Mist spraying device and printing device

Abstract

To prevent paste from solidifying at a screen in a printing device and a mist spraying device.SOLUTION: A mist spraying device 1 sprays mist M to a screen S. The mist spraying device 1 includes a spraying part 10 for spraying mist M to a space A downward the screen S.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a mist spraying device for spraying mist onto a screen, and a printing device for performing printing on a printing object using paste supplied onto the screen.

Background Art

[0002] Conventionally, in a plate-making device for screen printing, on a screen held by a screen frame, for example, heat-sensitive perforation is performed on a printing portion by a thermal head. Alternatively, plate-making can also be performed by curing a chemical agent outside the printing portion of a mesh-shaped screen.

[0003] After plate-making of the screen, the user removes the screen frame from the plate-making device and attaches it to the printing device, and applies ink to the printing object through the holes of the screen using a squeegee (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By squeegeeing paste such as aqueous ink supplied onto the screen multiple times for printing, the bottom surface (for example, the film surface) side of the screen on the printing object side dries, causing image dropout. Such image dropout is caused, for example, by the paste that has entered the gaps of the yarn solidifying.

[0006] When the paste solidifies, in order to remove the dried paste, laborious operations such as wiping the bottom surface side of the screen with water occur.

[0007] The object of the present invention is to provide a mist spraying device and a printing device that can prevent the paste from solidifying on the screen. [Means for solving the problem]

[0008] In one embodiment, the mist spraying device is a mist spraying device that sprays mist onto a screen, and includes a spraying unit that sprays mist into the space below the screen. [Effects of the Invention]

[0009] According to the above embodiment, it is possible to prevent the paste from solidifying on the screen. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing a printing apparatus according to one embodiment. [Figure 2] This is a perspective view (part 1) showing a printing apparatus according to one embodiment (with the screen omitted). [Figure 3] This is a perspective view (part 2) showing a printing apparatus according to one embodiment (with the screen omitted). [Figure 4] This is a front view showing a printing apparatus according to one embodiment. [Figure 5] Figure 4 is a VV cross-sectional view. [Modes for carrying out the invention]

[0011] Hereinafter, a mist spraying apparatus and a printing apparatus according to one embodiment of the present invention will be described with reference to the drawings.

[0012] Figure 1 is a perspective view showing a printing apparatus 100 according to one embodiment.

[0013] Figures 2 and 3 are perspective views showing the printing apparatus 100 (with the screen S omitted).

[0014] FIG. 4 is a front view showing the printing apparatus 100, and FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4.

[0015] Note that the front-back, left-right, and up-down directions shown in FIGS. 1 to 5 are examples, and the front-back direction and the left-right direction are horizontal directions, and the up-down direction is a vertical direction.

[0016] The printing apparatus 100 shown in FIGS. 1 to 4 includes a mist spraying device 1, a pair of left and right holding portions 110, a printing table 120, a horizontal support column 130, and an inclined support column 140.

[0017] As shown in FIGS. 2 and 3, the mist spraying device 1 includes a spraying portion 10, a mist generator 20, a supply pipe 30, and a connecting portion 40.

[0018] The spraying portion 10 has an upstream pipe 11, a T-joint 12, two branch pipes 13, two L-joints 14, two discharge pipes 15, two angle adjustment levers 16, six pipe supports 17, and two drains 18.

[0019] The upstream pipe 11 is arranged to extend in the front-back direction, which is the longitudinal direction of the screen S, behind the printing table 120, and flows the mist M generated in the mist generator 20 described later and supplied through the supply pipe 30.

[0020] The T-joint 12 connects the upstream pipe 11 and two branch pipes 13 that flow the mist M in the left-right direction.

[0021] Each of the two L-joints 14 connects the branch pipe 13 and a discharge pipe 15 that flows the mist M in the front-back direction. Note that, as will be described later, the L-joint 14 rotatably holds the discharge pipe 15 so that the discharge pipe 15 can rotate about the front-back direction, which is the longitudinal direction.

[0022] As shown in Figure 4, the two discharge pipes 15 are positioned one below each of the left and right ends of the screen frame F, around the space A (shown as a dashed line in Figure 4) below the screen S attached to the bottom surface of the screen frame F. In other words, the spraying unit 10 has two discharge pipes 15, for example, facing each other, on either side of the space A below the screen S. The mist M sprayed from each discharge pipe 15 intersects approximately in the center of the space A below the screen S (approximately in the horizontal plane). The spraying unit 10 only needs to spray mist M into the space below the screen S, so there are no particular restrictions on the number or position of the discharge pipes 15. However, as shown in Figures 2 and 3, if the two discharge pipes 15 are positioned on both sides of the space A below the screen S, or if they extend along the longitudinal direction (front-to-back direction) of the screen frame F, the mist M tends to accumulate in space A. The screen S is attached to the bottom surface of the screen frame F, for example, and the printing area is prepared by thermally perforating the printing area with the thermal head of the printing plate making device, or by curing a chemical agent outside the printing area of ​​the mesh-like screen S.

[0023] As shown in Figures 2 and 3, each of the two discharge pipes 15 is provided with multiple discharge holes 15a (for example, seven) for spraying mist M into the space A below the screen S. As shown in Figure 5, the discharge holes 15a (the center in the direction of penetration is shown by a dashed line) are inclined at an angle θ in the opposite direction to the first direction D1 (forward), which is the direction in which mist M flows in the discharge pipe 15, with respect to the second direction D2 (see dotted arrow), which is perpendicular to the first direction D1. This prevents the mist M discharged from the discharge holes 15a from being discharged at an angle closer to the first direction D1 than to the second direction D2 due to the airflow in the first direction D1 within the discharge pipe 15, and instead discharges the mist M from the discharge holes 15a in a direction closer to the second direction D2. Note that the angle θ can be any angle greater than 0° and less than 90°, but 45° is one example.

[0024] As shown in Figure 4, each of the two angle adjustment levers 16 is integrally fixed to the discharge pipe 15 and extends from the discharge pipe 15 in a rod-like shape in the radial direction of the discharge pipe 15. Therefore, by manually rotating the angle adjustment lever 16, for example, the discharge pipe 15 rotates around the longitudinal direction, which is the front-to-back direction, and the spray angle of the discharge hole 15a with respect to the horizontal direction can be adjusted. The spray angle also varies depending on the orientation in which the discharge hole 15a is formed, but in particular, if the mist M tends to fall due to its own weight, it is preferable to discharge the mist M from the discharge hole 15a at an angle upward rather than horizontally.

[0025] Each of the six pipe supports 17 shown in Figures 2 and 3 (only the three on the left are shown in Figure 2) has a semi-cylindrical shape, and each of the two discharge pipes 15 is rotatably held by three pipe supports 17. The pipe supports 17 may be fixed to an immovable member, such as the base portion 111 of the holding portion 110, which will be described later.

[0026] The two drains 18 are located at the end of the discharge pipe 15 (the front end opposite the L-shaped joint 14) and discharge the mist M or its liquid flowing through the discharge pipe 15 downwards. Although not shown in the diagram, it is preferable to have a waste liquid receptacle located below the drains 18.

[0027] The mist generator 20 shown in Figures 1 to 3 generates mist M from, for example, water. Any device that generates mist M can be used as the mist generator 20, but if it is a heated humidifier, the mist M will become hot and affect the tension of the film of the screen S, so it is preferable to use, for example, an ultrasonic humidifier. The mist generator 20 may generate mist M continuously during squeegeeing, when changing the printing object, etc., or it may generate mist M intermittently only for a predetermined period of time. Note that if the spraying unit 10 itself functions as a mist generator, the mist generator 20 does not need to be located separately from the spraying unit 10.

[0028] The supply pipe 30 has an L-shape to direct the mist M supplied downward from the mist generator 20 forward. A flexible hose, for example (not shown), may be placed between the mist generator 20 and the supply pipe 30.

[0029] The connecting section 40 connects the supply pipe 30 and the spray section 10 (upstream pipe 11).

[0030] The two holding parts 110 hold the screen frame F to which the screen S (see Figure 1) is attached. For example, one holding part 110 holds the left end of the screen frame F, and the other holding part 110 holds the right end of the screen frame F.

[0031] Each of the two retaining parts 110 has a base part 111, a retaining member 112, and a retaining screw 113.

[0032] The base portion 111 is a sheet metal plate that has a horizontal shape, opening toward the screen frame F, by having an upper horizontal portion 111a, a vertical portion 111b, and a lower horizontal portion 111c (see Figure 4) arranged in a continuous manner. In addition, a bulge portion 111d is provided at the upper part of the upper horizontal portion 111a.

[0033] The retaining member 112 moves up and down as the retaining screw 113, which is inserted from the top of the bulging portion 111d, is screwed into it, and the retaining member 112 moves up and down in conjunction with the rotation of the retaining screw 113. The retaining member 112 presses down on the screen frame F, which is placed on the lower horizontal portion 111c, at the horizontal portion of the bottom surface. As a result, the screen frame F is held between the retaining member 112 and the lower horizontal portion 111c.

[0034] The configuration of the holding part 110 is arbitrary; the holding part 110 only needs to hold the screen frame F to which the screen S is attached.

[0035] The printing platform 120 is on which the object to be printed, such as a garment, is placed. For example, if the object to be printed is a T-shirt, the T-shirt is positioned in the printing device 100 such that the printing platform 120, together with the horizontal support column 130 (described later), is located inside the T-shirt.

[0036] The horizontal support column 130 is fixed to the underside of the printing table 120 at one end, the front end, and extends horizontally backward at the other end.

[0037] The diagonal support column 140 is fixed to the underside of the printing table 120 at one end, the front end, and the other end extends diagonally downward and backward.

[0038] Here, the mist spraying device 1 is not limited to one placed in the printing device 100 for printing on an object using paste supplied onto a screen S, but can be any device equipped with a spraying unit 10 that sprays mist M into the space A below any screen S. The printing table 120, horizontal support 130, and diagonal support 140 are arranged in multiple sets (for example, 8 sets) in the printing device 100, with each set forming a unit. For example, these sets rotate around a central point (not shown) extending vertically from the printing device 100 as the center of rotation, and are arranged at equal intervals in the direction of rotation. On the other hand, the mist spraying device 1, the holding unit 110, and the screen frame F do not rotate, and the object to be printed on the printing table 120 rotates sequentially below each of the multiple screen frames F, and screen printing is performed using, for example, water-based ink (an example of paste) supplied in a different color for each screen frame F. When screen printing is performed, the paste supplied to the screen S automatically or manually is squeegeeed, for example, by a squeegee while the screen S is automatically or manually pressed downwards, and applied to the object to be printed through the printing area (plate-making area), which is the opening of the screen S.

[0039] In the embodiment described above, the mist spraying device 1 is a mist spraying device 1 that sprays mist M onto a screen S, and includes a spraying unit 10 that sprays mist M into the space A below the screen S.

[0040] In this way, since the spraying unit 10 sprays mist M into the space A below the screen S, it is possible to suppress the drying of pastes such as water-based inks on the bottom surface (e.g., the film surface) of the screen S. Therefore, according to this embodiment, it is possible to prevent the paste from solidifying on the screen S.

[0041] In this embodiment, the mist spraying device 1 is positioned within a printing device 100 that prints on an object using paste supplied onto a screen S.

[0042] Furthermore, in this embodiment, the printing apparatus 100 is a printing apparatus 100 for printing on an object to be printed using paste supplied onto a screen S, and comprises a holding part 110 for holding a screen frame F to which the screen S is attached, and a mist spraying apparatus 1 which includes a spraying part 10 for spraying mist M into the space A below the screen S.

[0043] In these mist spraying devices 1 and printing devices 100, the spraying unit 10 sprays mist M into the space A below the screen S, which prevents the paste, such as water-based ink, from drying out on the bottom surface of the screen S on the printing target side while multiple prints are being made. This prevents the loss of images in screen printing caused by the hardening of the paste. Furthermore, since the hardening of the paste on the screen S can be prevented, time-consuming tasks such as wiping the bottom surface of the screen S with water to remove dried paste can be omitted.

[0044] Furthermore, in this embodiment, the spray unit 10 (discharge pipe 15) is arranged around the space A below the screen S, and the spray angle with respect to the horizontal direction can be adjusted.

[0045] This allows the spray angle of the mist M to be adjusted according to factors such as the position and size of the screen frame F, and the position and size of the printing area to be prepared on the screen S. As a result, the hardening of the paste on the screen S can be prevented even more effectively.

[0046] Furthermore, in this embodiment, the spray unit 10 has a discharge pipe 15 provided with a discharge hole 15a for discharging mist M, and the discharge hole 15a is inclined in the opposite direction to the first direction D1 with respect to a second direction D2 which is perpendicular to the first direction D1 through which the mist M flows in the discharge pipe 15.

[0047] As a result, the mist M discharged from the discharge hole 15a is prevented from being discharged at an angle towards the first direction D1 rather than the second direction D2 due to the airflow in the first direction D1 within the discharge pipe 15, and the mist M can be discharged from the discharge hole 15a in a direction closer to the second direction D2. Therefore, the mist M can be more easily retained in the space A below the screen S, thereby further preventing the paste from solidifying on the screen S.

[0048] In this embodiment, the spray unit 10 has a discharge pipe 15 with a discharge hole 15a for discharging mist M, and the spray unit 10 has two discharge pipes 15 on either side of the space A below the screen S. The mist M sprayed from each discharge pipe 15 intersects in the space A below the screen S.

[0049] This ensures that the mist M sprayed from the discharge pipe 15 is effectively utilized without flowing away, effectively preventing the paste from solidifying on the screen S. In contrast, if the discharge pipe 15 were located on only one side of the space A below the screen S, the sprayed mist M would flow through the space A below the screen S, reducing the utilization efficiency of the sprayed mist M.

[0050] It should be noted that the present invention is not limited to the embodiments described above, and the components can be modified and implemented in practice without departing from the spirit of the invention. Furthermore, various inventions can be formed by appropriately combining the multiple components disclosed in the embodiments described above. For example, all the components shown in the embodiments may be combined as appropriate. It goes without saying that various modifications and applications are possible without departing from the spirit of the invention. The invention described in the original claims of this application is listed below.

[0051] [Note 1] A mist spraying device that sprays mist onto a screen, The system includes a spray unit that sprays mist into the space below the screen. A mist spraying device characterized by the following:

[0052] [Note 2] The mist spraying device is positioned in a printing apparatus for printing on an object using paste supplied onto the screen. The mist spraying device according to Appendix 1, characterized by the features described above.

[0053] [Note 3] The spraying unit is positioned around the space below the screen and is adjustable in its spraying angle relative to the horizontal direction. A mist spraying device as described in Appendix 1 or 2, characterized by the above.

[0054] [Note 4] The spraying unit has a discharge pipe provided with a discharge hole for discharging mist, The discharge hole is inclined in a direction opposite to the first direction with respect to a second direction which is perpendicular to the first direction through which the mist flows in the discharge pipe. A mist spraying device as described in Appendix 1 or 2, characterized by the above.

[0055] [Note 5] The spraying unit has a discharge pipe provided with a discharge hole for discharging mist, The mist spraying device according to Appendix 1 or 2, characterized in that the spraying section has two discharge pipes flanking the space below the screen, and the mist sprayed from each discharge pipe intersects in the space below the screen.

[0056] [Note 6] A printing apparatus for printing on an object using paste supplied onto a screen, A holding part that holds the screen frame to which the screen is attached, A mist spraying device comprising a spraying unit that sprays mist into the space below the screen, A printing apparatus characterized by being equipped with the following features. [Explanation of Symbols]

[0057] 1. Mist spraying device 10 Spray part 11 Upstream pipe 12 T-joints 13 Branch pipes 14 L-shaped joint 15 Discharge pipe 15a Discharge hole 16 Angle adjustment lever 17 Pipe support 18 Drain 20 Mist Generator 30 supply pipes 40 Connection part 100 Printing equipment 110 Holding part 111 Base section 111a Upper horizontal section 111b Vertical section 111c Lower horizontal section 111d bulge 112 Retaining member 113 Retaining screw 120 printing presses 130 horizontal support 140 Diagonal support poles Space A D1 1st direction D2 2nd direction F Screen Frame M Mist S Screen

Claims

1. A mist spraying device that sprays mist onto a screen, The screen is equipped with a spraying unit that sprays mist into the space below the screen, The spraying unit has a discharge pipe provided with a discharge hole for discharging mist, The discharge hole is inclined in a direction opposite to the first direction with respect to a second direction which is perpendicular to the first direction through which the mist flows in the discharge pipe. A mist spraying device characterized by the following:

2. The mist spraying device is positioned in a printing apparatus for printing on an object using paste supplied onto the screen. The mist spraying device according to claim 1, characterized by its features.

3. The spraying unit is positioned around the space below the screen and is adjustable in its spraying angle relative to the horizontal direction. The mist spraying device according to claim 1 or 2, characterized by the above.

4. The mist spraying device according to claim 1 or 2, characterized in that the spraying section has two discharge pipes flanking the space below the screen, and the mist sprayed from each discharge pipe intersects in the space below the screen.

5. A printing apparatus for printing on an object using paste supplied onto a screen, A holding part that holds the screen frame to which the screen is attached, A mist spraying device comprising a spraying unit that sprays mist into the space below the screen, Equipped with, The spraying unit has a discharge pipe provided with a discharge hole for discharging mist, The discharge hole is inclined in a direction opposite to the first direction with respect to a second direction which is perpendicular to the first direction through which the mist flows in the discharge pipe. A printing apparatus characterized by the following features.

Images