface
The light receiver 13 is fixed to. And this projector setup
The placement unit 11c and the receiver installation unit 11d are approximately installed on a reel.
More precisely, so as to face each other across the portion 11b
A position shifted by a predetermined distance from the center of the installation section 11b.
Are formed opposite to each other. Also, this projector installation part
11c and the receiver installation part 11d are connected to the reel installation part 11b.
It is formed higher than the upper surface by a predetermined distance. Snow
That is, when the reel R is installed on the upper surface of the reel installation portion 11b
The light emitted from the projector 12 is
These installation portions 11b are arranged along the winding surface 2 of the rum T.
To 11d are formed. The light projector 12 emits light toward the light receiver 13.
As shown in FIG.
A series of widths that pass through the outermost layer of film T
Irradiating line light. The projector 12 is shown in FIG.
As shown, the reel R installed in the reel installation unit 11b.
From the winding surface 2 formed by the film T inside the upper flange F
Light that is so high that it passes through a range of 1 is applied to the winding surface 2
Irradiating along. The projector 12 has an upper flange.
Of the gap between F1 and winding surface 2, at least near the hub H
As long as the light is radiated toward the part, the curtain is as shown in Fig. 1.
Even light that irradiates light in a spot shape without irradiating light
Good. The light receiver 13 receives light from the projector 12.
It detects the amount of light received and
Is output to a control device (not shown). And this
Projecting from the winding surface 2 based on the light quantity by the control device
The position of the film T ′ to be recognized is recognized. Next, the winding form by this winding form evaluation apparatus 1
The evaluation method will be described. First, as shown in FIG.
The film T was wound around the lower flange F2 side.
The reel R is installed in the reel installation unit 11b. And figure
As shown in FIG. 3, light is projected from the projector 12 along the winding surface 2.
When irradiated, this light is between the winding surface 2 and the upper flange F1.
Passes through to the light receiver 13. At this time, winding surface 2
If the film T 'protrudes from the
A part of the light is blocked by Lum T ′ and received by the light receiver 13.
The amount of is reduced compared to the normal state. And this reception
When the signal detected by the optical device 13 is output to the control device,
Film T ′ protruding from winding surface 2 based on this signal
Is calculated by the control device. Where the amount of light and
The relationship of the protruding film T ′ is as shown in FIG.
The position of the protruding film T 'is the radial direction from the hub H
The farther away, the more light is received by the light receiver 13.
It is in a relationship of fewer. Therefore, the light receiver 13
The position of the film T ′ is controlled based on the amount of light received by
It is calculated by the position. Only near the hub H
If a spot-like light is irradiated, the protruding
If there is a film T ', this film T'
The receiver 13 receives weak light or
Does not receive light. Therefore, the amount of light received by the light receiver 13
The presence or absence of protruding film T 'is detected based on
It becomes. According to the above, in the first embodiment,
The following effects can be obtained. According to this embodiment
For example, a reel R having flanges F1 and F2 formed on a hub H.
Even so, the upper flange F1 and the winding surface of the film T
2 so that it can be irradiated with light.
The roll of film T can be evaluated. Also evaluate the winding appearance
As it is only necessary to irradiate with light,
Move the device or wait for the pressure to stabilize
No need to increase line speed in the evaluation process
I can make it. [Second Embodiment] The present invention will be described below.
Regarding the second embodiment of the device for evaluating the rolled form of a strip
I will explain. In this embodiment, as shown in FIG.
Magnetic tape cartridge having two reels R of the embodiment
Since it is a device that evaluates the appearance of the wedge C, the first implementation
Constituent elements related to the form reel R have the same reference numerals.
A description thereof will be omitted. As shown in FIG.
Hub light along winding surface 2 of magnetic tape MT
Projector 31 for irradiating H and hub H or winding surface
Projector 3 reflected by magnetic tape MT ′ protruding from 2
1 is mainly provided with a light receiver 32 that receives light from 1.
The projector 31 is provided from the outside of the magnetic tape cartridge C.
This magnetic table is used to irradiate light toward the hub H.
With the lid L of the cartridge C opened
It is installed at a position where the hub H can be seen. That is, this
The light emitted from the projector 31 is the magnetic tape on the reel R.
Passes through the gap C1 for pulling out the MT to the outside, and outside
Winding of magnetic tape MT and magnetic tape MT pulled out
Proceeding towards the hub H passing over the upper side of the surface 2
become. The light receiver 32 is a magnetic tape cartridge C.
Tape protruding from the hub H or winding surface 2 inside
To receive light from the projector 31 reflected by MT ′
The lid L of this magnetic tape cartridge C was opened
Installed in a position where the hub H can be seen
The That is, magnetism protruding from the hub H or the winding surface 2
The light reflected by the tape MT ′ is reflected on the magnetic tape cartridge.
Pull out to the winding surface 2 and the outside through the gap C1
The light receiver 32 passes through the upper side of the magnetic tape MT.
Will head towards. The light receiver 32 is
From the light reflected from the hub H, the top of the magnetic tape MT
Reflected from the magnetic tape MT 'protruding at the outer layer position
It has a predetermined width so that even incoming light can be received. In addition, the light receiver 32 receives the level of the received light.
And output the signal to a control device (not shown).
ing. Then, this control device determines the position of the light.
Therefore, the distance to the magnetic tape MT ′ protruding from the winding surface 2
The distance is calculated and the position is recognized. Next, the winding form by this winding form evaluation apparatus 3
The evaluation method will be described. First, as shown in FIG.
Inspection of the magnetic tape cartridge C with the winding form evaluation device 3
Is set at a predetermined position. And this time winding
If the magnetic tape MT ′ does not protrude from the surface 2, the light is projected.
When light is irradiated from the vessel 31 along the winding surface 2, this light
Is reflected by the hub H and received at a predetermined position of the light receiver 32.
The On the other hand, the magnetic tape MT ′ protrudes from the winding surface 2
If this is the case, as shown in FIG.
The light irradiated toward the H
Reflected by MT ′ and received at a predetermined position of the light receiver 32
The The position of the light received by the light receiver 32 is a signal.
Is output to the control device as
Controls distance from magnetic surface MT 'protruding from surface 2
It is calculated by the device and its position is recognized. Here, the position of the light and the protruding magnetic table are shown.
In relation to the MT ', the position of the magnetic tape MT' is the outermost
The closer the layer is, the position of the light reflected by the hub H
It is in a relation that it is detected at a position far from the center. That
Therefore, based on the position of the light detected by the light receiver 32, the magnetic tape
The position of the MT MT ′ is calculated by the control device. This
The result calculated by the control device as shown in FIG.
It is fu. In the graph of FIG.
The calculated result is converted to the distance from the hub H by the control device.
And the flange F1 etc. are removed on the horizontal axis.
The distance from the hub H to the magnetic tape MT 'protruding
This shows the results measured with the tool. From this, the receiver
It can be seen that the value detected in 32 and the actual position substantially match.
Therefore, the magnetic field protruding reliably by the winding form evaluation device 3
The position of the air tape MT ′ can be known. Also this
Light is reflected from the surface of the hub H by the roll evaluation device 3.
If OK, otherwise NG
OK products and NG products can be distinguished.
The It should be noted that the light is projected by the projector 31 regardless of the position of the light.
Until the light is projected and this pulse light is received by the light receiver 32
Hub H or protruding magnetic tape M
The position of T ′ may be measured. According to the above, in the second embodiment,
The following effects can be obtained. According to this embodiment
For example, the magnetism which protruded from the winding surface 2 from the position of the reflected light
Since the position of the tape MT ′ can be recognized,
The diameter of the irradiated light can be made small. That
Magnetic tape cartridge having two reels R
Magnetic tape cartridge from narrow gap C1 formed in C
Without disassembling the di-C, you can evaluate its winding shape
The [Third Embodiment] In the following, the present invention is described.
Regarding the third embodiment of the belt-shaped object winding shape evaluation apparatus
I will explain. In this embodiment, as shown in FIG.
Of Magnetic Tape Cartridge C in Embodiment
Therefore, the magnetic tape of the second embodiment is used.
The same reference numerals are used for components relating to the cartridge C.
The description is omitted. As shown in FIG.
The light traveling toward the hub H along the winding surface 2 of the magnetic tape MT
Illumination device (projector) 41 to irradiate and hub H or winding
Illumination device reflected by magnetic tape MT ′ protruding from surface 2
CCD camera (imaging device) 4 for imaging light from the device 41
2 is mainly provided. The illumination device 41 is an optical fiber
It is a small device that uses the appropriate method for the light emitting part only
It can be installed in a narrow place by pulling out and fixing with
The Moreover, this illuminating device 41 has an optical axis that is a magnetic tape.
Clearance that opens when the lid L of the cartridge C is opened
It is installed in a direction that goes to hub H through C1.
The The CCD camera 42 is a magnetic tape cartridge.
Magnetic field protruding from hub H or winding surface 2 inside wedge C
This magnet is used to image the light reflected by the tape MT ′.
With the lid L of the air tape cartridge C opened
It is installed at a position where the internal hub H can be seen. Snow
That is, magnetic tape M protruding from hub H or winding surface 2
The light reflected by T ′ is the gap of the magnetic tape cartridge C.
The image is taken by the CCD camera 42 through the interval C1.
Become. The CCD camera 42 picked up the image.
Image processing device using image (light size and position) as signal
(Not shown). And this image processing device
From the winding surface 2 based on the size and position of the light.
Existence of protruding magnetic tape MT 'and protruding magnetic tape
The position of MT ′ is recognized. Next, the winding form by this winding form evaluation device 4
The evaluation method will be described. First, as shown in FIG.
Inspection of the magnetic tape cartridge C with the winding form evaluation device 4
Is set at a predetermined position. And this time winding
If the magnetic tape MT ′ does not protrude from the surface 2, the illumination
When light is radiated from the device 41 along the winding surface 2, this
The light is reflected by the hub H and captured by the CCD camera 42.
It is. On the other hand, the magnetic tape MT ′ protrudes from the winding surface 2.
If it is out, as shown in FIG.
The light emitted toward the hub H is the protruding magnetic antenna.
Reflected by the loop MT ′ and imaged by the CCD camera 42
It is. Thus, the image is picked up by the CCD camera 42.
As shown in FIG. 9 (a), the image obtained from the winding surface 2 is magnetic.
When the air tape MT 'is not protruding, it is reflected by the hub H
The surface light is rough compared to the magnetic tape MT ′.
Diffused by the surface of the hub H, it becomes an image of a large width of light
The On the other hand, the magnetic tape MT ′ protrudes from the winding surface 2.
The surface of the magnetic tape MT ′ is mirror-like.
As shown in Fig. 9 (b), the light is not diffused from
It becomes a small image of light. That is, a large width of light
When taken, the roll is a regular figure
(OK product) is recognized by the image processing device and small
When a wide light is imaged, the magnetic tape is drawn from the winding surface 2
MT 'protrudes (NG product) for image processing
Recognized by the device. Further, the range of light in the image of the OK product is indicated.
How much light is captured with respect to a predetermined position
By measuring with an image processing device
K / NG can also be determined. OK product like this
The result of the subsequent inspection with reference to the image of FIG.
It is a graph shown in 0. The graph in FIG. 10 shows magnetic tape
A sample of the result of inspecting the MT appearance is shown on the horizontal axis.
The reflection position (solid line) is shown on the left vertical axis, phase
The degree of interest (dashed line) is plotted on the right vertical axis.
The The degree of correlation is determined based on a captured image of a reference OK product,
This is the calculated correlation between the sample images.
The higher the degree of involvement, the closer it is to the standard OK product image.
Indicates that In addition, the reflection position of the standard OK product
As the reflected light is shifted to the right,
And plot it. Like this graph, for example
By looking at the position of the light reflected in the image and the degree of correlation, it is OK.
Product and NG product can be discriminated. Ie reflection
The position is within a predetermined range (about 0 to 2 mm) and the degree of correlation is
If it is above the specified value (about 70%)
Other than that, it may be determined as an NG product. According to the above, in the third embodiment,
The following effects can be obtained. According to this embodiment
For example, the winding state of the magnetic tape MT can be evaluated by image processing.
In addition, the lighting device 41 using an optical fiber is used.
Therefore, make the whole roll evaluation device 4 compact.
Can do. That is, an opening for shining light on the reel
Even with a narrow magnetic tape cartridge, inspection of the winding state
Is possible. As mentioned above, the present invention is limited to the above embodiment.
It is implemented in various forms without. (1) In the second embodiment, magnetism protruding from the winding surface 2
Calculate the position of the tape MT 'based on the position of the reflected light
However, the present invention is not limited to this.
There is no. For example, the projector 31 in the second embodiment
The time it takes for the light emitted from the light to reach the light receiver 32
Of the magnetic tape MT ′ protruding from the winding surface 2
The position may be calculated by the control device. (2) Also, as shown in FIG.
As the evaluation device 5, for example, the winding surface 2 of the magnetic tape MT
Laser irradiation device (projector) 51 for irradiating light along
And an object irradiated with light by the laser irradiation device 51
Focus on objects (such as magnetic tape MT 'protruding from winding surface 2)
And a light receiver 52 that receives light when the two are combined.
May be adopted. Specifically, this winding form evaluation device 5
In addition to the laser irradiation device 51 and the light receiver 52, a part of the light
That has a mirror surface on one side so that it can transmit light and reflect part of it.
F mirror 53, pinhole plate 54, lenses 55, 56
And a tuning fork 57. And the laser irradiation apparatus 5
When laser is emitted from 1, this laser is half mirror 5
3 and lenses 55 and 56 are transmitted through the hub H or protruding.
Reflected on the same optical path by the magnetic tape MT ′. This
When the reflected light passes through the lenses 55 and 56, the
Reflected by the mirror 53 in a predetermined direction, the pinhole plate 5
The amount of light received through the pinhole 4 is measured by the light receiver 52.
Is done. At this time, the relative position of the lenses 55 and 56 is the tuning fork.
57, it changes at any time by being vibrated at high speed.
Therefore, the amount of light received by the light receiver 52 also changes at any time.
The And when this amount of received light is maximized, that is,
The relative position of the lenses 55 and 56 is the voltage when in focus.
And a control device (not shown) based on the signal
The position of the protruding magnetic tape MT ′ is calculated. That
Therefore, this winding form evaluation device 5 was also focused.
Based on the relative distance (focal length) of the lenses 55 and 56
The position of the magnetic tape MT ′ protruding from the winding surface 2 is recognized.
The magnets wound around the hub H with flanges
The appearance of the Qi tape MT can be evaluated. More
In addition, in this winding form evaluation device 5, a half mirror 53 is used.
Use a single optical axis.
Even if the gap where the hub is visible in the tape cartridge is narrow
It can be inspected well. In addition, this winding figure evaluation equipment
In the device 5, the tuning fork 57 is moved to move the lenses 55 and 56.
Although used, the present invention is not limited to this.
You can move the lenses 55 and 56 with a Zo element or motor.
Yes. In addition, the light receiver 52 in this winding form evaluation device 5,
Half mirror 53, pinhole plate 54, lenses 55, 5
6 and tuning fork 57 correspond to the “imaging device” in the claims.
Is. (3) In the first embodiment, a single reel R
In the present invention, the winding form is inspected.
As in the second and third embodiments, it is not limited to 2
Magnetic tape cartridge C with one reel or one
You can inspect the tape cartridge that contains the reel.
Yes. Also, as in the second and third embodiments, two reels
When inspecting a magnetic tape cartridge C having R
Is a magnetic tape cartridge in each winding form evaluation device 3, 4
C Lock mechanism for locking reel R when not in use
You may provide the mechanism to cancel in the reel installation part 11b. This
By providing a mechanism for releasing the lock mechanism
The reel R to be inspected is urged by the lock mechanism
Good inspection without shifting from the predetermined measurement position
It can be performed. The tape winding position is
Floodlight 1 so that it can be inspected even when approaching the center or upper side
2 and two sets of light receivers 13 may be provided one above the other. (4) The present invention is not limited to magnetic tape, but microfilament
Applicable to all belts such as film, paper tape, adhesive tape
Is possible. In accordance with the present invention, the hub has an opaque furan.
Even if the reel is formed with a flange, its flange and strip shape
Since it suffices to irradiate light between the winding surfaces of the object,
You can evaluate the appearance of the strips. Also evaluate the winding appearance
When you do, just irradiate light,
There is no need to move the device or wait for the pressure to stabilize.
To increase the line speed in the evaluation process
Can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a winding form evaluation apparatus according to a first embodiment of the present invention. FIG. 2 is a plan view showing the winding form evaluation apparatus of FIG. 1; FIG. 3 is a cross-sectional view showing the winding form evaluation apparatus of FIG. 1; FIG. 4 is a plan view showing a winding form evaluation apparatus according to a second embodiment. 5 is an enlarged view of a main part showing a state in which the position of the magnetic tape protruding from the winding surface is detected by the winding form evaluation apparatus of FIG. 6 is a graph comparing results detected by the winding form evaluation apparatus of FIG. 4 with measured values. FIG. 7 is a plan view showing a winding form evaluation apparatus according to a third embodiment. 8 is a main part enlarged view showing a state in which the magnetic tape protruding from the winding surface is imaged by the winding form evaluation device of FIG. 7; FIG. FIGS. 9A and 9B are diagrams showing an image captured by the CCD camera of FIG. 7, a diagram showing an OK product image and a diagram showing an NG product image. FIGS. FIG. 10 is a graph showing a result of subsequent inspection using an image of an OK product as a reference. FIG. 11 is a plan view showing another embodiment of the winding form evaluation apparatus according to the present invention. [Explanation of Symbols] H Hub (core) MT, MT 'Magnetic tape (band) 1, 3, 4, 5 Roll form evaluation device 12, 31 Light projector 13, 32 Light receiver 2 Roll surface 41 Illumination device (light projector) 42 CCD camera (imaging device)

Claims (1)

What is claimed is: 1. An apparatus for evaluating a winding shape of a strip wound around a winding core, wherein at least a part of the light passing through the vicinity of the winding core is applied to a winding surface of the strip. An apparatus for evaluating a rolled form of a belt-shaped object, comprising: a light projector that irradiates along a light source; and a light receiver that receives light from the light projector.