KR20030012319A - Screen printing apparatus - Google Patents

Abstract

PURPOSE: A screen printer is provided to prevent the screen mask from deviating and ink spots and stains by moving the single squeegee unidirectionally, and to prevent oxidation of ink by supplying ink quickly with arranging the ink supplier in the scraping drum. CONSTITUTION: Both ends of an ink scraping drum(1) are closed, and the lower part of the ink scraping drum is opened partially. A shaft(2) is inserted to the center of the ink scraping drum, and the drum is rotated freely against the shaft. The ink scraping drum reciprocates according to moving direction of the shaft, moves down at the starting point and up at the end point, and reverses at the starting point and the end point. A squeegee holder(4) is inclined in the ink scraping drum, and moved up and down. A squeegee(10) and an ink push plate(11) are installed in the lower part of the squeegee holder, and nitrogen gas is charged in the ink scraping drum.

Description

Screen printing machine {SCREEN PRINTING APPARATUS}

The present invention relates to a screen printing machine.

A screen printing machine moves a squeegee along the upper surface of a screen mask, and makes it print by making it into a to-be-printed board, such as a printer substrate, through the through-hole formed in the screen mask, such as cream solder which was carried on the screen mask.

In addition, the screen mask has a holding member made of a slightly elastic material such as Tetron in the mold and is kept in a taut state.

In addition, in the conventional screen printing machine, two squeegees are used to alternately move them in opposite directions to print.

As a result, the screen mask is repeatedly pushed in the opposite direction, and the elasticity of the holding member does not become uniform when used for a long time. As a result, the position of the screen mask is shifted. This also made it difficult to accurately print on the pattern of the printed board which is the printed board or to cause stains on the coating amount of the printing agent.

In addition, a printing agent such as a cream solder causes problems such as poor quality as well as hardening when being oxidized in contact with air, making it hard to escape from the through-hole of the screen mask.

In view of the above problems, the present invention not only prints by moving in one direction by a single squeegee, but also prevents oxidation of the printing agent as much as possible, thereby eliminating all of the above problems. It is to provide a screen printing machine.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the state in printing of the main part of 1st Embodiment of this invention.

Fig. 2 is a side view of the state at the end of printing of the main portion of the first embodiment of the present invention.

Fig. 3 is an explanatory diagram at the time of supplying the printing agent of the main part of the first embodiment of the present invention.

4 is a front view of the main portion, with a part of the first embodiment of the present invention omitted.

5 is a plan view of the main portion, with a part of the first embodiment of the present invention being omitted.

Fig. 6 is a side view of the state during printing of the main portion of the second embodiment of the present invention.

Fig. 7 is a side view of the state at the end of printing of the main portion of the second embodiment of the present invention.

8 is a side view of a state in which the squeegee holder is raised after completion of printing of the main portion of the second embodiment of the present invention.

* Code Description *

1 Printing Machine Scraping Drum 2 Axis

4 Squeegee Holder 5 Squeegee Holder Support Plate

10 Squeegee 11 Printing Agent Extrusion Plate

12 Printing Agent Supply Unit 17 Nitrogen Gas

18 Nitrogen Gas Inlet Port 19

Therefore, the main part of the present invention is to penetrate the support shaft in the center and to freely rotate the support shaft, and to reciprocate according to the movement direction of the squeegee through the support shaft movement. A printing scraper drum partially open at the lower end, which not only descends from the start position, but also rises from the end position, and rotates at a predetermined angle in a direction opposite to a predetermined timing at the start position and the end position; And a squeegee holder which is arranged to have a predetermined angle in the drum and is elevated at a predetermined timing, and a squeegee attached to the lower end of the squeegee holder and a printing extruder plate positioned in the advancing direction of the squeegee. It is a screen printing machine.

Moreover, in the said structure, you may block the both ends of a printing agent scraping drum. Thereby, the sealing property of a printing agent scraping drum can be improved, and the antioxidant effect of a printing agent can be improved.

In addition, when the both ends of the printing scraper drum are closed as mentioned above to improve the sealing property, nitrogen gas may be injected into the printing scraper drum. In this case, the antioxidant effect of a printing agent can be improved further. Especially when the printing agent is tin or copper, the effect is much better.

In the above configuration, the printing agent supplying device may be arranged in the printing scraping drum. Thereby, printing agent can be supplied quickly in the sealed printing agent scraping drum. Therefore, the antioxidant effect of a printing agent can be heightened further.

In addition, by combining the above configuration, through the support shaft in the center of the penetrating and free rotational movement with respect to the support shaft, the reciprocating movement along the direction of movement of the squeegee through the movement of the support shaft, at the starting position of the movement A printing scraper drum with a partially opened lower end, and a predetermined angle in the printing scraper drum which not only descend but also rise from the end position and rotate at a predetermined angle in the opposite direction at a predetermined timing at the start position and the end position. It consists of a squeegee holder which is arranged to have an inclination of the squeegee and moves up and down at a predetermined timing, and a squeegee attached to the lower end of the squeegee holder and a printing agent pushing plate positioned in front of the squeegee's traveling direction. The nitrogen gas into the printing scraping drum at the same time as the A screen printing machine having a printing agent supply device is configured, and a vertical plate on which the back surface of the squeegee slides is attached to the front surface of the printing agent supply device, and a screen mask is provided at the bottom bottom of the plate. An end portion for forming a gap into which one end of the lower portion of the printing scraping drum enters deeply is provided in the printing material, which further reduces the lower opening of the printing scraping drum, and at the time of printing, While the end is in a position including a portion of the printing material between the squeegee and the printing material pushing plate, the end of the opposite side of the lower opening is allowed to go deep into the gap between the plate and the screen mask, and at the end of printing One end of the lower opening is in a position where the end is in contact with the plate, while an end of the opposite side is between the plate and the screen mask. But may be let inside. Thereby, the sealing property of a printing material scraping drum can be improved much more, and the antioxidation effect by nitrogen gas can be improved much.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

1 is a side view of a state at the time of printing of the main part of the first embodiment of the present invention, FIG. 2 is a side view of a state at the end of printing of the main part, FIG. 3 is an explanatory diagram at the time of supplying the printing agent of the main part, and FIG. 5 is a plan view showing the main portion partially omitted.

1 is a printing material scraping drum which partially opened the lower end part. On the other hand, 1a is its open portion. In addition, the edge part 1a 'of the squeegee in the advancing direction side of the opening part 1a becomes a blade shape so that it may be easy to scratch. In addition, both ends of the printing scratching drum 1 are blocked.

Moreover, the printing scraping drum 1 penetrates the support shaft 2 in the center, and the rotational movement is free with respect to the support shaft 2. A gear 3 is attached to an end of one side of the printing scraping drum 1, and meshes with a gear wheel fixed to a rotating shaft of a reversible motor attached to a support device (not shown). .

In addition, the support shaft 2 is supported by a supporting device (not shown), and can be reciprocated along a guide member (not shown), and can be elevated at an appropriate timing through a lifting device such as a cylinder.

Then, the printing scraping drum 1 reciprocates along the moving direction of the squeegee through the movement of the support shaft 2, and not only descends from the start position of the movement but also rises from the end position. Then, at the start position and the end position, the reversible motor is driven to rotate a predetermined angle in the opposite direction at a predetermined timing.

4 is a squeegee holder which is disposed at an inclined angle at a predetermined angle in the printing scraping drum 1 and is moved up and down at a predetermined timing.

5 is a squeegee holder support plate. In addition, the squeegee holder support plate 5 is installed vertically with the guide posts 7 and 7 mounted on the support plates 6 and 6, which are installed so as to spread horizontally at appropriately spaced positions in the axial direction of the support shaft 2, respectively. The lifting and lowering is performed by attaching the guide sleeves 8 and 8 fitted to the guide posts 7 and 7 so as to slide freely.

The squeegee holder support plate 5 is fixed to the piston rods of the cylinders 9 and 9 fixedly attached to the support plates 6 and 6 so that the squeegee holder support plate 5 can be lifted at an appropriate timing.

10 is a squeegee attached to the lower end of the squeegee holder 4. In addition, the surface on the opposite side to the advancing direction of the squeegee 10 is cut | disconnected perpendicularly.

11 is a printing material pushing plate attached to the front of the advancing direction of the squeegee 10 of the lower end part of the squeegee holder 4. The printing extruder plate 11 is also at an angle perpendicular to or slightly smaller than the squeegee 10.

12 is a printing agent supply device arranged in the printing scraping drum 1. Moreover, the printing agent supply apparatus 12 is located in the opposite side to the advancing direction of the squeegee 10, and makes the back surface of the squeegee 10 slide by making the front-end surface vertical. The gap S between the front end of the printing agent supply device and the screen mask is determined in consideration of the thickness of the printing scraping drum 1 and the bending of the tip when the squeegee 10 is moved. have.

13 is a support plate of a supply apparatus, and is provided so as to spread horizontally at a position between the support plates 6 and 6 of the support shaft 2. Reference numeral 14 is a screw for connecting the support plate 13 and the printing agent supply device. In other drawings, 15 represents a printing agent and 16 represents a screen mask.

Next, the operation of the present embodiment will be described.

In the starting position, the printing scraping drum 1 is lowered. Then, the squeegee 10 and the printing material pushing plate 11 are lowered from the lower opening 1a of the printing material scraping drum 1, and in synchronism with this, the printing material scraping drum 1 Rotate to avoid disturbing this. As a result, the squeegee 10 comes into contact with the screen mask 16, and the printing agent 15 is loaded in the forward direction of the squeegee.

In this state, as shown in FIG. 1, the squeegee 10 moves on the screen mask 16 while pushing the printing agent 15. When the squeegee 10 reaches the end position of movement, as shown in Fig. 2, the squeegee 10 and the printing agent pushing plate 11 are raised, and in synchronization with this, the printing agent scraping drum 1 is placed on the screen mask. Rotate in the direction of scratching the printing material.

Thereby, the printing agent is in the printing scraping drum 1, and the printing scraping drum 1, the squeegee 10, the printing ejection plate 11, and the front surface of the printing material supply device 12 are separated. It is kept in the space between. Therefore, the contact of the printing agent with air can be reduced, and the oxidation can be prevented as much as possible. In addition, since the squeegee 10 also moves only in one direction, the force pushing in the opposite direction as in the prior art is not added.

Next, in this state, the printing material scraping drum 1 is raised and returns to the movement start position. Then, the printing scraping drum 1 is lowered again to operate the start position.

In addition, when the quantity of printing agent decreases, it is replenished by the printing agent supply apparatus 12, but at this time, the squeegee 10 and the printing agent extrusion board 11 are raised slightly from the state of FIG. Inject the liver. On the other hand, the timing for replenishing the printing agent is preferably calculated by calculating the number of movements of the squeegee every predetermined number of times or by detecting the remaining amount of the printing agent by a sensor, and this may be appropriately selected.

Next, a second embodiment of the present invention shown in Figs. 6 to 8 will be described.

Fig. 6 is a side view of the main part during printing, Fig. 7 is a side view of the main part at the end of printing, and Fig. 8 is a side view of a state where the squeegee holder is raised after the main part is finished printing.

The difference between the present embodiment and the first embodiment lies in that the nitrogen gas for preventing oxidation of the printing agent is injected into the printing agent scraping drum in the present embodiment.

In addition, the other structure and operation are the same as that of 1st Embodiment, the same code | symbol is attached | subjected to the same member, and detailed description is abbreviate | omitted.

And in this embodiment, the injection port 18 for injecting nitrogen gas 17 is provided in the edge surface of the printing material scraping drum 1.

Moreover, the vertical plate 19 which the back surface of the squeegee 10 slides is attached to the front surface of the printing agent supply apparatus 12, and the screen mask 16 is provided in the lower end part of the back surface of the plate 19 between them. The end part 20 for forming the clearance gap S 'which the one end of the printing agent scraping drum 1 lower end opening part 1a deeply enters is provided.

And the lower end opening part 1a of the printing material scraping drum 1 is made as small as possible, and at the time of printing, the edge part 1a 'of the squeegee's advancing direction side of the lower end opening part 1a is squeegee 10 and the other. The end of the opposite side of the lower opening 1a is in the gap between the plate 19 and the screen mask 16 while in the position including a part of the printing agent 15 between the printing agent pushing plate 11. I'm in a position to go deep into the S '. At the end of printing, the end 1a 'on one side is in contact with the plate 19, and the end on the other side is in the gap S'. Thereby, the sealing property of the printing material scraping drum 1 further improves.

Since the present invention prints only by movement in one direction by a single squeegee with the above-described configuration and operation, the force pushing in the opposite direction to the screen mask as in the prior art is not repeatedly added. Therefore, the position of a screen mask may shift | deviate and the application | coating stain of a printing agent can be prevented.

At the same time, the oxidation of the printing agent can be prevented to a minimum.

In addition, when the both ends of the printing material scraping drum are closed, its sealing property can be improved, and the antioxidant effect of the printing material can be improved.

In addition, in the case where both ends of the printing scraping drum are closed to increase the sealing property, when nitrogen gas is injected into the printing scraping drum, the antioxidant effect can be further improved. Especially when the printing agent is tin or copper, a noticeable effect is seen.

In addition, when the printing agent supply device is disposed in the printing scraper drum, the supply of the printing agent can be performed more quickly in the sealed printing scraper drum. Therefore, the antioxidant effect of the printing agent can be much enhanced.

Claims (5)

The penetrating shaft is inserted into the center and freely rotates with respect to the shaft. The shaft is reciprocated along the moving direction of the late squeegee through the movement of the supporting shaft, and descends from the starting position. A printing material scraping drum partially open at the lower end, which is raised at the end position and further rotates at a predetermined angle in the opposite direction at a predetermined timing at the start position and the end position; A squeegee holder which is disposed at the printing scraping drum at an angle at a predetermined angle and ascends at a predetermined timing; and And a squeegee attached to the lower end of the squeegee holder and a printing agent pushing plate positioned in front of the advancing direction of the squeegee. The method of claim 1, Screen printing machine which is made by blocking both ends of printing agent scraping drum. The method of claim 2, Printing Scratches Screen printing machines that allow nitrogen gas to be injected into the drum. The method of claim 1, 2 or 3, Screen printing machine for placing a printing agent supply in a printing scraping drum. At the same time, the shaft is inserted into the center and the rotational movement is freed with respect to the shaft, and the shaft moves by the support device to reciprocate along the direction of the late squeegee, and not only descends from the starting position of the movement but also ends. A printing scraping drum partially opened at the lower end, which rises in the position and rotates at a predetermined angle in the opposite direction at a predetermined timing at the start position and the end position; A squeegee holder which is disposed at the printing scraping drum at an angle at a predetermined angle and ascends at a predetermined timing; and It consists of a squeegee attached to the lower end of the squeegee holder and a printing material extrusion plate located in front of the traveling direction of the squeegee, The screen printing machine according to claim 4, wherein the printing agent supplying device is arranged while closing both ends of the printing agent scraping drum. Attaching a vertical plate on which the back of the squeegee is slid to the front of the printing material supply device, and at the bottom of the back of the plate, forming a gap in which one end of the lower part of the printing drum scraping opening deeply enters between the screen mask. By installing an end for the lower end of the printing scraping drum, At the time of printing, the edge part of the lower side opening part of the squeegee in the traveling direction is in a position including a part of the printing agent between the squeegee and the printing agent pushing plate, While the end on the opposite side of the lower opening is in a position deep into the gap between the plate and the screen mask, at the end of printing, the end on one side of the lower opening is in contact with the plate, A screen printing machine, wherein the opposite end is within the gap between the plate and the screen mask.