JPH07209207A - Defect inspection apparatus for endless sheet - Google Patents

Abstract

PURPOSE:To provide a high speed defect inspection apparatus for endless sheet. CONSTITUTION:The defect inspection apparatus for endless sheet comprises means 44 for detecting defects of an endless sheet (a) flowing in one direction, means PE for detecting the speed of the sheet (a), a labeller 50 disposed farther downstream of the sheet (a) from the detecting means 44, and a controller. Upon the lapse of a delay time lag calculated based on a defect detection signal from the detecting means 44 and a speed signal from the speed detecting means PE, the controller delivers a command to the labeller 50 to put a label as the mark for defective portion on the sheet (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect inspection of an endless sheet, and more particularly, to an apparatus for finding and marking a defective portion of printing on a sheet.

[0002]

2. Description of the Related Art A printed endless sheet or paper is usually rolled into a cylindrical body. Then, it is transported to a place of use, unrolled, cut into an appropriate length, and processed into wrapping paper or the like.

However, when a cylindrical sheet is used after being cut by an automatic machine or the like, if there is a defective portion in the printing, a defective product will be produced as it is by the automatic machine, so that the printing failure will occur prior to use. It is necessary to find the part and remove it.

In order to solve such a problem, FIG.
An inspection device for a cylindrical body, that is, a roll-shaped sheet shown in Fig. 5 has been proposed. In the figure, reference numeral 1 is a base, which has a swing frame 2 on the left side of the figure and a fixed frame 3 on the right side, and an operation panel 4 is fixed above the fixed frame 3. The swing frame 2 has wheels between it and the base, and can be moved back and forth in a direction perpendicular to the paper surface (that is, in the plane of the sheet a) by a drive device (not shown). Reference numeral 5 is a supply reel, in which a gripping shaft is inserted into the hollow shaft of the cylindrical body A and is firmly fixed by an air chuck. 6 is a take-up reel.

The cylindrical body A is attached to the supply reel 5, the sheet a is unwound, and the touch rollers 12a and 12b of the touch roller arm 12 are passed through the guide rollers 7 to 11.
And is wound around the take-up reel 6 through the reverse S-shape.

An edge detecting device 13 is provided between the guide rollers 7 and 8 to detect the position of the edge of the sheet. A counter 14 is provided on the guide roller 8 and measures the length of the sheet. A horizontal workbench 15 is provided between the guide rollers 9 and 10, and pressing bars 16 and 17 are provided at both ends of the workbench 15.

FIG. 16 shows a workbench 15 and a pressure bar 16, 1.
It is a figure which shows the detail of 7. The workbench is fixed to the frame 3, the lower ends of the presser bars 16 and 17 are pivotally supported by the frame, and the workbench is mounted on the workbench from the vertical position (FIG. 16 (a)) attracted to the magnets 16a and 17a provided on the frame. It is rotatable between horizontal positions (dotted line position in FIG. 16B) for pressing the sheet.

Next, the operation of this device will be described. The cylindrical body A is lifted by human power such as an operator and attached to the supply reel 5. Next, the leading edge of the sheet is taken out, and the guide rollers 7 to 11 and the touch rollers 12a,
The front end can be wound around the take-up reel 6 through 12b as illustrated. The touch roller presses the reel being wound by the weight of the touch roller arm and keeps the tension applied to the sheet a constant.

When the worker operates the operation panel to determine the feeding speed of the sheet a and starts the motor 18, the take-up reel 6 rotates to start winding the sheet a, and the supply reel is in accordance with the drawn amount. Rotate. The worker visually inspects the sheet a passing over the work table 15 and inspects the defective portion. When a defective portion is found, the apparatus is stopped, and it is reversed to return the defective portion to the top of the workbench 15, and the pressing bars 16, 1
16 is pushed down to the position of FIG. 16 (a) to (b), and both ends of the sheet a are pressed onto the workbench 15.

A V-shaped groove 15a is formed in the center of the work table 15.
Is formed, and the cutting position is brought here to cut with a cutter knife or the like. When printing a sheet, a pattern with the same pattern is usually printed repeatedly, so defective portions are deleted in units of frames. That is, if the defective portion is within one frame, that frame is deleted, and if it extends to two frames, two frames are deleted. Then, after cutting, both cut end faces are overlapped with each other to match the printing pattern, and a tape or the like is attached to connect them.

Send the sheet again to find the defective part,
If found, remove defective parts by the same procedure as above. When the sheet a on the supply reel 5 side is used up, the inspection work is completed. However, the sheet a wound on the take-up reel 6 is
It is in the opposite direction to the sheet a of the supply reel, and if it is used as it is, for example, when this sheet is used as a wrapping paper, the direction of the pattern will be the opposite direction. Therefore, the take-up reel 6 reversely reverses and rewinds the supply reel 5. When searching for a defective portion, the speed of the sheet must be as low as about 2 m / sec, but rewinding can be performed at a high speed of 150 to 200 m / sec.

At the time of rewinding, the meandering of the sheet is adjusted so that the end faces of the finished rolls are neatly aligned to prevent the end faces from becoming sharp and making it difficult to store the rolls or damaging the convex portions of the end faces. . Therefore, the above-mentioned edge detecting device 13 is provided. That is, the edge detection device 13 detects the position of the edge of the sheet a, and the swing frame 2 is moved in the plane of the sheet (in the direction perpendicular to the plane of the sheet) accordingly to cause the supply reel 5 to follow the meandering. , I try to align the ears.

[0013]

However, in the above-mentioned prior art, since the inspection of the sheet is performed by the naked eye, the feeding speed of the sheet must be slowed down. It took a lot of time because it was necessary to stop, reverse, and find the defective part again. The present invention is intended to solve this problem, and an object thereof is to provide an apparatus capable of inspecting a defective portion at high speed.

[0014]

In order to achieve the above object, the present invention provides a detecting means for detecting a defective portion of a sheet flowing in one direction, a speed detecting means for measuring the speed of the sheet, and the detecting means. A labeler arranged further downstream in the sheet flow direction, and a control device, the control device comprising a signal for detecting a defective portion from the detection means, a speed signal from the speed detection means, and a mechanical device for the labeler. It is characterized in that the labeler is instructed to attach a label as a mark of a defective portion to the sheet after a delay time calculated from the operation time is elapsed.

Further, the endless sheet has a surface on which the same pattern is repeatedly drawn, and the detection means is an electronic camera, and the camera continuously and continuously photographs a fixed length of the sheet, and the front is photographed. When the two images of the captured image and the next captured image do not match, either one may be determined to be a defective portion, and the labeler attaches a label in a state of protruding from the end of the sheet. Is desirable.

[0016]

Operation: The endless sheet flows by the detection means including the electronic camera. The speed detecting means measures the speed of the sheet. The camera successively shoots the same predetermined length on the sheet. Then, the signal patterns of one shooting and the next shooting are compared, and if they do not match, it is determined that one contains a defective portion. Then, a signal for finding a defective portion is sent to the control device. Based on the speed from the speed detection means, the control device determines the delay time in consideration of the mechanical operation time of the labeler, gives an instruction to the labeler after the delay time has passed, and attaches a mark to the defective portion. . Since it is a mechanical inspection, the speed can be increased and the inspection efficiency is greatly improved.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a printing inspection device for rolled sheets as a cylindrical body processing device of the present invention. The schematic structure of the apparatus will be described with reference to FIG. A is a cylindrical body formed by rolling a sheet of paper or the like in a roll shape, which is cut from a wide rolled sheet having a width of about 2 m, and is 30 mm to 250 mm.
It has a narrow width. “A” indicates the sheet itself printed on the surface. 21 is a base, 22 is a swing frame, and 23
Is a fixed frame, 24 is an operation panel, 25 is a supply reel, and 26 is a take-up reel. Of these, the operation panel is provided with a control device inside and various operation devices are arranged outside, which is different from the conventional one, but the other is essentially the base and the like explained in the conventional example. Are the same.

The sheet a released from the cylindrical body A is touch rollers 27a, 27 at the tip of the touch roller arm 27.
b is passed in an S-shape, and the touch rollers 40b and 40a are passed through the guide rollers 28 to 39 from the touch roller arm 40 on the take-up reel 26 side in an inverted S-shape.
Wrapped around. The tension applied to the sheet a at the time of winding is measured by the guide roller 29.

Numerals 41 and 42 are edge detectors for detecting the positions of both edges of the sheet a by the photocells, and constitute the first edge adjuster together with the swing frame 22. 43
Is a length measuring device that measures the length of the sheet wound from the supply reel 25 to the take-up reel 26. Reference numeral 44 denotes a detection means, which is an electronic camera such as a CCD camera, which illuminates the sheet a from the front and / or the back by illuminating devices 45, 46, 47 such as fluorescent lamps, and photographs the sheet a running below the camera. And find the defective part.

Reference numeral 48 is a second edge adjusting device, 49 is a workbench, and 50 is a labeler for sticking a mark label to a defective portion of the sheet a.

Next, each section of the processing apparatus will be described in more detail. 2 to 4 are views showing the configuration of a supply device 60 for supplying a cylindrical body to the device of FIG. As shown in these drawings, the supply device 60 includes a base 61, a roller conveyor 62 mounted on the base 61, and wheels 63 for traveling mounted on the four corners of the base 61. A reversing device 64 is further attached to the section. The reversing device 64 is composed of a motor 64a, an arm 64b rotated by the motor, and a support shaft 64c attached to the tip of the arm orthogonal to the arm. Wheel 63
The motor is driven by a motor, or the roller conveyor 6
2 may be automatically supplied by providing a mechanism for driving the motor.

The cylindrical body A has a roller conveyor 62 mounted on a base 61 with its central hollow axis Aa perpendicular to the floor 65.
It is placed on the top and is transported to just below the supply reel 25 of the processing apparatus shown in FIG. Arm 64b of roller conveyor 62
There is a gap in the portion corresponding to, and as shown in FIG. 4, the arm can rotate between the position of the dotted line and the position of the solid line, and the cylindrical body A is moved so that the hollow axis Aa of the dotted line is perpendicular to the floor. From this position, the hollow shaft can be inverted and raised to a solid line position where the hollow shaft is parallel to the floor and the height is substantially the same as the air shaft 25a of the supply reel 25.

When the cylindrical body A inverts and rises to the position shown by the solid line in FIG. 4, the cylindrical body A is manually pushed in the direction of the arrow and fitted on the air shaft 25a of the supply reel 25. After that, air is supplied to the air shaft 25a and the cylindrical body A is firmly fixed to the supply reel 25. It should be noted that a pusher for pushing the cylindrical body A into the air shaft 25a may be provided to automate the operation without requiring manual labor.

When the cylindrical body A is transferred to the supply reel 25 of the processing apparatus, the supply apparatus 60 moves away from the position shown in FIG. 4 to a place (not shown) where the cylindrical body is stored to receive the next cylindrical body A. Moving. Then, the winding end end of the sheet is manually pulled out from the cylindrical body A, and the sheet is passed through the sheet as shown in FIG. Since the supply device 60 is provided with wheels so that it can be moved from the front of the supply reel 25, there is no obstacle in front of the device, and the above-mentioned paper passing operation can be facilitated. Further, a rail may be laid from the processing device to the accumulating place of the cylindrical body, and the supply device 60 may be moved on the track.

The full-cylindrical cylindrical body A is attached to the supply reel 25, and the sheet a is passed through the apparatus as shown in FIG.
The sheet a is wound by rotating the take-up reel 26 by a motor. However, if the rotation of the take-up reel 26 is constant, the take-up diameter gradually increases, and the take-up speed at the start of the winding and the end of the winding are finished. Is significantly different from the take-up speed, and the tension applied to the sheet a also changes accordingly, making it difficult to take up the sheet a. Therefore, it is necessary to change the rotation of the take-up reel 26 so that the speed of the sheet a is always constant.

FIG. 5 is a diagram showing the construction of an apparatus for feeding the sheet a at a constant speed. The take-up reel 26 is the motor 2
Driven by 6a, the sheet a of the supply reel 25 is wound up. First, a pulse generator PG is provided between the supply reel 25 and the take-up reel 26, the speed of the sheet a is measured, and signals corresponding to the speed are compared. Input to the means 26c.
The comparison means 26c compares the preset speed input with the speed measured by the pulse generator PG, and outputs a speed correction signal to the constant speed device 26b. Constant speed device 26b
On the basis of the speed correction signal, changes the frequency of the inverter to change the rotation of the motor 26a to keep the speed of the sheet a constant. Although an inverter is used as the constant speed device 26b, for example, a mechanical continuously variable transmission may be used.

Next, the control of the tension of the sheet a will be described. The guide roller 29 also shown in FIG. 1 measures the tension applied to the sheet a as described above.
This output is input to the tension control device 25a, compared with the set tension value input therein, and the powder brake as the braking means provided on the supply reel 25 is activated to reach the set tension value. .

Although not shown, the supply reel 25 has
Like the take-up reel 26, it has a driving motor, a constant speed device, and a comparison means, and the other take-up reel 26 is provided with a tension control device and a powder brake like the supply reel. When all the sheets a of the cylindrical body A of the supply reel 25 are taken up by the take-up reel 26,
A motor (not shown) reverses the supply reel 25 and rewinds the sheet a wound on the take-up reel 26, but the speed and tension of the sheet a can be kept constant in the same manner as described above.

FIG. 6 is a diagram showing the construction of the detection means for finding a defective print portion. Sheet a is guide roller 2
It is guided by 9, 30, 31, 32, 33, 34 and flows from the supply reel 25 toward the take-up reel 26.
The guide rollers 31 and 32 are flat.
Then, the flat sheet a is illuminated by the illumination lamps 45 and 46, and the detection means 44 including the camera placed above is used.
The sheet a flowing through is photographed.

The camera photographs the sheet a as it is flowing, and the sheet a has a predetermined length (preferably one frame or an integer frame for printing).
The image of is captured as one signal pattern and compared with the signal pattern for the next same length. Then, when the two signal patterns do not match, it is determined that there is a defective print portion on the sheet a corresponding to the subsequent signal pattern.
If the front and rear signal patterns match, it is determined that the sheet a corresponding to the rear signal pattern has no defective portion in printing, and this time, the rear signal pattern is set as the front signal pattern, and the third signal pattern is set. The signal patterns are compared with each other as a later signal pattern, the coincidence and non-coincidence of the both are examined, and so on.

The guide rollers 31 and 32 can be moved from the position shown by the solid line to the position shown by the phantom line while keeping the same distance. Then, at the position indicated by the solid line, the illumination lamp 47 illuminates from the back surface of the sheet a and the detection means 44 monitors the transmitted light, and when it moves to the position indicated by the phantom line, it is illuminated by the illumination lamps 45 and 46.
To be monitored by the light reflected from
The illumination can be selected according to the material of the sheet (for example, the thickness of paper).

Since thin paper is traveling at a high speed, if the guide rollers 31 and 32 are at the positions shown by the solid lines, the paper at the inspection position becomes free and fluttering easily occurs. False inspections are likely to occur. Also,
When the sheet a is a cigarette chip paper, fine holes are formed in the thin paper, and therefore the holes are mistakenly recognized as defective parts. Therefore, the rollers 31 and 32 are moved to the positions indicated by the dotted lines, and the roller 32 is made to have the same color as the chip paper to be in close contact with the sheet for inspection.

When a defect is found in the printing of the sheet a, a signal is sent from the camera to the control device in the control panel 24, and the control device gives an instruction to the labeler 50 sending the sheet a, and the labeler 50 Place a label on the defective part.

FIG. 7 is a diagram showing a more detailed structure of the labeler 50. A tape roll B wound with a tape b is fitted on the delivery reel 50a of the labeler 50. Tape b is a continuous base tape b as shown in FIG. 7 (b).
A large number of labels b2 are stuck on the sheet 1 at equal intervals. The tape b is unwound from the roll B, is fed along the guide plate 50c of the lever 50b, is bent at an acute angle at the tip of the guide plate 50c, passes through the guide roller, and then the take-up reel 5
It is wound up to 0d. When the tip of the guide plate 50c is bent at an acute angle, the label b2 cannot follow the bending at the acute angle, and the tip is peeled off from the base tape b1. When the base tape b1 is continuously fed, the label b2 is further peeled off and reaches the roller 50e at the tip of the lever 50b just before being separated from the base tape b1. In this state, the lever 50b rotates counterclockwise about the shaft 50e to attach the label b2 to the sheet a. Since the sheet a is flowing, the label b2 is attached to the base tape b1.
Peel it off and take it. The tape in which the label b2 is peeled off and only the base tape b1 is wound on the take-up reel 50d for one pitch of the label, and the next label b2 is ready to be attached. The label b2 attached to the sheet a is the sheet a
It is desirable that the sheet a be attached so as to project outward from the end of the sheet so that the presence or absence and the position of the defective portion can be immediately recognized from the outside even after the sheet a is wound into a roll.

Since the distance from the position detected by the detection means 44 to the position where the labeler 50 applies the label is constant,
If the feeding speed of the sheet a is constant, if the control device commands the labeler 50 to label after a certain time has elapsed after receiving the signal from the detection means 44, the labeler accurately labels the defective portion position. Can be pasted. But,
Detecting means 4 depending on the difference in the material of the sheet a, the print content, etc.
Since the sheet speed that 4 can monitor is different, the sheet feed rate must be varied accordingly. Therefore, even if the instruction is given after the elapse of a certain delay time, the label cannot be accurately attached to the defective portion position.

In order to solve this problem, this device operates as follows. FIG. 8 is a diagram schematically showing the relationship between the sheet a, the detection unit 44, and the labeler 50 with the movement path of the sheet a as a straight line. Further, FIG. 9 is a block diagram showing a configuration of a system for generating a signal to be attached to a labeler. As shown in FIG. 8, the detection means 44 and the labeler 50.
A speed detecting means PE is provided between the two to measure the speed of the sheet a. The speed detecting means PE is composed of a pulse encoder, and each time a predetermined fixed length of the sheet a passes,
Generates a one-pulse electrical signal. Therefore, the speed v of the sheet a can be obtained from the frequency of this pulse. In FIG. 9, the reference numeral 24 ′ indicated by an imaginary line is the panel 2
The defect detection device 24a, which detects a defective portion from the signal of the camera, and the speed detection means PE by the control device incorporated in the control unit 4.
Counter 24 for counting pulse signals from the
b and an arithmetic unit 24c.

In FIG. 8, a point O directly below the detecting means 44 is shown.
When a defective portion is found in No. 1, in order to put a label on the defective portion at the operating position O2 of the labeler 50 which is separated from the point O1 by the distance L, the labeler 50 receives the operation command and rotates the lever 50b. The distance ΔL traveled by the sheet a within the mechanical operation time Δt required to attach the label is calculated, and when the defective portion reaches the position L−ΔL, the point O3, the labeler 50 is instructed to operate. Must be done. By the way, this ΔL can be expressed as ΔL = vΔt since the speed of the sheet a is v and the operation time is Δt. Further, Δt is a unique numerical value that the labeler 50 has. Therefore, if only v is obtained from the pulse signal from the speed detecting means PE, ΔL can be easily obtained, and the label can be accurately attached to the defective portion position.

Actually, as shown in FIG. 9, when the defect detecting device 24a detects a defective portion, the pulse signal from the speed detecting means PE is started to be counted by the pulse counter 24b in the control device, and the label is calculated by the arithmetic device 24c. 50 operating time Δ
By calculating how many pulses are included during t, L
-[Delta] L is calculated and an instruction is given to the labeler 50.

When the label indicating the defective portion position on the printing is attached in this way, the apparatus is once stopped, and then it is reversed to return the labeled portion of the sheet a to the worktable 49 to remove the defective portion. To do.

10A and 10B are diagrams showing the detailed construction of the workbench 49. FIG. 10A is a top view and FIG. 10B is a front view. Work table 49
Are guide rollers 37, 3 on the left and right sides of the central base plate 49a.
8 and the upper surfaces of the guide rollers 37 and 38 are base plates 49a.
The sheet a is slightly higher than the upper surface of the sheet, and the sheet a does not touch the base plate 49a when the normal sheet a is being fed.

A V-shaped groove 49b for cutting is formed in the center of the base plate 49a, and guide rollers 37,
38, there are presser bars 49c, 49c each longer than the width of the sheet a, and the presser bar 49c is usually located above the base plate 49a and spaced apart from each other, and a push button (Fig. By pushing (not shown), the fluid cylinders 49d connected near both ends are operated so that the pressing bar 49c abuts the base plate 49a. Further, as shown in FIG. 10B, a label detecting means 49e is provided on the right side of the work table 49. The fluid cylinder 49d may be an air cylinder, a hydraulic cylinder, or the like, and a solenoid may be used instead of the fluid cylinder.

FIG. 11 shows the sheet a near the defective portion D. A label b2 is attached to a position corresponding to the defective portion D at the end of the sheet a. a'1, a'2, ...
Each frame of the pattern printed on the sheet a is shown, but it is assumed that the frame a'2 has a defective portion D.

When the label b2 is applied as described above, the apparatus is stopped and subsequently reversed. When the label detecting means 49e detects the label b2, the defective portion D corresponding to the label b2 is placed on the base plate 49a and the apparatus stops. Then, the worker first aligns the line s ₁ on the left side of D with the cut groove 49b and turns the switch 49f. The fluid cylinder 49d operates to press the holding bars 4 on both sides.
9c is lowered and the sheet a is pressed onto the base plate 49a. Then, the worker cuts the sheet a along the line s _{1 with} a cutter or the like. Next, the switch 49f is turned in the opposite direction to raise the pressing bar 49c, and the sheet a on the right side of s ₁ is pulled by hand or the like, and the appropriate line s ₂ on the right side of the defective portion D is aligned with the cut groove 49b. , The pressing bar 49b is lowered by pressing the switch, and the sheet is cut along the line s ₂ to remove the sheet a containing the defective portion D. Then, the sheets on both sides are overlapped as shown in FIGS. 11 (b) and 11 (c), and the patterns are matched with each other and connected by a tape T (when the sheet a is used as a wrapping sheet, the tape T is attached. Is not used). After that, the sheet a is fed in the forward direction (direction in which the take-up reel 26 winds), and the next defective portion is examined.

When the sheet a on the supply reel 25 side is wound up to the end on the take-up reel 26 as described above, the investigation of the defective portion is completed. Then, this time, the motor on the supply reel 25 side is driven to reverse the supply reel 25, and the sheet a of the take-up reel 26 is rewound on the supply reel 25. At this time, the first edge adjusting device including the edge detecting devices 41 and 42 and the swing frame 22 described above and the second ear are arranged so that the edges of the cylindrical body A formed by rewinding are aligned. The end adjustment device 48 performs the adjustment in two stages.

FIGS. 12 (a) to 12 (c) show the edge detection device 4
It is a figure explaining 1,42. Edge detection device 41, 42
Are of the same structure and are provided on the left and right sides of the sheet a, emit spot light, receive reflected light from the subject, and detect the edge position of the sheet a by detecting the intensity of the reflected light. It is a thing.

As shown in FIG. 12B, the edge detecting device 4
1, 42 from the sheet a on the guide rollers 29, 28
The distance is set to about mm, and the projection spot S is set so as to reach the edge of the sheet a by about half as shown in (c). Alternatively, the pattern printed on the sheet a such as the spot S ′ is set so as to cover about half the pattern. Then, the intensity of the reflected light from the spots S and S'is measured to detect the position of the edge. When the position of the edge is displaced to the right or left from the position shown in (c), the edge detectors 41 and 42 detect the displacement due to the difference in the amount of received light, and the control device in the panel 24 causes the swing frame to move. Instructed by 22, the swing frame 22 is moved in the direction perpendicular to the paper surface to correct the deviation.

The deviation can be corrected even when the cylindrical body A of the supply reel 25 is wound by the take-up reel 26.
When the film is rewound from the take-up reel 26 to the supply reel 25, more accurate correction can be made. In other words, in the case of "winding", when a defective part is found in the inspection, it stops, and it reverses to delete the defective part and restarts operation, so there are many times of running and stopping, and tension applied to the seat each time. Is suddenly changed, and meandering is likely to occur. Further, when the meandering occurs, it is corrected by the edge adjusting device, but a follow-up time until correction is required, and “rewinding” without such a situation is easier to correct.

FIG. 13 is a perspective view showing the structure of the second edge adjusting device 48, and FIGS. 14 (a) and 14 (b) are views for explaining the operation. As shown in FIG. 13, the edge adjusting device 48 has guide rollers 35 and 36 fixed in parallel on both sides of a frame 48a, and a drive means 48b composed of an air cylinder (or a hydraulic cylinder) may be provided below the frame. ing. As shown in FIG. 14 (b), the rod 48c of the driving means 48b rotates the guide roller 35, 36 while keeping the guide rollers 35, 36 in a parallel state, and rotates the sheet a as shown by an arrow mark. Is moved from the position of the solid line to the position of the virtual line.

Reference numeral 48d denotes an edge detecting device, which may be the same as the edge detecting devices 41 and 42 shown in FIG. The illustrated embodiment is a capacitive type, and the edge is detected by utilizing the fact that the electric capacitance between the electrodes sandwiching the sheet a changes with the change of the position of the sheet a.

In the apparatus of the present invention, the first and second ear edge adjusting devices are used, but the second ear edge adjusting device located farther from the reel 25 performs coarse adjustment and the one closer to the reel is used. Fine adjustment is performed by the first edge adjusting device, so that the edges can be aligned with higher accuracy than ever before.

If the end surfaces of the reels before the inspection are not aligned or if the end portions are wrinkled by containing water,
Since it is easy to meander, it is desirable to adjust the edge of the ear during both winding and rewinding. When adjusting during winding,
Rough adjustment is performed by the first edge adjusting device, and fine adjustment is performed by the second edge adjusting device.

[0052]

As described above, according to the defective portion inspection apparatus for an endless sheet of the present invention, when the detection means finds a defective portion, the delay time for issuing an instruction to the labeler according to the sheet feeding speed is set. Because it can be controlled, labels can be accurately attached to defective areas regardless of the speed of the sheet. Further, since the inspection does not depend on the naked eye, the inspection can be performed even if the sheet speed is high, and since the label is attached, it is easy to find the defective portion when deleting the defective portion.

Further, if the electronic camera is provided, the structure is simplified and inspection can be performed without touching the seat. Further, if the label is attached in a state of protruding from the end of the sheet, the presence or absence of the defective portion and its position can be easily known even after the sheet is rolled up.

[Brief description of drawings]

FIG. 1 is a front view showing an overall configuration of an apparatus for processing a cylindrical body, that is, an apparatus for eliminating defective printing portions.

FIG. 2 is a top view showing a configuration of a cylindrical body supply device.

FIG. 3 is a front view similar to FIG. 1, showing a configuration of a cylindrical body supply device.

FIG. 4 is a side view showing a configuration of a supply device for a cylindrical body.

FIG. 5 is a diagram showing a configuration of an apparatus for feeding a sheet at a constant speed.

FIG. 6 is a diagram showing a configuration of an apparatus for eliminating defective printing points.

FIG. 7A is a front view showing the structure of a labeler, and FIG. 7B is a perspective view showing the structure of a labeled tape.

FIG. 8 is a diagram schematically showing the relationship between a seat, a camera, and a labeler.

FIG. 9 is a block diagram of a system for generating a sticker to labeler signal.

10A and 10B are diagrams showing a detailed configuration of a work table 49, where FIG. 10A is a top view and FIG. 10B is a front view.

FIG. 11 is a diagram showing a sheet in the vicinity of a defective portion D, where (a) is a state before removal of the defective portion, (b) is after removal, and (c) is a front view of (b).

FIG. 12 is a diagram of an edge detection device, (a) is a perspective view of the detection device, (b) is a diagram for explaining setting of the detection device, and (c).
FIG. 6 is a diagram illustrating a positional relationship between a spot and a sheet.

FIG. 13 is a perspective view showing a configuration of an edge adjusting device.

14 (a) and 14 (b) are views for explaining the operation of the edge adjusting device.

FIG. 15 is a front view showing a configuration of a conventional cylindrical body processing apparatus, that is, an apparatus for eliminating defective printing portions.

16 is a diagram showing details of a workbench and a press bar in the apparatus of FIG.

[Explanation of symbols]

 A cylindrical body a sheet PE speed detecting means Δt operating time a′1, a′2 ...... frame b2 label 44 detecting means (electronic camera) 50 labeler 24 ′ control device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Umehara 212-1, Kuze Tsukiyama-cho, Minami-ku, Kyoto City, Japan Tobacco Inc. Printing Technology Development Center (72) Inventor Koichi Ozaki, Kuse Tsukiyama-cho, Minami-ku, Kyoto 212-1 Japan Tobacco Inc., Printing Technology Development Center (72) Inventor Shinzo Tonami Kuse Tsukiyama-cho, Minami-ku, Kyoto 212-1 Japan Tobacco Inc. Printing Technology Development Center (72) Inventor Shinichi Ueda 351 Hashikawa-cho, Fushimi-ku, Fushimi-ku, Kyoto Inside the Kansai Plant of Japan Tobacco Inc. (72) Inventor Ikuo Fujiyoshi 568 Shizuri-cho, Ogaki-shi, Gifu Higashi Shinnai Co., Ltd. (72) Inventor Rihiro Mizobuchi Takamatsu, Kagawa 1217 Hayashi-cho, Ichi within Hutech Co., Ltd.

Claims (3)

[Claims] 1. A detection unit for detecting a defective portion of a sheet flowing in one direction, a speed detection unit for measuring the speed of the sheet, a labeler arranged downstream of the detection unit in the sheet flow direction, and a control device. And, the control device, to the labeler after a lapse of a delay time calculated from a signal for detecting a defective portion from the detection means, a speed signal from the speed detection means, and a mechanical operation time of the labeler. A device for inspecting a defective portion of an endless sheet, which gives an instruction and attaches a label as a mark of a defective portion to the sheet. 2. The endless sheet has a surface on which the same pattern is repeatedly drawn, and the detection means is an electronic camera, and the camera sequentially and continuously photographs a certain length of the sheet, and the front is photographed. 2. The apparatus for inspecting a defective portion of an endless sheet according to claim 1, wherein when the two images of the taken image and the image photographed next do not match, one of them is determined as a defective portion. 3. The label is attached in a state in which the labeler projects from an end portion of the sheet.
Alternatively, the device for inspecting a defective portion of the endless sheet according to item 2.