Carton Printing System

Abstract

To provide a foreign matter removal system which can stably collect foreign matter such as paper powder.SOLUTION: A foreign matter removal system includes: a destaticizing head 21 which is arranged to face a processing region in a carton C which is conveyed along a conveying path 2a and has the processing region where prescribed processing is performed and supplies ionized air AR; a destaticizing controller 22 which adjusts air quantity of the ionized air AR supplied from the destaticizing head 21; a dust collector 12 which is arranged at a position on a lower side of the processing region outside the conveying path 2a; and a control section which controls the destaticizing controller 22 according to wind pressure of the ionized air AR supplied from the destaticizing head 21 and controls the air quantity of the ionized air AR supplied from the destaticizing head 21.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to Carton Printing System This is regarding. [Background technology]

[0002] A carton printing system is used in which cartons with a printed area on their surface are printed with a laser marker to peel off the printed area along the printed content to display the characters. In the above-mentioned laser printing, the peeled paper powder becomes charged due to the peeling, and may re-adhere to the carton, resulting in poor printing during inspection after the printing process.

[0003] Patent Document 1 discloses a removal device that uses a static eliminator and a blower arranged above to blow ionized air from above, neutralizing static electricity on cardboard while sucking and removing paper dust. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-082553 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the removal device of Patent Document 1, even if the flow rate of ionized air is set, it is difficult to obtain a stable wind pressure due to the nozzle shape and environmental fluctuations. If the wind pressure is not stable, there is a possibility that the paper dust may not be collected sufficiently or that the paper dust may scatter.

[0006] The present invention has been made in consideration of the above points, and provides a dust collector capable of stably collecting foreign matter such as paper dust. Carton Printing System The purpose is to provide. [Means for solving the problem]

[0007] According to a first aspect of the present invention, there is provided a foreign matter removal system comprising: a static elimination head that is transported along a transport path and positioned facing a processing area of ​​a carton in which a predetermined processing is performed, and that supplies ionized air; a static elimination controller that adjusts the volume of the ionized air supplied from the static elimination head; a dust collector that is positioned outside the transport path and below the processing area; and a control unit that controls the static elimination controller in accordance with the wind pressure of the ionized air supplied from the static elimination head, thereby controlling the volume of the ionized air supplied from the static elimination head.

[0008] According to a second aspect of the present invention, there is provided a carton printing system comprising a conveying device that conveys a carton having a printing area along a conveying path, a printing device that prints characters by irradiating the printing area with laser light, and a foreign matter removal system that removes foreign matter generated in conjunction with the printing of the characters, wherein the foreign matter removal system is the foreign matter removal system of the first aspect. Effect of the Invention

[0009] The present invention makes it possible to stably collect foreign matter such as paper dust in a foreign matter removal system and a carton printing system. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an embodiment of the present invention, and is a schematic configuration diagram of a carton printing system 1. [Diagram 2] FIG. 1 is a schematic diagram of a carton printing system 1 as viewed from the upstream side in the conveying direction. [Diagram 3] FIG. 2 is a control block diagram of the foreign matter removal system 10. [Figure 4] 11 is a diagram showing the relationship between the flow rate of ionized air AR supplied from the static elimination head 21 and sound pressure. FIG. [Diagram 5] 11 is a diagram showing the relationship between the flow rate of ionized air AR supplied from the static elimination head 21 and the amount of charge reduction. FIG. [Figure 6] FIG. 11 is a diagram showing the relationship between the amount of charge and the elapsed time after the start of a printing process. [Figure 7] FIG. 2 is a diagram showing the amount of charge on cartons after printing processing in the samples of Examples 1 to 3 and Comparative Example 1. [Figure 8] FIG. 1 is a diagram showing the percentage of cartons that were rejected due to defective inspection results in the samples of Examples 1 to 3 and Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a foreign matter removal system and a carton printing system according to an embodiment of the present invention will be described with reference to FIGS. The following embodiment shows one aspect of the present invention, does not limit the present invention, and can be modified as desired within the scope of the technical idea of ​​the present invention. In addition, in the following drawings, the scale and number of each structure are different from the actual structure in order to make each configuration easier to understand.

[0012] Fig. 1 is a schematic diagram of a carton printing system 1 that performs a printing process on a carton C. Fig. 2 is a schematic diagram of the carton printing system 1 as viewed from the upstream side in the conveying direction.

[0013] The carton printing system 1 performs printing processing on the printing area (processing area) CA of the transported carton C. In this embodiment, the carton C is formed into a rectangular box shape from paperboard, and as an example, tablet sheets are stored therein. The material of the carton C is not limited to paperboard, and may be made of resin. The contents of the carton C are not limited to tablet sheets, and may be other objects. Furthermore, the shape of the carton C is not limited to a rectangular box shape, and may be other shapes such as a cylindrical shape, a spherical shape, or an elliptical shape, but from the perspective of performing the printing processing, it is preferable that at least the printing area is flat.

[0014] The printing process of carton C is part of the manufacturing process of carton C. The manufacturing process of carton C includes a carton forming process, a tablet sheet inserting process, a carton flap inserting process, a hot melt bonding process, a printing process by irradiating laser light, and an inspection process. Figures 1 and 2 show the periphery of the printing area A where the printing process is carried out.

[0015] As shown in FIG. 1, the carton printing system 1 includes a conveying device 2, a printing device 3 shown in FIG. 2, and a foreign matter removal system 10. The conveying device 2 sequentially conveys a plurality of cartons C along a conveying path. The conveying device 2 is, for example, a conveyor having an endless belt-like conveying belt 2a. The conveying belt 2a forms the conveying path. The conveying device 2 conveys the cartons C placed on the conveying belt 2a along the conveying path that extends horizontally from the left side to the right side in FIG. 1 (from the front side to the back side of the paper in FIG. 2).

[0016] In the following description, the up-down direction is called the Z direction, the upper side is called the +Z side, and the lower side is called the -Z side. The direction along the conveying path is called the X direction, the downstream side in the conveying direction is called the +X side, and the upstream side in the conveying direction is called the -X side. In addition, the width direction of the conveying belt 2a, which is horizontal and perpendicular to the conveying direction, is called the Y direction, the side of the conveying belt 2a where the printing device 3 is located is called the -Y side, and the side opposite the -Y side is called the +Y side.

[0017] As shown in Figures 1 and 2, carton C has a print area CA on side 5 on the -Y side facing outward from the conveying path. The print area CA is printed in a color (black in Figure 1) different from the color of side 5 (white in Figure 1). Characters ("123" in Figure 1) are printed in the print area CA after printing processing. The characters are printed by peeling off part of the printed print area CA in the shape of the characters, creating a contrast between the color of the print area CA and the color of side 5, which is the base color.

[0018] The printing device 3 irradiates the printing area CA with laser light L. The printing device 3 irradiates the printing area CA with the laser light L in a dot shape and scans the laser light according to the character shape, so that the scanned printing area CA is peeled off in the character shape to expose the side surface 5 and perform printing.

[0019] The foreign matter removal system 10 removes, as foreign matter, paper dust and the like that has been peeled off from the print area CA by irradiation with laser light L. The foreign matter removal system 10 has a charge-removing air nozzle 20, a dust collector 12, a sound pressure measuring unit (acoustic sensor) 13, ionizers 14 and 15, charge amount measuring units (charge sensors) 16 and 17, and a control unit CONT.

[0020] The static elimination air nozzle 20 has a static elimination head 21 and a static elimination controller 22. The static elimination head 21 supplies ionized air AR from a nozzle 21a. The static elimination head 21 is disposed on the outer side of the conveyor belt 2a on the -Y side. The static elimination head 21 is disposed facing the print area CA of the carton C. The static elimination target area is mainly the -Y side of the print area CA (print position) where the print process is being performed. The static elimination head 21 is disposed on the +Z side of the optical path of the laser light L in the print area A. That is, the static elimination head 21 is disposed on the +Z side of the print area CA where the laser light L is printed.

[0021] The nozzle 21a can rotate in the circumferential direction, which is the direction of the arrow shown in FIG. 2, around an axis extending in the X direction. The rotation range of the nozzle 21a is, for example, a range of ±75° with respect to a reference position. By rotating the nozzle 21a, it is possible to change the height position of the nozzle 21a with respect to the conveyor belt 2a and the direction in the circumferential direction of the ionized air AR blown out from the nozzle 21a. The nozzle 21a is initially positioned at an angle θ with respect to a vertical line extending in the Z direction. It is preferable that the angle θ is 40° or less and the distance is within 150 mm. The rotation of the nozzle 21a is controlled by the control unit CONT.

[0022] The static elimination controller 22 adjusts the volume of the ionized air AR supplied from the static elimination head 21. The adjustment of the volume of the ionized air AR by the static elimination controller 22 is controlled by the control unit CONT. That is, the control unit CONT controls the static elimination controller 22 to control the volume of the ionized air AR supplied from the static elimination head 21.

[0023] The dust collecting device 12 has a dust collecting duct 12A and a suction device 12B. The dust collecting duct 12A is disposed on the outer side, that is, on the -Y side, of the conveyor belt 2a at the printing position. The dust collecting duct 12A has a suction port 12C facing the +Z side at a position on the -Z side of the printing area CA at the printing position. The suction device 12B is a negative pressure source. The suction device 12B supplies negative pressure to the dust collecting duct 12A. The dust collecting device 12 can collect paper dust through the dust collecting duct 12A by operating the suction device 12B. The dust collecting capacity of the dust collecting device 12 can be set between 10 m / sec and 20 m / sec, for example. The driving of the suction device 12B is controlled by the control unit CONT.

[0024] The sound pressure measuring unit 13 measures the sound pressure generated by the supply of ionized air AR in the static elimination head 21. The sound pressure measuring unit 13 is disposed between the print area CA and the static elimination head 21 in the Y direction. The sound pressure measuring unit 13 is disposed on the +Z side above the carton C in the Z direction. By disposing the sound pressure measuring unit 13 above the carton C, noise due to reflection and reverberation can be reduced.

[0025] The position of the sound pressure measuring unit 13 in the Z direction is approximately the same as the position of the nozzle 21a in the static elimination head 21. A signal of the sound pressure accompanying the supply of the ionized air AR measured by the sound pressure measuring unit 13 is output to the control unit CONT via a low-pass filter 18. Since aliasing noise of high-frequency components in the sound pressure signal of the ionized air AR measured by the sound pressure measuring unit 13 affects signals in the low-frequency range, the low-pass filter 18 can improve the accuracy of the measured sound pressure by removing the noise.

[0026] The range necessary for controlling the sound pressure measuring unit 13 is, for example, 1000 Hz or more and 8000 Hz or less. The range in which the low-pass filter 18 cuts acoustic noise is 0 Hz or more and 50 Hz or less.

[0027] The ionizers 14 and 15 can measure the charge (+ or -) and charge amount (potential) of the static electricity stored on the carton C to be de-electrified as an ion current value, and based on the measurement value, irradiate (for example, using a pulse AC method) an ion pulse of charge and charge amount in a direction that removes or reduces the charge amount of the static electricity.

[0028] With respect to the X direction, the ionizer 14 is disposed on the +Z side upstream of the static elimination head 21. Two or more ionizers 14 may be disposed upstream of the static elimination head 21. The ionizers 14 eliminate or reduce the charge on the cartons C before the printing process that are transported to the printing area A. With respect to the X direction, the ionizer 15 is disposed on the +Z side downstream of the static elimination head 21. Two or more ionizers 15 may be disposed downstream of the static elimination head 21. The ionizers 15 eliminate or reduce the charge on the cartons C after the printing process that are transported from the printing area A.

[0029] The charge amount measuring units 16 and 17 measure the amount of charge in the printing area A. The charge amount measuring units 16 and 17 are arranged on the outer side, that is, the -Y side, of the conveyor belt 2a, on the +Z side near the suction port 12C of the dust collection duct 12A. The charge amount measuring unit 16 measures the amount of charge on the upstream side of the printing area A. The charge amount measuring unit 17 measures the amount of charge on the downstream side of the printing area A. By arranging the charge amount measuring units 16 and 17 near the suction port 12C of the dust collection duct 12A, the charge amount in the printing area A can be measured with higher accuracy. The charge amount signals measured by the charge amount measuring units 16 and 17 are output to the control unit CONT.

[0030] FIG. 3 is a control block diagram of the foreign matter removal system 10. As shown in FIG. The control unit CONT has a calculation unit 31 and a memory unit 32. The calculation unit 31 performs various calculation processes such as FFT (fast Fourier transform; resolution of about 4096 to 8192, compatible with sequencer processing), time series analysis, coordinate conversion, machine learning (model checking, etc.), etc., using input signals input from the sound pressure measurement unit 13, the low-pass filter 18, and the charge amount measurement units 16 and 17 constituting the input unit IN.

[0031] Based on the results of calculations performed by the calculation unit 31, the control unit CONT outputs control signals to the static elimination head 21, static elimination controller 22, and suction device 12B that constitute the output unit OUT, and controls the operations of these devices.

[0032] For example, memory unit 32 stores past data related to the printing process. The past data related to the printing process includes the measurement value of sound pressure measurement unit 13 and the elapsed time after the start of the printing process, the measurement value of charge amount measurement units 16 and 17 and the elapsed time after the start of the printing process, and the correlation between these measurement values, the elapsed time, and the adhesion state of paper powder.

[0033] Next, the removal of foreign matter by the foreign matter removal system 10 in the carton printing system 1 will be described. For the carton C transported on the transport belt 2a and located upstream of the printing area A, the ionizer 14 measures the ion current value of the carton C and irradiates it with an ion pulse of a charge amount of polarity according to the measurement result. For example, if the transported carton C is positively charged, the ionizer 14 irradiates it with an ion pulse of a negative charge. This removes or reduces the amount of static charge on the carton C.

[0034] The carton C, from which the amount of static charge built up by the ionizer 14 has been removed or reduced, is transported to the printing area A. In the printing area A, laser light L is irradiated from the printer 3 onto the printing area CA of the carton C. The laser light is scanned according to the character shape, and the scanned printing area CA is peeled off in the character shape to expose the side 5, which is printed in the contrast between the color of the printing area CA and the color of the side 5.

[0035] When the printing process is performed, ionized air AR is supplied in advance from the nozzle 21a of the static elimination head 21, and air is sucked in by the dust collector 12. For the ionized air AR supplied from the static elimination head 21, the sound pressure measuring unit 13 measures the sound pressure accompanying the supply of the ionized air AR, and outputs the measured sound pressure signal to the calculation unit 31 of the control unit CONT via the low-pass filter 18. The calculation unit 31 uses the input sound pressure signal to sequentially perform time data processing, sound pressure calculation processing, and statistical value processing.

[0036] 4 is a diagram showing the relationship between the magnitude of the flow rate of the ionized air AR supplied from the static elimination head 21 and the sound pressure. In FIG. 4, the magnitude of the flow rate of the ionized air AR is shown as a speed controller angle (deg). When the sound pressure calculated by the calculation unit 31 is, for example, 5×10 8 (Pa), the speed controller angle is approximately 180 (deg). 9 In the case of (Pa), the speed controller angle is approximately 540 (deg).

[0037] Therefore, the control unit CONT controls the static elimination controller 22 to reduce the sound pressure obtained from the measurement result of the sound pressure measurement unit 13 to 5×10 8 (Pa) or more, 2×10 9 (Pa), it becomes possible to control the magnitude of the flow rate of the ionized air AR supplied from the static elimination head 21 to a speed controller angle of 180 (deg) or more and 540 (deg) or less. Therefore, by using the sound pressure obtained from the measurement result of the sound pressure measuring unit 13 as a parameter instead of the air pressure, the control unit CONT can control the magnitude of the flow rate of the ionized air AR supplied from the static elimination head 21 with high precision.

[0038] In addition, the control unit CONT rotates the nozzle 21a to control the direction of the ionized air AR supplied from the nozzle 21a and the height position of the nozzle 21a, thereby increasing the sound pressure obtained from the measurement result of the sound pressure measurement unit 13 by 5×10 8 (Pa) or more, 2×10 9 (Pa) or less, the magnitude of the flow rate of the ionized air AR supplied from the nozzle 21a can be controlled by the speed controller angle between 180 (deg) or more and 540 (deg) or less.

[0039] Fig. 5 is a diagram showing the relationship between the flow rate of the ionized air AR supplied from the nozzle 21a and the charge reduction amount. In Fig. 5, the flow rate of the ionized air AR is shown by the Pa ratio. As shown in Fig. 5, by setting the Pa ratio in the flow rate of the ionized air AR to 30 or more and 140 or less, the charge reduction amount can be set to approximately 1.8 kV or more and 2.1 kV. By setting the charge reduction amount to approximately 1.8 kV or more and 2.1 kV, the charge amount can be maintained at zero, and the re-adhesion of paper powder to the carton C can be suppressed.

[0040] Furthermore, when the printing process is performed, the charge amount measuring unit 16 measures the charge amount on the upstream side in the printing area A, and the charge amount measuring unit 17 measures the charge amount on the downstream side in the printing area A. The charge amount measuring units 16 and 17 each measure the charge amount near the suction port 12C in the dust collection duct 12A, and output the measured charge amount signals to the calculation unit 31 of the control unit CONT. The calculation unit 31 uses the input charge amount signals to sequentially perform time data processing and statistical value processing.

[0041] The control unit CONT controls the operation of the suction device 12B according to the amount of charge calculated by the calculation unit 31. Specifically, when the amount of charge near the suction port 12C in the dust collection duct 12A exceeds a threshold, the control unit CONT increases the suction amount of the suction device 12B to increase the dust collection power. As a result, the charged air and paper dust are collected and discharged, so that reattachment to the carton C can be suppressed.

[0042] Furthermore, when the charge amount measured by the charge amount measuring units 16 and 17 calculated by the calculation unit 31 is large, the control unit CONT can promote collection of the charged air and paper dust by rotating the nozzle 21a and controlling the direction of the ionized air AR supplied from the nozzle 21a. The appropriate direction of the ionized air AR can be determined, for example, by storing the direction of the ionized air AR and the charge amount measured by the charge amount measuring units 16 and 17 in association with each other when the nozzle 21a is rotated, and setting the direction of the ionized air AR at the time when the charge amount measured by the charge amount measuring units 16 and 17 becomes the minimum value.

[0043] Furthermore, the control unit CONT can perform machine learning based on past data related to the printing process stored in the memory unit 32 and on at least the result of computationally processing the wind pressure of the ionized air AR, and can feedback control the volume of the ionized air AR supplied by the static elimination head 21. The targets of machine learning can be the result of computationally processing the wind pressure of the ionized air AR, as well as the result of computationally processing the charge amounts measured by the charge amount measuring units 16 and 17.

[0044] Various feedback control algorithms can use the MT method, which uses Mahalanobis distance to store normal samples as a judgment process and calculate the distance from those values; SVM, also known as a support vector machine, which is a type of supervised machine learning that repeatedly learns conditions through regression and classification of data; and the RF method, known as a random forest, which is a type of supervised machine learning that combines multiple predictive models called decision trees.

[0045] FIG. 6 is a diagram showing the relationship between the amount of charge and the elapsed time after the start of the printing process. As shown in Fig. 6, the charge amount increases as the time elapsed after the start of printing process increases. Therefore, the time elapsed after the start of printing process and the charge amount have a data correlation for determining the adhesion state of paper powder, and therefore have the characteristic that the above-mentioned MT method and machine learning algorithms can be easily applied.

[0046] The control unit CONT feedback controls the volume of the ionized air AR supplied by the static elimination head 21 based on past data related to the printing process, the results of calculation of the wind pressure of the ionized air AR, and the results of calculation of the charge amount measured by the charge amount measuring units 16 and 17, thereby making it possible to always set an appropriate volume of the ionized air AR depending on the conditions of the past printing process.

[0047] The cartons C that have been printed are transported by the conveyor belt 2a to the downstream side of the printing area A. For the cartons C located downstream of the printing area A, the ionizer 15 measures the ion current value of the cartons C and irradiates them with an ion pulse of a charge amount of a polarity according to the measurement result. For example, if the cartons C that have been printed are positively charged, the ionizer 15 irradiates them with an ion pulse of a negative charge. This removes or reduces the amount of static charge on the cartons C.

[0048] As described above, in the foreign matter removal system 10 of this embodiment, the static elimination controller 22 is controlled in accordance with the wind pressure of the ionized air AR supplied from the nozzle 21a, and the flow rate of the ionized air AR supplied from the static elimination head 21 is controlled, thereby making it possible to stably collect foreign matter such as paper powder. EXAMPLES

[0049] The effects of the present invention will be made clearer by the following examples. Note that the present invention is not limited to the following examples, and can be appropriately modified and implemented without departing from the gist of the present invention.

[0050] (Examples 1 to 3, Comparative Example 1) In this example, a foreign matter removal system was installed in a carton printing system according to the specifications shown in Table 1 below. The following devices were used in the foreign matter removal system.

[0051] Anti-static head...Manufacturer: Keyence Corporation, Model: SJ-M020G, Quantity: 1 unit. Static electricity elimination controller...Manufacturer: Keyence Corporation, Model: SJ-M200, Quantity: 1 unit. Dust collection duct...Manufacturer: Kyoto Seisakusho, width 130mm x 20mm, quantity: 1 unit. Suction device...Manufacturer: Domino UK Ltd, model: DPX-2000, quantity: 1 piece. Printing device...Manufacturer: Keyence Corporation, Model: MD-U1000C, Quantity: 1 unit. Ionizer...Manufacturer: Keyence Corporation, Model: SJ-H036, Quantity: 2 units. Sound pressure measuring unit...Manufacturer: Ono Sokki Co., Ltd., Model: MI-1234, Quantity: 1 unit. Low pass filter...Manufacturer: Ono Sokki Co., Ltd., Model: AU-3100, Quantity: 1 piece. Charge amount measuring unit...Manufacturer: Keyence Corporation, Model: SK-050, Quantity: 2 units. Sequencer...Manufacturer: Mitsubishi Electric Corporation, Model: MELSEC IQ-R, Configuration: CPU / Analog / Input / Output / Base / Sensor / Power Supply / High-speed IO control units.

[0052] Example 1 is a sample after printing using a foreign matter removal system that does not have a sound pressure measuring unit and an ionizer, and has a static elimination head without a nozzle. Example 2 is a sample after printing using a foreign matter removal system that has a sound pressure measuring unit and an ionizer, a static elimination head with a nozzle, and performs rotation control of the nozzle and flow rate control of the ionized air using the measurement results of the sound pressure measuring unit and the measurement results of the charge amount measuring unit. Example 3 is a sample after printing using a foreign matter removal system that has a sound pressure measuring unit and an ionizer, a static elimination head with a nozzle, and performs flow rate control of the ionized air using the measurement results of the sound pressure measuring unit and the measurement results of the charge amount measuring unit, but does not perform rotation control of the nozzle. Comparative Example 1 is a sample after printing using a foreign matter removal system that does not have a sound pressure measuring unit, an ionizer, and a static elimination head, and does not supply ionized air.

[0053] [Table 1]

[0054] Fig. 7 is a diagram showing the average charge amount in the print area after the print process for the samples of the above-mentioned Examples 1 to 3 and Comparative Example 1. Fig. 8 is a diagram showing the rejection rate of cartons that were rejected due to the inspection result being defective for the samples of the above-mentioned Examples 1 to 3 and Comparative Example 1.

[0055] 7, in the samples of Examples 1 to 3 in which ionized air was supplied, the average amount of charge in the printing area was able to be reduced to approximately 3% or less compared to the sample of Comparative Example 1 in which ionized air was not supplied. In particular, in the samples of Examples 2 and 3 in which the flow rate of ionized air was controlled based on the measurement results of the sound pressure measurement unit, the average amount of charge in the printing area was able to be reduced to approximately 0.6% compared to the sample of Comparative Example 1 in which ionized air was not supplied.

[0056] Because the average charge amount in the printing area can be reduced, the samples of Examples 1 to 3 in which ionized air is supplied were able to reduce the rejection rate in which the inspection results were bad and the cartons were ejected by 15% or more compared to the sample of Comparative Example 1 in which ionized air is not supplied, as shown in Table 1 and Figure 8. In particular, the samples of Examples 2 and 3 in which the flow rate of ionized air was controlled based on the measurement results of the sound pressure measurement unit were able to reduce the rejection rate in which the inspection results were bad and the cartons were ejected by approximately 57% or more.

[0057] Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0058] For example, in the above embodiment, a configuration is exemplified in which the suction amount of the suction device 12B is increased to increase the dust collection force based on the measurement results of the charge amount measuring units 16 and 17, but the present invention is not limited to this configuration. A configuration may be adopted in which the control unit CONT controls the strength of the ionizers 14 and 15 based on the measurement results of the charge amount measuring units 16 and 17. By adopting this configuration, for example, when the charge amount measured by the charge amount measuring unit 16 is large, the control unit CONT may increase the strength of the ionizer 14, and when the charge amount measured by the charge amount measuring unit 17 is large, the control unit CONT may increase the strength of the ionizer 15.

[0059] In the above embodiment, the nozzle 21a is rotatable in the circumferential direction about an axis extending in the X direction, but the present invention is not limited to this configuration. The nozzle 21a may be rotatable in the X direction along the transport direction in addition to the circumferential direction. In addition to the configuration in which the nozzle 21a rotates, the static elimination head 21 itself may be rotatable in the above rotation direction.

[0060] In the above embodiment, the foreign matter removal system 10 is installed in the carton printing system 1, but the configuration is not limited to this. The foreign matter removal system 10 is widely applicable to various processing devices that perform predetermined processing on the processing area of ​​the transported cartons C. [Explanation of symbols]

[0061] REFERENCE SIGNS LIST 1...carton printing system, 2...conveyor device, 2a...conveyor belt (conveyor path), 3...printing device, 10...foreign matter removal system, 12...dust collection device, 12C...suction port, 13...sound pressure measurement section (acoustic sensor), 14, 15...ionizer, 16, 17...charge amount measurement section (charge sensor), 18...low-pass filter, 21...static charge removal head, 21a...nozzle, 22...static charge removal controller, 32...memory section, AR...ionized air, C...carton, CA...printing area (processing area), CONT...control section

Claims

1. A conveying device that conveys a carton having a printing area along a conveying path; a printing device that prints characters by irradiating the printing area with a laser beam; a foreign matter removal system for removing foreign matter generated when the characters are printed; Equipped with The foreign matter removal system includes: a static elimination head that is disposed facing a processing area of ​​a carton that is transported along a transport path and in which a predetermined processing is performed, and that supplies ionized air; a static elimination controller that adjusts the volume of the ionized air supplied from the static elimination head; a dust collector disposed outside the transport path and below the processing area; a control unit that controls the static elimination controller in accordance with a wind pressure of the ionized air supplied from the static elimination head to control a volume of the ionized air supplied from the static elimination head; A carton printing system comprising a foreign matter removal system having a

2. a sound pressure measuring unit that measures a sound pressure caused by the supply of the ionized air in the static elimination head, The control unit controls the volume of the ionized air by using the sound pressure measured by the sound pressure measuring unit as the air pressure.

2. The carton printing system of claim 1.

3. A low-pass filter is provided to remove high-frequency components from the sound pressure measured by the sound pressure measuring unit.

3. The carton printing system of claim 2.

4. the static elimination head has a nozzle for blowing out the ionized air, and is disposed outside the transport path; The nozzle is capable of changing a height position and a direction in which the ionized air is blown out, The control unit controls a height position of the nozzle and a direction in which the ionized air is blown out in accordance with a measurement result of the sound pressure measurement unit.

4. The carton printing system according to claim 2 or 3.

5. The conveying path includes one or more ionizers disposed on each of the upstream side and the downstream side of the static elimination head.

5. A carton printing system according to claim 2.

6. a charge amount measuring unit that measures the amount of charge at each of positions on the upstream side and downstream side of the charge removal head in the transport path, The control unit controls the intensity of the ionizer in accordance with the measurement result of the charge amount measuring unit.

6. The carton printing system of claim 5.

7. The sound pressure measuring unit is disposed above the carton, The charge amount measuring unit is disposed near a suction port of the dust collecting device.

7. The carton printing system of claim 6.

8. a memory unit for storing past data relating to the predetermined processing; The control unit performs machine learning based on the data stored in the memory unit and a result of arithmetic processing of at least the wind pressure of the ionized air, and performs feedback control of the volume of the ionized air supplied by the static elimination head. A carton printing system according to any one of claims 1 to 7.

9. The printing area is disposed toward the outside of the transport path.

9. A carton printing system according to any one of claims 1 to 8.

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