TW202325257A - Tablet printing device and tablet printing method - Google Patents

Abstract

The purpose of the present invention is to efficiently print tablets. A tablet printing device (1) according to an embodiment is provided with: a detection unit (for example, a sensor (30), a first imaging unit (40), and a second imaging unit (60)) that detects a tablet (T) conveyed by a conveyor belt (21); an inkjet head (51) that prints on the tablet (T) detected by the detection unit; a cover part (70) covering the detection part; an air blowing unit (81) that blows air in a direction that horizontally intersects the conveying direction (H1) of the tablets (T) in plan view with respect to the surface of the cover unit (70) on the conveyor belt (21) side; and a control unit (for example, a control device (100)) that controls the blowing unit (81).

Description

Tablet printing device and tablet printing method

Embodiments of the present invention relate to a tablet printing device and a tablet printing method.

At present, in order to print various information such as identification information on tablets, a tablet printing device that prints using an inkjet head has been developed. In this tablet printing device, a detection unit such as a sensor or a camera is used to detect a tablet to be printed. On the cover of the detection unit, foreign matter such as tablet powder or waste may adhere. Due to the adhesion of the foreign matter, the detection unit may erroneously detect the tablet, and efficient printing on the tablet may not be possible. [Prior Art Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open No. 2019-58220

[Problem to be solved by the invention]

The problem to be solved by the present invention is to provide a tablet printing device and a tablet printing method capable of printing tablets efficiently. [Technical means to solve the problem]

A tablet printing device according to an embodiment of the present invention includes: a detection unit that detects a tablet conveyed by a conveyor belt; an inkjet head that prints on the tablet detected by the detection unit; and a cover unit that covers the tablet. The detection unit; the air blowing unit that blows gas to the surface of the cover on the conveyor belt side in a direction horizontally intersecting the conveying direction of the tablet in plan view; and the control unit that controls the air blowing unit.

A tablet printing method according to an embodiment of the present invention includes the following steps: a detection unit detects a tablet conveyed by a conveyor belt; an inkjet head prints the tablet detected by the detection unit; an air blowing unit covers the detection unit. The surface of the cover part of the part on the side of the above-mentioned conveyor belt blows gas in a direction horizontally intersecting with the conveying direction of the above-mentioned tablet in a plan view; and the control part controls the above-mentioned blowing part. [Effect of Invention]

According to the embodiment of the present invention, it is possible to efficiently print on tablets.

＜First Embodiment＞ A first embodiment will be described with reference to FIGS. 1 to 11 .

(Example of configuration of tablet printing device) A configuration example of the tablet printing apparatus 1 according to the first embodiment will be described with reference to FIGS. 1 to 4 .

As shown in FIGS. 1 and 2 , the tablet printing apparatus 1 according to the first embodiment includes a supply unit 10, a transport unit 20, a sensor 30, a first imaging unit 40, a printing unit 50, a second imaging unit 60, a cover Part 70, air blowing device 80, recovery part 90 and control device 100. The sensor 30 , the first imaging unit 40 , and the second imaging unit 60 each function as a detection unit that detects the tablet T.

The supply unit 10 has a hopper 11 and an injection machine 12 . The supply unit 10 is configured to be positioned at one end side of the conveyance unit 20 , and is configured to be able to supply the tablet T, which is a printing target, to the conveyance unit 20 . The hopper 11 stores a plurality of tablets T, and supplies the stored tablets T to the injection machine 12 sequentially. The injection machine 12 arranges the tablets T supplied from the hopper 11 in a row, and supplies them to the conveyance part 20 . The supply part 10 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 .

The conveying unit 20 has a conveying belt 21 , a driving pulley 22 , a plurality of driven pulleys 23 , a motor 24 , a position detector 25 , and a suction chamber 26 . The conveyor belt 21 is an endless belt, and is stretched over the drive pulley 22 and each driven pulley 23 . The driving pulley 22 and each driven pulley 23 are rotatably disposed on the device body (not shown), and the driving pulley 22 is connected to a motor 24 . The motor 24 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 . The position detector 25 is a device such as an encoder, and is attached to the motor 24 . The position detector 25 is electrically connected to the control device 100 and sends a detection signal to the control device 100 . The conveying part 20 rotates the driving pulley 22 of the motor 24 so that the conveying belt 21 and each driven pulley 23 rotate together, and the tablet T on the conveying belt 21 is conveyed along the rotation direction of the arrow H1 in FIG. 1 , that is, the conveying direction H1. .

A plurality of circular suction holes 21a are formed in the conveyor belt 21 (see FIG. 2 ). These suction holes 21a are respectively through holes for sucking the tablets T, and are arranged in a row along the conveyance direction H1 so as to form one conveyance path. Each suction hole 21 a is connected to the inside of the suction chamber 26 via a suction path (not shown) formed in the suction chamber 26 (see FIG. 1 ), and suction can be obtained by the suction chamber 26 . A pump is connected to the suction chamber 26 through a suction tube (both not shown in the figure), and the pressure in the suction chamber 26 is reduced by the operation of the pump. The suction pipe is connected to the approximate center of the side surface (the surface parallel to the conveyance direction H1 ) of the suction chamber 26 . Moreover, the pump is electrically connected to the control device 100 , and its driving is controlled by the control device 100 . When the pressure in the suction chamber 26 is reduced, the tablets T placed on the respective suction holes 21 a of the conveyor belt 21 are sucked by the suction holes 21 a and held on the conveyor belt 21 .

The sensor 30 is positioned on the downstream side in the conveyance direction H1 from the position where the supply unit 10 is provided, and is installed above the conveyor belt 21 . The sensor 30 detects the tablet T (arrival of the tablet T) that arrives at the detection position directly below the sensor 30 by projecting and receiving the laser light, that is, the X direction of the tablet T on the conveyor belt 21 (refer to Figure 2) position. As the sensor 30, for example, a displacement sensor, a proximity sensor, or the like is used. Also, as the displacement sensor, various laser sensors such as reflective laser sensors are used. The sensor 30 is electrically connected to the control device 100 and sends a detection signal to the control device 100 .

The first imaging unit 40 is positioned on the downstream side in the conveyance direction H1 than the position where the sensor 30 is provided, and is installed above the conveyor belt 21 . Based on the X-direction position information of the tablet T detected by the sensor 30, the first imaging unit 40 takes pictures at the first imaging timing when the tablet T reaches the imaging position directly below the first imaging unit 40, and obtains Including the first image of the upper surface of the tablet T, the obtained first image is sent to the control device 100 . The first image is used to detect the position of the tablet T in the X direction, the Y direction, and the θ direction (refer to FIG. 2 ), and to detect whether the tablet T is cracked, damaged, or contaminated (such as foreign matter attached). As the first imaging unit 40 , various cameras having imaging elements such as CCD (Charge Coupled Device: Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor: Complementary Metal Oxide Film Semiconductor) are used. The first imaging unit 40 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 . In addition, if necessary, lighting for photography is also provided.

Here, the position of the tablet T in the X direction and the Y direction is, for example, the position of the XY coordinate system to which the center (reference position) of the imaging area of the 1st imaging part 40 corresponds. Also, the position in the θ direction is, for example, a position indicating the degree of rotation of the tablet T with respect to the center line of the imaging area of the first imaging unit 40 in the Y direction. The position in the θ direction is detected when the tablet T is provided with a secant line, or when the tablet T is shaped into an ellipse, oblong circle, or quadrangle, etc., when the tablet T is a directional shape.

The printing unit 50 has an inkjet head 51 . The inkjet head 51 is positioned on the downstream side in the conveyance direction H1 from the position where the first imaging unit 40 is provided, and is installed above the conveyance belt 21 . The inkjet head 51 has a plurality (for example, hundreds to thousands) of nozzles 51a (refer to FIG. 2 ), and the nozzles 51a are arranged in a row (nozzle row) in a horizontal plane perpendicular to the conveyance direction H1 (an example of a cross). ) to set. The inkjet head 51 ejects ink individually from each nozzle 51 by the operation of the drive element of each nozzle 51a. As the inkjet head 51 , various inkjet printing heads having drive elements such as piezoelectric elements, heating elements, and magnetostrictive elements are used. The inkjet head 51 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 .

The second imaging unit 60 is positioned on the downstream side in the conveying direction H1 from the position where the printing unit 50 is provided, and is installed above the conveying belt 21 . Based on the X-direction position information of the tablet T detected by the sensor 30, the second imaging unit 60 takes pictures at the second imaging timing when the tablet T reaches the imaging position immediately below the second imaging unit 60, and obtains Including the second image of the upper surface of the tablet T, the acquired second image is sent to the control device 100 . The second image is used to check the printed pattern printed on the tablet T. As the second imaging unit 60 , as in the above-mentioned first imaging unit 40 , various cameras having imaging elements such as CCD and CMOS, for example, are used. The second imaging unit 60 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 . Lighting for photography is also provided as needed.

As shown in FIGS. 1 to 3 , the cover portion 70 is a housing for housing the sensor 30 , the first imaging unit 40 , the inkjet head 51 of the printing unit 50 , and the second imaging unit 60 . The cover portion 70 is spaced from the upper surface of the conveyor belt 21 by a specific distance ( For example, 5-12mm), it is set above the upper surface of the conveyor belt 21 . In addition, for example, when installing lighting for imaging (for example, line lighting or ring lighting), the lighting is also installed in the cover portion 70 .

As shown in FIG. 3 , four through-holes 70 a , 70 b , 70 c , and 70 d are formed on the lower surface of the lid portion 70 along the conveyance direction H1 . The sensor 30 in the cover part 70 is provided at a position facing the through hole 70a, and can detect the tablet T on the conveyor belt 21. In addition, the first imaging unit 40 in the cover unit 70 is provided at a position facing the through hole 70b, and can take an image of the tablet T on the conveyor belt 21 . The inkjet head 51 in the cover part 70 is inserted into the through-hole 70c and installed, and can print on the tablet T on the conveyance belt 21. The second imaging part 60 in the cover part 70 is provided at a position facing the through hole 70d, and can take an image of the tablet T on the conveyor belt 21 .

The respective through-holes 70a, 70b, and 70d are closed with light-transmitting members 71, 72 such as glass. Each light-transmitting member 71 is, for example, respectively disposed on the inner bottom surface of the cover portion 70 . Moreover, the through-hole 70c is closed by inserting the inkjet head 51 into the through-hole 70c through the sealing member 73, such as silicon. In this way, the lid portion 70 is formed in a hermetically sealed state, and the inside of the lid portion 70 maintains, for example, a positive pressure (positive pressure). In addition, if each of the light-transmitting members 71, 72 can close the respective through-holes 70a, 70b, 70d, then, for example, it can also be installed in each of the through-holes 70a, 70b, 70d, and can also be installed outside the cover portion 70. surface.

The air blowing device 80 has a plurality of air blowing parts 81 as shown in FIGS. 1 to 3 . These air blowing parts 81 correspond to the respective through holes 70a, 70b, 70d, that is, the sensor 30, the first imaging part 40, and the second imaging part 60, and are provided on the lower surface of the cover part 70. Each air blowing portion 81 blows out gas in a direction (Y direction: refer to FIG. 2 ) horizontally perpendicular to the conveying direction H1 in plan view, toward the lower surface of the cover 70 (the surface of the cover 70 on the conveyor belt 21 side), That is, gas is blown onto the lower surfaces of the light-transmitting members 71, 72 that seal the through-holes 70a, 70b, 70d. As the gas, for example, air, nitrogen or the like is used. Each air blowing part 81 is electrically connected to the control device 100 , and the drive of each is individually controlled by the control device 100 .

As shown in FIG. 4 , the gas blowing unit 81 blows gas to the lower surface of the transparent member 71 that closes the through hole 70 a, and blows the gas to the lower surface of the transparent member 71 , but is not limited thereto. For example, the direction in which the blowing part 81 blows out the gas (the blowing direction of the gas) can be toward the lower surface of the light-transmitting member 71, that is, the direction of the lower surface of the cover 70, or toward the vicinity or surroundings of the lower surface of the cover 70. direction. That is, when the gas blown from the blowing part 81 reaches the lower surface of the cover part 70, the blowing direction of the gas is not particularly limited.

Returning to FIG. 1 and FIG. 2 , the recovery unit 90 is positioned on the downstream side in the transport direction H1 of the position where the second imaging unit 60 is provided, and is provided at the end of the transport unit 20 on the downstream side in the transport direction H1 . When the tablet T on the conveyor belt 21 of the conveying unit 20 reaches a specific position, for example, the downstream end of the conveying unit 20 in the conveying direction H1, the holding of the tablet T is released. The collection part 90 is comprised so that the tablet T which fell from the holding|maintenance of the conveyance part 20 will be released, and it will collect into a defective product and a good product. For example, by blowing air on the tablet T that is in the middle of falling, changing the falling direction of the tablet T according to the defective product and the good product, or changing the falling path by using a plate and other components, so that the falling tablet T can be divided into defective products and good products. And recycling. For example, defective products are non-printed ingots or ingots with unqualified printing, etc., and good products are ingots with qualified printing. In addition, as non-printed ingots, non-printed ingots with foreign matter attached (non-printed ingot with foreign matter attached) or non-printed ingot with no foreign matter attached (non-printed ingot with no foreign matter attached), these non-printed ingots can also be distinguished as Recycle. The recovery unit 90 is electrically connected to the control device 100 , and its driving is controlled by the control device 100 .

The control device 100 controls each part of the tablet printing device 1 based on various information and various programs, such as the supply part 10 or the conveyance part 20, the sensor 30, the first imaging part 40, the printing part 50, the second imaging part 60, the blower Gas device 80, and recovery unit 90, etc. Furthermore, the control device 100 receives detection information (such as a detection signal) and the like transmitted from the position detector 25 or the sensor 30 , and also receives image information and the like transmitted from the first imaging unit 40 or the second imaging unit 60 . The control device 100 is realized by, for example, an electronic circuit such as an integrated circuit, a computer, or the like.

(Example of the configuration of the control device) Next, a configuration example of the control device 100 will be described with reference to FIG. 5 .

As shown in FIG. 5 , the control device 100 has an image processing unit 101 , a memory unit 102 , and a control unit 103 . An input device 100 a or an output device 100 b is connected to the control device 100 . The input device 100a is realized by, for example, a switch or a touch panel, a keyboard, a mouse, and the like. In addition, the output device 100b is realized by, for example, a display, a lamp, a meter, and the like.

The image processing unit 101 acquires the first image captured by the first imaging unit 40 and the second image captured by the second imaging unit 60, and processes the images using a well-known image processing technique. For example, the image processing unit 101 processes the first image obtained by the first imaging unit 40 to obtain the presence or absence of cracks, defects, dirt, etc. of the tablet T, and further obtains the X-direction, Y-direction and θ of the tablet T. The location of the direction. Also, the image processing unit 101 processes the second image obtained by the second imaging unit 60 to obtain the printing position, shape, and size of the printing pattern (for example, characters or marks) printed on the tablet T. The image processing unit 101 obtains information on whether the tablets T are cracked or damaged, dirt, the obtained position information of each tablet T in the X direction, the Y direction, and the θ direction, and then prints the printed pattern on each tablet T The position information, shape information and size information are sent to the control unit 103 .

The storage unit 102 stores processing information, various programs, and the like. For example, it can be implemented by semiconductor memory elements such as RAM (Random Access Memory) and flash memory (Flash Memory), or memory devices such as hard disks and optical disks. The printing data related to printing, the moving speed data of the conveyor belt 21, and the like are stored in the memory unit 102 . Printed materials include printed pattern information such as text or marks.

The control unit 103 is, for example, a computer such as a CPU (Central Processing Unit: Central Processing Unit) or an MPU (Micro Processor Unit: Micro Processing Unit), and controls each unit. For example, the control unit 103 controls the supply unit 10 or the transport unit 20, the sensor 30, the first imaging unit 40, the printing unit 50, the second imaging unit 60, and the collection unit based on various information or various programs stored in the memory unit 102. 90. An image processing unit 101, a storage unit 102, and the like. Moreover, the control part 103 receives the detection signal etc. which were sent from the sensor 30 or the position detector 25. In addition, the control unit 103 is realized by one or both of hardware and software, for example.

For example, the control unit 103 always drives the blowing units 81 of the blowing device 80 . In detail, the control part 103 controls each blowing part 81 so that each blowing part 81 blows out gas at all times. Correspondingly, each gas blowing portion 81 blows out gas all the time, and blows gas onto the lower surface of the cover portion 70 . The gas blown out from each blowing part 81 is blown to the lower surface of each transparent member 71, 72 of the cover 70, and the foreign matter (such as powder or waste) attached to the lower surface of each transparent member 71, 72 is removed. In addition, the control device 100 can control the regulating valves (not shown) provided in the pipes (not shown) respectively connected to the blowing parts 81 to individually adjust the flow rate or flow rate of the gas blown out from the blowing parts 81 respectively. Usually, the flow rate or flow rate of the gas blown out from each blowing part 81 is preset, for example, memorized in the memory part 102 . However, the flow rate or flow rate of the gas blown out from each blowing part 81 can be changed according to specific conditions, or can be changed according to the user's input operation on the input device 100a. In addition, the flow velocity or the flow rate of the gas from each blowing part 81 can be set according to the diameter or shape of the tablet T, and the conveying speed of the tablet T, by obtaining the optimum one through experiments in advance.

Moreover, the control unit 103 obtains the position of the tablet T on the conveyor belt 21 in the X direction based on the detection information sent from the sensor 30, that is, the timing of detecting the tablet T on the conveyor belt 21, and displays the tablet T The position information of the position in the X direction of the first imaging unit 40 is used to set the first imaging timing of the first imaging unit 40, the printing start timing of the inkjet head 51 of the printing unit 50, and the second imaging timing of the second imaging unit 60 to generate and display these timings. The timing information is stored in the memory unit 102 . The printing start timing means the timing at which printing starts on the tablet T which has reached the printing position directly under the inkjet head 51 . In addition, the control unit 103 can acquire information such as the movement amount (rotation amount) or the speed of the conveyor belt 21 based on the detection information sent from the position detector 25 .

Furthermore, the control unit 103 sets whether or not to print on the tablet T for which the presence or absence information is obtained, based on the information on the presence or absence of the tablet T sent from the image processing unit 101 . Then, the control unit 103 sets printing conditions for the tablet T set to be printable. At this time, the control unit 103 sets the printing conditions for the tablet T for which the position information is obtained based on the position information of the tablet T in the X direction, the Y direction, and the θ direction transmitted from the image processing unit 101 . For example, the control unit 103 determines the range of the nozzles 51a used for printing on the target tablet T in the inkjet head 51 based on the position information or printing data in the Y direction of the tablet T, that is, the range of the used nozzles, and the setting includes the range of the used nozzles. Or printing conditions such as printing start timing. Also, when the tablet T has a directional shape, the control unit 103 sets the printing conditions corresponding to the position of the tablet T in the θ direction based on the position information of the tablet T in the θ direction. As an example, the control unit 103 pre-registers in the memory unit 102 about 180 printed patterns in which the direction of the printed pattern is rotated step by step within the range of 0° to 179°, and selects the θ suitable for the tablet T from these printed patterns. The printing pattern of the direction, the position and the angle, and set the printing conditions.

In addition, the control unit 103 determines whether the printed pattern is printed on a specific part of the tablet T with a specific shape and a specific size based on the printing position information, shape information, and size information of the printed pattern printed on the tablet T sent from the image processing unit 101. position, that is, whether the printing pattern is normally printed on the tablet T (printing state inspection). For example, in judging the shape and size of the printed pattern, the control unit 103 pre-registers the printed pattern for inspection in the memory unit 102, and compares the printed pattern for inspection with the printed pattern on the tablet T after printing (printed). Printed pattern on tablet T) for comparison.

In addition, the control unit 103 properly stores various information (for example, whether the tablet T is broken or damaged, dirt information and location information, timing information, printing conditions, printing quality information, etc.) After collecting the target tablet T, the unit 90 deletes various information from the memory unit 102 when, for example, a certain time (for example, several seconds) elapses after dropping from the downstream end of the transport unit 20 in the transport direction H1. However, when such information is required in subsequent steps, etc., various information of each tablet T may be retained without deleting, or may be stored in a storage medium outside the device. When storing various information of each tablet T in advance, the information can also be stored in association with the date of manufacture or lot number, etc., and it is possible to check the printed tablet T for defective products after shipment, etc. Retrace, and investigate the cause.

(printing steps) Next, the printing steps performed by the aforementioned tablet printing device 1 will be described with reference to FIGS. 1 and 2 . The printing step also includes an inspection step. In addition, various information such as data required for printing and data required for blowing gas are stored in the memory unit 102 in advance.

When the tablet printing device 1 starts the printing process, the motor 24 is driven, and the conveyor belt 21 rotates in the conveying direction H1 along with the rotation of the driving pulley 22 and the driven pulley 23 of the motor 24 . With the conveyor belt 21 rotating in the conveying direction H1, the tablets T are sequentially supplied from the hopper 11 to the injection machine 12, arranged in a row by the injection machine 12, and randomly supplied on the conveyor belt 21 without a specific interval. The tablets T supplied on the conveyor belt 21 are arranged in a row on the conveyor belt 21 and conveyed at a specific moving speed.

The tablet T on the conveyor belt 21 is detected by the sensor 30 . In detail, the timing at which the tablet T on the conveyor belt 21 reaches the detection position directly under the sensor 30 (such as the irradiation position of laser light) is detected by the sensor 30, based on the detection of the tablet T Sequentially, the X-direction position of the tablet T on the conveyor belt 21 is recognized by the control unit 103 . And, the position information indicating the position of the tablet T in the X direction is generated by the control unit 103 and stored in the memory unit 102 .

Next, the tablet T on the conveyor belt 21 is photographed by the first imaging unit 40 . Specifically, the tablet T on the conveyer belt 21 is photographed by the first imaging unit 40 at the first imaging timing when it reaches the imaging position directly below the first imaging unit 40 , and will be captured by the first imaging unit 40 . The first image obtained by shooting is sent to the control device 100 . Based on the first image, the image processing unit 101 generates information on whether the tablet T is cracked, damaged, or stained, and also generates positional information of the tablet T in the X direction, Y direction, and θ direction, and stores it in the memory. Section 102. Based on the information of whether the tablet T is cracked, damaged, or dirty, it is set whether to print on the target tablet T, and based on the information such as the position information and the printing pattern of the tablet T in the X direction, Y direction, and θ direction, it is stored in the memory. 102 Setting includes printing conditions such as the nozzle range to be used for the tablet T set to be printable (printable tablet T), the printing start timing, and the like. In addition, the ejection timing to the tablet T (the timing at which ink is ejected to the tablet T) is determined based on the above-mentioned printing start timing (the timing at which printing is started on the tablet T).

Based on the printing conditions, printing is performed by the printing unit 50 . That is, the inkjet head 51 of the printing part 50 is controlled by the control part 103 so that a specific printing pattern may be printed on the printable tablet T on the conveyance belt 21. Specifically, the printable tablet T passing on the conveyor belt 21 below the first imaging unit 40 reaches the printing start timing of the printing position directly under the inkjet head 51. Based on the above printing conditions, the inkjet head 51 printed. In the inkjet head 51, ink is appropriately ejected from each nozzle 51a, and a printing pattern (for example, serial number, alphabet, katakana, symbol, figure) is printed on the upper surface of the tablet T, that is, the surface to be printed. The ink coated on the tablet T is dried during conveyance. In addition, a drying unit (not shown) for drying with gas or heat may be provided, and the ink may be dried by this drying unit.

Thereafter, the printed tablet T on the conveyor belt 21 is photographed by the second imaging unit 60 . Specifically, the printed tablet T on the conveyer belt 21 is photographed by the second imaging unit 60 at the second imaging timing when it reaches the imaging position directly below the second imaging unit 60, and will be captured by the second imaging unit 60. The second image captured by the part 60 is sent to the control device 100 .

The second image is analyzed by the image processing unit 101 of the control device 100 . Specifically, the image processing unit 101 acquires information related to the printed pattern printed on the tablet T, that is, the printed position, shape, and size of the printed pattern. The second image sent from the second imaging unit 60 is analyzed by the image processing unit 101 to generate inspection information showing the printing position, shape, and size of the printed pattern printed on the tablet T, and store it in the memory unit 102 .

Based on the inspection information, the printing state inspection is executed by the control unit 103 . In detail, based on the above-mentioned inspection information related to the printing position, shape, and size stored in the memory unit 102, the control unit 103 judges whether the printing pattern is normally printed on the tablet T, and generates information indicating whether the printing of the tablet T is good or bad. Print good or bad information, and save in the memory unit 102. For example, in the printing status inspection, the printed pattern used for printing is stored in the memory unit 102 as the printed pattern for inspection, and the specific printing position, shape, and size-related good product information of the printed pattern for inspection are stored in the The memory unit 102 compares the inspection information related to the printing position, shape, and size of the actual printed printing pattern to determine whether the printing pattern is normally printed on the tablet T (pass or fail).

Finally, the tablet T on the conveyor belt 21 is recovered by the recovery unit 90 . Specifically, when the inspected tablet T is located at the end of the downstream side of the conveyor belt 21 as the conveyor belt 21 moves, it is released from the state held by the conveyor belt 21, falls from the conveyor belt 21, and is recovered by Section 90 Recycling. At this time, the tablets T of qualified tablets fall directly, and are recovered as good products by the recovery part 90, but the tablets T of unqualified tablets or non-printed tablets are blown by air during the fall from the conveyor belt 21. It is separated from good products and recovered as defective products by the recovery unit 90 .

In such a printing step, gas is always blown from all the blowing units 81 . The gas blown out from all the blowing parts 81 is blown onto the lower surface of the cover 70, that is, the light-transmitting members facing the sensor 30, the first imaging part 40 and the second imaging part 60 in the cover part 70 71, 72 below the surface. Thereby, since the foreign matter attached to the lower surface of each light-transmitting member 71, 72, specifically, the lower surface of each light-transmitting member 71, 72 exposed from each through-hole 70a, 70b, 70d shown in FIG. (such as powder or waste) is removed, so it can prevent the sensor 30 from detecting foreign matter attached to the lower surface of the light-transmitting member 71 and falsely detect the tablet T, and prevent the first imaging unit 40 or the second imaging unit 60 from imaging The foreign matter attached to the lower surface of each light-transmitting member 71, 72 is partially photographed, and the tablet T is falsely detected. Moreover, since the gas is always blown out from all the air blowing parts 81, it is also possible to suppress foreign matter from adhering to the lower surfaces of the light-transmitting members 71, 72 exposed from the through holes 70a, 70b, and 70d. In this way, false detection due to adhesion of foreign matter can be suppressed, so that the tablet T can be printed efficiently.

Here, for example, when the sensor 30 detects a foreign object adhering to the lower surface of the light-transmitting member 71 , an erroneous detection occurs by misjudging the timing at which the tablet T comes directly under the sensor 30 . The incorrectly detected tablet T is not printed correctly, and the tablet T is discharged as a defective tablet (defective product). In addition, when the imaging units such as the first imaging unit 40 or the second imaging unit 60 capture and detect foreign matter adhering to the lower surfaces of the light-transmitting members 71 and 72, false detection of foreign matter adhering to the tablet T occurs. The erroneously detected tablet T is not printed, and the tablet T is discharged as a non-printed tablet (defective product). In this way, when foreign matter adheres to the lower surface of each light-transmitting member 71, 72, that is, the lower surface of the lid portion 70, efficient printing on the tablet T cannot be performed. Foreign matter is removed from the lower surface of the cover portion 70, and false detection due to foreign matter adhesion can be suppressed, and printing on the tablet T can be performed efficiently.

Moreover, the blowing direction of the gas of the blowing part 81 is the direction horizontally perpendicular to the conveyance direction H1 in planar view. Thereby, since the tablet T is exposed to the airflow at least only when it passes below the blowing part 81, it can suppress that the posture of the tablet T is affected by the gas blown from the blowing part 81. For example, it is considered that when the blowing direction of the gas from the blowing unit 81 is parallel to the conveying direction H1, the airflow will blow the plurality of tablets T arranged in the conveying direction for a long time, resulting in a change in the posture of the plurality of tablets T. When the posture of the tablet T changes, the position of the tablet T detected by the sensor 30 and the position or posture of the tablet T captured by the first imaging unit 40 change. That is, subsequent imaging and printing cannot be performed smoothly, and it is difficult to print on the tablet T efficiently. In addition, it is possible to suppress the influence of the gas blown from the gas blowing unit 81 on printing by the inkjet head 51 . For example, when the forward direction of the ink ejected from the inkjet head 51 is bent by the air flow, printing failure occurs, making it difficult to print efficiently on the tablet T. Therefore, the blowing direction of the gas is desirably in the direction horizontally intersecting with the conveyance direction H1 in a plan view, that is, avoiding the direction directly below the inkjet head 51 (for example, the direction not facing the downstream side of the conveyance direction H1), the most desirable It is a direction orthogonal to the conveyance direction H1.

In addition, when the tablet T to be printed is a tablet made of solidified powder such as a plain tablet or an OD tablet (orally disintegrating tablet), the powder of the tablet T is accumulated on the conveyor belt 21, or the powder floats , so it is easy to attach powder to the lower surface of the cover portion 70 . Therefore, the flow intensity of the gas blown from each blowing part 81 can also be changed according to the kind of tablet T. For example, when the type of tablet T is a plain tablet or an OD tablet, the flow of gas can also be enhanced, and when the type of tablet T is a tablet that is less prone to foreign matter (such as powder), the flow of gas can also be weakened , Also, it can return to the original strength after enhancing the flow of gas.

(Processing example of adjusting the blowing intensity of gas) Next, processing example 1 to processing example 6 of self-gas blowing intensity adjustment will be described with reference to FIGS. 6 to 11 . Each of these treatment examples 1 to 6 may be used alone, or may be used in combination appropriately in parallel or in series.

(processing example 1) As shown in FIG. 6 , in processing example 1, in step S1 , the control unit 103 controls each blowing unit 81 so that the flow of the gas blown out from each blowing unit 81 is at the first intensity. Thereafter, in step S2, the control unit 103 determines whether the state in which the sensor 30 detects the tablet T has been maintained for a predetermined time or longer.

In step S2, when the control unit 103 judges that the sensor 30 detects that the state of the tablet T has been maintained for more than a specific time (step S2 (Yes)), in step S3, the corresponding sensor in each blowing unit 81 is selected. The flow of the gas blown by the blowing part 81 of the detector 30 is set from the first intensity to the second intensity, and the blowing part 81 corresponding to the sensor 30 is controlled. Thereafter, the process returns to step S2. In addition, the second intensity is stronger than the first intensity (second intensity>first intensity).

On the other hand, in step S2, when the control unit 103 judges that the sensor 30 detects that the state of the tablet T has not been maintained for more than a specific time (No (No) in step S2), in step S4, the air blowing unit 81 The flow of the respectively blown gas is maintained at the first intensity, or the flow of the gas blown from the blowing portion 81 corresponding to the sensor 30 in each blowing portion 81 is returned from the second intensity to the first intensity , to control the air blowing part 81 corresponding to the sensor 30 . Thereafter, the process returns to step S2.

Here, the state of the tablet T detected by a sensor 30 such as a laser displacement meter means that the output value (detection value) of the sensor 30 is ON (connected), and the sensor 30 detects the state of the tablet T. Whether it has been maintained for a specific time or not is judged based on whether the output value of the sensor 30 is "ON" for a specific time or longer. The situation where the sensor 30 does not misdetect is repeated: every time the tablet T is transported directly under the sensor 30, it becomes "ON", and when the tablet T does not exist under the sensor 30, it becomes "ON". "OFF (disconnect)". That is, normally, the sensor 30 repeats "ON" and "OFF" alternately. In the event of an abnormality (during false detection), it remains "ON" for a certain period of time. This determination processing is also the same in other processing examples, for example.

Also, the first intensity or the second intensity is a specific value. The flow intensity of gas refers to the one that changes by changing the flow velocity or flow rate of gas. For example, by increasing the flow rate of the gas, or increasing the flow rate of the gas, the flow of the gas is enhanced, and conversely, by decreasing the flow rate of the gas, or reducing the flow rate of the gas, the flow of the gas is weakened. The above-mentioned specific time is set to be longer than the time in which the sensor 30 detects the tablet T in the normal time (other than abnormal time), for example. Information such as the first intensity, the second intensity, and the specific time are preset in the memory unit 102, and can also be changed according to the user's input operation on the input device 100a.

In addition, when the sensor 30 detects that the state of the tablet T has not been maintained for a specified time or longer, the control unit 103 controls the gas flow corresponding to the sensor 30 in such a manner that the flow of the gas returns from the second intensity to the first intensity. Blowing part 81, but not limited thereto, for example, in step S3, it is also possible to return the flow of gas from the second intensity to the first intensity after a specific time has elapsed after enhancing the flow of gas, and control the corresponding sensory intensity. The air blowing part 81 of the detector 30. In this case, the processing of step S4 may not be necessary.

In addition, the output device 100b, such as a display, a lamp, or a meter, can also be used to inform the user that the intensity of the gas flow is the first intensity or the second intensity, and that it is increased or decreased. Thereby, the user can know how strong the gas flow is.

According to this processing example 1, when the sensor 30 detects that the state of the tablet T has been maintained for a certain period of time or longer, it is determined that the object detected by the sensor 30 as the tablet T is not the tablet T but is attached to the tablet T. Foreign matter (such as powder or waste) on the lower surface of the light-transmitting member 71 corresponding to the sensor 30 and the flow of gas blown from the gas blowing part 81 corresponding to the sensor 30 are enhanced. Thereby, the foreign matter attached to the lower surface of the light-transmitting member 71 corresponding to the sensor 30, specifically, the lower surface of the light-transmitting member 71 exposed from the through hole 70a shown in FIG. The sensor 30 falsely detects that the tablet T is coming.

Here, the above-mentioned specific time is set to a time at which the possibility of the tablets T being connected and conveyed is significantly lower, such as a time longer than the time for the tablets T to pass through 10 tablets, for example. That is, it can be estimated that the time during which the sensor 30 continues to output "ON" not because the tablet T is connected and transported, but because foreign matter adheres to the cover 70, is obtained in advance by experiments, etc., and set the time.

In addition, although the detection of the tablet by the sensor 30 has been maintained for a certain time or longer in step S2, the flow of the gas is changed to the second intensity in step S3, but the tablet is continued for a certain time or longer by using the sensor 30 in step S2 again. In the case of detection, the processing can also be interrupted for maintenance processing. This point is also the same in the following processing examples 2 to 6.

(processing example 2) As shown in FIG. 7 , in processing example 2, in step S11 , the control unit 103 controls each blowing unit 81 so that the flow of the gas blown out from each blowing unit 81 is at the first intensity. Thereafter, in step S12, the control unit 103 judges whether the state of the tablet T detected by the sensor 30 has been maintained for a specific time or not, and in step S13, judges whether the image captured by the first imaging unit 40 or the second imaging unit 60 Whether there is a tablet T in the image.

In step S12, the control unit 103 judges that the state in which the sensor 30 detects the tablet T has been maintained for a certain period of time (Yes in step S12), and in step S13, when it is determined that there is no tablet T in the captured image (step S13). S13 (Yes)), although the sensor 30 detects it as a tablet T, because the tablet T does not exist on the captured image, it is judged that the object detected by the sensor 30 is attached and sensed. Foreign matter (such as powder or waste) on the lower surface of the light-transmitting member 71 corresponding to the detector 30, rather than the tablet T, in step S14, to blow the blowing part 81 corresponding to the sensor 30 from each blowing part 81 The blowing part 81 corresponding to the sensor 30 is controlled so that the flow of the blown gas changes from the first intensity to the second intensity. Thereafter, the process returns to step S12.

On the other hand, in step S12, when the control unit 103 judges that the sensor 30 detects that the state of the tablet T has not been maintained for a specific time or longer (No (No) in step S12), or, in step S13, when it is judged that the captured image When there is a tablet T inside (No (No) in step S13), in step S15, the flow of the gas blown out from each blowing part 81 is maintained at the first intensity, or, by blowing out the air from each blowing part 81 The gas blowing part 81 corresponding to the sensor 30 is controlled so that the flow of the gas blown out by the blowing part 81 of the sensor 31 returns from the second intensity to the first intensity. Thereafter, the process returns to step S12.

According to this processing example 2, although the state of the tablet T detected by the sensor 30 has been maintained for a certain period of time or longer, the tablet T does not exist in the captured image obtained by the first imaging unit 40 or the second imaging unit 60 In this case, the flow of the gas blown from the blowing part 81 corresponding to the sensor 30 is enhanced. Thereby, the foreign matter attached to the lower surface of the light-transmitting member 71 corresponding to the sensor 30, specifically, the lower surface of the light-transmitting member 71 exposed from the through-hole 70a shown in FIG. The sensor 30 is surely suppressed from falsely detecting the arrival of the tablet T.

(processing example 3) As shown in FIG. 8 , in processing example 3, in step S21 , the control unit 103 controls each blowing unit 81 so that the flow of the gas blown out from each blowing unit 81 is at the first intensity. Thereafter, in step S22, the control unit 103 judges whether a specific number of images (specific captured images) are seen in one or both of the captured images obtained by the first imaging unit 40 and the second imaging unit 60. Number of sheets) above the foreign body.

In step S22, when the control unit 103 judges that one or both of the captured images have seen more than a certain number of foreign objects (Yes (Yes) in step S22), in step S23, the specified The flow of gas blown by the blowing unit 81 corresponding to the imaging unit (either one or both of the first imaging unit 40 and the second imaging unit 60) of the captured images of more than one foreign object is changed from the first intensity to the second intensity. In this way, the corresponding blowing part 81 is controlled. Thereafter, the process returns to step S22.

On the other hand, in step S22, when the control unit 103 judges that foreign objects exceeding a certain number of sheets are not seen on one or both of the captured images (No (No) in step S22), in step S24, the The method of maintaining the flow of the gas blown out from each blowing part 81 at the first intensity, or the flow of the gas blown out from the blowing part 81 corresponding to the imaging part that acquires the captured image of a specific number or more of foreign objects. The way the flow returns from the second intensity to the first intensity controls the corresponding air blowing part 81 . Thereafter, the process returns to step S22.

According to this processing example 3, when one or both of the captured images obtained by the first imaging unit 40 and the second imaging unit 60 see a specific number of foreign objects, the self-obtained The flow of gas blown by the gas blowing unit 81 corresponding to the imaging unit (either one or both of the first imaging unit 40 and the second imaging unit 60 ) of the captured image of the foreign matter of a certain number or more is enhanced. That is, when more than a certain number of foreign matter is seen attached to the same position in the captured image, it is judged that the foreign matter is waste material attached to the cover portion 70 rather than waste material attached to the tablet T, and the foreign matter is blown from the corresponding air blowing portion. 81 The flow of the blown gas is enhanced. Thereby, since it will be attached to the lower surface of the light-transmitting member 71 facing the first imaging unit 40 or the lower surface of the light-transmitting member 72 facing the second imaging unit 60, specifically, from each through-hole 70b shown in FIG. , 70d to remove the foreign matter on the lower surface of each light-transmitting member 71, 72 exposed, so it can prevent the first imaging unit 40 or the second imaging unit 60 from photographing the foreign matter attached to the lower surface of the light-transmitting member 71, 72. False detection of lozenge T.

Here, the specific number is set as the number of a plurality of captured images obtained by capturing different tablets T by the same imaging unit. For example, in the case where a foreign object is seen at the same position (in the same range) in five captured images of a plurality of tablets T that are sequentially captured by the first imaging unit 40, it is judged that the foreign material present in the captured image is Foreign matter attached to the lower surface of the lid 70 rather than attached to the tablet T. When the same tablet is photographed by the first imaging unit 40 and the second imaging unit 60 , and foreign matter is seen at the same position of the two captured images, it is highly likely that the foreign matter is attached to the tablet T. On the other hand, in the photographed images of different tablets T, foreign matter is seen in a certain number or more, and it can be presumed that the foreign matter is attached to the cover portion 70 .

In addition, although it is judged whether or not more than a specific number of foreign objects are seen on the captured images, the time for obtaining the specific number of captured images, that is, the specific time may be used instead of the specific number. For example, when the intervals between the tablets T arranged in a row on the conveyor belt 21 are irregular and not specified, it is desirable to use a specific number. On the other hand, when the interval between the tablets T arranged in a row on the conveyor belt 21 is specified, a specified number of sheets or a specified time are used.

(processing example 4) As shown in FIG. 9 , processing example 4 is basically the same processing flow as processing example 3, but in processing example 4, instead of step S22 (see FIG. 8 ) in processing example 3, in step S32, the control unit 103 determines that the In one or both of the captured images obtained by the first imaging unit 40 and the second imaging unit 60, is it possible to see a specific area at a position where no tablet T exists (an area where no tablet T exists on the captured image)? Foreign objects with more than one sheet. The subsequent processing flow is the same as that of processing example 3.

According to this processing example 4, in one or both of the captured images respectively obtained by the first imaging unit 40 and the second imaging unit 60, a foreign object is seen at a position where the tablet T does not exist. Furthermore, The flow of the gas blown from the blowing unit 81 corresponding to the imaging unit (either one or both of the first imaging unit 40 and the second imaging unit 60) that acquires the captured image of the foreign object in a certain number or more is enhanced. . That is, when a specific number of sheets (at a specific time) or more of foreign matter adhered to a position where there is no tablet T is seen in the captured image, it is judged that the foreign matter is powder or waste adhering to the cover portion 70, and the first intensity is judged. The foreign matter cannot be removed under the air blowing, and the flow of the gas blown out from the corresponding air blowing part 81 is enhanced. Thereby, since it will be attached to the lower surface of the light-transmitting member 71 facing the first imaging unit 40 or the lower surface of the light-transmitting member 72 facing the second imaging unit 60, specifically, from each through-hole 70b shown in FIG. , 70d to remove the foreign matter on the lower surface of each light-transmitting member 71, 72 exposed, so it can prevent the first imaging unit 40 or the second imaging unit 60 from photographing the foreign matter attached to the lower surface of the light-transmitting member 71, 72. False detection of lozenge T.

(processing example 5) As shown in FIG. 10 , the processing flow of processing example 5 and processing example 3 is basically the same, but in processing example 5, instead of step S22 (refer to FIG. 8 ) of processing example 3, in step S42, the control unit 103 determines that the In both of the captured images obtained by the first imaging unit 40 and the second imaging unit 60 (two captured images), whether the presence or absence of a foreign object or the position of a foreign object is inconsistent. The subsequent processing flow is the same as that of the processing example 3, but in step S23, the control part 103 controls the flow of the gas blown out from each blowing part 81 corresponding to both of the first imaging part 40 and the second imaging part 60. The first intensity is set as the second intensity, and the corresponding air blowing parts 81 are controlled.

According to this processing example 5, when the presence or absence of a foreign object or the position of a foreign object is inconsistent with each of the captured images respectively obtained by the first imaging unit 40 and the second imaging unit 60, the image corresponding to the first imaging unit The flow of the gas blown out by each blowing part 81 of both the 40 and the second imaging part 60 is strengthened. That is, for the same tablet T, when the image captured by the first imaging unit 40 and the image captured by the second imaging unit 69 differ in the presence or absence or position of foreign matter, it is judged that the foreign matter is attached to the cover portion 70. The powder or waste material, rather than the powder or waste material attached to the tablet T, the flow of the gas blown from the respective blowing parts 81 is enhanced. Thereby, since it will be attached to the lower surface of the light-transmitting member 71 facing the first imaging unit 40 or the lower surface of the light-transmitting member 72 facing the second imaging unit 60, specifically, from each through-hole 70b shown in FIG. , 70d to remove the foreign matter on the lower surface of each light-transmitting member 71, 72 exposed, so it can prevent the first imaging unit 40 or the second imaging unit 60 from photographing the foreign matter attached to the lower surface of the light-transmitting member 71, 72. False detection of lozenge T.

(processing example 6) As shown in FIG. 11 , the processing flow of processing example 6 is basically the same as that of processing example 3, but in processing example 6, instead of step S22 (refer to FIG. 8 ) of processing example 3, in step S52, the control unit 103 determines whether the The ink head 51 is being maintained. The subsequent processing flow is the same as that of Processing Example 3, but in step S23, the control unit 103 controls the flow of the gas blown out from all the blowing units 81 from the first intensity to the second intensity, and controls all corresponding ones. blowing part 81 .

According to this processing example 6, when the inkjet head 51 is being maintained, the flows of the gases blown from all the blowing parts 81 are strengthened. In this way, during maintenance, the lower surfaces of the light-transmitting members 71 and 72 attached to the sensor 30 and opposite to the first imaging unit 40 and the second imaging unit 60, in detail, from the one shown in FIG. 3 The foreign matter on the lower surface of each light-transmitting member 71, 72 exposed by each through-hole 70a, 70b, 70d is removed, so it can prevent the sensor 30 from detecting the foreign matter attached to the lower surface of the light-transmitting member 71 and falsely detecting the tablet T. In addition, it is possible to prevent false detection of tablets T caused by imaging units such as the first imaging unit 40 and the second imaging unit 60 imaging foreign objects adhering to the lower surfaces of the light-transmitting members 71 and 72 .

In addition, whether the inkjet head 51 is being maintained can be judged as being under maintenance when, for example, the detection of the tablet T by the sensor 30 , the first imaging unit 40 , and the second imaging unit 60 has not been completed for a specified period of time. Alternatively, the control device 100 may also detect that the operator selects the "maintenance mode", and determine that the maintenance is in progress.

Usually, there is no tablet T on the conveyor belt 21 during maintenance, and the posture of the tablet T is not changed by the flow of gas blown from each blowing part 81, so strong air flow can also be generated. Also, when maintaining the inkjet head 51, the suction of the liquid droplets is sometimes carried out by the suction part provided in the maintenance part, so sometimes the flow of air is generated, and the powder or waste materials adhering to the inkjet head 51 are flying and adhered to the inkjet head 51. In the cover part 70 , by strengthening the flow of the gas blown from each blowing part 81 , it is possible to suppress flying powder or waste from adhering to the lower surface of the cover part 70 . Also, even if flying powder, waste, etc. adhere to the lower surface of the cover portion 70, the powder, waste, etc. can be removed.

As described above, according to the first embodiment, the tablet printing apparatus 1 includes a detection unit (such as the sensor 30, the first imaging unit 40, or the second imaging unit 60) that detects the tablet T conveyed by the conveyor belt 21. Inkjet head 51, which prints the tablet T detected by the detection part; cover part 70, which covers the detection part; air blowing part 81, its surface on the conveyor belt 21 side of cover part 70, when viewed from above Gas is blown in a direction horizontally intersecting with the conveying direction H1 of the tablet T; and the control unit 103 controls the blowing unit 81 . Thereby, the gas blowing part 81 blows the gas onto the lower surface of the cover part 70, and the foreign matter (such as powder or waste) adhering to the lower surface of the cover part 70 is removed. The foreign matter on the lower surface of the part 70 may cause false detection of the tablet T. Therefore, it is possible to suppress erroneous detection due to adhesion of foreign matter, and to efficiently print on the tablet T.

＜Second Embodiment＞ A second embodiment will be described with reference to FIG. 12 .

In the second embodiment, as shown in FIG. 12 , the tablets T are conveyed in two rows. In this case, the supply unit 10 supplies the tablets T to the conveyor belt 21 in two rows. In the example of Fig. 12, the tablets T are conveyed in two rows, but the present invention is not limited thereto. When the tablets T are conveyed in two rows, the sensor 30, the first imaging unit 40, and the second imaging unit 60 are installed in each row. In addition, although the inkjet head 51 is provided so that each row may be common, it is not limited to this, You may arrange for each row.

The air blowing unit 81 is provided for each of the plurality of sensors 30 , the plurality of first imaging units 40 , and the plurality of second imaging units 60 . In the example of FIG. 12, six air blowing parts 81 are provided, and are arranged in two rows in the conveyance direction H1. The gas blowing part 81 of each row avoids the inner side of each row, and blows gas outward. In detail, each air blowing part 81 is provided in the lower surface of the cover part 70 so that several suction holes 21a may be located between the rows arranged in two rows in planar view. The gas blowing parts 81 blow out gas in opposite directions to the outside of the space between the cover part 70 and the conveyor belt 21 along the lower surface of the cover part 70 .

In addition, in the case of conveying in a plurality of lines of three or more, each air blowing part 81 blows air to the outside respectively. At this time, the air blowing unit 81 corresponding to the inner conveying row blows air to the tablet T located on the outer conveying row. The risk that the air blown from the air blowing part 81 affects the posture of the tablet T is minimized.

According to this configuration, the blowing direction of the gas is a direction horizontally intersecting with the conveying direction H1 in plan view, that is, a direction not toward the adjacent conveying row, that is, a direction toward the outside of the adjacent conveying row. Thereby, the tablet T is exposed to the air flow at least only when it passes under the air blowing part 81, and the influence of the air flow of the blown gas on the posture of the tablet T is suppressed, so that the tablet T can be printed efficiently. Moreover, since the influence of the gas blown from the air blowing part 81 on the printing of the inkjet head 51 is suppressed, printing on the tablet T can be performed efficiently.

In addition, although the respective gas blowing directions of the air blowing parts 81 arranged in the conveyance direction H1 are the same, it is not limited thereto and may be different. Also, since the blowing direction of each gas blowing portion 81 is a direction horizontally intersecting with the conveying direction H1 in a plan view, it may be a direction inclined toward the upstream side of the conveying direction H in a plan view, or may be directed toward the conveying direction H in a plan view. The downstream side is inclined in a direction, but in order to suppress blowing of the gas to the inkjet head 51 side, it is preferably inclined in a direction opposite to the inkjet head 51 side. For example, the gas blowing direction of each gas blowing unit 81 corresponding to the sensor 30 and the first imaging unit 40 is expected to be a direction inclined toward the upstream side of the conveying direction H1 in plan view, and the gas blowing direction corresponding to the second imaging unit 60 The gas blowing direction of the gas part 81 is desirably a direction inclined toward the downstream side of the conveyance direction H1 in planar view.

As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained. Also, when the tablets T are conveyed in multiple lines, the influence of the air flow of the blown gas on the posture of the tablets T or the printing of the inkjet head 51 is suppressed, so that the tablets T can be printed efficiently.

＜Other Embodiments＞ In the above description, the tablet T is printed using the tablet printing device 1 (tablet printing method) of one embodiment, which can also be referred to as using the tablet printing device 1 (tablet printing method) of one embodiment ) to print the tablet T to manufacture the printed tablet T. That is, the tablet printing device 1 may be referred to as a tablet manufacturing device, and the tablet printing method may be referred to as a tablet manufacturing method.

Also, in the above description, it has been exemplified that the tablet T is conveyed in one or two rows, but it is not limited, and the number of rows may be three or five or more, and it is not particularly limited. It may be two or more, and it is not particularly limited. Moreover, the number of objects of the inkjet head 51 may be two or more, and it is not specifically limited.

In addition, in the above description, as the inkjet head 51, a printing head in which the nozzles 51a are arranged in one line has been exemplified, but it is not limited thereto. For example, a printing head in which the nozzles 51a are arranged in a plurality of lines may be used. In addition, a plurality of inkjet heads 51 may be used in a line in a direction perpendicular to the conveyance direction H1 in a horizontal plane.

Also, in the above description, the inkjet head 51 has been exemplified so that the direction in which the nozzles 51a are arranged becomes a direction perpendicular to the conveyance direction H1 in the horizontal plane, but this is not limiting. Set in the direction intersecting with the conveying direction H1.

Also, in the above description, one side of the printed tablet T has been exemplified, but it is not limiting. For example, the conveying part 20, the sensor 30, the first imaging part 40, the printing part 50 and the second imaging part 60 As a unit, and the unit is stacked up and down, the tablet T printed on the upper conveying part 20 is reversed, delivered to the lower conveying part 20, and both sides of the tablet T are printed.

In addition, in the above description, the tablets T are supplied at random on the conveyor belt 21 rather than at specific intervals, but this is not limiting, and may be supplied at specific intervals. In addition, in the above description, the tablet T is sucked and held by the suction hole 21a formed on the conveyor belt 21, but it is not limited thereto, and it may be stored and held in a bag or the like and conveyed, or may be held on the conveyor belt by its own weight. 21 on and move.

Here, as said tablet T, the tablet used for medicine, diet, cleaning, an industrial use, or fragrance can be included. In addition, as the tablet T, there are naked tablets (vegetarian tablets), sugar-coated tablets, film-coated tablets, enteric-coated tablets, gelatin-coated tablets, multi-layer tablets, cored tablets, etc., and various capsule tablets such as hard capsules or soft capsules may also be contained in the tablets T. Lozenge T. In addition, as the shape of the tablet T, there exist various shapes, such as a disc shape, a lens shape, a triangle shape, and an ellipse shape. Also, when the tablet T to be printed is for medicine or food, the ink used is preferably an edible ink. As the edible ink, any one of synthetic pigment ink, natural pigment ink, dye ink, and pigment ink may be used.

Some embodiments of the present invention have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments or variations thereof are included in the scope or gist of the invention, and are included in the inventions described in the claims and their equivalents.

1: Tablet printing device 10: Supply Department 11: Hopper 12: Exit machine 20:Transportation Department 21: conveyor belt 21a: Attraction hole 22: Drive pulley 23: driven pulley 24: motor 25: Position detector 26: Attraction chamber 30: Sensor 40: The first camera department 50: Printing department 51: inkjet head 51a: Nozzle 60: The second camera department 70: Cover 70a: through hole 70b: through hole 70c: through hole 70d: through hole 71: Light-transmitting member 72: Light-transmitting member 73: Airtight components 80: blowing device 81: blowing part 90: Recycling Department 100: Control device 100a: input device 100b: output device 101: Image Processing Department 102: memory department 103: Control Department H1: Transport direction S1～S4: steps S11～S15: Steps S21～S24: Steps S32: step S42: step S52: step T: lozenge X: direction Y: Direction θ: direction

Fig. 1 is a first diagram showing an example of a schematic configuration of a tablet printing device according to a first embodiment. Fig. 2 is a second diagram showing an example of a schematic configuration of the tablet printing device of the first embodiment. Fig. 3 is a first diagram showing an example of a schematic configuration of a lid and an air blowing device according to the first embodiment. Fig. 4 is a second diagram showing an example of the schematic configuration of the cover and the air blowing device of the first embodiment. Fig. 5 is a diagram showing an example of a schematic configuration of a control device according to the first embodiment. Fig. 6 is a flow chart showing the flow of processing example 1 of the first embodiment. Fig. 7 is a flow chart showing the flow of processing example 2 of the first embodiment. Fig. 8 is a flow chart showing the flow of processing example 3 of the first embodiment. Fig. 9 is a flow chart showing the flow of processing example 4 of the first embodiment. Fig. 10 is a flow chart showing the flow of processing example 5 of the first embodiment. Fig. 11 is a flow chart showing the flow of processing example 6 of the first embodiment. Fig. 12 is a diagram showing an example of a schematic configuration of an air blowing device according to a second embodiment.

1: Tablet printing device

10: Supply Department

11: Hopper

12: Exit machine

20:Transportation Department

21: conveyor belt

22: Drive pulley

23: driven pulley

24: motor

25: Position detector

26: Attraction chamber

30: Sensor

40: The first camera department

50: Printing Department

51: inkjet head

60: The second camera department

70: Cover

80: blowing device

81: blowing part

90: Recycling Department

100: Control device

H1: Transport direction

T: lozenge

Claims (10)

A tablet printing device comprising: The detection part, which detects the tablets conveyed by the conveyor belt; an inkjet head for printing the tablet detected by the detection unit; a cover portion covering the detection portion; an air blowing unit for blowing gas to the surface of the cover on the conveyor belt side in a direction horizontally intersecting the conveying direction of the tablet in a plan view; and A control unit controls the air blowing unit. Such as the tablet printing device of claim 1, wherein When the above-mentioned detection unit is used to convey the above-mentioned tablets in multiple rows by the above-mentioned conveyor belt, it is installed in rows; The cover part covers a plurality of the detection parts; The above-mentioned blowing part is provided for each of the above-mentioned detection parts; The gas blowing part of each of the detection parts respectively avoids the inside of the plurality of rows and blows the gas to the outside. Such as the tablet printing device of claim 1, wherein The control unit controls the gas blowing unit to increase the flow of the gas when it is determined that the state of the tablet detected by the detection unit has been maintained for a predetermined time or longer. Such as the tablet printing device of claim 1, wherein There are plural detection units; The cover part covers a plurality of the detection parts; The first detection unit among the plurality of detection units detects the arrival of the tablet conveyed by the conveyor belt; The second detection unit among the plurality of detection units photographs the tablet conveyed by the conveyor belt; When the control unit judges that the state of the tablet detected by the first detection unit has been maintained for a certain period of time or more, and determines that the tablet does not exist in the image obtained by the second detection unit, the control unit uses the flow of the gas to In an enhanced manner, the above-mentioned blowing part is controlled. Such as the tablet printing device of claim 1, wherein The detection unit photographs the tablet conveyed by the conveyor belt; The control unit controls the blower in such a way that the flow of the gas is strengthened when it is determined that the foreign matter appears on the same position of the image obtained by the detection unit for a specific number of images or for a specific time. gas department. Such as the tablet printing device of claim 1, wherein The detection unit photographs the tablet conveyed by the conveyor belt; The control unit controls the blowing unit to increase the flow of the gas when it is determined that a foreign object is present at a position where the tablet does not exist in the image obtained by the detection unit. Such as the tablet printing device of claim 1, wherein There are plural detection units; The cover part covers a plurality of the detection parts; The first detection unit among the plurality of detection units is installed on the upstream side of the inkjet head in the conveying direction of the tablet, and photographs the tablet conveyed by the conveyor belt; The second detection unit among the plurality of detection units is installed on the downstream side of the inkjet head in the conveying direction of the tablet, and photographs the tablet conveyed by the conveyor belt; When the control unit judges that the first image obtained by the first detection unit is inconsistent with the second image obtained by the second detection unit, the presence or absence of foreign matter or the position of the foreign matter is inconsistent, and the above-mentioned gas The above-mentioned blowing part is controlled in a way of enhancing the flow. Such as the tablet printing device of claim 1, wherein The control unit controls the air blowing unit to increase the flow of the gas when it is determined that the inkjet head is being maintained. The tablet printing device according to any one of claims 3 to 8, wherein After the control unit controls the blowing unit in such a way that the flow of the gas is increased, when it is judged that the state of the tablet detected by the detection unit has not been maintained for a certain period of time, the flow of the gas is returned to the intensity before the increase In this way, the above-mentioned blowing part is controlled. A tablet printing method, comprising the steps of: The detection part detects the tablets conveyed by the conveyor belt; The inkjet head prints the tablet detected by the detection unit; The air blowing unit blows gas to the surface of the cover portion covering the detection unit on the side of the conveyor belt in a direction horizontally intersecting with the conveying direction of the tablet in plan view; and The control unit controls the air blowing unit.