JPH0720797B2 - Single sheet sorting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention detects a defect present on the surface or layer of a sheet of paper, synthetic resin film, non-woven fabric, woven fabric, etc. The present invention relates to a sorting device that continuously and automatically removes leaf sheets.

(Prior Art) Prior to shipping a sheet as a product, it is necessary to select and remove the sheet having a defect such as a flaw, dirt, and foreign matter mixed therein.

Taking paper as an example, usually, in the papermaking process, the defective portion detected by the online defect detection device is wound while marking the widthwise end portion, and this defective portion is wound by a winder or a cutter. It is removed when the paper roll is divided into small rolls or cut into sheets. However, in general, in the finishing process, a worker visually selects fine defects that cannot be detected online, and rejects defective products.

For this reason, an apparatus has been proposed in which a sheet is sandwiched between a pair of upper and lower belts and automatically conveyed to sort the sheets.

(Problems to be Solved by the Invention) However, since the above-described conventional device inspects the sheets one by one with the defect detection device, at the inspection location, the so-called free-run of the belt does not restrain the sheet in the width direction because the belt is interrupted. As a result, the seat may be laterally displaced due to air resistance, and subtle vibrations and ups and downs may occur. As a result, the detection accuracy of the defect detector is impaired, causing erroneous detection, and the reliability of the sorting apparatus has been questioned.

(Means for Solving the Problem) The present invention is to solve the problems of the above-mentioned conventional device, and the single-wafer sheet sorting device according to the present invention is a single-wafer sheet stacked with a large number of sheets. A feeding device for feeding one by one,
A conveying device that sequentially conveys the sheet fed from the feeding device by a belt, a plurality of defect detecting devices arranged in a traveling path of the sheet traveling by the belt, and a defect detecting device from these defect detecting devices. In the sheet-fed sheet sorting apparatus, which includes a defective sheet-fed sheet removing device that receives the defect signal and removes the defective sheet-fed sheet out of the system of the traveling path, and a stacking device that stacks the accepted sheet-fed sheets, In the device, the traveling path is divided into at least two stages, a front stage and a rear stage, and the traveling route of each stage is vertically and confronted with each other,
A plurality of narrow endless rotating belts are installed in parallel along the traveling path at intervals, and further, the endless rotating belt group is provided with a continuous portion of at least steps. One of them is arranged in a zigzag pattern, and the plurality of defect detection devices install the single-wafer sheet that is running at least in each of the steps located before and after the zigzag continuous portion as an inspection field of view. It is characterized by being.

(Operation) In the single-wafer sheet sorting apparatus according to the present invention, the traveling path is divided into at least two portions, the front stage and the rear stage, and a plurality of narrow endless rotations are provided above and below the traveling route of each stage. A belt group in which belts are laid across in parallel at a distance along a traveling path is installed so as to face each other vertically. Therefore, the sheet is conveyed along the traveling path while being sandwiched between the upper and lower belt groups, but the endless rotary belt has the staggered arrangement of the continuous portions between the stages, so the front stage to the rear stage or the front stage. At the same time from the shift to the interruption, the position where the belt presses the sheet moves, and the sheet is pressed at a position different from the previous stage.

Therefore, the defect detection device provided in each of the front and rear stages can set a portion where the sheet is not covered with the belt group in each stage as a main inspection visual field. As a result, by operating at least the front and rear two-stage defect detection devices, a portion that cannot be inspected because it was covered by the belt group at the front stage can be inspected at the rear stage where the position of the belt group changes. Therefore, the entire surface of the single-wafer sheet can be thoroughly inspected.

(Example) Below, this invention is demonstrated based on drawing which shows an Example.

FIG. 1 is a front view of a single sheet sorting apparatus according to the present invention, and FIG. 2 is a plan view showing an upper belt group of the conveying apparatus in FIG. In the figure, the single sheet sorter is a feeding device.
10, a conveying device 20, a defect detecting device 30, a defective sheet eliminating device 50, and a passing sheet stacking device 60.

First, in the feeding device 10, the single sheets 1 to be inspected are stacked on the built-in pallet 12. The individual sheets 1 are successively sent out one by one onto the slider 13 from the uppermost one by the sending roll 15. Slider
Reference numeral 13 includes a narrow belt group 16 and a roll group 17, and sends the sheet 1 to the conveying device 20 in the next step. The delivery speed at this time is linked to the set speed of the transport device 20 via the variable speed device 25. An air adsorption type delivery device may be used instead of the delivery roll 15.

The transfer device 20 is divided into a front stage part and a rear stage part, and each stage has a belt group 23a, 23b, 23 facing each other up and down across the traveling path.
It has c and 23d. Each belt group is composed of a plurality of narrow endless rotating belts that are arranged in parallel at a distance from each other and can rotate as if they were one belt. . That is, in the front stage, four narrow upper belt groups 23a spanned by the upper roll group 21a,
Similarly, four narrow lower belt groups 23b, which are also bridged over the lower roll group 21b, face each other in the running path and rotate in the same flow direction at the same speed to sandwich the sheet 1 from above and below. It can be transported while doing. Similarly in the latter stage, there are three narrow upper belt groups 23c spanned by the upper roll group 21c and three narrow belt groups 23d similarly spanned by the lower roll group 21d. By facing the traveling path and rotating in the same flow direction at the same speed, the sheet 1 can be conveyed while being sandwiched from above and below. Of course, the number of belts forming each belt group may be arbitrary.

FIG. 2 is a plan view showing a belt group of the conveying device 20 according to the present embodiment, and includes four belts 81, 82, 83, 84 forming the upper belt group 23a in the front stage and the upper belt in the rear stage. The three belts 85, 86, 87 forming the belt group 23c are arranged in a staggered manner. In other words, the front upper belt group 23a and the rear upper belt group 2
The rolls 88 located at the boundary are shared with the 3c, and the rolls are bridged over the portions where the belts of the other party are not hung on each other.
The relationship between the front lower belt group 23b and the rear lower belt group 23d is exactly the same.

Therefore, the single-wafer sheet 1 has the belt group 23a,
When conveyed while being sandwiched by 23b, a part of the front and back surfaces of the sheet 1 is hidden at the position where the belt hits. However, in the latter stage, the belt groups 23a, 23d are replaced by the former belt groups 23a, 23b. Since the sheet 1 hits the sheet 1 at the shifted position, the sheet 1 is concealed by the belt in the latter part, which is different from the former part. In this way, the same portion of the single-wafer sheet 1 will not be hidden by the belt through the front stage and the rear stage.

Now, in FIG. 1, in addition to the above, the transfer device 20 includes
A guide plate 22 that supports the belt group of the traveling path from below to prevent bending is provided so as to avoid the inspection location, and a driving device 24 that rotates the belt group and operating conditions such as the operating speed of the driving device 24. A drive control device 71 for controlling the motor is attached.

Next, the defect inspection unit 30 corresponds to each of the former stage and the latter stage of the conveying device 20 described above, and in the former stage, a set of the detector 31a and the light source 32a for the lower face of the single-wafer sheet 1, and similarly for the upper face. Is provided with a set of a detector 31a and a light source 32b.
Set of detector 31c and light source 32c for the upper surface, detector for the lower surface
A set of 31d and a light source 32d is provided. These detectors and light sources are belt groups 23a, 23b,
The sheet 1 is sandwiched between 23c and 23d and is disposed so as to be sandwiched from above and below with respect to the sheet 1 that is traveling. Therefore, the defect inspection of the single-wafer sheet 1 can be performed in each of the front stage and the rear stage.
As the detectors 31a, 31b, 31c, 31d, CCD type detectors are generally used, and as the light sources 32a, 32b, 32c, 32d, a reflection / transmission combination type consisting of a pair of reflection light sources and transmission light sources is used. Is desirable. The defect signals transmitted from the detectors 31a, 32b, 31c, 31d are sent to the data processing device 73 through the defect inspection control device 72 and processed there.

In the above-mentioned embodiment, the traveling path is divided into the front stage and the rear stage. However, it does not matter if it is divided into three or more stages. In that case, at least one of the continuous parts of the respective stages is used. It suffices that the belt groups are arranged in a staggered manner at each position, and that the defect detection device is installed at least at each of the steps located before and after the continuous portion arranged in a staggered manner.

FIG. 3 and FIG. 4 are explanatory views of the inspection visual fields in the front stage and the rear stage of the transfer device 20 according to the embodiment shown in FIG. 1, respectively. As shown in FIG. 3, the inspection visual field can be obtained by a method in which the detector 31b inspects the sheet 1 in a wide visual field including four upper belt groups 81, 82, 83, 84, or FIG. As shown in, the detector 31c is a method for inspecting a narrow field of view that does not include the three upper belt groups 85, 86, 87, and in any case,
The front and back surfaces of the traveling sheet 1 are continuously inspected.

In the present invention, the detectors 31a, 31b, 31c, 31d can be used even when the belt is in the inspection field of view as shown in FIG.
It is possible to prevent the defect inspection from being affected by preliminarily treating the belt portion within the visual field of 1) by means such as electronic masking.

Further, the edge portions in the width direction and the flow direction of the single sheet 1 are also detected by the detectors 31a, 31b, 31c, 31d, and the position of the single sheet 1 to be inspected in the inspection field of view itself. , Is automatically recognized by the defect inspection control device 72.

The quality of the sheet 1 is determined by the first sheet 31a from the first detector 31a for defects such as foreign matter, dirt, holes, avoidances, wrinkles, and streaks in the upper and lower surfaces of the sheet 1 and its layers. The density of defects detected by each detector before passing through the detector 31d, the size, the number of defects, etc. are collectively calculated by the defect inspection control device 72, and the result is preset as a defect. A good product and a defective product are discriminated by comparing with the judgment level. The accuracy of this pass / fail judgment is further improved by combining the types of detectors, and it becomes possible to detect even minute objects that were difficult to detect in the past.

In this way, for the sheet determined to be defective, the sheet size and the sheet interval are matched based on the signal from the position sensor 33 provided on the last detector 31d and the belt groups 23c and 23d. The removal timing outside the system is calculated, the switching device 38 is switched downward by this rejection signal, and it is forcibly rejected by the rejection conveyor 51 to the movable defective sheet recovery box 52 standing by therebelow.

On the other hand, the accepted sheet goes straight through the conveyor 20 and reaches the final conveyor.
It is automatically loaded onto a pallet 62 provided on the stacking device 60 by 61.

It should be noted that when inspecting a particularly lightweight sheet at a high speed, there is a possibility that the sheets may be overlapped in a bent state, so that the overlap device 40 may be attached. The overlapping device 40 is intended to realize proper stacking by transporting each sheet while placing the leading edge on the trailing edge of the preceding sheet, and the upper conveyor 41 and the first lower conveyor 42. , The second lower conveyor 43, the vacuum suction device 44, the speed change device 45, and the control device 75. The overlap by the overlap device 40 sets a speed difference between the first lower conveyor 42 and the second lower conveyor 43 according to the size of the sheet by the transmission 45, and the position sensor 46 detects the passage of the sheet. This is performed by a method of detecting and stopping the sheet on the vacuum suction device 44, and superimposing the leading edge of the sheet to be followed at this time.

The number of passed sheets and the number of defective sheets are respectively counted, and the types, numbers and positions of all the defects detected by the defect detection device are statistically processed by a computer. Necessary data processing is performed by the data processing device 73 based on these information, displayed on the CRT 76 in real time and printed out as needed, and provided as materials for operation management, quality control, production control, form preparation, etc. To be done.

(Effects of the Invention) According to the present invention, a wide range of single-wafer sheets can be inspected at the time of paper, synthetic resin film, non-woven fabric, and woven fabric,
During pass / fail selection, the sheet to be inspected is firmly sandwiched between the upper and lower belt groups that are traveling, and sheet defects are detected in the stable conveyance process, making it possible to detect minute defects. Highly accurate and accurate sorting work can be performed stably.

In addition, it is possible to improve and abolish the manual selection work by the operator's visual inspection, which is said to have a large physical burden and has an individual difference in the inspection result, and to speed up and automate.

[Brief description of drawings]

FIG. 1 is a front view of a sheet separating apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view showing an upper belt group of the conveying apparatus in FIG. FIG. 3 and FIG. 4 are explanatory views of the inspection visual fields at the front stage and the rear stage of the transfer device in FIG. 1, respectively. 1 ... Single sheet, 10 ... Feeding device, 20 ... Conveying device,
23a, 23c …… Upper belt group, 23b, 23d …… Lower belt group, 24…
... Drive motor, 30 ... Defect inspection device, 31a, 31b, 31c, 31d
...... Detector, 32a, 32b, 32c, 32d …… Light source, 38 …… Switching device, 40 …… Overlap device, 50 …… Defective sheet eliminating device, 52 …… Defective sheet collection box, 60 …… Passed paper Stacking device.

Claims (1)

[Claims] 1. A feeding device that feeds a plurality of stacked sheet one by one, a conveying device that sequentially conveys the sheet fed from the feeding device by a belt, and a traveling by the belt. A plurality of defect detection devices arranged on the traveling path of the sheet, and a defect sheet excluding device for receiving the defect signals from these defect detection devices and excluding the defective sheet out of the system of the traveling path. And a stacking device for stacking the passed single sheets, in the single-sheet sorting device, the transport device divides the traveling path into at least two stages, namely, a front stage and a rear stage, and the traveling route of each stage. A plurality of narrow endless rotating belts are installed above and below and in parallel with each other, and are arranged in parallel along the traveling path at intervals, and further, the endless rotation belt is installed. At least the belt group One of the mutual continuous portions is arranged in a zigzag manner, and the plurality of defect detection devices detect the sheet that is running at least in each of the steps located before and after the zigzag continuous portion. A single sheet sorting apparatus, which is installed as an inspection field of view.