JP3154932U - Toilet paper inspection device - Google Patents

Abstract

In order to detect the breakage of toilet paper, an inexpensive and responsive inspection apparatus using an LED and a phototransistor is provided. A phototransistor 4 is provided opposite to an LED light emitter 3 with a toilet paper sheet 1 moving in between, and the passed light is received by the phototransistor 4 and reacts according to the amount of light. Is used to detect damage anomalies according to the voltage level, and makes a stepwise distinction between paper, 2 sheets, 1 sheet, and 0 sheets, and the abnormality detection is set to the set voltage range according to the set voltage level. A tearing mode is detected and roll winding is instructed to stop. When the output voltage of the phototransistor 4 is stored at certain time intervals, and the difference between the stored value and the detected output voltage is equal to or greater than a specified value, it is determined as a candidate for damage, and the duration of the state where there is a difference greater than the specified value When a certain value exceeds a specified value, it is determined that there is a damage to be dealt with. [Selection] Figure 10

Description

The present invention relates to a toilet paper inspection apparatus for inspecting recycled toilet paper sheets and the like.

Conventionally, as a sheet inspection apparatus, there are a camera method, a detection method by irradiation with a fluorescent lamp, and the like.
As a camera system, there is a system (Japanese Patent Laid-Open No. 5-118996) in which the entire sheet width is inspected by photographing with a camera.
However, since the camera system has a limited angle of view, it is necessary to use a plurality of cameras when attempting to inspect the entire toilet paper sheet width, which increases the cost of the inspection apparatus.

There is also a line sensor type in the CCD line camera system.
The CCD line camera takes images while sequentially driving a number of CCD sensors arranged in a row according to the clock frequency (usually several MHz to several tens of MHz) of the camera. When the amount of image data to be processed becomes large and the traveling speed becomes high, the processing is delayed, and the possibility of omission of inspection increases because it cannot follow. Further, there is a problem that the cost increases if the processing is made in time.

Japanese Patent Laid-Open No. 5-118996

The present invention can deal with peculiar breakage even in the inspection of wide toilet paper sheets, and can perform a leak-free inspection over the entire width with an inexpensive device at high speed and responsiveness. It is an object to provide a toilet paper inspection device.

In order to solve the above-described problems, the present invention provides LED light emitters arranged at predetermined intervals in a line such as a line, and phototransistors arranged in a row so as to face each other with a toilet paper sheet moving in progress. The light passing through the toilet paper sheet 1 from the LED light emitter is received by the phototransistor, and the abnormality of the sheet corresponding to the magnitude of the voltage is detected by the voltage change measurement that reacts depending on the light amount. Is a toilet paper inspection device with a predetermined tear range.

This is a detection device that uses the fact that the output voltage varies depending on the amount of transmitted light depending on the thickness of the paper, makes a stepwise distinction between paper, 2 sheets, 1 sheet, and 0 sheets, and detects abnormality within a predetermined range.
In the detection device, an LED illuminant as a light source and a phototransistor as a sensor are arranged in the full width of an object to be inspected (recycled roll paper or the like).
In particular, the output of each phototransistor is short-circuited on the circuit to reduce the sensor output voltage determination circuit.

In order to make the abnormality detection within a predetermined range, the phototransistor output voltage is stored at certain time intervals, and if the difference between the stored value and the detected output voltage is greater than or equal to the specified value, it is considered as a candidate for damage, and further the specified value When the duration of the state with the above difference is equal to or greater than a predetermined value, the circuit configuration is such that it is determined that there is damage to be dealt with.

The toilet paper inspection apparatus according to the claims of the present invention is a toilet paper inspection apparatus for inspecting a sheet of toilet paper in the form of a wide recycled roll paper having light permeability, and is provided at regular intervals in a row. A phototransistor 4 is provided in a row so as to face the LED light emitter 3 and the toilet paper sheet 1 moving and moving, and the light that has passed through the toilet paper sheet 1 from the LED light emitter 3 is transmitted by the phototransistor 4. This is to detect a breakage abnormality of the toilet paper sheet 1 according to the magnitude of the voltage by measuring the voltage change that is received and reacts with the light quantity. By utilizing the fact that the output voltage changes depending on the transmitted light quantity depending on the thickness of the paper. , Paper, 2 sheets, 1 sheet, 0 sheets, and the abnormal voltage detection is set to the set voltage range. The toilet paper inspection apparatus is characterized in that a tearing mode corresponding to the thickness is detected and a roll winding is instructed to stop.

According to the magnitude of the voltage, the tearing mode is detected, and when the unsuitable winding is detected, the roll winding is instructed to stop.
The abnormality detection was specified as a specific range of tear paper peculiar to the toilet paper (it is not judged abnormal because a short one in the longitudinal direction can be used, but a long one is also abnormal in the longitudinal direction). This is another feature.

The detection principle is based on the fact that the output voltage changes depending on the amount of transmitted light depending on the thickness of the paper when detecting a breakage abnormality corresponding to the magnitude of the voltage by measuring the voltage change that reacts with the amount of light. The number of sheets is differentiated step by step, and the phototransistor output voltage is stored at certain time intervals when a breakage abnormality of the toilet paper sheet 1 is detected according to the magnitude of the voltage by measuring the voltage change that reacts with the amount of light. If the difference between the memorized value and the detected output voltage is greater than or equal to the specified value, it is determined as a candidate for damage, and the duration of the voltage lower than the threshold value of the candidate for damage is measured and specified. Toilet paper inspection apparatus according to the above, characterized in that it has a circuit configuration for determining that there is damage to be dealt with when the duration of the state having a difference greater than or equal to a value exceeds a specified value A.
Elimination of erroneous inspections in inspections and unnecessary stoppages are eliminated.

Furthermore, the toilet paper inspection apparatus of the present invention proposes a structure that prevents paper dust from adhering to the apparatus itself.
In other words, by attaching this device, paper dust accumulates on the base made of metal bar of the device or a cover made of transparent material attached to it, or adheres to the LED emitter and phototransistor. Air showers for blowing off dust were provided at three locations so as not to affect the detection accuracy and to prevent dust from falling on the paper and adhering to the product.

The LED light emitter and the phototransistor are each covered with a cover made of a transparent material or the like attached to the base so that dust does not easily adhere.
However, paper dust may adhere even if it is covered with a cover, so an air shower is provided on the surface of the LED light emitter and the phototransistor to blow off dust that may adhere.
In addition, dust may accumulate on the transparent cover, so an air shower that blows out air is provided above the cover located above to prevent paper dust from adhering to the device itself. The product is not dropped.

Next, the operation of the toilet paper inspection apparatus will be described.

When the power switch of the toilet paper inspection apparatus is turned on, light is emitted from the LED light emitter.
Next, the traveling means of the roll paper manufacturing apparatus is driven to rotate the roll, and the toilet paper sheet to be inspected is caused to travel.
The rotation speed of the roll is set to a predetermined speed, and the traveling speed of the sheet can be grasped.

The irradiated range of the sheet extends over the entire length in the lateral direction, and the irradiated range is determined in relation to the beam diameter (diameter) and the distance of the light from the LED emitter.
Since the distance between the LED emitter and the roll paper is determined at the position where the inspection device is mounted, the irradiation range of the sheet is determined by selecting the beam diameter and number of light of the LED emitter (the entire inspection width). It can be done properly over time.

The irradiation range irradiated with the light from the LED light emitter is set so that adjacent irradiation ranges are in contact with each other or partially overlap over the entire inspection width of the toilet paper sheet.
The LED light emitters can be connected without gaps to form strip-shaped inspection light, and the entire inspection width is irradiated without omission until it is emitted from the LED light emitter and received by the phototransistor.

The amount of light received by the phototransistor is monitored by a detection circuit and compared with a reference amount of received light.
If the traveling toilet paper sheet is in a normal state and there is no damage or foreign matter within the light irradiation range, it reaches the phototransistor without being blocked or scattered, and a predetermined amount of received light is detected. Therefore, the paper, 2 sheets, 1 sheet, and 0 sheets can be differentiated step by step, and the detection circuit determines that the inspection state is normal, and the toilet paper sheet continues to run.

If there is an abnormal part such as an insect or dust on the toilet paper sheet, the light is blocked or scattered, and the amount of light received by the phototransistor is reduced.
A decrease in the amount of received light is detected by a detection circuit inside the apparatus. The detection circuit compares the received light amount with a reference, and transmits an abnormal signal notifying the abnormality if it is determined that the inspection state is abnormal.
At the same time, the traveling of the toilet paper sheet is stopped.
In the detection of breakage, which is the main problem of the present invention, if there is an abnormal part such as breakage in the toilet paper sheet, a large amount of light is transmitted, and the amount of light received by the phototransistor increases.
The increase in the amount of received light is measured as a voltage change, and if it is determined that the voltage is abnormal (other than the standard value), a roll paper travel stop signal is transmitted.

The toilet paper inspection apparatus according to the present invention is a technology for detecting tears peculiar to toilet paper (longitudinal direction = longitudinal direction of 30 cm or more, detection of breakage corresponding to single / double and lateral tearing). It is possible to detect abnormalities (scratches and torn holes) in the toilet paper sheet 1 that occur in response to specific embossing, two-ply sheets, impurities, and properties specific to recycled roll paper.
Even in the inspection of a toilet paper sheet having a wide inspection width, it is possible to perform a leak-free inspection over the entire inspection width with a simple configuration at low cost and with high-speed response.
In addition, when a defect or the like that is a predetermined range of breakage occurs in the inspection, the occurrence is immediately detected and a stop signal is sent, so that the occurrence of a defective product exceeding a certain standard can be avoided.
The abnormal form detection can be set within a predetermined range (for example, when there is a small hole or crease in only one sheet with a double roll, or an object with a small tear is not detected).
Furthermore, quality control can be performed using data such as the frequency of stoppages and breakage leading to the stoppage.

It is explanatory drawing which shows the test | inspection principle of the toilet paper test | inspection apparatus which concerns on this invention. It is a circuit diagram of the sensor of a toilet paper inspection apparatus. It is explanatory drawing which shows arrangement | positioning of the toilet paper test | inspection apparatus in manufacturing apparatuses, such as the toilet paper which is the recycled roll paper which concerns on embodiment of this invention. It is graph explanatory drawing which shows that a voltage falls according to the light quantity which the phototransistor in the toilet paper test | inspection apparatus which concerns on embodiment of this invention receives, ie, according to the breakage degree of paper. It is a graph explanatory drawing which shows that there exists a differential voltage according to the light quantity which the phototransistor in the toilet paper inspection apparatus which concerns on embodiment of this invention similarly receives. It is explanatory drawing of. It is a perspective view which shows the toilet paper inspection apparatus which concerns on embodiment of this invention. It is side surface schematic which shows a toilet paper test | inspection apparatus, and is explanatory drawing which shows having provided the air shower 5 on the surface of the LED light-emitting body 3 and the phototransistor 4. FIG. It is explanatory drawing which shows the voltage change numerical value which appears on the monitor of a toilet paper inspection apparatus. It is explanatory drawing of the alarm display which similarly appears on the monitor of a toilet paper inspection apparatus. It is a block diagram which shows the toilet paper inspection apparatus which concerns on the Example of this invention. It is a circuit diagram of a toilet paper inspection apparatus.

FIG. 1 to FIG. 7 illustrate the principle of inspection and show a toilet paper inspection apparatus according to an embodiment of the present invention.
FIG. 1 is an explanatory diagram of the detection principle. Light passing through the toilet paper sheet 1 from the LED light emitter 3 is received by the phototransistor 4, and an abnormality of the toilet paper sheet 1 is detected by a voltage fluctuation that reacts depending on the amount of light. Explains the principle of detection.
The arrow shown in the figure indicates the irradiation direction of the LED light emitter 3, and the longest arrow at the center is abnormal (scratches and tear holes) in the toilet paper sheet 1, so that much light is sensed and the phototransistor 4 This is the principle that an abnormality can be detected by receiving light.
When an abnormality is detected, an alarm alarm or a roller stop measure is used.
The LED light emitter 3 serving as the light source provided on the lower side and the phototransistor 4 are provided opposite to each other with the toilet paper sheet 1 moving and moving therebetween. The thinner the paper, the lower the voltage output from the phototransistor 4. Therefore, for example, when inspecting two rolls of roll paper, it is possible to capture the change from the voltage when the roll paper is in a transparent state when the two sheets are normal to the time when the paper is 1 and when the paper is 0 (hole state). Thus, an abnormality such as a paper break is detected.
It can be applied to various sheet-like objects having a change in light transmission.

FIG. 2 is a circuit diagram of the phototransistor 4 of the toilet paper inspection apparatus. All the phototransistors 4 arranged at regular intervals are short-circuited to the AD converter 10 and the threshold value setting circuit 13. It is a circuit diagram which shows the structure connected to the connected determination circuit.
The output of each phototransistor 4 is short-circuited on the circuit to reduce the sensor output voltage determination circuit 11.
The detection circuit monitors a voltage change from the amount of light received by the phototransistor 4 constantly or at regular intervals, and detects an abnormally damaged portion of the toilet paper sheet 1 while comparing it with a reference voltage.
The output voltage from the amount of light received by the phototransistor 4 is stored at certain time intervals, and if the difference between the stored value and the detected output voltage is greater than or equal to a specified value, it is determined as a candidate for damage, and further the difference greater than or equal to the specified value This is a circuit configuration in which it is determined that there is damage to be dealt with when the duration of a certain state is equal to or greater than a predetermined value.
When an abnormality is detected, a stop signal is transmitted to the drive unit of the manufacturing apparatus.

FIG. 3 is an explanatory diagram of a winding process for winding up a roll paper base paper of a toilet paper into a normal size on the market.
This indicates that the inspection is performed after overlapping the two sheets so-called double.
In the production of toilet paper, the toilet paper sheet 1 that is thin enough to have light permeability is initially wound into a large and thick roll, and is manufactured in a process as shown in FIG.
The sheet pulled out from the thick roll is embossed through several rolls, creating a soft feeling and good feeling, running through the toilet paper inspection device, and then rolls with or without core Rolled up as
In the case of toilet paper, flexible processing and embossing are reinforced with elasticity and flexibility, improving added value as a product, improving water absorption, reducing paper breakage, and abnormal rate of shape wound by rolls (Defect product incidence) is also decreasing.
In such a process, after being wound up in a roll shape, it is cut into a predetermined standard width to create a toilet paper roll.
It is cut into a predetermined size and commercialized as a commercial toilet paper, and individually or several pieces are covered with wrapping paper.
However, the thick roll-shaped base paper of toilet paper is in the process of embossing, etc., and since the roll paper is softened and runs, fine dust that peels off naturally occurs, and paper dust is scattered. There is a unique environment.
Although dust scattered in the air is sucked by an air cleaning device in the factory, there is a possibility that considerable paper dust may adhere to the LED light emitter 3 side and sensor 4 side of the detection device. Cleaning is an important issue.

The toilet paper inspection apparatus 2 according to the present invention is a retrofit type apparatus that is attached to an existing toilet paper manufacturing apparatus.
The attachment position is provided at a position corresponding to a process near the final completion stage.
It can be installed without any influence without contact with the rollers of the manufacturing apparatus and other existing devices.
The toilet paper inspection device 2 is provided on a metal base having a predetermined width at a position where roll paper is sandwiched from above and below at a small interval, and the LED light emitters 3 provided in a row on the lower base, and a toilet that moves and moves. The phototransistors 4 are provided in a row on the upper base so as to face each other with the paper sheet 1 interposed therebetween, and the light that has passed through the toilet paper sheet 1 from the LED light emitter 3 is received by the phototransistor 4, depending on the amount of light Abnormality of the toilet paper sheet 1 corresponding to the magnitude of the voltage is detected by measuring the voltage change that reacts.
The detection range of the abnormality is preferably stopped when the breakage is “longitudinal direction = 30 cm or more in the paper flow direction”, and is stopped only when “longitudinal direction = 30 cm or more in the paper flow direction”.
If the duration of the state in which the difference between the stored value and the detected output voltage is equal to or greater than the specified value is longer than the specified value corresponding to “30 cm”, it is determined that there is damage to be dealt with.

In the case of less than 30cm breakage of toilet paper, if the part is cut at the time of use, the next roll will continue immediately, so there will be no major trouble. Do not instruct the device to stop.
Moreover, in the case of double (two sheets) toilet paper, it is possible to detect when there is no abnormality on one side and the hole is large on the other side.
In other words, one 30 cm breakage is detected as both a 30 cm breakage.
There is a feature that can be set to detect damage corresponding to single and double.
The inspection apparatus is provided with means such as an encoder for detecting the traveling speed of the toilet paper sheet, an LED light emitter 3 as light emitting means, and a phototransistor 4 as light receiving means.
A device capable of detecting the breakage distance in response to a change in the traveling speed of the sheet by means such as an encoder is provided with a detection circuit and a roller stop signal circuit, and is electrically connected.

The LED light emitter 3 and the phototransistor 4 as a light receiving means are provided in a direction perpendicular to the width direction of the toilet paper sheet 1.
The LED light emitters 3 and the phototransistors 4 are arranged in a line at a predetermined interval, and light emitted from the LED light emitters 3 irradiates the sheet 1 with a predetermined spot area.
Although not described in the embodiment, the LED light emitter 3 provided near one end and the phototransistor 4 as a light receiving means can be designed to be used only for the presence / absence determination of the sheet 1.

The LED illuminant 3 and the phototransistor 4 are opposed to each other with a toilet paper sheet 1 sandwiched therebetween with a small gap, are arranged in parallel to the toilet paper sheet 1, and are separated from the toilet paper sheet 1. The distances to the phototransistors 4 are equally spaced.

The perspective view shown in FIG. 6 shows one embodiment of the toilet paper inspection apparatus according to the present invention, which is a toilet paper inspection apparatus for inspecting a wide toilet paper sheet having light permeability, and is embossed. It is provided at a position where the sheet travels from the roller.
The toilet paper inspection apparatus sandwiches an LED light emitter 3 arranged in a line at equal intervals inside a long and narrow cover 6 and a sheet 1 for toilet paper that moves and moves in a side view arranged in a direction perpendicular to the traveling direction. The phototransistor 4 is provided at an inner position facing the LED light emitter 3 on an elongated L-shaped cover 6 as viewed from the side.
The cover 6 may be provided by being attached to an elongated metal base, or the cover 6 itself may be used as a base.
The cover 6 positioned above supports and covers the phototransistor 4 and covers the upper side of the phototransistor 4 and the roll paper traveling side.
This is to prevent the intrusion of paper dust and protect it from the accumulated dust.
The cover 6 located below is for preventing paper dust from entering and adhering to the LED light emitter 3.
A plurality of LED light emitters 3 in a row covered with a cover 6 and a number of phototransistors 4 in a row covered with a cover 6 are opposed to each other with a predetermined gap.

The upper cover 6 is provided with an air shower 5 that blows air to the surface of the phototransistor 4 and an air shower 5 that blows air to the surface of the cover 6 that is located on the upper side (庇) of the phototransistor 4. .
The cover 6 located below is provided with an air shower 5 through which air is jetted onto the surface of the LED light emitter 3.
Air showers 5 are provided at three locations.
The air shower 5 is connected by a tube from an air compression pump and is connected to a square pipe. The square pipe has a length equivalent to that of a metal base, and air discharge ports with a diameter of about 0.3 mm are provided on the side surface at substantially equal intervals with the LED light emitter 3 and the phototransistor 4. By ejecting, all of the LED light emitter 3 and the phototransistor 4 are cleaned.
In addition, air is intermittently ejected also to the upper surface of the cover 6 located on the upper side (４) of the phototransistor 4 to blow away paper dust adhering to the surface of the cover 6.
The adhesion of paper dust prevents the light quantity inspection accuracy from being affected.

In this way, light that has passed through the toilet paper sheet 1 from the LED light emitter 3 is received by the phototransistor 4 with a configuration of stable detection accuracy protected from paper dust, and the toilet paper is caused by voltage fluctuations that react with the amount of light. A toilet paper inspection device has been proposed that detects an abnormality in the sheet 1 and can detect the abnormality within a predetermined range, detects a tearing mode according to the magnitude of the voltage, and instructs the roll winding to stop. The

FIG. 3 is an explanatory diagram showing the overall configuration of the present invention. Toilet paper sheet 1 is sent out by each roller in the direction of the arrow, embossed in the middle of feeding, and then passes through the toilet paper inspection apparatus according to the present invention. Then, it is inspected for abnormalities and wound on a roll.

In the embodiment, the phototransistor 4 and the LED light emitter 3 are planted at a pitch of about 10 mm on the base.
Since the amount of light transmitted from the LED light emitter 3 increases as the thickness of the sheet such as recycled toilet paper 1 (2 sheets: double, 1 sheet: single, 0 sheet: perforated) decreases, the output of the phototransistor 4 By measuring the voltage, it is possible to distinguish between two sheets, one sheet, and zero sheets.
“Paper break” is the condition when manufacturing two sheets of paper (double toilet paper)
In the case of manufacturing one sheet of paper (single toilet paper), the one-sheet state and the zero-sheet state indicate that the zero-sheet state is a paper break.

The output of the phototransistor 4 is short-circuited through a diode.
If all outputs are short-circuited, the location of the paper break will not be known, but the output of whether the paper breaks will be one, at least normal or abnormal status can be distinguished, and the number of measurement is also one Therefore, the determination circuit 11 is also simplified.
If the output of the phototransistor 4 is short-circuited for every several lines, it is possible to divide the paper break location into blocks, but the determination circuit 11 becomes complicated because the number of measurement increases.

The determination method of the output voltage of the phototransistor 4 is performed by two types, a difference method and an absolute value method.
In the differential method, the output voltage of the phototransistor 4 is stored at certain time intervals, and if the difference between the stored value and the detected output voltage is equal to or greater than a specified value, it is determined as a candidate for damage, and there is a difference equal to or greater than the specified value. This is a method for determining that there is a damage to be dealt with when the state duration is equal to or greater than a predetermined value.
The absolute value method is used to compensate for the disadvantages of the difference method.
If the toilet paper produced is, for example, two sheets (double), and if it is in the state of one sheet of paper that is defective from the beginning of the inspection, the state of one sheet of paper is stored in the differential method. Since it is detected at the time of returning to two sheets, it is detected with a delay.
In the absolute value method, since an appropriate output voltage value range for two sheets of paper and one sheet of paper is defined, the state of one sheet can be detected immediately.
In both the differential method and the absolute value method, the voltage duration lower than the threshold value of the damage candidate is measured, and the detection is not made unless the paper breakage state is longer than a certain length (30 Cm).

The phototransistor 4 output voltage is measured using a sequencer with an analog voltage input.
The LED illuminant 3 is driven by a constant current method to minimize changes in light quantity due to temperature and aging.

As described above, the present invention distinguishes between two sheets of paper, one sheet, and zero sheets by utilizing the fact that the output voltage changes depending on the amount of transmitted light depending on the thickness of the paper. Therefore, the sensor output voltage determination circuit 11 is reduced by arranging the entire paper width and shorting all the sensor outputs in a circuit.

Specifically, the sensor output voltage is stored at certain time intervals, and the difference between the stored value and the detected output voltage is greater than or equal to the specified value, and the photo on two sheets of paper and one sheet of paper that are specified In this method, the absolute value of the output voltage of the transistor is a candidate for drilling or breaking, and if the duration of the state in which there is a difference greater than or equal to a specified value is greater than or equal to a specified value, a determination method is assumed that a hole or break is detected.

The graphs of FIGS. 4 and 5 show the voltage that changes when the light source is the LED emitter 3 and the incident light at the broken portion is received by the phototransistor 4.
The output voltage of the phototransistor 4 decreases as the paper becomes thinner as shown in the figure.
Therefore, the paper breakage is detected by detecting the change from the normal 2-sheet voltage to the 1-sheet time and the 0-sheet time.
Since a control unit uses a sequencer, inspection data can be easily managed by connecting a personal computer or the like, and analysis can be performed using the number of stops and voltage change data.

As described above, the detection of the break in the present invention is a two-stage system of an absolute value method and a difference method.
The voltage value at the time of two sheets of paper is updated every specified time (for example, 0.4 seconds), and the voltage of the paper is constantly monitored.
It is detected when a state more than a specified change amount (eg, 0.41 V drop) from that state continues for a specified time (eg, 0.5 seconds).
Therefore, it follows the voltage fluctuation when two sheets of paper are caused by variations in the paper thickness. Further, independent of the difference method, whether or not the two-sheet voltage is within an appropriate voltage (2.5 V to 4.5 V) is always monitored.

The present invention employs a long-life LED and is driven at a constant current (minimum change in the amount of light due to the heat of the LED).
Further, the phototransistor 4 for detecting an abnormal state has a monitor phototransistor dedicated to monitoring the change in the amount of light, and by setting the LED current value according to the output voltage of the monitor phototransistor so as to become a specified voltage value, The amount of LED light is made constant to cope with a decrease in the amount of light due to LED aging.

FIG. 7 is a diagram showing that the air shower 5 is provided on the surfaces of the LED light emitter 3 and the phototransistor 4, and one air shower 5 is provided on the LED light emitter 3 side and sprayed on the cover 6 surface. It is shown that two are provided on the side 4, one that sprays on the surface of the cover 6 and the air shower 5 that sprays on the metal base or the upper surface of the cover 6.
The air shower is connected by a tube from an air compression pump and connected to a hollow square pipe.
The square pipe has a length equivalent to that of a metal base, and air discharge ports having a diameter of about 0.3 mm are provided on the side surface at substantially equal intervals similar to the LED light emitter 3 and the phototransistor 4.

The air shower 5 is divided into two systems (upper part and cover part), intermittently ejects air, blows away paper dust and dust that accumulates on the upper surface of the cover 6 serving as a sensor block, and reduces dust to the toilet paper 1 as much as possible. Prevent the lump from falling.

The air shower 5 incorporated in the present invention includes an electromagnetic valve that operates intermittently, and blows the cover system side air shower 1.5 seconds → break 8 seconds → upper air shower spray 1.5 seconds → break 8 seconds in this order. Remove dust etc. repeatedly.
Control is performed by a sequencer.
In the embodiment, the actual blowing time is 3 seconds / 18 to 19 seconds (whole), but the interval and spraying time can be appropriately changed.
In this embodiment, an air tank with a capacity of 22 liters was used.

As a means for protecting precision equipment from dust and the like, an electrostatic plate can be used for the cover 6 in order to further separate dust from the LED and the phototransistor.

FIG. 8 shows the state and contents of display in the sequencer as a table.
In the table, OUT indicates the current result voltage, STD indicates the current reference value for two sheets of paper, the monitor phototransistor indicates the monitor voltage value (LED light amount value), and MODE indicates the current mode state. Yes.

The value of OUT is about 3.4 for two sheets, about 1.8 for one sheet, and about 0.6 for zero sheets.
The STD is updated every internal set time, and when there is a specified voltage drop from this value, “paper break” is detected.
At this time, an alarm message is displayed.
The value when paper breakage is detected is configured to return to the current value when the reset switch is pressed.

FIG. 9 shows an alarm list as a table of alarm No., display (name of alarm), contents, and coping method.
Detect at the moment when the switch is switched to “ON”.
Alarm No. in monitor phototransistor diagram 03, 02, and 04 are detected only at the moment when the switch is switched to “ON”, and are not performed during the inspection.

FIG. 10 is a block diagram showing a schematic configuration of the toilet paper inspection apparatus according to the embodiment of the present invention.
It shows that the LED light-emitting body 3 group, the sensor 4 group, the AD converter 10, the determination circuit 11, the output circuit 12, and the threshold value setting circuit 13 are configured.
The arrows shown in the figure indicate the irradiation direction.

When comparing image processing with a camera and the present invention, one of the advantages of the phototransistor method is that it is inexpensive and quick in response.
The width of the hole detection can be changed by the arrangement pitch and the mounting height of the phototransistors 4.

FIG. 11 shows a circuit diagram of the toilet paper inspection apparatus of the present invention, and shows that the measurement point and volume (for sensitivity adjustment) are provided.
When the LED illuminant 3 was used on the light emitting side of the present invention, the sensitivity was high and stable in detecting the hole, and the lifetime was several years.
If a fluorescent lamp is used, the sensitivity for detecting holes is medium and the life is in units of several months. The fluorescent lamps are mixed with light of various wavelengths, but the LED light emitter 3 has one type of wavelength, so that the light receiving side can maintain stable sensitivity.

A number of experiments, including adjustment of detection accuracy, were conducted up to the present invention.
As a result of the detection of the paper thickness, an experiment was conducted to determine whether it was possible to detect a state where one sheet was torn (one sheet: abnormal) with two sheets (normal) due to a reduction in the number of units installed in the apparatus and space problems.
By adjusting the sensitivity adjustment volume, it is possible to distinguish the state of two sheets of paper, one sheet of paper, and zero sheets of paper by the phototransistor voltage.
If the take-up device is a dual paper (single) and single paper (single) device, the detector can change the product type based on only whether or not production is performed on two papers and one paper. The advantage is that this is easy.
The output circuit needs to be able to read this voltage, which is one of the technical features of the present invention.

A temperature change prediction experiment of the output voltage is also performed, and the distance between the LED light emitter 3 and the sensor is set to 80 mm, and the current value flowing to the LED light emitter 3 is changed.
The current flowing through the LED light emitter 3 and the amount of light have a proportional relationship.
LED luminous body 3 recognized that 1% light quantity changed for every 1 degreeC change with respect to temperature.

The above embodiments are merely examples and are not strictly limited thereto.
Changes in the number of papers to be inspected and measured, and changes in parts that have the same effect used in measuring equipment are design change matters expected by the inventor.

  The present invention is a toilet paper inspection apparatus 2 mainly intended for use in inspection of toilet paper, which is recycled roll paper, but for inspection of printing paper, thin film, thin panel, etc. that have some kind of light transmission. Is also applicable.

1 Toilet paper sheet 2 Toilet paper inspection device 3 LED emitter 4 Phototransistor (sensor)
5 Air Shower 6 Cover 10 AD Converter 11 Judgment Circuit 12 Output Circuit 13 Threshold Value Setting Circuit

Claims (2)

The LED light emitters 3 provided at equal intervals in a row and the phototransistor 4 provided in a row opposite to each other with the toilet paper sheet 1 moving and moving in between, and the toilet paper sheet 1 passed from the LED light emitter 3 An inspection device for detecting a breakage abnormality of the toilet paper sheet 1 according to the magnitude of the voltage by measuring a voltage change in which light is received by the phototransistor 4 and reacts depending on the amount of light. An air shower 5 for blowing air is provided on the surface of the transistor 4, and an air shower 5 is provided above the cover 6 of the phototransistor 4 located above. The voltage change measurement that reacts depending on the amount of light depends on the amount of light transmitted by the thickness of the paper. Using the change of the output voltage, the appropriate output voltage value range for two sheets of paper and one sheet of paper The output voltage of the phototransistor 4 is determined by performing stepwise distinction between two sheets, one sheet, and zero sheets, and an AD converter 10, a determination circuit 11, an output circuit 12, and a threshold value setting circuit 13 are provided. Is stored at certain time intervals, and if the difference between the stored value and the detected output voltage is greater than or equal to the specified value, it is determined as a candidate for damage, and a voltage lower than the threshold value of the candidate for damage Measure the duration, and if the duration of the state where there is a difference greater than the specified value is greater than a specified value, the circuit configuration that determines that there is damage to be dealt with is set to the set voltage range and the magnitude of the set voltage A toilet paper inspection apparatus, wherein a tearing mode according to the condition is detected and a roll winding is instructed to stop. The toilet paper inspection apparatus according to claim 1, wherein the determination circuit (11) is a determination circuit (11) in which the phototransistors (4) are all short-circuited with diodes and connected to the AD converter (10) and the threshold value setting circuit (13).