JPH10194585A - Flat sheet automatic sorting equipment - Google Patents

Abstract

(57) [Summary] In the case of an automatic sorting apparatus, a flat sheet detection surface is required for a sheet defect detection unit, but in the conventional method, the defect detection unit releases the paper from the belt. Therefore, there is a problem that the sheet flaps and the detection accuracy is not sufficiently obtained. The present invention relates to a sheet feeder for intermittently feeding sheet sheets cut and stacked in a sheet shape, and a reflection light type for detecting a defect on a surface of the fed sheet. A first defect detection device including a defect detector, a suction belt and a suction box, a reflected light type defect detector for detecting a defect on the back surface of a sheet, and a second defect detection including a suction belt and a suction box Device, a transmission-type third defect detection device, a defective paper accumulation unit, a good paper accumulation unit, and receives a detection signal from each defect detector.
A flat sheet automatic sheet sorting apparatus characterized in that defective sheets of a sheet are sorted and discharged to a defective sheet stacking section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a defect in a sheet (hereinafter referred to as a "sheet") cut and stacked in a sheet form continuously and automatically, and continuously detects a defective sheet. The present invention relates to a flat sheet automatic sheet sorting apparatus for sorting.

[0002]

2. Description of the Related Art As a method of sorting sheets, a sheet machine or a coater detects a defect, a marked portion is cut and eliminated, and then the vicinity of the sheet is inspected by human eyes. It is a target. In addition, as an automatic sorting device,
Sheets are continuously fed, conveyed by sandwiching between upper and lower belts arranged in two rows, and various detectors provided above and below these conveying devices are installed to detect defects and detect defective products. A device for discharging the gas to the outside of the system is described in Japanese Patent Publication No. 7-20797. Since this device clamps the sheet with the upper and lower belts, the clamped portion cannot be detected. Therefore, the upper and lower belts are provided in a plurality of stages, and a plurality of detectors are arranged to detect a defect. It supplements the detection of parts. Japanese Patent Application Publication No. 6-74112 discloses an apparatus that always holds and transports a sheet with a gripper, and detects defects using various defect detectors on a detection cylinder in the middle of the conveyance.

[0003]

In the case of an automatic sorting apparatus, a flat sheet detection surface is required for the sheet defect detection unit. However, in the conventional method, the defect detection unit releases the paper from the belt. Therefore, there is a problem that the sheet flaps and the detection accuracy is not sufficiently obtained. SUMMARY OF THE INVENTION It is an object of the present invention to provide a flat-sheet automatic sheet sorting / detection apparatus which allows a sheet to pass through a detection unit while keeping the sheet flat, thereby enabling highly accurate defect detection.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided a paper feeder for intermittently feeding sheet sheets cut and stacked in a sheet shape, and for detecting a defect on the surface of the fed sheet. Reflected light type defect detector, a first defect detection device comprising a suction belt and a suction box, a reflected light type defect detector for detecting a defect on the back surface of the sheet,
It has a second defect detection device including a suction belt and a suction box, a transmission-type third defect detection device, a defective paper accumulation section, and a good paper accumulation section. A flat sheet automatic sheet sorting apparatus characterized in that defective sheets of leaf sheets are selected and discharged to a defective sheet stacking section.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a sheet fed from a sheet feeder is conveyed by upper and lower conveying belts, but there is no upper belt at a detecting portion and a lower portion of a lower suction belt is provided. The suction box is placed at the bottom, and the sheet is conveyed while maintaining the flatness in the inspection section, while the sheet is conveyed while sucking the sheet to the lower suction belt. Since defects such as streaks and wrinkles on the paper surface are detected, the defects can be detected with high accuracy. In addition, the transmission type defect detector detects holes, dirt (black spots) and the like in a sheet, inputs defect signals of these defect detectors to a control device, and sets a defect set value previously input to the control device. Compared with the above, the sorting gate for defective sheets can be switched automatically by the output signal of the control device that has judged the good or bad of the sheet, and the sorting of the flat sheet can be automatically performed with high accuracy. is there.

A flat sheet automatic sheet sorting apparatus of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic side view of a flat sheet automatic sheet sorting apparatus according to the present invention, FIG. 2 is an enlarged schematic view of a defect detection unit, and FIG. 3 is an enlarged schematic view showing the relationship between the first to third defect detection apparatuses. FIG. 4 is a schematic view of a sheet sorting section. The flat sheet automatic sheet sorting apparatus according to the present invention includes a sheet feeding device, a first defect detection device, a second defect detection device, a third defect detection device, a defective paper accumulation section, a good paper accumulation section, and a control device. It is composed.

In FIG. 1, a paper feeder 1 continuously feeds sheets 2 stacked on a lifter 3 to a paper feed conveyor 5 one by one by a feed roll 4. On the sheet feeding conveyor 5, the sheet 2 positioned by the side aligning device 6 is sent to the first defect detecting device.

In the first defect detection device, a defect detector comprising a light source 7 and a light receiver 8 is installed above an inspection section, and the conveyance of the sheet 2 to the inspection section is performed by belts provided above and below. However, the upper belts 9 and 11 are arranged before and after, except for the inspection unit. As the lower belt, a perforated suction belt 13 is used, and a suction box 17 is disposed at a lower portion corresponding to an inspection unit.

The upper belt 9 is an endless belt spanned by a plurality of guide rolls 10. In FIG. 1, an upper belt 11 is an endless belt made of a perforated suction belt, and has a plurality of guide rolls 12 and tension rolls 19.
And a reversing roll 18, and has an integral structure which also functions as a suction belt below the second defect detection device, but is divided into upper belts (in this case, upper belts) of the first defect detection device. It is not necessary to use a suction belt) and the lower belt (suction belt) of the second defect detection device can be used. The suction belt 13 is an endless belt laid over a plurality of guide rolls 14, a tension roll 15, and a reversing roll 16.

The lower belt 13 of the first defect detection device does not have to be a full-width suction belt. In this case, a plurality of endless belts having a width of about 75 mm may be wrapped according to the paper width. In order to prevent the generation of wrinkles in the sheet 2, suction is alternated in the width direction before and after the inspection section, and the belts are closed by members of the same thickness. A paper guider 46 is attached except for the inspection section in order to suppress the lifting of the sheet 2 at that portion.

Sheet 2 conveyed to the first defect detection device
Is transported to the inspection section by the upper belt 9 and the suction belt 13, where the sheet 2 is lightly sucked by the suction belt 13 and flattened by the suction force of the suction box 17 provided below the suction belt 13. It is held and passes through the inspection unit. The upper belt 9 turns in front of the inspection section, and the upper surface of the inspection section is configured to provide a sufficient space for inspecting the surface of the sheet 2.
In the inspection unit, light is applied from the light source 7 at a low incident angle, the reflected light is received by the light receiver 8, and the signal is input to the control device 47. The sheet 2 that has been inspected by the inspection unit is conveyed by the upper belt 11 and the suction belt 13, nipped by the reversing roll 16 and the upper belt 11, conveyed inverted, and sent to the second defect detection device.

The second defect detection device has basically the same configuration as the first defect detection device, and the sheet 2 reversed by the reversing roll 16 at the exit of the first defect detection device. Is to be inspected.

FIG. 2 shows a structure in which the second defect detection device is arranged below the first defect detection device in order to shorten the installation length of the entire selection device. If there is room, it may be arranged in series. In this case, the reversing roll 16 is not necessary, and the mounting position of the defect detector may be located on the lower side and the suction box 25 may be located on the upper side. The upper belt for conveyance of the second defect detection device is replaced by a suction belt 13 which is a lower belt of the first defect detection device. As described above, the suction belt of the second defect detection device is replaced by the upper belt 11 of the first defect detection device. The upper belt 20 in the latter half of the inspection unit of the second defect detection device is an endless belt laid over a plurality of guide rolls 21 and tension rolls 22.

The inverted sheet 2 includes an upper belt (a suction belt 13 of the first defect detecting device) of a second defect detecting device and a suction belt (a second half of the first defect detecting device) serving as a lower belt. The sheet is nipped by the upper belt 11) and transported to the detection unit. In the inspection section, the sheet 2 is held flat by suction of a suction box 25 provided below the suction belt 11 and passes through the inspection section. In the meantime, light is applied from the light source 23 at a low incident angle, the reflected light is received by the light receiver 24, and the signal is input to the control device 47. The sheet 2 which has been inspected by the inspection unit is conveyed by the upper belt 20 and the suction belt 11 in the latter half, reversed by the reversing roll 18 and sent to the third defect detecting device.

The third defect detecting device comprises a transmission type detector in which a light source 26 and a detector 27 are arranged above and below a passage portion of the sheet 2. The sheet 2 reversed by the reversing roll 18 is sandwiched between the upper belt 20 and the lower belt (suction belt 11) of the second defect detection device and conveyed to the third detecting unit. The slit light from 26 is irradiated, the light is detected by the detector 27, and the measurement signal is input to the control device 47 to determine a hole, dirt (black spot) and the like of the sheet 2. The sheet 2 that has passed through the third detection unit is nipped by the upper belt 28 and the lower belt 30 and is transported to the next. The upper belt 28 is an endless belt spanning a plurality of guide rolls 29. The lower belt 30 is an endless belt spanning a plurality of guide rolls 31 and tension rolls 32. Note that the third defect detection device may be provided before the first defect detection device.

The quality of the sheet 2 is determined by detecting streaks, wrinkles, and the like on the front surface of the sheet 2 with the first defect detection device, and detecting streaks and wrinkles on the back surface of the sheet 2 of the second defect detection device. Wrinkles and the like are detected, holes and dirt (black spots) are detected by the third defect detection device, and a detection signal from each defect detection device is transmitted to the control device 4.
7, the result is compared with a judgment level preset in the control device 47 to determine the acceptability of the sheet 2, and the result signal is sent to the distribution gate 33.

If the sheet 2 is completely defect-free, the sheet 2
a is determined. When there are defects such as streaks, wrinkles, and stains (black spots) on the paper surface, the control device 47 counts the size by the number of pixels, and processes the content at high speed.
If the result is equal to or higher than the level set for each type of defect, the sheet 2 is determined as a defective sheet 2b.

The sorting gate 33 is attached to the tip of the lower belt 30. In the case of good paper 2a, the sheet 2 passes over the upper surface of the sorting gate 33. When the distribution gate 33 receives the signal of the defective paper 2b, the distribution gate 33 rises just before the defective paper 2b passes, and the defective paper 2b is conveyed by the lower belt 34 while hitting the lower part of the distribution gate 33, It is dropped on the deposition section 35.

After passing the sorting gate 33, the good paper 2a is again sandwiched between the upper and lower endless belts 36 and 37 and conveyed to the good paper stacking section 41. Therefore, an overlap mechanism for stacking the good paper 2a during the conveyance is provided.

In the overlap mechanism, a part of the good paper 2a is sucked into the suction box 38 and
At 9, the paper is decelerated, transported by the low-speed belt 40, and deposited on the good paper deposition section 41. The number of good papers 2a is measured by a counter, and a tape is inserted every predetermined number. The good paper stacking section 41 is for accumulating the good paper 2a on the lifter 42. In order to properly align the good paper 2a, the side jaguar 43, the front jaguar 44 and the sheet stopper 45 are provided.
Is provided.

The number of good papers 2a and defective papers 2b are automatically calculated, and can be displayed on a display as data of each pallet, time, day, or the like, or output by a printer.

[0022]

According to the present invention, the inspection of the front and back surfaces is performed accurately while the sheet is conveyed accurately one sheet at a time and held flat, and the transmitted light inspection is performed. High sorting work can be performed at high speed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a lithographic sheet-fed automatic sorting apparatus according to the present invention.

FIG. 2 is an enlarged schematic diagram of a defect detection unit.

FIG. 3 is an enlarged schematic diagram showing a relationship among first to third defect detection devices.

FIG. 4 is a schematic view of a sheet sorting section.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper feeder 2 sheet 2a good paper 2b defective paper 3 lifter 4 feed roll 5 paper feeder 6 side aligner 7 light source 8 light receiver 9 upper belt 10 guide roll 11 upper belt (suction belt) 12 guide roll 13 suction Belt 14 guide roll 15 tension roll 16 reversing roll 17 suction box 18 reversing roll 19 tension roll 20 upper belt 21 guide roll 22 tension roll 23 light source 24 light receiver 25 suction box 26 light source 27 detector 28 upper belt 29 guide roll 30 lower belt REFERENCE SIGNS LIST 31 guide roll 32 tension roll 33 sorting gate 34 lower belt 35 defective paper accumulation part 36 upper belt 37 lower belt 38 suction box 39 catch low 40 low-speed belt 41 good paper deposition portion 42 lifter 43 side Jaguar 44 Front Jaguar 45 sheet stopper 46 paper guider 47 controller

Claims (1)

[Claims] 1. A sheet feeding device for intermittently feeding sheet sheets cut and stacked into sheets, and a reflected light type defect detector for detecting a defect on the surface of the fed sheet. , A first defect detection device including a suction belt and a suction box, a reflected light type defect detector for detecting a defect on the back surface of a sheet, a second defect detection device including a suction belt and a suction box, transmission It has a third defect detection device of the type, a defective paper accumulation section, and a good paper accumulation section, receives a detection signal from each of the defect detectors, sorts out defective paper sheets, and discharges the sheets to the defective paper accumulation section. A flat sheet automatic sheet sorting apparatus.