JPH11295237A - Flaw inspection equipment for film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flaw inspection system for film in which a film is prevented from crumpling during travel. SOLUTION: A flaw inspection system for film comprising a feeding section 20 for supporting a blank where a film F is wound into a roll rotatably, a section 30 for taking up the film F fed out from the blank, a section 50 for detecting flaw of the film F traveling between the feeding section 20 and the take-up section 30, and a guide 40 for guiding the traveling film F in front and rear of the detecting section 50 is further provided with a tension controller 27 for sustaining tensile force of the traveling film within a specified range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film defect inspection apparatus.

[0002]

2. Description of the Related Art Films and sheets (hereinafter referred to as "films") are wound into rolls after production and made into raw materials.
If a foreign substance or the like exists in this film, it is treated as a defective product. When the film is, for example, a plastic film, even a small amount of the granular material of the film resin raw material may be present in the film in an unmolten state, or the foreign material may be present in the film as it is as a mixture of foreign substances. Yes, this is determined as a foreign substance.

[0003] Therefore, it is necessary to confirm that the above-mentioned film is a good product or, if it is a defective product having foreign matter, to confirm its substance. For this purpose, a defect inspection is performed after the film is manufactured.

Conventionally, this film defect inspection has been performed visually by an inspector or by using an optical inspection device. An original film is rotatably supported by a feeding section, and an inspection is performed while the film is pulled out from the original sheet and wound up by a winding section. For visual inspection,
The inspector can sufficiently inspect the film pulled out from the sending section while slowly winding the film by hand, but the operation is very inefficient because the film is generally very long. Therefore, an automatic inspection is often performed while the film is automatically wound by the winding unit and the film is continuously driven at a constant speed. According to this method, when a specific portion of the film emits a signal of a different level with respect to the surroundings when the film is optically scanned, it is determined that the signal is a foreign substance. Then, the content and position are recorded, and the state of the film can be visually re-determined later based on the recording.

[0005]

However, when an optical defect inspection is performed while the film is running, if the film is slightly wrinkled, a level signal different from the surroundings is obtained at this portion. The wrinkled portion may be determined as a defect having a foreign substance, and may be determined to be a defective product despite the fact that the product is a good product. or,
When a visual inspection is performed, wrinkles and foreign matter can be distinguished, but it is unavoidable that determination is difficult and efficiency is not good. This is particularly noticeable when the film is colored. Therefore, in any case, a defect inspection apparatus capable of running the film without wrinkles is desired.

[0006] Wrinkling of the film is mainly caused when the tension of the film is inappropriate or when the thickness of the film itself is large. That is, even if the tension is in a range within an appropriate range, wrinkles often occur when the tension is temporally unstable or when the tension is uneven in the film width direction. Thus, avoiding wrinkles results in making the tension of the film always stable at any position within an appropriate range.

In view of such circumstances, an object of the present invention is to provide a film defect inspection apparatus capable of applying a stable and uniform tension to a film in order to prevent the film from wrinkling during traveling. Another object is to make the apparatus easy to monitor for defects.

[0008]

SUMMARY OF THE INVENTION A film defect inspection apparatus according to the present invention comprises: a feeder for rotatably supporting a material roll obtained by winding a film into a roll; and a film drawn from the material roll. A winding unit that winds up, a detection unit that detects a defect of a film that can be run between the sending unit and the winding unit,
A guide for guiding the running film before and after the detection unit. In such a device, the present invention has a tension control device for maintaining the tension of the running film within a predetermined range in order to achieve the above object.

[0009] The tension control device can be provided at the delivery section or between the delivery section and the winding section. The tension control device provided in the delivery section may be an electromagnetic clutch that operates with a set torque, and a guide body that is provided between the delivery section and the winding section may vary a contact state with the film. It can be.

As an example of the guide, the guide may be formed by a plurality of guide rollers, and at least one of the guide rollers may have a variable contact angle with the film so that the film tension can be adjusted. In that case, it is sufficient that at least one guide roller can change its position with respect to the other rollers. The guide may be a curved plate that guides the film at a predetermined contact angle.

It is desirable that the guide body can change the position and the angle of the portion to be detected of the running film with respect to the inspection section, so that the tension can be adjusted and the relative position of the inspection section with respect to the film can be adjusted. The angle and the angle are optimized, and the sensitivity in the inspection section is improved. The detection unit,
If the guide body and the tension control device (the guide body for making the contact state with the film variable) are arranged in the film production line, thereby inspecting the film for defects during the production and storing the defective parts. Can be made.

If the film defect inspection apparatus thus configured is additionally provided with a marker for marking a reference position mark on the running film at a predetermined time, based on the reference position written on the film, Defect positions can be easily found on the film.

Such a marker includes, for example, a linear drive body that linearly moves at a predetermined time, and a mechanism that converts the linear movement into a rotation. A writing instrument is attached to a rotation member provided in the mechanism. This can be realized by writing the reference position mark by contacting the writing implement with the film at a predetermined time.

[0014] Furthermore, the present invention provides a transmitting unit described at the beginning,
In an apparatus including a winding unit, a detection unit, and a guide body,
The winding unit has a pair of rollers that rotate at a constant speed and press against each other to pull the film at the pressed portion, and a support shaft that supports a bobbin that winds the film drawn from the pair of rollers. The above object can also be achieved by stabilizing the winding speed such that a part of the outer periphery of the roll-shaped film on the bobbin is brought into pressure contact with one of the paired rollers to receive a rotational force, thereby stabilizing the winding speed. In this case, if the sending section and the winding section can be operated in both the forward and reverse directions, the film can be reversely run, and the film can be rewound to the defective portion for reconfirmation. This can be achieved by sequentially and sequentially confirming a plurality of defects after the inspection is completed, or by confirming each defect during the inspection. For the reverse running of the film, the feeding section and the winding section at the time of forward running respectively function as a winding section and a feeding section, respectively. The film is pressed against one of the paired rollers on the side of the sending section.

According to the present invention, the detecting section is connected to the image processing apparatus and the recording apparatus, and the image processing apparatus displays the defective portion of the sheet as a visible image, and the recording apparatus stores the position of the defective section. Alternatively, if the recording is performed, the inspection status can be monitored by the image processing apparatus during the inspection, and the data regarding the defect can be obtained by the recording apparatus.

[0016]

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

FIG. 1 is a schematic structural view of the apparatus of this embodiment as viewed from the front. In FIG. 1, on a base 10 of the apparatus,
A film sending section 20 on the left side, a winding section 30 on the right side,
The guide body 40 and the inspection unit 50 are disposed in the middle part.
The sending section 20 and the winding section 30 have a symmetrical configuration, and their functions can be reversed by performing reverse rotation operation.

The sending section 20 and the winding section 30 are connected to the base 10
A pair of pinch rollers 22 (22A and 22B) and 32 (3) rotatably supported by arms (not shown) that hang from support portions 21 and 31 fixedly provided thereon.
2A and 32B) respectively. One of the pinch rollers 22A and 22B or one of the pinch rollers 32A and 32B is rotationally driven by a motor (not shown) or the like built in the base 10 via a transmission means as appropriate. The lower pinch rollers 22B, 32B are set to be able to freely contact and separate from the upper pinch rollers 22A, 32A. The pinch rollers 22 and 32 are used for pinch rollers 22A and 22B when the film is transported under a narrow pressure.
Alternatively, the peripheral speeds of the pinch rollers 32A and 32B are set to be the optimum film feed speed for defect inspection.
Since the optimum speed may vary depending on the film, it is desirable that the peripheral speed be variable.

The support shafts 23, 3 are provided from the support portions 21, 31.
3 each extend laterally. The support shafts 23, 3
Movable stands 24 and 34 are supported on the base 3 so as to be movable in the horizontal direction. The movable tables 24 and 34 are driven by driving means 25 and 35 such as cylinders mounted on the base 10 and move on the support shafts 23 and 33. The movable bases 24 and 34 extend upward, and have material support shafts 26 and 36 for rotatably supporting the film material at the upper end thereof, and an electromagnetic clutch 27 as a film tension control device at an intermediate portion. , 37 are provided, respectively, and the electromagnetic clutches 27, 37 are connected to the material support shafts 26, 36, respectively, via appropriate means such as gears. The electromagnetic clutch is operated under a set torque range, and the torque acting on the material support shaft 26 serving as the sending side or the material acting on the material supporting shaft 36 of the winding unit 30 when the feeding side is provided. Control.

The guide body 40 is located between the feeding section 20 and the winding section 30, and is rotatably supported by each of two support arms (not shown) suspended from the base 10. 41 and a winding-side guide roller 42. The delivery-side guide roller 41 and the winding-side guide roller 42 are each composed of a plurality of rollers, in this example, two rollers 41A, 41B and 42A, 42B. The posture of each of the two support arms can be changed as appropriate, and the two rollers 41 on the support arms can be changed.
The relative positions of the rollers A and 41B with respect to the film F and the relative positions of the two rollers 42A and 42B with respect to the film F can be variably set. Further, a tension roller 43 for changing the position and tensioning the film is rotatably disposed between the delivery-side roller 41 and the winding-side roller 42.

The inspection unit 50 includes a light source unit 5 supported by a support member (not shown) mounted on the base 10.
1 and a monitoring camera 52. In the case of this example, the light source unit 51 is located below the film F that travels from the roller 41A as a guide to the roller 42A via the tension roller 43 and has a lamp 51A and a lens 51B. . The lens 51B extends in the width direction of the film F (in the direction perpendicular to the paper surface in FIG. 1) so that the cross section forms a semi-cylindrical body. The light is almost uniformly distributed over the range of the film F.
Is to be irradiated. The surveillance camera 52 is located above the film F and receives light transmitted through the film F. Such a surveillance camera 52
The position and the direction of the light source 51 can be variably set, so that the mutual positional relationship between the light source 51 and the detected portion of the film can be optimized. At this position, the monitoring camera 52 scans the film F in the width direction.

The monitoring camera 52 is connected to an image processing device 61 as shown in FIG. The image processing device 61 performs a ternary process on the electric signal level from the monitoring camera 52 to determine a defect. That is, the signal level range is divided into a normal level range of a signal obtained in advance from a non-defective film which is regarded as having no defect, and three levels of a high level and a low level of an abnormal level. And has a function of determining to which range the signal from the detected portion of the film F belongs. The image processing device 61 itself is known, and will not be described in detail here.

The image processing device 61 includes a computer 62
And the monitor 63. A computer 62 as a recording device graphically displays the types, sizes, positions, and the like of the defects on the screen based on an input signal from the image processing device 61 and records the defects on the screen.
Can also be printed. The monitor 63 as a part of the image processing device displays the state of the film F as a visible image on a screen in a state where the film F is ternarized by the image processing device 61.

As shown in FIGS. 1 and 2, a marker 70 for marking a reference position mark on the running film F at a predetermined time is provided above the winding roller 42A.
The marker 70 is activated at a predetermined time by a command from the outside, for example, a signal synchronized with the clock signal of the computer 62, so that a reference position mark can be written with a writing instrument such as a pen. The reference position mark may be recorded only at the time of starting the film withdrawal from the raw material, or may be recorded intermittently at regular intervals thereafter. or,
The marker 70 can mark the position of the detected defect based on the defect signal.

In the apparatus of this embodiment, the film F
Is performed in the following manner. Prior to the operation of the defect inspection apparatus, the raw film of the film to be inspected is shown in FIG.
Set to 6. In the sending section 20, the movable table 24 is positioned so that the raw material is separated from the upper pinch roller 22A by the driving means 25, and the lower pinch roller 22B is lowered to move the upper pinch roller 22A.
It is separated from A. On the other hand, in the winding unit 30, the lower pinch roller 32B is raised and pressed against the upper pinch roller 32A, and the bobbin on the web support shaft 36 is driven by the driving means 35 to move the upper pinch roller 32B. Is pressed against. When the film to be inspected is selected, its characteristics are specified, and the film is adjusted to a diameter that changes from the maximum diameter to the minimum diameter so that the tension of the film falls within the optimal range that satisfies this characteristic. Then, the set torque is obtained, and the set torque of the electromagnetic brake 27 is set to this value. Then, based on the characteristics of the film, the position and orientation of the light source unit 51 and the monitoring camera 52 with respect to the film are set so that the detection state is the best, that is, the detection is performed with high sensitivity. The electromagnetic brake 37 on the winding section 30 is not operated. Next, as shown in FIG.
6, the film F is pulled out from the material on the roller 22A,
Guide rollers 41B and 41A, tension roller 43, guide rollers 42A and 42B, and pinch rollers 32A and 3
After passing through 2B, the leading end of the film F is wound around a bobbin on the web support shaft 36 of the winding section 30. The operation of the inspection apparatus in such a state will be disclosed. Winding unit 3
One of the pair of pinch rollers 32A, 32B is rotated by receiving a drive from a motor in the base 10, and presses the film F to feed the film F at a constant speed in the direction indicated by the solid line. Since the outer peripheral surface of the roll film wound around the bobbin on the material support shaft 36 is pressed against the pinch roller 32A,
The film F is rotated by the same speed as the peripheral speed of the pinch roller 32A by receiving the friction drive from the pinch roller 32A, and the film F is wound up. At this time, a reference position mark is appropriately written on the film F by the marker 70 at the start of winding. The light emitted from the light source unit 51 to the running film F passes through the film F, and the monitoring camera 52 that scans the film F in the width direction receives the light. In the monitoring camera 52, the detected light is converted into an electric signal, and this electric signal is supplied to the image processing device 61 shown in FIG. In the image processing device 61, a normal level range of a signal level determined in advance as a film having no defect for the same kind of film, and a high and low abnormal level range with respect to the signal level are set. The electric signal from 52 is divided into the three ranges described above, that is, subjected to ternarization processing, and the presence or absence of a defect, its size, and the like are determined. The ternarized signal is directly observed on the screen of the monitor 63 as a visible image,
The data is sent to the printer 2 and stored therein, and data relating to the defect is displayed based on a certain standard. The data is recorded by the printer 64 as necessary. Observe on computer 62 or monitor 63,
When a part determined to be defective is found and the part is visually reconfirmed, the film F is sent in the reverse direction after or during the inspection to bring the defective part to the visual position. At this time, the return amount of the film can be obtained based on the reference position mark written on the film F by the marker. When the film is fed back, the functions of the feeding section 20 and the winding section 30 must be reversed, and each member is positioned in the positional relationship shown by the two-dot chain line shown in FIG. That is, the lower pinch roller 32B and the roll-shaped film of the web support shaft 36A are separated from the upper pinch roller 32A of the winding unit 30, respectively. The roller 22B and the web on the web support shaft 26 are pressed against each other. The motor in the base 10 is switched so as to drive the pinch roller 22B on the sending section 20 side in the direction of the broken line, and the electromagnetic brake is set so that the electromagnetic brake 37 on the winding section 30 operates with the set torque. You. At this time, the electromagnetic brake on the sending section 20 side does not operate at all, and thus the defective portion of the film F is found during running, and its state is determined. However, if the film F has wrinkles, it may be erroneously determined to be a defect. In this case, change the set torque of the electromagnetic clutch,
By resetting the relative position of each guide roller as a guide and changing the film contact angle, the tension of the film is adjusted so that there is no wrinkle.

Next, in the present invention, a more specific embodiment of a guide body and a marker by a guide roller will be described with reference to FIGS. 3 and 4, respectively. In addition,
The same parts as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The guide member shown in FIG. 3 corresponds to the guide roller 41 on the sending section side of the guide member shown in FIG.
Therefore, at the time of implementation, it is preferable that a guide body configured symmetrically to this is also provided on the winding unit side.

In FIG. 3, a support arm 44 is provided upright from the upper surface of the base 10 of the apparatus, and an upper pinch roller 22A is rotatably supported on an upper portion thereof. on the other hand,
The shaft of the lower pinch roller 22B is
8, the bearing block 28 is connected to a lot 29A of a cylinder device 29 on the base 10. The support arm 44 has an overhang portion 44A at an upper portion, and an L-shaped rotating arm 45 is rotatably supported by a shaft 46 here.

A lower guide roller 41B is provided on the rotating arm 45 at the position of the shaft 46, and a shaft 4 is provided at the upper end of one arm.
7, the upper guide roller 41A is rotatably supported. The overhanging portion 44A has an arc-shaped groove 44B.
Is formed, and a pin 45A provided on the other arm of the rotating arm 45 is guided by the groove 44B. Further, the position of the rotating arm 45 can be fixed at an arbitrary rotating position.

Thus, by changing and setting the turning position of the turning arm 45, the position of the guide roller 41A can be changed to the position indicated by the two-dot chain line in FIG.
By changing the position of the guide roller 41A, the traveling path of the film F, that is, the traveling position and the angle of the film F are changed. Also, the contact angle of the film F between the guide rollers 41A and 41B can be changed. If such a change in the position of the guide roller is performed also on the guide body on the winding section side, the range of the change becomes extremely wide.

Further, with respect to the pinch rollers 22A and 22B, the contact and separation thereof can be freely changed by the operation of the cylinder device 29.

Next, the marker 70 can be easily embodied by using, for example, a mechanism for converting linear motion into rotation. In the example shown in FIG. 4, an electromagnetic solenoid 73 is attached to a base 72 of the marker 70, and a bar member 74 is provided on a rod 73 </ b> A of the electromagnetic solenoid 73. The bar member 74 has a cam projection 74A on the upper surface, and is guided by a guide member 75 on a base 72 to stably perform its linear motion.

On the other hand, a supporting member 76 is provided on the base 72, and the arm-shaped rotating member 7 is
7 is rotatably supported by a pin 78. The rotating member 77 has a rotatable cam follower 79 at one end, and holds the writing implement 71 at the other end. According to the marker 70, the electromagnetic solenoid 73 is excited at a predetermined time, the rod 73A is ejected, and the cam projection 74A
Raises the cam follower 79 upward for a moment. As a result, at that moment, the rotating member 77 rotates counterclockwise about the pin 78, and the writing implement descends to write a reference position mark on the film F. When the excitation of the electromagnetic solenoid 73 is released, it is preferable to provide an urging means for returning the rod 73A to the retracted position.

The present invention is not limited to the applications shown. The illustrated one is a form as an apparatus for inspecting a raw material once completed as a product.
It can be incorporated as a part of a film manufacturing apparatus.
By doing so, the film can be inspected during the manufacturing process, and when a defect is found, it is possible to respond to changing the manufacturing conditions immediately.

[0035]

As described above, according to the present invention, the film tension is optimally adjusted in accordance with the characteristics of the film and the running conditions when inspecting for foreign matter or the like as a defect while running the film. As a result, wrinkling of the film can be suppressed. As a result, erroneous recognition of film defects is drastically reduced, and the reliability of the inspection is improved and the efficiency of the inspection operation is also improved. In addition, tension control for preventing wrinkles can be realized with a simple mechanism, and an easy-to-handle and low-cost inspection device is obtained. Further, if the inspection apparatus of the present invention is incorporated in a film manufacturing facility, the production of a defective film can be stopped halfway when there is a defect, or the operation can be restarted with appropriate conditions.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing peripheral devices for image processing applicable to the device of FIG. 1;

FIG. 3 is a front view showing a embodied embodiment of a guide body applicable to the apparatus of FIG. 1;

FIG. 4 is a partially cutaway front view showing a embodied embodiment of a marker applicable to the apparatus of FIG. 1;

[Explanation of symbols]

 Reference Signs List 20 Sending unit 26 Support shaft 27 Tension control device (electromagnetic clutch) 30 Winding unit 36 Support shaft 37 Tension control device (electromagnetic clutch) 40 Guide 41 Guide roller 41A Guide roller 41B Guide roller 42 Guide roller 42B Guide roller 50 Detection unit 61 Image Processing Device 62 Recording Device (Computer) 64 Recording Device (Printer) 70 Marker 71 Writing Tool 73 Linear Drive (Electromagnetic Solenoid) 74 Conversion Mechanism (Rod) 77 Conversion Mechanism (Rotating Member)

Claims (12)

[Claims] 1. A feeding section for rotatably supporting a web formed by winding a film into a roll, a winding section for winding a film drawn from the web, a feeding section and a winding section. A detecting unit for detecting a defect of the film to be run between the
A film defect inspection apparatus comprising a guide body for guiding a running film before and after the detection unit, wherein the film has a tension control device for maintaining a tension of the running film within a predetermined range. Defect inspection equipment. 2. The film defect inspection apparatus according to claim 1, wherein the tension control device is provided in the sending section. 3. The film defect inspection apparatus according to claim 2, wherein the tension control device is an electromagnetic clutch that operates with a set torque. 4. The film defect inspection apparatus according to claim 1, wherein the tension control device is a guide that changes a contact state with the film. 5. The film defect inspection apparatus according to claim 4, wherein the guide is a plurality of guide rollers, and at least one of the guide rollers has a variable contact angle with the film. 6. The film defect inspection apparatus according to claim 5, wherein a position of at least one guide roller is changeable with respect to another roller. 7. The guide body according to claim 1, wherein a position and an angle of a portion to be detected of the running film with respect to the inspection portion can be changed. The described film defect inspection apparatus. 8. A film defect inspection apparatus according to claim 1,
A film defect inspection apparatus comprising: a marker for marking a reference position mark on a running film at a predetermined time. 9. The marker includes a linear driving body that linearly moves at a predetermined time, and a mechanism that converts the linear movement into a rotation, and a writing instrument is attached to a rotating member provided in the mechanism. 9. The film defect inspection apparatus according to claim 8, wherein the writing instrument sometimes comes into contact with the film to mark the reference position mark. 10. A sending section for rotatably supporting a web formed by winding a film into a roll, a winding section for winding a film drawn from the web, the sending section and a winding section. In a film defect inspection apparatus having a detecting unit for detecting a defect of a film to be run between the detecting unit and a guiding body for guiding the running film to the front and rear of the detecting unit, the winding unit rotates at a constant speed and rotates alternately. And a support shaft for supporting a bobbin for winding the film drawn from the pair of rollers, the support shaft being provided on the outer periphery of the roll-shaped film on the bobbin. A film defect inspection apparatus characterized in that a part of the film is pressed against one of the paired rollers and receives a rotational force. 11. The film defect inspection apparatus according to claim 1, wherein the sending section and the winding section can be operated in both forward and reverse directions. 12. A detection unit connected to an image processing device and a recording device, wherein the image processing device displays a sheet-like defect portion as a visible image, and the recording device stores or records the position of the defect portion. The film defect inspection apparatus according to claim 1 or claim 10, wherein