UV printer with anti-ink settling using a removable ink pack

Abstract

The present invention relates to an ink sedimentation prevention UV printer using a movable ink pack designed to prevent ink sedimentation without a separate stirring device by utilizing the movement inertia of a transfer unit and to stabilize supply pressure by minimizing the ink supply path. The printer comprises: a printing device body that performs flatbed printing, including a bed on which a printing object is placed and a driving unit; a transfer unit installed to be reciprocally movable on a printing area by the driving unit of the printing device body; an ink discharge module mounted on the transfer unit to discharge ink onto a printing object; and a movable ink source that is directly mounted on the transfer unit and moves integrally together with the transfer unit during reciprocating movement to prevent ink sedimentation.

Description

Technology Field

[0001] The present invention relates to an ink sedimentation prevention UV printer using a movable ink pack, and more specifically, to an ink sedimentation prevention UV printer using a movable ink pack designed to prevent ink sedimentation without a separate stirring device by utilizing the movement inertia of a transfer unit, and to stabilize the supply pressure by minimizing the ink supply path. Background Technology

[0003] Generally, UV (Ultra Violet) printers utilize UV-curing ink and employ a method of instantaneously curing the ink by irradiating it with ultraviolet light immediately after spraying it onto the material. Since these UV printers can print on a wide range of materials—including not only paper but also plastic, metal, glass, and wood—they are utilized in extensive industrial fields, such as the production of outdoor advertisements, smartphone cases, and promotional items.

[0004] In particular, the use of white ink to form the base color is essential to achieve vivid colors on transparent or colored materials. White ink contains a large amount of metallic pigments, such as titanium dioxide (TiO2), to enhance opacity; however, because this pigment has a higher specific gravity than other pigments, sedimentation is prone to occur, causing the ink to sink to the bottom within a short period of time if it remains stationary. If ink settles, it leads to critical problems such as nozzle clogging or uneven density in the printed material.

[0005] Conventional UV printers have adopted a White Ink Circulation System (WICS) that uses a pump to continuously circulate ink or install a mechanical stirrer inside a large-capacity ink tank to solve these problems. However, these conventional technologies complicate the structure of the equipment and cause manufacturing costs to increase.

[0006] Above all, conventional methods require a long tube line to supply ink to the print head, as the ink tank is fixed to one side of the main body, far from the transfer unit. In this long tube section, ink flow is prone to stagnation, raising concerns about sedimentation. Furthermore, there was a problem where ink starvation occurred during high-speed printing due to pressure loss caused by the length of the tube, preventing the smooth supply of ink to the print head.

[0007] Accordingly, the inventor developed a new structure of UV printer that drastically reduces the tube length by directly mounting an ink pack on the transfer unit and utilizes the reciprocating kinetic energy of the carriage as ink stirring energy.

[0008] Meanwhile, the aforementioned background technology is technical information that the inventor possessed for the derivation of the present invention or acquired during the process of deriving the present invention, and it cannot necessarily be considered publicly known technology disclosed to the general public prior to the filing of the present invention. Prior art literature

[0010] Registered Patent Publication No. 10-1306005 (Published Sep. 12, 2013) The problem to be solved

[0011] The present invention has been devised to solve the problems of the prior art described above. The objective of the present invention is to provide an ink sedimentation prevention UV printer using a movable ink pack that effectively prevents the sedimentation of high-density pigments without the need for a separate power device or a complex circulation system by directly mounting an ink supply source on a transfer unit and utilizing the inertial force generated during the reciprocating movement of the carriage to naturally flow the ink.

[0012] In addition, another objective of the present invention is to provide an ink sedimentation prevention UV printer using a movable ink pack that can continuously maintain a high-quality printing condition by reducing pressure loss in the ink supply path and damping pulsation by constructing a straight-tube ink line with a minimized distance between the ink pack and the ink ejection module and placing a damper therebetween.

[0013] The technical problems of the present invention are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0015] A UV printer that prevents ink sedimentation using a movable ink pack according to a first embodiment of the present invention comprises: a printing device body that performs flatbed printing, including a bed on which a printing object is placed and a driving unit; a transfer unit installed to be reciprocally movable on a printing area by the driving unit of the printing device body; an ink discharge module mounted on the transfer unit to discharge ink onto a printing object; and a movable ink source that is directly mounted on the transfer unit and moves integrally together with the transfer unit during reciprocating movement to prevent ink sedimentation.

[0016] A UV printer that prevents ink sedimentation using a movable ink pack according to the first embodiment of the present invention may further include a mesh-shaped disc filter disposed on the ink flow path between the movable ink source and the ink discharge module to filter out foreign substances or aggregated pigment particles within the ink.

[0017] In the ink sedimentation prevention UV printer using a movable ink pack according to the first embodiment of the present invention, the tube connecting the movable ink source and the ink discharge module may be made of a black or opaque UV-blocking material so as not to allow external ultraviolet rays to pass through.

[0018] A UV printer that prevents ink sedimentation using a movable ink pack according to the first embodiment of the present invention may further include a damper disposed between the movable ink source and the ink discharge module to maintain a constant ink supply pressure and dampen pulsation.

[0019] An ink sedimentation prevention UV printer using a movable ink pack according to the first embodiment of the present invention may further include a connecting tube that connects the movable ink source, the damper, and the damper and the ink discharge module by the shortest distance, respectively.

[0020] In one embodiment, the movable ink supply source may include a pouch made of a flexible material filled with ink; and a hard case that accommodates the pouch and is detachably coupled to the transfer unit.

[0021] In one embodiment, the movable ink source can physically prevent the sedimentation of pigment without a separate stirring device by causing the internal ink to flow due to the inertial force generated during the acceleration / deceleration reciprocating movement of the transfer unit.

[0022] In one embodiment, the ink stored in the movable ink source may include white ink or varnish liquid, which is prone to pigment precipitation due to differences in specific gravity.

[0023] A UV printer that prevents ink sedimentation using a movable ink pack according to the first embodiment of the present invention may further include a UV LED curing module that is respectively disposed on both sides of the ink discharge module with respect to the direction of movement of the transfer unit and immediately cures the discharged ink.

[0024] A UV printer that prevents ink sedimentation using a movable ink pack according to the first embodiment of the present invention may further include a sensor unit that detects the remaining amount of the movable ink source.

[0025] A UV printer that prevents ink sedimentation using a removable ink pack according to the first embodiment of the present invention may further include a control unit that provides a notification when ink is low based on a signal from the sensor unit.

[0026] In one embodiment, the bed may include: a mounting shelf forming a plane on which a printing object is placed; an installation frame installed on the upper side of the mounting shelf so as to be positioned to surround a printing object placed inside; a plurality of fastening elastic covers made of an elastic material capable of expansion and contraction, installed covering the inner surface of each side of the installation frame, and fastening the printing object placed on the mounting shelf so as not to move by individually expanding or contracting before printing begins; and a plurality of fastening guides installed on the inner surface of each side of the installation frame to support the fastening elastic covers and simultaneously press them against the printing object.

[0027] In one embodiment, the fastening guide may include: a drive shaft installed to be rotatable along the inner side of one side of the installation frame; a shaft rotation drive motor in which the drive shaft is installed by axial coupling on one side of the drive shaft to drive the drive shaft in a forward or reverse direction; a plurality of first bevel gears installed spaced apart at regular intervals along the shaft rotation drive motor; a plurality of second bevel gears connected and installed to be perpendicular to the first bevel gears and rotate together as the first bevel gear rotates; a plurality of fastening modules installed by axial coupling for each second bevel gear, which extend as the second bevel gear rotates in the forward direction and contract as the second bevel gear rotates in the reverse direction; and a plurality of fastening frames, one end of which is connected to be rotatable on the inner circumference of the installation frame and the other end of which supports the fastening elastic cover, and the middle end of which is connected to the fastening module and rotates as the fastening module extends to push the fastening elastic cover and press it against a printing object.

[0028] In one embodiment, the fastening module may include: a module housing formed in a cylindrical tube shape; an inner nut formed in a cylindrical tube shape with an outer diameter corresponding to the inner diameter of the module housing, having threads formed along its inner surface; a nut guide extended along the circumference of the inner nut; a guide groove extended along the inner surface of the module housing so that the nut guide can be seated and moved; a guide support spring installed at the front end of the guide groove, with the inner nut positioned along the inside, to support the nut guide by pressing it against the rear end of the guide groove; and a driving bolt, the rear end of which is installed by axial coupling with the second bevel gear, and the front end of which is connected by engaging with the inner nut by a bolt-nut coupling, and which rotates together with the second bevel gear as it rotates to simultaneously move the inner nut and the module housing forward toward the fastening elastic cover.

[0029] In one embodiment, the fastening frame may include: a frame body, one end of which is rotatably connected to the inner circumference of the installation frame; a cover support, which is installed at the other end of the frame body to support the fastening elastic cover; an incision formed extending in the longitudinal direction while cutting through the middle of the frame body; a connecting guide, which is connected to allow sliding movement along the incision; an opening formed in the connecting guide to allow the module housing to be placed therein; and connecting pins, which are each installed on both sides of the opening and connected to both sides of the module housing placed in the opening to support the module housing.

[0030] In one embodiment, the fastening elastic cover is formed in the shape of a pouch that contains a sealed internal space and is supported by the fastening guide, and when it comes into close contact with a printed object, it expands as fluid is supplied into the internal space to fasten the printed object.

[0031] A UV printer that prevents ink sedimentation using a movable ink pack according to a second embodiment of the present invention comprises: a printing device body that performs flatbed printing, including a bed on which a printing object is placed and a driving unit; a transfer unit installed to be reciprocally movable on a printing area by the driving unit of the printing device body; an ink discharge module mounted on the transfer unit to discharge ink onto a printing object; a movable ink source directly mounted on the transfer unit to prevent ink sedimentation by moving integrally together with the reciprocating movement of the transfer unit; and a damper disposed between the movable ink source and the ink discharge module to maintain a constant ink supply pressure and dampen pulsation.

[0032] A method for controlling an ink sedimentation prevention UV printer using a movable ink pack according to an embodiment of the present invention comprises: an initial driving step of controlling a driving unit of an ink sedimentation prevention UV printer using a movable ink pack to reciprocate a transfer unit including acceleration and deceleration on a printing area; an ink sedimentation prevention step of preventing ink sedimentation by using the inertial force generated by the reciprocating movement in the initial driving step to flow ink inside a movable ink source that moves integrally with the transfer unit; and an ink discharge step of discharge ink onto a printing target placed on a bed through an ink discharge module in synchronization with the movement of the transfer unit. Effects of the invention

[0034] According to an embodiment of the present invention, since the internal ink is continuously shaken by the inertial force generated as the movable ink source reciprocates integrally with the transfer unit, the sedimentation of pigment is physically prevented without a separate stirring motor or complex circulation pump, thereby having the effect of maintaining a uniform concentration of white ink or varnish.

[0035] In addition, since the path from the ink pack to the ink ejection module is connected by a straight tube structure that is the shortest distance, it can solve the problem of pressure drop that occurs while passing through a long tube, thereby maintaining a constant ink ejection pressure, and has the advantage of significantly reducing nozzle clogging by eliminating the ink stagnation section within the tube.

[0036] In addition, the simplified structure of the ink supply system enables equipment miniaturization and reduces manufacturing costs, while allowing users to easily replace or maintain ink packs, thereby significantly improving the convenience of equipment operation.

[0037] Finally, through the fastening cover made of elastic material applied to the bed system and the fastening guide that drives it, various printing objects with irregular shapes or uneven surfaces can be firmly fixed, thereby increasing printing precision.

[0038] The effects of the present invention are not limited to those mentioned above, and various effects may be included within the scope obvious to a person skilled in the art from the contents described below. Brief explanation of the drawing

[0040] FIGS. 1 to 4 are drawings illustrating the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a first embodiment of the present invention. FIG. 5 is a table showing the specifications of an ink sedimentation prevention UV printer using a movable ink pack according to the first embodiment of the present invention. Figures 6 and 7 are drawings showing the configuration of the bed of Figure 1. Figure 8 is a drawing showing the detailed configuration of the fastening guide of Figure 6. FIGS. 9 to 12 are drawings showing the detailed configuration of the fastening module of FIG. 8. FIGS. 13 to 16 are drawings showing the detailed configuration of the fastening frame of FIG. 8. FIG. 17 is a diagram showing the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a second embodiment of the present invention. FIG. 18 is a diagram showing the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a third embodiment of the present invention. FIG. 19 is a flowchart illustrating a method for controlling a UV printer that prevents ink sedimentation using a movable ink pack according to one embodiment of the present invention. FIG. 20 is a drawing showing an ink sedimentation prevention UV printer using a movable ink pack controlled by the ink sedimentation prevention UV printer control method using a movable ink pack according to one embodiment of the present invention of FIG. 19. Specific details for implementing the invention

[0041] The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the invention are different but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in relation to one embodiment. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. Accordingly, the following detailed description is not intended to be limiting, and the scope of the invention is limited only by the appended claims, including all equivalents to those claimed therein, provided appropriately described. Similar reference numerals in the drawings refer to the same or similar functions across various aspects.

[0042] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0043] FIGS. 1 to 4 are drawings illustrating the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a first embodiment of the present invention.

[0044] Referring to FIGS. 1 to 4, an ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention includes a printing device body (100), a transfer unit (200), an ink discharge module (300), and a movable ink source (400).

[0045] The printing device body (100) forms a basic framework for printing operations and includes a bed (500) on which a printing object is placed and a frame structure that supports it. Additionally, the printing device body (100) performs the role of supplying power and controlling each unit so that the flatbed printing process can be carried out smoothly by performing precise control in the X-axis and Y-axis directions through a drive unit (not shown in the drawing for convenience of explanation) provided inside.

[0046] The transfer unit (200) is installed to be able to reciprocate left and right along a guide rail or gantry system formed by the drive unit of the printing device body (100). The transfer unit (200) is a key transfer means that determines printing precision, and is designed to minimize vibration even during high-speed reciprocating motion, and moves together with the ink discharge module (300) and the movable ink supply source (400) to be described later.

[0047] The ink ejection module (300) is mounted on the transfer unit (200) and ejects ink in the form of fine droplets onto a printing target located below. The ink ejection module (300) may utilize various ejection methods, such as a piezoelectric method or a thermal method, and precisely sprays UV-curable ink to realize a high-resolution image.

[0048] The movable ink supply source (400) is directly mounted on the transfer unit (200) and configured to move together as a single unit without a separate tube extension during the reciprocating movement of the transfer unit (200). The movable ink supply source (400) solves the pressure loss problem caused by the need for a long supply line in the conventional fixed ink tank method, and above all, physically prevents pigment sedimentation by continuously flowing the ink through the transfer of the continuous reciprocating acceleration and deceleration kinetic energy of the transfer unit (200) into the ink pack.

[0049] A UV printer (10) that prevents ink sedimentation using a movable ink pack according to one embodiment of the present invention, having the configuration as described above, has the effect of stabilizing the supply pressure by drastically shortening the ink supply path by placing the ink supply source on the transfer unit (200) which is closest to the ink discharge module (300), and preventing ink sedimentation without a separate stirrer by utilizing the movement inertia of the carriage, thereby maintaining uniform print quality.

[0051] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration described above may further include a mesh-shaped disc filter (not shown in the drawing for convenience of explanation) disposed on the ink flow path between the movable ink source (400) and the ink discharge module (300) to filter out foreign substances or aggregated pigment particles in the ink.

[0052] In an ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration as described above, the tube connecting the movable ink source (400) and the ink discharge module (300) may be made of a black or opaque UV-blocking material so as not to allow external ultraviolet rays to pass through.

[0053] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration described above may further include a damper (not shown in the drawing for convenience of explanation).

[0054] The damper is positioned between the movable ink source (400) and the ink discharge module (300) to form a flow path. The damper performs a cushioning function to prevent sloshing or pressure changes (pulsations) that may occur inside the ink when the movable ink source (400) moves at high speed together with the transfer unit (200) from directly affecting the nozzle surface of the ink discharge module (300). Additionally, the damper maintains a constant ink supply pressure while retaining a certain amount of ink inside, thereby preventing a momentary ink shortage from occurring when the ink discharge module (300) discharges ink.

[0055] The ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration described above has the effect of preventing nozzle clogging or ink droplet formation by immediately relieving fine bubble generation or pressure imbalance caused by shaking of the movable ink source (400) by placing a damper on a short ink path.

[0057] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration as described above may further include a connecting tube (not shown in the drawing for convenience of explanation).

[0058] A connecting tube (not shown in the drawing for convenience of explanation) physically connects the movable ink source (400) and the damper, and the damper and the ink discharge module (300), respectively, to provide a passage for the ink to move. The connecting tube (not shown in the drawing for convenience of explanation) is positioned at the shortest distance so as not to twist or fold in the narrow space within the transfer unit (200), and is made of a chemical-resistant material to prevent corrosion by UV ink.

[0059] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration as described above has the effect of maximizing the convenience of maintenance by configuring the ink line in the shortest possible straight line shape, thereby minimizing the time the ink stays inside the line and eliminating ink sedimentation and clogging sections that may occur in a long tube line.

[0061] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration as described above may further include a pouch (not shown in the drawing for convenience of explanation) and a hard case (not shown in the drawing for convenience of explanation).

[0062] The pouch (not shown in the drawing for the sake of illustrative purposes) forms a sealed space within which ink can be filled under a vacuum and is made of a flexible material that can deform in response to external physical impact or flow. As the ink is consumed, the pouch naturally shrinks in volume, preventing air from entering the interior and maximizing the fluidity of the ink to respond sensitively to external movements.

[0063] A hard case (not shown in the drawing for convenience of explanation) accommodates and protects a soft pouch (not shown in the drawing for convenience of explanation) inside, and is securely and detachably coupled to a designated slot of the transfer unit (200). The hard case (not shown in the drawing for convenience of explanation) blocks external light to prevent the curing of UV ink, and supports the shape of the pouch (not shown in the drawing for convenience of explanation) to a certain extent when the pouch moves due to the movement inertia of the transfer unit (200), thereby preventing damage to the pouch (not shown in the drawing for convenience of explanation).

[0064] The mobile ink supply source (400) having the configuration described above stores the ink in the form of a soft pouch rather than a cartridge, thereby promoting the vortex phenomenon that occurs when the ink collides with the inner wall of the pouch during the movement of the carriage, and can be easily detached through a hard case when replacing the ink, thus increasing work efficiency.

[0066] The movable ink source (400) according to the present invention physically prevents the sedimentation of pigment without a separate stirring device by causing the internal ink to flow due to the inertial force generated during the reciprocating movement of the transfer unit (200).

[0067] Specifically, the movable ink source (400) utilizes the phenomenon in which the ink filled inside shifts in the direction of movement due to the law of inertia at the moment when the transfer unit (200) moves to the right and stops or changes direction to the left. The movable ink source (400) creates an irregular fluid flow inside the pouch (not shown in the drawing for convenience of explanation) due to this shifting phenomenon, causing heavy pigment particles to continuously float without giving them time to settle to the bottom.

[0068] A movable ink source (400) having the configuration described above has the effect of reducing energy consumption and noise of the printer and improving the durability of the equipment by preventing ink sedimentation using only natural physical laws without complex devices such as mechanical stirring motors or circulation pumps.

[0070] The ink stored in the movable ink source (400) according to the present invention may include white ink or varnish liquid, which is prone to pigment precipitation due to differences in specific gravity.

[0071] White ink contains a large amount of high-density, heavy pigments such as titanium dioxide (TiO2) to increase opacity, and has the characteristic of causing sedimentation and layer separation within a short time while stationary. The movable ink source (400) solves the problems of nozzle clogging and concentration reduction of white ink, which are most critical to print quality, by exposing this white ink to the constant movement of the transfer unit (200).

[0072] A movable ink supply source (400) having the configuration described above can maintain a uniform dispersion state of white ink without establishing a separate white ink circulation system (WICS), thereby having the effect of stably realizing a high-quality white layer when printing colored media or back printing.

[0074] An ink sedimentation prevention UV printer (10) using a movable ink pack according to one embodiment of the present invention having the configuration as described above may further include a UV LED curing module (not shown in the drawing for convenience of explanation).

[0075] A UV LED curing module (not shown in the drawing for convenience of explanation) is positioned on each of the left and right sides of the ink ejection module (300) with respect to the direction of movement of the transfer unit (200). The UV LED curing module (not shown in the drawing for convenience of explanation) irradiates ultraviolet light immediately upon the ink being ejected from the ink ejection module (300) and landing on the object to be printed, thereby instantly curing the ink.

[0076] The ink sedimentation prevention UV printer (10) using a movable ink pack having the configuration described above can obtain a clear image without ink smudging by curing the ink of uniform concentration supplied through the movable ink source (400) immediately after impact, and has the effect of being able to print on heat-sensitive materials by using an LED method that generates less heat.

[0078] An ink sedimentation prevention UV printer (10) using a movable ink pack having the configuration described above may further include a sensor unit (not shown in the drawing for convenience of explanation).

[0079] A sensor unit (not shown in the drawing for convenience of explanation) is installed on one side of a movable ink supply source (400) or placed on an ink line to detect the remaining amount of ink in real time. Various methods may be applied to the sensor unit (not shown in the drawing for convenience of explanation), such as a weight detection method, an optical level detection method, or a mechanical contact method that detects changes in the thickness of the pouch, and the detected signal is converted into an electrical signal and transmitted.

[0080] The ink sedimentation prevention UV printer (10) using a movable ink pack having the configuration described above has the effect of preventing printing failure due to ink depletion during printing by automatically monitoring the remaining ink amount through a sensor, which may be difficult to visually check due to the characteristics of the movable ink source (400) that moves with the carriage.

[0082] An ink sedimentation prevention UV printer (10) using a movable ink pack having the configuration described above may further include a control unit (not shown in the drawing for convenience of explanation).

[0083] A control unit (not shown in the drawing for convenience of explanation) analyzes a signal received from a sensor unit (not shown in the drawing for convenience of explanation) and, when the remaining ink level falls below a preset threshold, provides an ink shortage notification to the user through a warning sound or a display. The control unit (not shown in the drawing for convenience of explanation) performs control to temporarily stop the printing operation or move the transfer unit (200) to the ink replacement position as needed.

[0084] The ink sedimentation prevention UV printer (10) using a movable ink pack having the configuration described above provides an interface that enhances user convenience, thereby supporting efficient ink management and ensuring stable operation of the equipment.

[0086] Figures 6 and 7 are drawings showing the configuration of the bed of Figure 1.

[0087] Referring to FIGS. 6 and 7, the bed (500) includes a mounting shelf (510), an installation frame (520), a fastening elastic cover (530), and a fastening guide (540).

[0088] The mounting shelf (510) provides a flat bottom surface on which a printing object is placed and is machined to maintain a precise level. The mounting shelf (510) has the rigidity to stably support printing objects of various thicknesses and sizes.

[0089] The installation frame (520) is installed along the upper edge of the mounting shelf (510) in a '□' shape or a similar shape to partition the printing area. The installation frame (520) serves as a base on which the fastening guide (540) and the fastening elastic cover (530), which will be described later, are installed.

[0090] The fastening elastic cover (530) is made of an elastic material with excellent elasticity, such as rubber or silicone, and is installed in a manner that covers the inner surface of each side of the installation frame (520). The fastening elastic cover (530) is normally contracted, but expands or is physically pushed out during the printing preparation stage to press and secure the side of the object to be printed placed on the mounting shelf (510).

[0091] The fastening guide (540) is embedded inside the installation frame (520) or installed on the inner side to mechanically push or support the fastening elastic cover (530). The fastening guide (540) provides a driving force that adheres the fastening elastic cover (530) tightly to the surface of the printing object in accordance with the shape of the printing object.

[0092] The bed (500) having the configuration described above can firmly fix printing objects, such as porous materials or materials with irregular surfaces that are difficult to fix by vacuum suction, using the frictional force and pressure of the elastic cover, and has the effect of quickly completing printing preparation without taping work.

[0094] Figure 8 is a drawing showing the detailed configuration of the fastening guide of Figure 6.

[0095] Referring to FIG. 8, the fastening guide (540) includes a drive shaft (541), a shaft rotation drive motor (542), a first bevel gear (543), a second bevel gear (544), a fastening module (545), and a fastening frame (546).

[0096] The drive shaft (541) is rotatably installed and extends along the length of the installation frame (520) and serves as an axis for transmitting power.

[0097] The shaft rotation drive motor (542) is connected to the end of the drive shaft (541) and generates forward or reverse rotational torque according to an electrical signal.

[0098] A plurality of first bevel gears (543) are fixed at regular intervals on the drive shaft (541) and rotate together with the drive shaft (541).

[0099] The second bevel gear (544) meshes with the first bevel gear (543) at a 90-degree angle to change the direction of rotation to a vertical direction.

[0100] The fastening module (545) is connected to each second bevel gear (544) and acts as an actuator that converts rotational motion into linear reciprocating motion. The length of the fastening module (545) is extended or contracted depending on the rotational direction of the second bevel gear (544).

[0101] The fastening frame (546) is a structure that receives the linear motion of the fastening module (545), rotates or tilts, and actually pushes out the fastening elastic cover (530). The fastening frame (546) has one end hinged and the middle end connected to the fastening module (545) to transmit strong force using the lever principle.

[0102] The fastening guide (540) having the configuration described above can simultaneously operate multiple fastening points with a single motor drive to press the entire edge of the printed object with uniform force, and has the effect of maintaining a strong fastening force through mechanical gear coupling.

[0104] FIGS. 9 to 12 are drawings showing the detailed configuration of the fastening module of FIG. 8.

[0105] Referring to FIGS. 9 to 12, the fastening module (545) includes a module housing (5451), an inner nut (5452), a nut guide (5453), a guide groove (5454), a guide support spring (5455), and a driving bolt (5456).

[0106] The module housing (5451) is a cylindrical member that forms the overall exterior.

[0107] The inner nut (5452) is inserted into the module housing (5451) and moves forward or backward according to the rotation of the drive bolt (5456).

[0108] The nut guide (5453) and guide groove (5454) serve as a key and keyway that guide the inner nut (5452) to move only in a straight line without rotating.

[0109] The guide support spring (5455) is installed inside the guide groove (5454) and elastically supports the nut guide (5453). In particular, the guide support spring (5455) according to the embodiment of the present invention has a torque limiter function that prevents the fastening frame (546) from damaging the printed object by contracting to perform a cushioning action when excessive pressure occurs when pressing the printed object.

[0110] The drive bolt (5456) acts as a lead screw that receives rotational force from the second bevel gear (544) and pushes or pulls the inner nut (5452) through the threads.

[0111] The fastening module (545) having the configuration described above enables precise position control through a screw coupling method, and in particular, by applying a cushioning structure through a guide support spring (5455), it has the advanced effect of enabling safe and secure fastening regardless of the material or strength of the object to be printed.

[0113] FIGS. 13 to 16 are drawings showing the detailed configuration of the fastening frame of FIG. 8.

[0114] Referring to FIGS. 13 to 16, the fastening frame (546) includes a frame body (5461), a cover support (5462), an incision (5463), a connecting guide (5464), an opening (5465), and a connecting pin (5466).

[0115] The frame body (5461) is rotatably coupled to the installation frame (520) and becomes the main body of the fastening operation.

[0116] The cover support (5462) is formed with a wide surface area at the end of the frame body (5461) and stably supports the back surface of the fastening elastic cover (530).

[0117] The cut section (5463) and the connecting guide (5464) form a sliding link structure to absorb the change in distance that occurs when converting the linear motion of the fastening module (545) into the rotational motion of the frame body (5461).

[0118] The opening (5465) and the connecting pin (5466) penetrate the module housing (5451) and are joined so that the forward force of the fastening module (545) is transmitted to the frame body (5461) without loss.

[0119] The fastening frame (546) having the configuration described above efficiently converts the linear motion of the fastening module into rotational pressure through a link structure, and has the effect of securely fixing the object to be printed while preventing damage to the fastening elastic cover (530) through smooth operation.

[0121] In one embodiment, the fastening elastic cover (530) is formed in the shape of a pouch that forms a sealed internal space in which a fluid is received, as shown in FIGS. 15 and 16.

[0122] The fastening elastic cover (530) is primarily supported by the fastening guide (540) and approaches the object to be printed, and then secondarily swells and expands as a fluid, such as air or oil, is supplied into the internal space. This is intended to maximize the fixing force by adhering tightly to the shape of the object without gaps through the uniform pressure distribution effect of the fluid, even when the surface of the object to be printed is curved or has irregularities.

[0123] The fastening elastic cover (530) having the configuration described above has the effect of significantly improving printing precision by using a combination of mechanical pressure and fluid expansion pressure to perfectly fix even irregularly shaped printing objects (e.g., smartphone cases, golf ball jigs, etc.) without shaking.

[0125] FIG. 17 is a diagram showing the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a second embodiment of the present invention.

[0126] Referring to FIG. 17, an ink sedimentation prevention UV printer (20) using a movable ink pack according to a second embodiment of the present invention includes a printing device body (100), a transfer unit (200), an ink discharge module (300), a movable ink source (400), and a damper (600).

[0127] Here, the printing device body (100), transfer unit (200), ink discharge module (300), and movable ink source (400) are identical to the components of FIG. 1, so their descriptions will be omitted to avoid duplication of descriptions.

[0128] First, the transfer unit (200) is a transfer means that moves back and forth at high speed along the guide rail or gantry system of the printing device body (100) on the printing area. The ink discharge module (300) is mounted on the transfer unit (200) and moves, and discharges UV-curable ink in the form of fine droplets onto a printing object below to create an image.

[0129] The movable ink source (400), which is the core component of this embodiment, is directly mounted to the transfer unit (200), unlike a conventional fixed ink tank. Accordingly, the movable ink source (400) moves together as a unit when the transfer unit (200) moves back and forth for printing. This structure transmits the inertia generated during the acceleration and deceleration of the transfer unit (200) into the ink pack. That is, when the carriage changes direction or stops, the ink sloshes and flows inside the pack, so the sedimentation phenomenon where high-density pigments (e.g., titanium dioxide in white ink) settle at the bottom can be physically prevented without a separate mechanical stirring device (stirrer).

[0130] However, when the movable ink source (400) moves at high speed together with the transfer unit (200), rapid flow occurs within the ink, which may cause changes in ink supply pressure or pulsation. If such pressure changes are transmitted directly to the nozzle surface of the ink discharge module (300), there is a risk that the ink may flow unintentionally or the discharge may become unstable.

[0131] To solve this, the present invention places a damper (600) between a movable ink source (400) and an ink discharge module (300). The damper (600) serves to dampen ink sloshing or pressure changes that may occur due to the movement of the movable ink source (400). The damper (600) maintains a constant ink supply pressure while storing a certain amount of ink inside, and prevents the phenomenon of instantaneous ink shortage when the ink discharge module (300) discharges ink at high speed.

[0132] The UV printer (20) using a movable ink pack according to the second embodiment of the present invention has the effect of preventing ink sedimentation without separate power through a movable ink source (400), and simultaneously resolving the instability of the supply pressure that may occur as a result through a damper, thereby minimizing the ink supply path while maintaining a high-quality, stable printing state.

[0134] FIG. 18 is a diagram showing the schematic configuration of an ink sedimentation prevention UV printer using a movable ink pack according to a third embodiment of the present invention.

[0135] Referring to FIG. 18, an ink sedimentation prevention UV printer (30) using a movable ink pack according to a third embodiment of the present invention includes a printing device body (100), a transfer unit (200), an ink discharge module (300), a movable ink source (400), and a connecting tube (700).

[0136] Here, the printing device body (100), transfer unit (200), ink discharge module (300), and movable ink source (400) are identical to the components of FIG. 1, so their descriptions will be omitted to avoid duplication of descriptions.

[0137] The transfer unit (200) is a transfer means that determines printing precision and moves back and forth at high speed across the printing area on the printing device body (100). The ink discharge module (300) is installed at the bottom of the transfer unit (200) and moves to precisely discharge ink onto the printing object.

[0138] In this embodiment, the movable ink source (400) has a structure that is directly mounted to the transfer unit (200). This means that the ink source moves together integrally with the transfer unit (200). Accordingly, the inertia generated when the transfer unit (200) moves left and right for printing is transmitted to the ink inside the ink pack, causing natural flow. This flow physically prevents the sedimentation phenomenon where pigments with high specific gravity, such as white ink, settle at the bottom, so that the ink concentration can be maintained uniformly without a separate complex stirring device.

[0139] In particular, the present invention implements a ‘straight ink line’ that minimizes the ink supply path by connecting a movable ink source (400) and an ink discharge module (300) through a connecting tube (700). Conventional UV printers had to connect a long tube to the head because the ink tank was fixed to one side of the main body, but the present invention can drastically reduce the length of the connecting tube (700) because the ink pack is located right next to the head (carriage).

[0140] The shortest distance arrangement of these connecting tubes (700) provides the following technical effects. First, it minimizes the time the ink remains inside the tube and eliminates stagnation sections, thereby fundamentally preventing ink sedimentation and nozzle clogging that are prone to occur in long tube lines. Second, as the tube length is shortened, pressure drop during ink transfer can be reduced, allowing stable discharge pressure to be maintained without ink starvation even during high-speed printing. Third, it prevents the tube from twisting or folding in the narrow space within the transfer unit (200), and by applying a chemical-resistant material, it prevents corrosion caused by UV ink and increases the convenience of maintenance.

[0141] The ink sedimentation prevention UV printer (30) using a movable ink pack according to the third embodiment of the present invention has the effect of miniaturizing the structure of the equipment and greatly improving the reliability of the print quality by simplifying and optimizing the ink supply path through the organic combination of a movable ink source (400) and a connecting tube (700).

[0143] FIG. 19 is a flowchart illustrating a method for controlling a UV printer that prevents ink sedimentation using a movable ink pack according to one embodiment of the present invention.

[0144] Referring to FIG. 19, a method for controlling an ink-preventing UV printer using a movable ink pack according to one embodiment of the present invention is a method for controlling an ink-preventing UV printer (10) using a movable ink pack as described above in FIG. 1, etc., and is performed by including an initial driving step (S100), an ink precipitation prevention step (S200), and an ink ejection step (S300).

[0145] First, the initial driving step (S100) is a step in which, upon receiving a print command, a control unit (not shown) controls a driving unit within the main body of the printing device (100) to drive the transfer unit (200). In this step, the transfer unit (200) does not simply move over the printing area, but performs reciprocating movement left and right while repeatedly accelerating and decelerating. This acceleration and deceleration movement provides the essential kinetic energy required to create the ink flow described later.

[0146] The ink sedimentation prevention step (S200) performed subsequently is a process that utilizes the physical force generated in the initial driving step (S100). When the transfer unit (200) changes direction or rapidly accelerates or decelerates, inertia is generated inside the movable ink source (400) which is directly mounted to the transfer unit (200) and moves together as a whole. Due to this inertia, the ink inside the movable ink source (400) undergoes a flow phenomenon in which it is pushed or swayes in the direction of movement. In this process, irregular vortices are formed inside the ink, causing pigments with high specific gravity (e.g., TiO2 in white ink) to continuously float without settling at the bottom. That is, this step achieves the effect of physically preventing ink sedimentation solely through the movement of the carriage, without driving a separate stirring motor or pump.

[0147] Finally, the ink ejection step (S300) is a step of performing actual printing when the ink concentration has become uniform. The control unit applies an ejection signal to the ink ejection module (300) in synchronization with the position information of the transfer unit (200). The ink ejection module (300) ejects ink in the form of fine droplets toward the object to be printed that is placed on the bed (500). At this time, since the ejected ink is in a state that has been sufficiently stirred through the previous ink sedimentation prevention step (S200), it can maintain a uniform concentration and color from the start to the end of printing.

[0148] A UV printer control method for preventing ink sedimentation using a movable ink pack according to one embodiment of the present invention having the configuration described above can maximize process efficiency and increase the convenience of equipment operation by utilizing the printing operation itself as an ink management (stirring) operation.

[0150] The embodiments described above are for illustrative purposes only, and those skilled in the art will understand that the embodiments described above can be easily modified into other specific forms without altering the technical concept or essential features of the embodiments described above. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0152] The scope of protection sought through this specification is defined by the claims set forth below rather than by the detailed description above, and should be interpreted to include all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents. Explanation of the symbols

[0154] 10, 20, 30: Ink Sedation Prevention UV Printer Using Removable Ink Packs 100: Printing device body 200: Transfer unit 300: Ink ejection module 400: Portable ink supply 500: Damper

Claims

Claim 1 A printing device main body for performing flatbed printing, including a bed on which a printing object is placed and a drive unit; a transfer unit installed to be reciprocally movable on a printing area by the drive unit of the printing device main body; an ink discharge module mounted on the transfer unit to discharge ink onto the printing object; and a movable ink source directly mounted on the transfer unit to move integrally together with the transfer unit during reciprocating movement to prevent ink sedimentation; wherein the bed comprises: a placement shelf forming a flat surface on which a printing object is placed; an installation frame installed on the upper side of the placement shelf so as to be arranged to surround the printing object placed inside; and a plurality of fastening elastic covers made of an elastic material capable of expansion and contraction, installed covering the inner surface of each side of the installation frame, and individually expanding or contracting before printing begins to fasten the printing object placed on the placement shelf so as not to move. and a plurality of fastening guides installed on the inner circumference of each side of the installation frame to support the fastening elastic cover and simultaneously adhere it to a printing object; wherein the fastening guides include: a drive shaft installed to be rotatable along the inner side of one side of the installation frame; a shaft rotation drive motor in which a drive shaft is installed by axial coupling on one side of the drive shaft to drive the drive shaft in a forward or reverse direction; a plurality of first bevel gears spaced apart at regular intervals along the shaft rotation drive motor; a plurality of second bevel gears connected and installed to mesh perpendicularly with the first bevel gears and rotate together as the first bevel gear rotates; and a plurality of fastening modules installed by axial coupling for each second bevel gear, which extend as the second bevel gear rotates in the forward direction and contract as the second bevel gear rotates in the reverse direction.A plurality of fastening frames, each having one end rotatably connected to the inner circumference of the installation frame and supporting the fastening elastic cover at the other end, and having a middle end connected to the fastening module, and rotating as the fastening module extends to push the fastening elastic cover and press it against a printing object; wherein the fastening module comprises: a module housing formed in a cylindrical tube shape; an inner nut formed in a cylindrical tube shape having an outer diameter corresponding to the inner diameter of the module housing, with screw threads formed along the inner circumference; a nut guide extended along the circumference of the inner nut; a guide groove extended along the inner circumference of the module housing so that the nut guide can be seated and moved; and a guide support spring installed at the front end of the guide groove while the inner nut is positioned along the inside, and which supports the nut guide by pressing it against the rear end of the guide groove. A UV printer with an ink sedimentation prevention using a movable ink pack, comprising: a drive bolt in which the rear end is installed by shaft coupling with the second bevel gear, the front end is connected by engaging with the inner nut and bolt-nut coupling, and rotates together with the second bevel gear as it rotates to simultaneously advance the inner nut and the module housing toward the fastening elastic cover. Claim 2 delete

Images