JP2017060886A - Tablet printing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tablet printing method which can perform printing processing to the rear surface of a tablet with a secant line engraved.SOLUTION: One surface of a plurality of tablets 2 conveyed by a conveyance drum 10 is imaged by a first secant line camera 51. When the tablets 2 are delivered from the conveyance drum 10 to a first conveyor belt 20, all the tablets 2 are reversed while maintaining directivity. The other surface of the plurality of tablets 2 conveyed by the first conveyor belt 20 is imaged by a second secant line camera 52. On the basis of the image data of the front and rear surfaces of the plurality of tablets 2 acquired by the first secant line camera 51 and the second secant line camera 52, a first ink jet head 61 performs front surface printing processing along a prescribed direction with respect to the secant line of the front surface to the front surface of the tablets 2, and a second ink jet head 62 performs rear surface printing processing along the same direction of the prescribed direction of the rear surface to the rear surface of the tablets 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tablet printing method for performing a printing process on a tablet in which a secant for identifying a direction is engraved on a surface.

  Conventionally, codes for identifying medicines are often printed on pharmaceutical tablets. Typically, the identification code printed on the tablet is, for example, a company code representing a manufacturer or a product code for distinguishing products. Such an identification code is mainly used for dispensing in medical institutions and pharmacies. In order to prevent accidental ingestion of tablets (for example, prevention of accidental ingestion of an antihypertensive agent and a pressor agent), an indication that can be clearly recognized by a patient may be attached to the tablet. In addition, there is a demand for numbering tablets for the purpose of pharmaceutical traceability.

  Such an identification code or the like may be imprinted on the surface of the tablet, but since there is a problem in visibility, there is an increasing need for printing directly on the tablet by printing. Patent Documents 1 and 2 propose a printing technique for tablets using an ink jet printer.

  In Patent Document 1, a plurality of randomly supplied workpieces (tablets) are imaged to detect information such as the position and orientation of each workpiece, and a print pattern for each workpiece is created based on the workpiece information. It is disclosed. Patent Document 2 discloses that a plurality of randomly supplied tablets are picked up by a line sensor camera, and print data corresponding to the direction of the score line of the tablets is created based on the image data.

JP 2011-20325 A JP 2013-121432 A

  In the tablet printing technology disclosed in Patent Literatures 1 and 2, printing is performed only on one side of the tablet (for example, the side on which the secant line is formed in Patent Literature 2). The printing process is also expected. When printing is performed on both the front and back sides of the tablet, it is desirable to perform printing in the same direction on the front and back surfaces from the viewpoint of preventing counterfeiting of the drug.

  Further, in many cases, a tablet (particularly, an uncoated tablet) is engraved with a dividing line for splitting in half. Patent Document 2 discloses that printing is performed in accordance with the direction of the dividing line. However, when printing is performed in different directions on the front surface and the back surface of the tablet, the tablet is divided in half by the dividing line. Sometimes the printed information on the back side is divided and the value of information is lost.

  This invention is made | formed in view of the said subject, and it aims at providing the tablet printing method which can perform a printing process also with respect to the back surface of the tablet in which the secant was engraved.

  In order to solve the above-mentioned problem, the invention of claim 1 is a tablet printing method for performing printing processing on a tablet whose surface is engraved with a score line. Based on the imaging process, the second imaging process for imaging the other side of the plurality of tablets, and the image data acquired in the first imaging process and the second imaging process, the back surfaces of the plurality of tablets And a back surface printing step of performing a printing process along a predetermined direction with respect to the dividing line.

  The invention according to claim 2 is the tablet printing method according to claim 1, wherein the printing process is performed on the surfaces of the plurality of tablets along the same direction as the predetermined direction based on the image data. It further comprises a surface printing step.

  According to a third aspect of the present invention, in the tablet printing method according to the first or second aspect of the present invention, the predetermined direction is a direction parallel to the secant line.

  According to the first to third aspects of the present invention, printing is performed along a predetermined direction with respect to the secant line on the back surface of the plurality of tablets based on the image data obtained by imaging one side and the other side of the plurality of tablets. Since the process is performed, the printing process can be performed also on the back surface of the tablet on which the score line is engraved.

It is a figure which shows the whole schematic structure of the tablet printing apparatus which concerns on this invention. It is a perspective view which shows the external appearance of a conveyance drum and a 1st conveyance belt. It is a flowchart which shows the procedure of the processing operation in the tablet printer of FIG. It is a flowchart which shows the procedure of the processing operation in the tablet printer of FIG. It is a top view of a tablet. It is a figure which shows an example of the imaging result by a 1st secant camera. It is a figure which shows an example of the imaging result by a 2nd secant camera. It is a figure which shows an example of the printing process result by a 1st inkjet head. It is a figure which shows an example of the imaging result by a 3rd secant camera. It is a figure which shows an example of the printing process result by a 2nd inkjet head.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an overall schematic configuration of a tablet printing apparatus 1 according to the present invention. The tablet printer 1 is a device that performs a printing process on both the front and back sides of a tablet. 1 and 2 are appropriately attached with an XYZ orthogonal coordinate system in which the Z-axis direction is the vertical direction and the XY plane is the horizontal plane in order to clarify the directional relationship. Further, in FIG. 1 and the subsequent drawings, the dimensions and numbers of the respective parts are exaggerated or simplified as necessary for easy understanding.

  The tablet printing apparatus 1 includes, as main elements, a hopper 8, a transport drum 10, a first transport belt 20, a second transport belt 30, a third transport belt 40, a first secant camera 51, a second secant camera 52, and a third secant. A camera 53, a first inkjet head 61, and a second inkjet head 62 are provided. Moreover, the tablet printing apparatus 1 is provided with the control part 3 which controls each drive part provided in the apparatus and advances the printing process with respect to a tablet.

  The hopper 8 is provided on the upper side of the ceiling portion of the housing 5 of the tablet printing apparatus 1. The hopper 8 is an input unit for supplying a large number of tablets into the apparatus at once. The plurality of tablets charged from the hopper 8 are guided to the transport drum 10 by the slider 9. The other elements except the hopper 8 are provided inside the housing 5 of the tablet printing apparatus 1.

  FIG. 2 is a perspective view showing the appearance of the transport drum 10 and the first transport belt 20. The transport drum (first transport unit) 10 has a substantially cylindrical shape, and is rotated clockwise on the paper surface of FIG. 1 by a rotation drive motor (not shown) about the central axis along the Y-axis direction. The As shown in FIG. 2, a plurality of suction holes 11 are formed on the outer peripheral surface of the transport drum 10. In the present embodiment, the suction holes 11 are formed in five rows at equal intervals along the central axis of the transport drum 10. Further, a set of suction holes 11 in five rows is provided in a plurality of rows at equal intervals along the circumferential direction of the outer peripheral surface of the transport drum 10.

  The shape of the suction hole 11 is in accordance with the shape of the tablet to be printed. For example, in this embodiment, since the disk-shaped tablet is processed, the shape of the suction hole 11 is also circular. The size of the suction hole 11 is slightly larger than the size of the tablet. For example, if the diameter of the disc-shaped tablet is about 10 mm, the diameter of the suction hole 11 is about 12 mm.

  Small holes smaller than the suction holes 11 are provided at the bottoms of the plurality of suction holes 11, and each of the plurality of suction holes 11 is provided with a suction mechanism (illustrated) provided inside the transport drum 10 through the small holes. (Omitted). By operating the suction mechanism, a negative pressure lower than the atmospheric pressure can be applied to each of the plurality of suction holes 11. Thereby, each adsorption hole 11 of the conveyance drum 10 can adsorb and hold one tablet.

  In addition, a blow mechanism is provided inside the transport drum 10 in the vicinity of a portion facing the first transport belt 20. The blow mechanism blows pressurized air toward the small hole provided at the bottom of the suction hole 11. When the blow mechanism blows air, a pressure higher than the atmospheric pressure can be applied to the suction hole 11. Thereby, the adsorption state of the tablet by the adsorption hole 11 can be cancelled | released. As described above, the suction holes 11 arranged in five rows and one row facing the first transport belt 20 while applying a suction force to the entire plurality of suction holes 11 provided in the transport drum 10 by the suction mechanism. Can be released by the blow mechanism.

  The first transport belt (second transport unit) 20 is configured by spanning a plurality of holding plates 22 connected in a belt shape over a pair of pulleys. When the pair of pulleys are rotationally driven by a drive motor (not shown), the belt-like body composed of the plurality of holding plates 22 rotates in the direction indicated by the arrow in FIG. The first conveyor belt 20 is installed such that a part of a belt-like body composed of a plurality of holding plates 22 is opposed to the outer peripheral surface of the conveyor drum 10.

  As shown in FIG. 2, a plurality of suction holes 21 are formed in each of the plurality of holding plates 22 at equal intervals along the belt width direction (Y-axis direction). In this embodiment, suction holes 21 are formed in each holding plate 22 in five rows along the Y-axis direction. The shape and size of the suction holes 21 themselves of the first transport belt 20 are the same as the suction holes 11 of the transport drum 10. The intervals between the suction holes 21 arranged in five rows on each holding plate 22 are also equal to the intervals between the suction holes 11 arranged in five rows along the central axis of the transport drum 10.

  Similar to the suction holes 11, small holes smaller than the suction holes 21 are provided at the bottoms of the plurality of suction holes 21, and each of the plurality of suction holes 21 passes through the small holes and the first transport belt 20. Is communicated with a suction mechanism provided in the interior. By operating the suction mechanism, a negative pressure lower than the atmospheric pressure can be applied to each of the plurality of suction holes 21. Thereby, each adsorption hole 21 of the 1st conveyance belt 20 can adsorb and hold one tablet.

  In addition, a blow mechanism is provided inside the first transport belt 20 in the vicinity of a portion facing a second transport belt 30 described later. The blow mechanism blows pressurized air toward the small hole provided at the bottom of the suction hole 21. When the blow mechanism blows air, a pressure higher than the atmospheric pressure can be applied to the suction hole 21. Thereby, the adsorption state of the tablet by the adsorption hole 21 can be cancelled | released.

  Next, the configurations of the second transport belt (third transport unit) 30 and the third transport belt (fourth transport unit) 40 are substantially the same as those of the first transport belt 20. That is, both the second conveyance belt 30 and the third conveyance belt 40 are configured by a plurality of holding plates joined together in a belt shape and stretched around a pair of pulleys. When the pair of pulleys are rotationally driven by a drive motor (not shown), the second conveyor belt 30 and the third conveyor belt 40 each rotate in the directions indicated by the arrows in FIG. The second conveyor belt 30 is installed such that a part of a belt-like body composed of a plurality of holding plates faces the first conveyor belt 20 in the vicinity. Similarly, the third conveyor belt 40 is installed such that a part of a belt-like body composed of a plurality of holding plates faces the second conveyor belt 30 in the vicinity.

  A plurality of (five rows in this embodiment) suction holes are formed at equal intervals along the belt width direction (Y-axis direction) in the holding plates of the second transport belt 30 and the third transport belt 40. Similarly to the above, a negative pressure lower than the atmospheric pressure can be applied to the suction holes of the second transport belt 30 by a suction mechanism provided inside the second transport belt 30. Thereby, each adsorption hole of the 2nd conveyance belt 30 can adsorb and hold one tablet. In addition, a blow mechanism is provided in the vicinity of the portion facing the third conveyor belt 40 inside the second conveyor belt 30. When the blow mechanism blows air, a pressure higher than the atmospheric pressure is applied to the suction holes of the second transport belt 30 to release the tablet adsorption state by the suction holes.

  Similarly, a negative pressure lower than the atmospheric pressure can be applied to the suction holes of the third transport belt 40 by a suction mechanism provided inside the third transport belt 40. Thereby, each adsorption hole of the 3rd conveyance belt 40 can adsorb and hold one tablet. In addition, blow mechanisms are provided at three locations inside the third conveyance belt 40. When the blow mechanism blows air, a pressure higher than the atmospheric pressure is applied to the suction hole of the third transport belt 40 to release the tablet adsorption state by the suction hole.

  The three blow mechanisms of the third transport belt 40 all blow air downward or obliquely downward. Therefore, among the three blow mechanisms, a blow mechanism provided at a portion facing the non-defective duct 48 blows air, thereby releasing the tablet adsorption state by the suction holes and releasing the tablets to the non-defective duct 48. be able to. The tablets released into the good product duct 48 are collected in the good product collection box 58. In addition, when a blow mechanism provided at a portion facing the uninspected duct 47 blows air, the tablet is released from the suction state by the suction holes, and the tablet can be discharged into the uninspected duct 47. The tablets released into the uninspected duct 47 are collected in the uninspected box 57. Furthermore, when the blow mechanism provided at a portion facing the defective product duct 46 blows air, the tablet can be released from the suction state by the suction holes and can be discharged into the defective product duct 46. The tablets released into the defective product duct 46 are collected in the defective product box 56.

  Next, the first secant camera (first imaging unit) 51, the second secant camera (second imaging unit) 52, and the third secant camera (third imaging unit) 53 all capture images for imaging a predetermined area. For example, a CCD camera. The first secant camera 51 is installed facing the outer peripheral surface so that the imaging area becomes the outer peripheral surface of the transport drum 10. Further, the first secant camera 51 is provided at a position where the downstream side along the transport direction of the transport drum 10 can be imaged from the slider 9. The first secant camera 51 images a plurality of tablets that are sucked and held in the suction holes 11 of the transport drum 10. The size of the imaging area of the first secant camera 51 can be set as appropriate, but since the cylindrical peripheral surface of the transport drum 10 is imaged, focusing is performed over a wide range of the cylindrical peripheral surface. It is difficult. For this reason, the imaging area of the 1st secant camera 51 should just be the magnitude | size which can image the tablet of 5 rows 1 line facing the 1st secant camera 51 at least.

  The second secant camera 52 is installed facing the transport surface so that the imaging area becomes the transport surface of the first transport belt 20. The second secant camera 52 is provided at a position downstream of the position facing the transport drum 10 along the transport direction of the first transport belt 20 and at a position where the upstream side of the first inkjet head 61 can be imaged. It has been. The second secant camera 52 images a plurality of tablets that are sucked and held by the first transport belt 20 and transported. The size of the imaging area of the second secant camera 52 can be set appropriately, and may be any size as long as it can capture at least 5 columns and 1 row of tablets facing the second secant camera 52. . Unlike the transport drum 10, the transport surface of the first transport belt 20 is a substantially flat surface, so that even if the imaging area of the second secant camera 52 is wide, it is relatively easy to focus on the entire surface.

  The third secant camera 53 is installed facing the conveyance surface so that the imaging area becomes the conveyance surface of the second conveyance belt 30. The third secant camera 53 is a position downstream of the position facing the first conveyor belt 20 along the conveyance direction of the second conveyor belt 30 and a position where the upstream side of the second inkjet head 62 can be imaged. Is provided. The third secant camera 53 images a plurality of tablets that are sucked and held by the second transport belt 30 and transported. The size of the imaging area of the third secant camera 53 can be set appropriately, and may be any size as long as it can capture at least 5 columns and 1 row of tablets facing the third secant camera 53. . Similarly to the second secant camera 52, the transport surface of the second conveyor belt 30 is substantially flat, so that it is relatively easy to focus on the entire surface even if the imaging area of the third secant camera 53 is large. .

  The first inkjet head 61 and the second inkjet head 62 include a plurality of ejection nozzles, and eject ink droplets from these ejection nozzles by an inkjet method. The inkjet method may be a piezo method in which a voltage is applied to a piezo element (piezoelectric element) to deform and eject ink droplets, or ink droplets are generated by energizing a heater to heat the ink. It may be a thermal method that discharges water. In the present embodiment, in order to perform a printing process on a pharmaceutical tablet, the edible ink produced from the raw materials recognized by the Food Sanitation Law is used as the ink ejected from the first inkjet head 61 and the second inkjet head 62. use. The first ink jet head 61 and the second ink jet head 62 can eject inks of four colors of cyan (C), magenta (M), yellow (Y), and black (K), and mix them. Color printing is possible.

  The first inkjet head 61 is provided on the downstream side of the second secant camera 52 along the conveyance direction of the first conveyance belt 20. The first inkjet head 61 performs a printing process on a plurality of tablets that are sucked and held by the first transport belt 20 and transported. The second inkjet head 62 is provided on the downstream side of the third secant camera 53 along the conveyance direction of the second conveyance belt 30. The second inkjet head 62 performs a printing process on a plurality of tablets that are sucked and held by the second transport belt 30 and transported. The first inkjet head 61 and the second inkjet head 62 are preferably full-line heads that cover the entire width direction of the first conveyor belt 20 and the second conveyor belt 30, respectively.

  In addition, the tablet printing apparatus 1 includes a first inspection camera 71 and a second inspection camera 72. As the 1st inspection camera 71 and the 2nd inspection camera 72, a CCD camera can be used like the secant camera mentioned above, for example. The first inspection camera 71 is installed facing the conveyance surface so that the imaging area becomes the conveyance surface of the second conveyance belt 30. The first inspection camera 71 is provided at a position where the downstream side of the second inkjet head 62 can be imaged along the conveyance direction of the second conveyance belt 30. The first inspection camera 71 images a plurality of tablets that are sucked and held by the second transport belt 30 and transported. As shown in FIG. 1, the first inspection camera 71 is provided below the second transport belt 30, but the second transport belt 30 sucks and holds the tablets and transports them, so that the tablets are on the lower side. Even if the tablet is facing (the suction hole is opened downward), the tablet is transported without dropping.

  The second inspection camera 72 is installed to face the conveyance surface so that the imaging area becomes the conveyance surface of the third conveyance belt 40. The second inspection camera 72 images a plurality of tablets that are sucked and held by the third transport belt 40 and transported.

  Further, the tablet printing apparatus 1 includes a first heater 76 and a second heater 77. As the first heater 76 and the second heater 77, for example, a hot-air drying heater that blows hot air to heat and dry the tablet can be used. The first heater 76 is provided on the downstream side of the first inkjet head 61 along the conveyance direction of the first conveyance belt 20. The first heater 76 blows hot air on the tablets on which the printing process has been performed by the first inkjet head 61 to dry them.

  The second heater 77 is provided on the downstream side of the second inkjet head 62 along the conveyance direction of the second conveyance belt 30. The second heater 77 blows hot air on the tablets that have been printed by the second inkjet head 62 and dries them. The first heater 76 and the second heater 77 are provided below the first conveyor belt 20 and the second conveyor belt 30, respectively, but the first conveyor belt 20 and the second conveyor belt 30 are the same as described above. Since the tablet is transported while adsorbing and holding the tablet, the tablet is transported without falling even when the tablet faces downward.

  Furthermore, the tablet printing apparatus 1 includes four cleaning mechanisms 81, 82, 83, and 84. The powder generated from the tablet may adhere to the transport drum 10, the first transport belt 20, the second transport belt 30, and the third transport belt 40. The cleaning mechanisms 81, 82, 83, 84 clean the powder adhering to the transport drum 10, the first transport belt 20, the second transport belt 30, and the third transport belt 40, respectively. As the cleaning mechanisms 81, 82, 83, and 84, for example, a mechanism that sucks and collects the ambient atmosphere by blowing air can be employed.

  The control unit 3 controls the various operation mechanisms provided in the tablet printing apparatus 1. The configuration of the control unit 3 as hardware is the same as that of a general computer. That is, the control unit 3 stores a CPU that performs various arithmetic processes, a ROM that is a read-only memory that stores basic programs, a RAM that is a readable and writable memory that stores various information, control software, data, and the like. It is configured with a magnetic disk. When the CPU of the control unit 3 executes a predetermined processing program, processing for the tablet in the tablet printing apparatus 1 proceeds. The control unit 3 also has a function as a print control unit that controls the first inkjet head 61 and the second inkjet head 62 based on image data acquired by the first secant camera 51, the second secant camera 52, and the like. doing.

  Next, the processing operation in the tablet printing apparatus 1 having the above configuration will be described. 3 and 4 are flowcharts showing the procedure of the processing operation in the tablet printing apparatus 1. First, a plurality of tablets are collectively put into the hopper 8 of the tablet printing apparatus 1 (step S1). The batch loading of tablets may be performed manually by an operator using a bucket or the like, or may be automatically performed by a transport mechanism separate from the tablet printing apparatus 1. However, the plurality of tablets to be charged all are of the same type.

  In the present embodiment, a plurality of disc-shaped tablets 2 are put into the hopper 8. FIG. 5 is a plan view of the tablet 2. On one side of the tablet 2, a score line 7 for dividing the tablet 2 in half is engraved. The secant 7 is a groove carved along the radial direction of the disc-shaped tablet 2. The secant 7 is engraved only on one side of the tablet 2.

  In this embodiment, the surface on the side where the secant 7 is provided is the surface of the tablet 2. The secant 7 is not engraved on the back surface of the tablet 2. In addition, there is no difference in the properties as a medicine between the front surface and the back surface of the tablet 2, and the surface on the side where the secant line 7 is provided is merely used as the front surface for convenience of distinction.

  The plurality of tablets 2 put into the hopper 8 are guided to the transport drum 10 by the slider 9, and the plurality of tablets 2 are sucked and held in the suction holes 11 of the transport drum 10 one by one. In the transport drum 10, suction holes 11 are formed in five rows along the direction perpendicular to the transport direction (the circumferential direction of the transport drum 10), that is, along the central axis direction of the transport drum 10. Accordingly, the transport drum 10 transports the plurality of tablets 2 in five rows in which five tablets are aligned in a direction perpendicular to the transport direction. In this specification, a unit in which five tablets are arranged in a direction perpendicular to the conveyance direction of the conveyance drum 10 is referred to as “row”. That is, the transport drum 10 sucks and holds the tablets 2 individually in the suction holes 11 and transports the plurality of tablets 2 in a state in which the tablets 2 are arranged in a plurality of rows and columns (step S2). The hopper 8 is provided with an alignment mechanism for aligning and feeding the plurality of tablets 2 by five so that the transport drum 10 can smoothly adsorb and hold the tablets 2 fed from the hopper 8 by five. May be. As such an alignment mechanism, for example, a ball folder type mechanism can be adopted.

  Next, the 1st secant camera 51 images the some tablet 2 currently conveyed by the conveyance drum 10 (step S3). The plurality of tablets 2 are held in the suction holes 11 of the transport drum 10 and are transported clockwise along the circumferential direction of the transport drum 10 on the paper surface of FIG. Although the plurality of tablets 2 are conveyed in an array of 5 rows, it is completely random whether the surface of each tablet 2 faces the inside of the conveyance drum 10 (the center side of the conveyance drum 10) or the outside. . Further, since the circular tablet 2 is held by the circular suction hole 11, the directionality of the tablet 2 is arbitrary, and the direction of the dividing line 7 of each tablet 2 conveyed by the conveyance drum 10 is completely random. The first secant camera 51 images the tablet 2 from the outside of the transport drum 10. Therefore, the plurality of tablets 2 imaged by the first secant camera 51 randomly include those having the front side facing the first secant camera 51 and those having the back side facing.

  In other words, the first secant camera 51 images one side of the plurality of tablets 2 conveyed by the conveyance drum 10. Here, the “one side” is a side facing the outside of the tablet 2 being conveyed by the conveyance drum 10 regardless of whether it is the front surface or the back surface of the tablet 2.

  In addition, the first secant camera 51 performs imaging for each row in which five tablets are arranged in a direction perpendicular to the conveyance direction of the conveyance drum 10. The reason for this is that it is difficult to focus the first secant camera 51 over a plurality of rows because the outer peripheral surface of the transport drum 10 is cylindrical.

  FIG. 6 is a diagram illustrating an example of an imaging result obtained by the first secant camera 51. The first secant camera 51 images one side of the plurality of tablets 2 conveyed by the conveyance drum 10. When each tablet 2 is held by suction on the transport drum 10, it is random whether the surface faces the outside or the inside. Therefore, the secant 7 is placed on one surface of the plurality of tablets 2 imaged by the first secant camera 51. The surface on which is formed and the back surface, which is the opposite surface, are randomly included. In the example of FIG. 6, among the tablets 2 arranged in five rows, the front surface is imaged for the left end and the center tablet 2, and the back surface of the other tablets 2 is imaged by the first secant camera 51. Image data as shown in FIG. 6, which is a result captured by the first secant camera 51, is transmitted to the control unit 3.

  Next, the tablets 2 in five columns and one row imaged by the first secant camera 51 are further transported by the transport drum 10 and reach a position that is in close proximity to the first transport belt 20. At this time, the blow mechanism of the transport drum 10 releases the suction state for the tablets 2 in the 5 rows and 1 row by blowing air to the 5 suction holes 11 in which the tablets 2 in the 5 rows and 1 row are sucked and held. To do. On the other hand, a negative pressure is applied to the suction hole 21 of the holding plate 22 of the first transport belt 20 at a position close to and facing the transport drum 10. Accordingly, the tablets 2 in the 5th row and the 1st row released from the suction state by the transport drum 10 are transferred from the suction holes 11 of the transport drum 10 to the suction holes 21 of the first transport belt 20 and sucked and held. . In order to reliably deliver such a tablet 2, the control unit 3 equalizes the conveyance speed of the conveyance drum 10 and the conveyance speed of the first conveyance belt 20, and the adsorption hole 11 and the adsorption hole 21 accurately. Control is performed to synchronize the operations of both transport units so as to face each other.

  When the tablet 2 is delivered from the transport drum 10 to the first transport belt 20, the tablet 2 moves as it is without rotating. That is, each tablet 2 is transferred from the transport drum 10 to the first transport belt 20 while maintaining the direction of the dividing line 7.

  Further, when the tablets 2 are transferred from the transport drum 10 to the first transport belt 20, the respective tablets 2 are turned upside down. In other words, the tablet 2 that has been sucked and held with the front surface on which the dividing line 7 is formed on the transport drum 10 facing outward is sucked and held in the suction hole 21 of the first transport belt 20 with the back surface facing outward. On the contrary, the tablet 2 that has been suction-held on the transport drum 10 with the back surface facing outward is sucked and held on the first transport belt 20 with the front surface facing outward. Therefore, each tablet 2 transported by the transport drum 10 is turned upside down while being maintained in its direction, is transferred to the first transport belt 20 and transported (step S4).

  Subsequently, the second secant camera 52 images the plurality of tablets 2 being transported by the first transport belt 20 (step S5). The first conveying belt 20 conveys the plurality of tablets 2 received by being reversed from the conveying drum 10 in five rows in a direction perpendicular to the conveying direction. The second secant camera 52 images the tablet 2 from the outside of the first transport belt 20. Therefore, the plurality of tablets 2 imaged by the second secant camera 52 also randomly include those having the front side and the back side facing the second secant camera 52. However, since each tablet 2 is reversed when the tablets 2 are transferred from the transport drum 10 to the first transport belt 20, the front and back of each tablet 2 imaged by the first secant camera 51 and the corresponding image captured by the second secant camera 52 are corresponding. The front and back of tablet 2 is completely reversed.

  In other words, the second secant camera 52 images the other surface of the plurality of tablets 2 conveyed by the first conveyance belt 20. Here, the “other surface” means a surface opposite to the one surface described above, and is transported by the first transport belt 20 regardless of whether it is the front surface or the back surface of the tablet 2. This is the surface facing the outside of the tablet 2.

  Since the transport surface of the first transport belt 20 is a substantially flat surface, the second secant camera 52 can capture images of the tablet 2 over a plurality of lines, but in this embodiment, it matches the imaging range of the first secant camera 51. As described above, the second secant camera 52 also performs imaging for each row in which five tablets are arranged in a direction perpendicular to the conveyance direction of the first conveyance belt 20.

  FIG. 7 is a diagram illustrating an example of an imaging result obtained by the second secant camera 52. The second secant camera 52 images the other surface of the plurality of tablets 2 conveyed by the first conveyance belt 20. The other surface is a surface opposite to one surface of the plurality of tablets 2 imaged by the first secant camera 51. Therefore, the back surface of the tablet 2 whose surface is imaged by the first secant camera 51 is imaged by the second secant camera 52. Conversely, the front surface of the tablet 2 whose back surface is imaged by the first secant camera 51 is imaged by the second secant camera 52.

  In the example of FIG. 7, contrary to FIG. 6, among the tablets 2 arranged in five rows, the back surface is imaged for the leftmost and center tablets 2, and the surface on which the secant lines 7 are formed for the other tablets 2. Is imaged by the second secant camera 52. Image data as shown in FIG. 7 which is a result of imaging by the second secant camera 52 is transmitted to the control unit 3. In FIG. 7, a dotted line indicates the dividing line 7 on the one surface side of the tablet 2 captured and recognized by the first secant camera 51 and is directly imaged by the second secant camera 52. is not.

  Next, the tablet 2 imaged by the second secant camera 52 is further transported by the first transport belt 20 and reaches a position facing the first inkjet head 61. And the 1st inkjet head 61 performs the printing process with respect to the tablet 2 (step S6). Here, the control unit 3 controls the printing process by the first inkjet head 61 based on the image data acquired by the first secant camera 51 and the second secant camera 52. FIG. 8 is a diagram illustrating an example of a print processing result by the first inkjet head 61.

  As described above, the first secant camera 51 images one surface of the plurality of tablets 2 conveyed by the conveyance drum 10. When the tablets 2 are transferred from the transport drum 10 to the first transport belt 20, the front and back of all the tablets 2 are reversed. Then, the second secant camera 52 images the other surface of the plurality of tablets 2 conveyed by the first conveyance belt 20. Therefore, the front and back surfaces of all tablets 2 are imaged by the first secant camera 51 and the second secant camera 52, and image data is acquired. Specifically, the back surface of the tablet 2 whose front surface is imaged by the first secant camera 51 is imaged by the second secant camera 52 (left and center tablets 2 in the examples of FIGS. 6 and 7). On the contrary, the front surface of the tablet 2 whose back surface is imaged by the first secant camera 51 is imaged by the second secant camera 52 (in the example of FIGS. 6 and 7, the second, fourth, and fifth tablets 2 from the left). ).

  The first inkjet head 61 performs a printing process on the other surface of the plurality of tablets 2 conveyed by the first conveyance belt 20. The control unit 3 includes a tablet 2 whose second surface is the front surface among the plurality of tablets 2 conveyed by the first conveyance belt 20 (second tablet 4 from the left in the example of FIGS. 7 and 8, fourth tablet 2 from the left). For this, the first inkjet head 61 is caused to perform the front surface printing process based on the front surface printing data. Here, for example, “ABCD” character data is used as the front surface print data.

  Moreover, the control part 3 makes the 1st inkjet head 61 perform the surface printing process on the surface along the predetermined direction with respect to the secant 7 engraved on the surface of the tablet 2. In the present embodiment, the first inkjet head 61 performs a printing process along a direction parallel to the secant 7 on the surface of the tablet 2. About the direction of the secant 7 in the tablet 2 whose other side is the surface among the plurality of tablets 2 conveyed by the first conveying belt 20, control is performed by performing image processing on the image data acquired by the second secant camera 52. It can be recognized by the unit 3 (the direction of the dividing line 7 indicated by the solid line in FIG. 8). As a result, as shown in FIG. 8, among the plurality of tablets 2 transported by the first transport belt 20, the tablet 2 whose other surface is the surface is along a direction parallel to the secant 7 engraved on the surface. Thus, the character string “ABCD” is printed on the surface of the tablet 2 by the first inkjet head 61.

  On the other hand, the control unit 3 has a back surface with respect to the tablet 2 whose left side is the back side among the plurality of tablets 2 transported by the first transport belt 20 (left and center tablets 2 in the examples of FIGS. 7 and 8). Based on the print data, the first inkjet head 61 is caused to perform the back surface printing process. Here, for example, character data “1234” is used as the back side print data.

  Further, the control unit 3 causes the first inkjet head 61 to perform the back surface printing process on the back surface of the tablet 2 along the same direction as the predetermined direction with respect to the secant 7 engraved on the surface of the tablet 2. . In this embodiment, the printing process is performed on the surface of the tablet 2 along a direction parallel to the secant line 7, and also on the back surface of the tablet 2 along the direction parallel to the secant line 7 on the front surface side. The first inkjet head 61 performs a printing process. Regarding the direction of the secant 7 on the front side of the tablet 2 whose other side is the back side among the plurality of tablets 2 conveyed by the first conveying belt 20, image processing is performed on the image data acquired by the first secant camera 51. Thus, the control unit 3 can recognize (the direction of the dividing line 7 indicated by the dotted line in FIG. 8). As a result, as shown in FIG. 8, among the plurality of tablets 2 transported by the first transport belt 20, the tablet 2 whose other surface is the back surface is along a direction parallel to the secant 7 engraved on the surface. Thus, the character string “1234” is printed on the back surface of the tablet 2 by the first inkjet head 61.

  Further, the control unit 3 performs fine adjustment (correction) of the printing position for each tablet 2 by the first inkjet head 61 based on the image data acquired by the second secant camera 52. Since the size of the suction hole 21 of the first transport belt 20 is slightly larger than the size of the tablet 2, the directionality of each tablet 2 is maintained when the tablet 2 is transferred from the transport drum 10 to the first transport belt 20. However, some variation occurs within the range of the suction holes 21. The control unit 3 detects a shift of the position of each tablet 2 in the suction hole 21 from the image data acquired by the second secant camera 52, and executes fine adjustment of the printing position based on the detection result. In this way, the printing process for the other side of the plurality of tablets 2 is executed.

  Next, the tablet 2 on which the printing process has been performed on the other side is further transported by the first transport belt 20 and reaches a position facing the first heater 76. As shown in FIG. 1, the first heater 76 is installed below the first conveyor belt 20, and when the tablet 2 reaches a position facing the first heater 76, the tablet 2 is in contact with the first conveyor belt 20. Is held downward. Since the first conveying belt 20 sucks and holds the tablet 2 by applying a negative pressure to the suction hole 21, it is also possible to hold the tablet 2 downward.

  The first heater 76 blows hot air on the other surface of the plurality of tablets 2 conveyed by the first conveyance belt 20 to dry the plurality of tablets 2 (step S7). By performing such a drying process, the ink discharged from the first inkjet head 61 to the plurality of tablets 2 can be quickly dried to prevent bleeding.

  Next, the tablets 2 in 5 columns and 1 row dried by the first heater 76 are further transported by the first transport belt 20 and reach a position in close proximity to the second transport belt 30. At this time, the blow mechanism of the first conveying belt 20 blows air to the five suction holes 21 in which the tablets 2 in the five rows and one row are held by suction, thereby sucking the tablets 2 in the five rows and one row. Is released. On the other hand, negative pressure is applied to the suction holes of the second conveyor belt 30 at positions close to and opposed to the first conveyor belt 20. Therefore, the tablets 2 in the 5th row and the 1st row released from the suction state by the first transport belt 20 are transferred from the suction holes 21 of the first transport belt 20 to the suction holes of the second transport belt 30 and sucked and held. It will be. In order to reliably deliver such tablets 2, the control unit 3 equalizes the conveyance speed of the first conveyance belt 20 and the conveyance speed of the second conveyance belt 30, and the suction holes of both conveyance belts are accurate. Control is performed so that the operations of both conveyor belts are synchronized so as to face each other.

  When the tablet 2 is delivered from the first conveyor belt 20 to the second conveyor belt 30, the tablet 2 moves as it is without rotating. That is, each tablet 2 is transferred from the first conveyor belt 20 to the second conveyor belt 30 while maintaining the direction of the dividing line 7.

  Further, when the tablets 2 are transferred from the first conveying belt 20 to the second conveying belt 30, the respective tablets 2 are turned upside down. That is, the tablet 2 that has been sucked and held on the first transport belt 20 with the front surface on which the dividing line 7 is formed facing outward is sucked and held on the second transport belt 30 with the back surface facing outward. On the contrary, the tablet 2 that has been suction-held by the first transport belt 20 with the back surface facing outward is sucked and held by the second transport belt 30 with the front surface facing outward. Therefore, each tablet 2 transported by the first transport belt 20 is turned upside down while being maintained in its direction, transferred to the second transport belt 30 and transported (step S8).

  Then, the 3rd secant camera 53 images the several tablet 2 currently conveyed by the 2nd conveyance belt 30 (step S9). The second conveyor belt 30 conveys the plurality of tablets 2 received by being reversed from the first conveyor belt 20 in five rows in a direction perpendicular to the conveyance direction. The third secant camera 53 images the tablet 2 from the outside of the second transport belt 30. Therefore, the front and back of each tablet 2 imaged by the third secant camera 53 is completely opposite to the front and back of the corresponding tablet 2 imaged by the second secant camera 52, while the correspondence captured by the first secant camera 51 is captured. The front and back of the tablet 2 to be completely matched. That is, as with the first secant camera 51, the third secant camera 53 images one side of the plurality of tablets 2 conveyed by the second conveyor belt 30.

  Since the transport surface of the second transport belt 30 is a substantially flat surface, the third secant camera 53 can capture the image of the tablet 2 over a plurality of lines. However, in this embodiment, it matches the imaging range of the first secant camera 51. As described above, the third secant camera 53 also performs imaging for each row in which five tablets are arranged in a direction perpendicular to the conveyance direction of the second conveyance belt 30.

  FIG. 9 is a diagram illustrating an example of an imaging result obtained by the third secant camera 53. Similar to the first secant camera 51, the third secant camera 53 images one side of the plurality of tablets 2 that are conveyed by the second conveying belt 30. Therefore, the imaging result obtained by the third secant camera 53 is substantially the same as the imaging result obtained by the first secant camera 51. In particular, with regard to the directionality of each of the plurality of tablets 2, the imaging result obtained by the third secant camera 53 and the imaging result obtained by the first secant camera 51 are completely the same.

  In the example of FIG. 9, as in FIG. 6, among the tablets 2 arranged in five rows, the left end and the center tablet 2 are imaged on the surface on which the secant 7 is formed, and the other tablets 2 have the back surface. The image is captured by the third secant camera 53. Image data as shown in FIG. 9 as a result of imaging by the third secant camera 53 is transmitted to the control unit 3. In FIG. 9, the dotted line shows the secant 7 on the other side of the tablet 2 captured and recognized by the second secant camera 52 and is directly imaged by the third secant camera 53. is not.

  However, the control unit 3 does not recognize the direction of the secant 7 engraved on the surface of the tablet 2 from the image data acquired by the third secant camera 53. This is because the direction of the secant 7 has already been recognized from the image data acquired by the first secant camera 51 for the tablet 2 whose one side is the surface, and there is no need to perform it again. Rather, when the control unit 3 recognizes the direction of the dividing line 7 from the image data acquired by the third dividing line camera 53, there is a possibility that the printing is reversed by 180 ° during the printing process by the second inkjet head 62 described later. There is.

  Imaging by the third secant camera 53 is performed in order to detect variations in the positions of the plurality of tablets 2 sucked and held by the second transport belt 30. The control unit 3 detects a shift in the position of each tablet 2 in the suction hole of the second transport belt 30 from the image data acquired by the third secant camera 53.

  Next, the tablet 2 imaged by the third secant camera 53 is further transported by the second transport belt 30 and reaches a position facing the second inkjet head 62. And the 2nd inkjet head 62 performs the printing process with respect to the tablet 2 (step S10). Here, the control unit 3 controls the printing process by the second inkjet head 62 based on the image data acquired by the first secant camera 51 and the second secant camera 52. FIG. 10 is a diagram illustrating an example of a print processing result by the second inkjet head 62.

  The second inkjet head 62 performs a printing process on one surface of the plurality of tablets 2 conveyed by the second conveyance belt 30. The controller 3 prints the front surface of the tablets 2 whose one side is the front surface among the plurality of tablets 2 transported by the second transport belt 30 (left and center tablets 2 in the examples of FIGS. 9 and 10). Based on the data, the second inkjet head 62 is caused to perform the surface printing process. Here, the front-side print data is “ABCD” character data similar to the above.

  Further, the control unit 3 causes the second inkjet head 62 to perform the surface printing process on the surface along the predetermined direction with respect to the secant 7 engraved on the surface of the tablet 2. In the present embodiment, the second inkjet head 62 performs a printing process along a direction parallel to the secant 7 on the surface of the tablet 2. About the direction of the secant 7 in the tablet 2 whose one side is the surface among the plurality of tablets 2 conveyed by the second conveying belt 30, control is performed by performing image processing on the image data acquired by the first secant camera 51. It can be recognized by the unit 3 (the direction of the dividing line 7 shown by the solid line in FIG. 10). As a result, as shown in FIG. 10, the tablet 2 whose one surface is the surface among the plurality of tablets 2 conveyed by the second conveyance belt 30 is along a direction parallel to the secant 7 engraved on the surface. Thus, the character string “ABCD” is printed on the surface of the tablet 2 by the second inkjet head 62.

  On the other hand, the control unit 3 controls the tablet 2 whose one surface is the back surface among the plurality of tablets 2 conveyed by the second conveying belt 30 (second, fourth, fifth tablets from the left in the examples of FIGS. 9 and 10). For 2), the second inkjet head 62 is caused to perform the back surface printing process based on the back surface print data. Here, the back side print data is character data “1234” similar to the above.

  Further, the control unit 3 causes the second inkjet head 62 to perform the printing process for the back side of the tablet 2 along the same direction as the predetermined direction with respect to the secant 7 engraved on the surface of the tablet 2. . In this embodiment, the printing process is performed on the surface of the tablet 2 along a direction parallel to the secant line 7, and also on the back surface of the tablet 2 along the direction parallel to the secant line 7 on the front surface side. The second inkjet head 62 performs a printing process. Regarding the direction of the front dividing line 7 in the tablet 2 whose one side is the back side among the plurality of tablets 2 conveyed by the second conveying belt 30, image processing is performed on the image data acquired by the second dividing line camera 52. Thus, the control unit 3 can recognize (the direction of the dividing line 7 indicated by the dotted line in FIG. 10). As a result, as shown in FIG. 10, among the tablets 2 that are transported by the second transport belt 30, the tablet 2 whose one surface is the back surface is along a direction parallel to the secant 7 engraved on the surface. Thus, the character string “1234” is printed on the back surface of the tablet 2 by the second inkjet head 62.

  Further, the control unit 3 performs fine adjustment (correction) of the printing position with respect to each tablet 2 by the second inkjet head 62 based on the image data acquired by the third secant camera 53. As described above, when the tablets 2 are transferred from the first conveying belt 20 to the second conveying belt 30, the orientation of each tablet 2 is maintained, but there is some variation in the range of the suction holes. Occurs. The control unit 3 detects the position shift of each tablet 2 in the suction hole of the second transport belt 30 from the image data acquired by the third secant camera 53, and finely adjusts the print position based on the detection result. Do it. In this way, the printing process for one surface of the plurality of tablets 2 is executed.

  Next, the tablet 2 on which the printing process has been performed on one side is further transported by the second transport belt 30 and reaches a position facing the first inspection camera 71. The first inspection camera 71 images one side of the plurality of tablets 2 conveyed by the second conveyance belt 30 and images the result of the printing process on one side of the plurality of tablets 2 by the second inkjet head 62. The first inspection camera 71 transmits the acquired image data to the control unit 3. Based on the image data acquired by the first inspection camera 71, the control unit 3 confirms the print processing result of the second inkjet head 62 on one surface of the plurality of tablets 2 (step S11).

  Subsequently, the tablet 2 in which the print processing result on one side is inspected is further transported by the second transport belt 30 and reaches a position facing the second heater 77. The second heater 77 blows hot air on one surface of the plurality of tablets 2 conveyed by the second conveyance belt 30 to dry the plurality of tablets 2 (step S12). By performing such a drying process, the ink ejected from the second inkjet head 62 to the plurality of tablets 2 can be quickly dried to prevent bleeding.

  Next, the tablets 2 in 5 columns and 1 row dried by the second heater 77 are further transported by the second transport belt 30 and reach a position in close proximity to the third transport belt 40. At this time, the blowing mechanism of the second conveyor belt 30 blows air to the five suction holes in which the tablets 2 in the five rows and one row are held by suction, thereby changing the suction state to the tablets 2 in the five rows and one row. To release. On the other hand, a negative pressure is applied to the suction hole of the third conveyor belt 40 at a position close to and opposed to the second conveyor belt 30. Therefore, the tablets 2 in the 5th row and the 1st row released from the suction state by the second transport belt 30 are transferred from the suction holes of the second transport belt 30 to the suction holes of the third transport belt 40 and held by suction. It becomes. In order to reliably deliver such a tablet 2, the control unit 3 equalizes the conveyance speed of the second conveyance belt 30 and the conveyance speed of the third conveyance belt 40, and the suction holes of both conveyance belts are accurate. Control is performed so that the operations of both conveyor belts are synchronized so as to face each other.

  When the tablet 2 is delivered from the second conveyor belt 30 to the third conveyor belt 40, the tablet 2 moves as it is without rotating. That is, each tablet 2 is transferred from the second conveyor belt 30 to the third conveyor belt 40 while maintaining the direction of the dividing line 7.

  Further, when the tablets 2 are transferred from the second conveyance belt 30 to the third conveyance belt 40, the respective tablets 2 are turned upside down. In other words, the tablet 2 that has been sucked and held on the second transport belt 30 with the front surface on which the dividing line 7 is formed facing outward is sucked and held on the third transport belt 40 with the back surface facing outward. On the contrary, the tablet 2 that has been sucked and held by the second transport belt 30 with the back surface facing outward is sucked and held by the third transport belt 40 with the front surface facing outward. Therefore, each tablet 2 transported by the second transport belt 30 is turned upside down while being maintained in its direction, transferred to the third transport belt 40 and transported (step S13).

  Subsequently, the second inspection camera 72 images the plurality of tablets 2 being transported by the third transport belt 40. Similar to the first conveyor belt 20, the third conveyor belt 40 holds and holds the plurality of tablets 2 with the other surface of the plurality of tablets 2 facing outward. Therefore, the second inspection camera 72 images the other surface of the plurality of tablets 2 conveyed by the third conveyance belt 40 and images the result of the printing process on the other surface of the plurality of tablets 2 by the first inkjet head 61. . The second inspection camera 72 transmits the acquired image data to the control unit 3. Based on the image data acquired by the second inspection camera 72, the control unit 3 confirms the print processing result of the first inkjet head 61 for the other surface of the plurality of tablets 2 (step S14).

  Finally, a sorting process is performed on the tablets 2 that have been inspected on both sides (step S15). The tablet 2 having no problem in the inspection results of the front and back surfaces in step S11 and step S14, that is, the non-defective tablet 2, is put into the non-defective duct 48 by air blowing from the blow mechanism. The tablet 2 discharged into the non-defective duct 48 is collected in the non-defective product collection box 58. On the other hand, the tablet 2 having a problem in the inspection result on both the front and back surfaces, that is, the defective tablet 2 is introduced into the defective product duct 46 by air blowing from the blow mechanism. The tablet 2 discharged to the defective product duct 46 is collected in the defective product box 56. As described above, the printing process on the tablet 2 in the tablet printing apparatus 1 is completed.

  In the present embodiment, based on the image data of the front and back surfaces of the plurality of tablets 2 acquired by the first secant camera 51 and the second secant camera 52, a predetermined direction with respect to the front secant line 7 with respect to the surface of the tablet 2. The front surface printing process is performed along the back surface, and the back surface printing process is performed on the back surface of the tablet 2 along the same direction as the predetermined direction of the back surface. For this reason, the printing process can be performed in the same direction with respect to the secant 7 on both the front and back sides of the tablet 2.

  While the embodiments of the present invention have been described above, the present invention can be modified in various ways other than those described above without departing from the spirit of the present invention. For example, in each of the above embodiments, the printing process is performed on the front and back along the direction parallel to the secant line 7 of the tablet 2. However, the present invention is not limited to this, and printing is performed on the front and back of the tablet 2 in the same direction. In this case, the printing process can be performed in an arbitrary direction with respect to the dividing line 7.

  Further, the reference for the printing process direction is not limited to the secant line 7, but may be any mark for identifying the direction, for example, an arrow engraved on the surface of the tablet 2. May be. If the mark can identify the direction, the printing process similar to the above-described embodiment can be performed along a predetermined direction with respect to the mark.

  Moreover, in the said embodiment, although the secant 7 was engraved on the surface of the tablet 2, as mentioned above, the surface where the secant 7 is provided is only used as the surface for convenience. It is good also considering the surface of the provided side as a back surface.

  Moreover, the shape of the tablet 2 is not limited to a disk shape, and may be another shape such as a substantially elliptical shape or a rod shape. In this case, the suction hole of each transport unit is in accordance with the shape of the tablet 2.

  Moreover, in the said embodiment, although it was made to convey the tablet 2 by the unit of 5 columns 1 line, it is not limited to this, You may make it convey the tablet 2 by 1 row, The tablets 2 may be transported in two or more rows.

  Further, in the above embodiment, the tablets 2 are classified into non-defective products or defective products based on the inspection results by the first secant camera 51 and the second secant camera 52, but the tablet printing apparatus 1 performs the inspection. It is also possible to select a mode in which only print processing is performed. When such a mode is selected, all tablets 2 that have undergone the printing process are put into the uninspected duct 47 from the third transport belt 40. The tablet 2 put in the uninspected duct 47 is collected in the uninspected box 57. Furthermore, a mode for performing only the inspection process for the uninspected tablet 2 may be set in the tablet printing apparatus 1.

  The tablet printing method according to the present invention can be suitably used for printing on both the front and back surfaces of a pharmaceutical tablet or the like on which a dividing line is engraved.

DESCRIPTION OF SYMBOLS 1 Tablet printer 2 Tablet 3 Control part 7 Split line 8 Hopper 10 Transport drum 20 1st transport belt 30 2nd transport belt 40 3rd transport belt 51 1st secant camera 52 2nd secant camera 53 3rd secant camera 61 1st inkjet Head 62 Second inkjet head 71 First inspection camera 72 Second inspection camera 76 First heater 77 Second heater

Claims (3)

A tablet printing method for performing a printing process on a tablet whose surface is engraved with a secant line,
A first imaging step of imaging one side of a plurality of tablets being conveyed;
A second imaging step of imaging the other side of the plurality of tablets;
Based on the image data acquired in the first imaging step and the second imaging step, a back side printing step for performing a printing process along a predetermined direction with respect to the secant on the back side of the plurality of tablets;
A tablet printing method comprising: The tablet printing method according to claim 1,
A tablet printing method, further comprising a surface printing step of performing a printing process on the surfaces of the plurality of tablets along the same direction as the predetermined direction based on the image data. In the tablet printing method according to claim 1 or 2,
The tablet printing method, wherein the predetermined direction is a direction parallel to the secant.

Images