JPH06191010A - Attached-ink removing apparatus for squeegee and doctor in screen printing machine - Google Patents

Abstract

PURPOSE:To improve the circulation and flowing of ink and to perform excellent printing by making it possible to move a squeegee and a doctor relatively with a driving means, setting a remote printing position and a close ink removing position, lowering the doctor at the ink removing position, and bringing a removing part, provided at a blade close to the squeegee. CONSTITUTION:At the end of printing, a squeegee 15 is moved up and inclined from a printing position Q. The squeegee a doctor 17 and takes an ink removing position P. Under this state, a removing part 45a of a blade 45 of an ink removing plate 43, which is attached to a supporting plate 41 of the doctor 17, comes into contact with the upper part of the side surface of a squeegee rubber 40. The ink attached on the side surface of the squeegee rubber 40 is covered with a ceiling surface 45b of the blade 45. When the doctor 17 is moved downward, the removing part 45a of the blade 45 is lowered along the side surface under the state wherein the removing part 45a of the blade 45 is in contact with the side surface of the squeegee rubber 40. The ink attached to the squeegee rubber 40 is removed with the blade 45. Thereafter, the squeegee 15 is inclined from the ink removing position P to the printing position Q.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for scraping off ink adhering to a squeegee or a doctor in a screen printing machine.

[0002]

2. Description of the Related Art In a conventional screen printing machine, for example, as shown in JP-A-61-270159, a squeegee presses a plate surface coated with ink by a doctor to perform printing.

[0003]

However, particularly high-viscosity ink adheres to the squeegee or doctor little by little as the squeegee or doctor slides on the plate surface, and if left unattended, it may rise up on the squeegee or doctor. there were. Such swelling of the ink adversely affects the functions of the squeegee and the doctor, and causes printing defects.

It is an object of the present invention to provide a device for scraping off ink adhering to a squeegee or a doctor so as to perform good printing.

[0005]

The drawings of the first embodiment (FIGS. 1 to 8), the drawings of the second embodiment (FIGS. 9 to 11), and the drawings of the third embodiment (FIGS. 12 to 12) which will be described later. 14) and the drawings of the fourth embodiment (FIGS. 15 to 17),
In the screen printing machine according to the present invention, the squeegee 15 and the doctor 17 are supported above the plate surface 4 by the driving means 6 so as to be capable of reciprocating in the front-rear direction A along the plate surface 4 and arranged on both front and rear sides along the moving direction. The squeegee 15 and the doctor 17 are installed in the drive means 8,
It is supported by 9 so as to be able to reciprocate in the up-and-down direction B approaching and separating from the plate surface 4, and can come into contact with the plate surface 4.

Further, the squeegee 15 and the doctor 17
Are movable relative to each other by the drive means 25, and the printing positions Q are separated from each other and the ink scraping positions P are close to each other.
And can be taken. At the ink scraping position P, as the squeegee 15 and the doctor 17 move up and down,
Scraping portions 45a and 46 capable of contacting at least one of the squeegee 15 and the doctor 17 are provided.

For example, as shown in the first embodiment, a blade 45 is attached to the doctor 17, and the blade 45 is provided with a scraping portion 45a for scraping off the ink adhering to the squeegee 15.

Further, as shown in the second embodiment, for example, a blade 45 is attached to the squeegee 15, and the blade 4
5 is provided with a scraping portion 45a for scraping off the ink adhering to the doctor 17.

Further, for example, as shown in the fourth embodiment,
A blade 45 separated from them is provided between the squeegee 15 and the doctor 17, and the blade 45 is supported together with the squeegee 15 and the doctor 17 so as to be capable of reciprocating in the front-rear direction A along the plate surface 4. This blade 45
Is provided with a scraping portion 45a that comes into contact with the squeegee 15 and the doctor 17 as they move up and down and scrapes off the ink.

Each of the blades 45 is provided with a ceiling surface 45b facing the plate surface 4.

[0011]

During the ink scraping printing cycle, the ink adhered to the squeegee 15 and the doctor 17 is scraped off by the scraping portions 45a and 46 while the squeegee 15 and the doctor 17 are in the ink scraping position P. In this case, the ceiling surface 45b of the blade 45 ensures that the ink is scraped off without escaping upward.

[0012]

First Embodiment First, an ink scraping device for a screen printing machine according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7.

As schematically shown in FIG. 1, a printing sheet 2 is positioned on a vacuum table 1, and a plate frame 3 is placed on the vacuum table 1 to form a plate surface 4 thereof.
Are superposed on the printing paper 2.

Both left and right traveling frames 5 are installed above the vacuum table 1, and a drive belt 6 is stretched around them. A carriage 7 is attached to each of the drive belts 6. A squeegee up / down cylinder 8 and a doctor up / down cylinder 9 are attached to the two carriages 7 so as to be arranged front and back outside the inner walls of the two traveling frames 5 facing each other, and their piston rods 8a and 9a are attached. Protruding towards.

As shown in FIGS. 2 and 3, the squeegee support mechanism 10 is attached to the piston rods 8a of the right and left squeegee up / down cylinders 8 located on the front side, and the squeegee bar 11 is supported between the both support mechanisms 10. . On the other hand, as shown in FIGS. 2 and 4, the doctor support mechanism 12 is attached to the piston rods 9a of the left and right doctor up-and-down cylinders 9, and the doctor bar 13 is supported between the support mechanisms 12. There is. A squeegee holder 14 is fixed to the squeegee bar 11, and a squeegee 15 is attached to the holder 14. Meanwhile, Doctor Bar 1
Doctor holder 16 is fixed to 3 and this holder 1
A doctor 17 is attached to 6. Above the plate surface 4, the squeegee bar 11 and the squeegee 5 are arranged in front of the doctor bar 13 and the doctor 17.

When the left and right drive belts 6 rotate, the left and right carriages 7 and the cylinders 8 and 9 between them, the mechanisms 10 and 12, the bars 11 and 13, the holders 14 and 16, and the squeegee 15 are arranged. The doctor 17 and the doctor 17 reciprocate in the front-rear direction A along the plate surface 4.

When the piston rods 8a of the right and left squeegee up / down cylinders 8 advance and retreat, the left and right squeegee support mechanisms 10 and the squeegee bar 11, squeegee holder 14 and squeegee 15 between them are integrated with the plate surface 4. It reciprocates in the vertical direction B orthogonal to each other. On the other hand, when the piston rods 9a of the left and right doctor up / down cylinders 9 advance and retreat, the left and right doctor support mechanisms 12 and the doctor bar 13, the doctor holder 16, and the doctor 1 between them.
7 and 7 integrally move back and forth in the vertical direction B.

It should be noted that vertical adjustment knobs 18 and 19 are attached to the upper ends of the squeegee vertical cylinders 8 and the doctor vertical cylinders 9, respectively. When the knobs 18 and 19 are operated, the vertical positions of the piston rods 8a and 9a are finely adjusted. This fine adjustment position can be read by the hands 20 and 21.

The squeegee support mechanism 10 will be described in detail. A connecting block 22 is attached to the piston rod 8a of the squeegee up / down cylinder 8, and a housing 23 is attached to the connecting block 22 by a connecting pin 24 so as to be able to move slightly with respect to the connecting block 22.
A squeegee tilting rotary solenoid 25 is attached to the housing 23 by a fixing plate 26. Rotating shaft 2 extending from this rotary solenoid 25
7 is supported by the ball bearing 28 with respect to the housing 23. The rotary shaft 27 projects from the housing 23, and the rotary plate 29 is attached to the projecting portion 27a. This rotation plate 29 is a rotation shaft 27.
The plate 29 is integrally rotatable and extends upward from the rotary shaft 27 so as to face the housing 23. As shown in FIG. 5A, an elongated hole 30 is formed at the upper end of the plate 29 along the rotational direction. Is formed so as to extend. The squeegee bar 1
A connecting plate 31 is fixed to one end portion of the rotary shaft 27, and the connecting plate 31 is rotatably supported in the same direction as the shaft 27 on a support pin 32 fixed to the protruding portion 27a of the rotating shaft 27. . The connecting plate 31 extends upward along the rotating plate 29, and a squeegee angle adjusting clamp lever 34 is screwed onto the rotating plate 29 through an elongated hole 33 in the extending portion. When the clamp lever 34 is tightened, the connecting plate 1 is locked by the rotating plate 29 and they rotate integrally. When the clamp lever 34 is loosened, the connecting plate 31 can rotate with respect to the rotating plate 29. An ink scraping position stopper pin 35 is fixed to the extended portion of the connecting plate 31. As shown in FIG. 5B, a long hole 36 is formed in the housing 23 along the long hole 30 of the rotating plate 29. The stopper pin 35 on the connecting plate 31 is inserted into the long hole 36 of the housing 23 through the long hole 30 of the rotating plate 29. A printing position stopper pin 37 is attached to the housing 23, and the rotating plate 29 contacts the stopper pin 37. An adjustment screw 38 for the ink scraping position is screwed into the housing 23 and inserted into the elongated hole 36, and a stopper pin 35 on the connecting plate 31 abuts on the adjustment screw 38.

In the squeegee 15, the squeegee plate 39 is attached to the squeegee holder 14, and the squeegee rubber 40 is inserted into the squeegee plate 39 and faces the plate surface 4. On the other hand, the doctor 17 has a support plate 41 and an ink return plate 42, and the support plate 41 is attached to the doctor holder 16 so that the holder 16
To the plate surface 4 and the squeegee 15 side. The ink return plate 42 is bent at the lower end of the support plate 41 and extends at a right angle to the plate surface 4.

In particular, in this embodiment, the ink scraping plate 43 is attached to the supporting plate 41 of the doctor 17 by the fixing screw 44. The ink scraping plate 43 has a blade 45. This blade 45 is an ink return plate 4
The second top portion 42a is bent toward the squeegee 15 side and extends at a right angle to the ink return plate 42, that is, parallel to the plate surface 4. A scraping portion 45a is formed at the tip of the blade 45. The blade 45 has a ceiling surface 45b facing the plate surface 4. This blade 45
Is made of stainless steel, aluminum, plastic, etc.

Clamp lever 3 for adjusting the squeegee angle
When the rotary solenoid 25 for tilting the squeegee is driven with the adjustment screw 38 for the ink scraping position positioned while tightening the screw 4, the rotary plate 27 and the connecting plate 31 of the squeegee bar 11 rotate together, The squeegee 15 tilts in the front-back direction A. At the time of tilting, the stopper pin 35 for the ink scraping position
Comes into contact with the ink scraping position adjusting screw 38, the squeegee 15 approaches the doctor 17 and the ink scraping position P is reached.
Then, the center 40a of the squeegee rubber 40 becomes a right angle to the plate surface 4. When the rotary plate 29 contacts the printing position stopper pin 37, the squeegee 15 moves away from the doctor 17 to the printing position Q, and the center 40a of the squeegee rubber 40 tilts forward. On the other hand, when the squeegee angle adjusting clamp lever 34 is operated to change the positional relationship of the connecting plate 31 with respect to the rotating plate 29, the squeegee 1
At the ink scraping position P of 5, the center 40 of the squeegee rubber 40
The angle that a makes with the printing plate 4 changes slightly.

Particularly, the squeegee 15 has the ink scraping position P.
When the piston rod 9a of the doctor up-and-down cylinder 9 is advanced and retracted in the state of (1), the blade 45 of the ink scraping plate 43 moves in parallel in the vertical direction B while contacting the side surface of the squeegee rubber 40 with the scraping portion 45a. In order to bring the scraping portion 45a of the blade 45 into contact with the squeegee rubber 40 smoothly, the angle of the squeegee 45 is adjusted as described above.

Next, the operation of this apparatus will be described with reference to a normal printing cycle (see FIG. 6) and an ink scraping printing cycle (see FIG. 7).
I will explain separately. First, in the normal printing cycle,
The squeegee 15 is always at the printing position Q, and the squeegee 15 and the doctor 17 simply move back and forth in the up and down direction B. That is, in the state shown in FIG. 6A, the squeegee 15 moves upward and the doctor 17 moves downward so that the ink return plate 42 is in contact with the plate surface 4. In this state, as shown in FIG. 6B, the squeegee 15 and the doctor 17 move forward along the plate surface 4, and the ink return plate 42 applies ink to the plate surface 4. Next, as shown in FIG. 6C, the doctor 17 moves up and the squeegee 15 moves down so that the squeegee rubber 40 contacts the plate surface 4. And
As shown in FIG. 6D, the squeegee 15 and the doctor 1
When 7 moves rearward along printing plate 4, squeegee rubber 4
When 0, the plate surface 4 is pressed and printing is performed. afterwards,
The squeegee 15 moves up and the doctor 17 moves down, returning to the state of FIG.

Next, in the ink scraping printing cycle, the movements of the squeegee 15 and the doctor 17 shown in FIGS. 7 (a) to 7 (d) are the same as those of the normal printing cycle described in FIGS. 6 (a) to 6 (d). Similar to that of FIG. 7 (e),
It differs from the normal printing cycle in that the ink scraping step shown in (f) is added. That is, when printing is completed as shown in FIG. 7D, the squeegee 15 moves upward, tilts from the printing position Q, and approaches the doctor 17,
The ink scraping position P is reached as shown in (e). In this state, the scraping portion 45a of the blade 45 of the ink scraping plate 43 contacts the upper part of the side surface of the squeegee rubber 40, and the ink adhering to the side surface of the squeegee rubber 40 is covered by the ceiling surface 45b of the blade 45 above it. Then, as shown in FIGS. 7F and 2, when the doctor 17 moves downward, the blade 45 moves downward along the side surface of the blade 45 while the scraping portion 45a of the blade 45 contacts the side surface of the squeegee rubber 40. The ink attached to the squeegee rubber 40 is scraped off by the blade 45. In this case, since the ceiling surface 45b of the blade 45 covers above the ink attached to the squeegee rubber 40, the ink is reliably scraped off without escaping upward. After that, the squeegee 15 tilts from the ink scraping position P to the printing position Q and returns to the state of FIG.

In this way, since the ink is removed from the squeegee rubber 40, the ink generated between the squeegee rubber 40 and the plate surface 4 when the squeegee 15 prints as shown in FIGS. 7 (c) and 7 (d). The rotational flow is smoothly performed, and the printing condition is improved.

In another example of the ink scraping printing cycle shown in FIG. 8, the ink scraping action from FIG. 8 (f) to FIG. 8 (a) is the same as that of the ink scraping printing cycle shown in FIG. 7E is the same as the ink scraping action from FIG. 7F, but the ink returning action from FIG. 8A to FIG. 8B and the ink scraping action from FIG. 7A to FIG. 7 is different from the case shown in FIG. 7 in that the squeegee 15 is at the ink scraping position P in this other example.

[0028]

[Second Embodiment] In the first embodiment, the ink scraping plate 43 is used.
Is attached to the doctor 17, but FIG. 9 and FIG.
In the second embodiment shown in FIG. 0, the ink scraping plate 43 is attached to the squeegee plate 39 with a fixing screw 44. The blade 45 of the ink scraping plate 43 is bent in a direction orthogonal to the center 40 a of the squeegee rubber 40 and extends toward the doctor 17. With the squeegee 15 in the ink scraping position P, the blade 45 becomes parallel to the plate surface 4, that is, at a right angle to the ink return plate 42 of the doctor 17, and the scraping portion 45a of the blade 45 is formed.
Contacts the ink return plate 42. The ink adhered to the ink return plate 42 is above the ceiling surface 45b of the blade 45.
Covered by.

During the ink scraping printing cycle shown in FIGS. 10 (a) to 10 (f), the doctor 17 moves downward with respect to the squeegee 15 in the upper moving position at the ink scraping position P as shown in FIG. 10 (c). The ink moves up from the position and the ink adhered to the ink return plate 42 is scraped off by the blade 45 as shown in FIGS. In this way, when the ink is removed from the ink return plate 42 of the doctor 17,
During the ink returning process, the rotational flow of the ink generated between the plate surface 4 and the ink returning plate 42 is smoothly performed, and the ink is applied to the plate surface 4 in a good condition, and thus the printing condition is improved.

In another example of the ink scraping printing cycle shown in FIG. 11, as compared with the ink repelling action shown in FIGS. 10A to 10B, FIGS. 11A to 11B are obtained. The difference is that the squeegee 15 is at the ink scraping position P due to the ink returning action.

[0031]

Third Embodiment In the third embodiment shown in FIGS. 12 and 13, unlike the first and second embodiments, an ink scraping plate 43 is attached to the carriage 7 with a fixing screw 44. The ink scraping plate 43 passes between the squeegee bar 11 and the doctor bar 13 and passes through the squeegee 15
And the doctor 17 are extended downward, and the blade 45 is provided in the lower end part. The blade 45 extends in parallel with the plate surface 4 on the side of the squeegee 15 and the doctor 17, respectively. The blade 45 forms a right angle with the center 40a of the squeegee rubber 40 at the ink scraping position P and the ink return plate 42 of the doctor 17, and both scraping portions 45a of the blade 45 are respectively squeegee rubber 40.
Is in contact with the ink return plate 42.

In the ink scraping printing cycle shown in FIGS. 13A to 13F, the squeegee 15 and the doctor 1 are used.
With the vertical movement of 7, the ink adhering to the side surface of the squeegee rubber 40 and the ink return plate 42 is scraped off by the scraping portion 45 a of the blade 45. In the first and second embodiments, the squeegee rubber 40 and the ink return plate 42 are used.
Only the ink attached to one of them can be removed, but the third embodiment is excellent in that both of them can be removed.

In another example of the ink scraping printing cycle shown in FIG. 14, as compared with the ink repelling action shown in FIGS. 13 (a) and 13 (b), FIGS. 14 (a) to 14 (b) are obtained. The difference is that the squeegee 15 is at the ink scraping position P due to the ink returning action.

[0034]

[Fourth Embodiment] In the first, second, and third embodiments, the ink scraping plate 43 having the blade 45 is positively provided in relation to the squeegee 15 and the doctor 17 to scrape the ink. However, in the fourth embodiment shown in FIG. 15 and FIG. 16, such an ink scraping plate 43 is not provided, but the zucchige rubber 40 and the ink return plate 42 of the doctor 17 are brought into contact with each other and moved in the upside down direction. The ink is scraped off by the contact pressure between them. For example, in the ink scraping printing cycle shown in FIG. 16, the lower end portion of the squeegee rubber 40 functions as the scraping portion 46, and after the ink is returned from FIG. 16A to FIG. As shown in (c) to (d), when the doctor 17 moves upward, the ink adhering to the ink return plate 42 is scraped off by the scraping portion 46 of the squeegee rubber 40. Although not shown, in another ink scraping printing cycle, the lower end portion of the ink return plate 42 may also serve as a scraping portion, and the scraping portion scrapes the ink on the squeegee rubber 40.

In another example of the ink scraping printing cycle shown in FIG. 17, the case where the position of the squeegee 15 is as shown in FIGS. 16 (a) and 16 (b) due to the ink returning action from FIG. 17 (a) to (b). different.

[0036]

According to the screen printing machine of the present invention, the ink adhered to the squeegee 15 and the doctor 17 can be surely removed by the scraping portions 45a and 46 during the printing cycle, so that the squeegee on the plate surface 4 is removed. When the 15 and the doctor 17 move, the rotational flow of the ink improves,
Good printing can be performed.

[Brief description of drawings]

FIG. 1A is a schematic front sectional view showing a squeegee and a doctor of a screen printing machine according to a first embodiment, a drive system thereof and a plate frame, and FIG. 1B is a XX line of FIG. It is a partial side sectional view.

FIG. 2 is a partially enlarged front sectional view of FIG.

FIG. 3 is an enlarged side sectional view taken along line Y1-Y1 of FIG.

FIG. 4 is an enlarged side sectional view taken along line Y2-Y2 of FIG.

5A is a partial front sectional view taken along the line Z1-Z1 of FIG. 3, and FIG. 5B is a partial front sectional view taken along the line Z2-Z2 of FIG.

FIG. 6A to FIG. 6D are operation explanatory views showing a normal printing cycle in the screen printing machine according to the first embodiment.

7 (a) to 7 (f) are operation explanatory views showing an ink scraping printing cycle in the screen printing machine according to the first embodiment.

FIG. 8A to FIG. 8F are operation explanatory views showing another example of the ink scraping printing cycle in the screen printing machine according to the first embodiment.

9 is a partially enlarged front sectional view corresponding to FIG. 2 in the second embodiment in which the ink scraping means is changed.

FIG. 10A to FIG. 10F are explanatory views of the operation showing the ink scraping printing cycle in the second embodiment.

FIG. 11A to FIG. 11F are operation explanatory views showing another example of the ink scraping printing cycle in the second embodiment.

FIG. 12 is a partially enlarged front section corresponding to FIG. 2 in the third embodiment in which the ink scraping means is changed.

FIG. 13A to FIG. 13G are operation explanatory views showing an ink scraping printing cycle in the third embodiment.

FIGS. 14A to 14G are operation explanatory views showing another example of the ink scraping printing cycle in the third embodiment.

FIG. 15 is a partially enlarged front sectional view corresponding to FIG. 2 in the fourth embodiment in which the ink scraping means is changed.

16 (a) to 16 (f) are operation explanatory views showing an ink scraping printing cycle in the fourth embodiment.

17 (a) to 17 (f) are operation explanatory views showing another example of the ink scraping printing cycle in the fourth embodiment.

[Explanation of symbols]

3 plate frame, 4 plate surface, 5 traveling frame, 6 drive belt as drive means, 7 carriage, 8 squeegee up / down cylinder as drive means, 9 doctor up / down cylinder as drive means, 10 squeegee support mechanism, 1
1 squeegee bar, 12 doctor support mechanism, 13 doctor bar, 14 squeegee holder, 15 squeegee, 16 doctor holder, 17 doctor, 25
Rotary solenoid for tilting squeegee as driving means, 27 rotating shaft, 29 rotating plate, 31
Connection plate, 39 squeegee plate, 40 squeegee rubber, 42 ink return plate, 43 ink scraping plate,
45 blade, 45a scraping part, 45b ceiling surface,
46 Scraping part, P ink scraping position, Q printing position.

Claims (5)

[Claims] 1. A squeegee (15) and a doctor (17) above a printing plate (4) by a driving means (6) by a printing plate (4).
Along with the squeegee (15) and the doctor (17), the squeegee (15) and the doctor (17) are supported so as to be capable of reciprocating in the front-rear direction (A) and arranged on both front and rear sides along the moving direction.
9) A screen printing machine which is supported by the plate surface (4) so as to be able to reciprocate in the up-and-down direction (B) so as to come close to and away from the plate surface (4) and can come into contact with the plate surface (4). 17) and the driving means (25) are made movable relative to each other, and printing positions (Q) separated from each other.
And an ink scraping position (P) close to each other can be taken, and at this ink scraping position (P), as the squeegee (15) and the doctor (17) move up and down, the squeegee (15) and the doctor ( A scraping device (45a, 46) capable of coming into contact with at least one of 17), the scraping device for scraping ink deposited on a squeegee or a doctor in a screen printing machine. 2. The scraping portion (45a) according to claim 1.
Is provided on a blade (45) attached to a doctor (17) in order to scrape off the ink adhered to the squeegee (15), and a device for scraping ink adhered to the squeegee or the doctor in a screen printer. . 3. The scraping portion (45a) according to claim 1.
Is provided on a blade (45) attached to a squeegee (15) for scraping off the ink adhering to the doctor (17), and an adhering ink scraping device for a squeegee or a doctor in a screen printing machine, . 4. The scraping portion (45a) according to claim 1.
Is provided on a blade (45) separated between them between the squeegee (15) and the doctor (17), which blade (45) along with the squeegee (15) and the doctor (17) along the plate surface (4). An apparatus for scraping ink adhered to a squeegee or a doctor in a screen printing machine, which is supported so as to be able to reciprocate in the front-back direction (A). 5. The squeegee or doctor of a screen printing machine according to claim 2, 3 or 4, wherein the blade (45) has a ceiling surface (45b) facing the plate surface (4). Adhesive ink scraping device.