JP3017448B2 - Screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine provided with a printing table mechanism, a plate mounting mechanism, and a printing mechanism, and to an improvement in a plate mounting mechanism and a driving unit of the printing mechanism.

[0002]

2. Description of the Related Art Conventional screen printing machines are roughly classified into:
A printing table mechanism having a table or the like for placing and positioning an object to be printed at the time of printing, a plate mounting mechanism having a plate holding portion to which a screen plate applied to the object to be printed on the table at the time of printing, and a screen mounting mechanism at the time of printing A printing mechanism having a squeegee or the like that moves while being pressed against the plate and prints on the printing material on the table. The plate mounting mechanism and the printing mechanism are provided integrally. Then, the plate mounting mechanism and the printing mechanism move up and down with respect to the printing table mechanism, or conversely, the table of the printing table mechanism moves up and down with respect to the plate mounting mechanism and the printing mechanism. Therefore, cleaning and maintenance of the screen plate can be performed by separating the screen plate of the plate holding portion from the printing object positioning surface of the table.

[0003]

In such a screen printing machine, when the squeegee and the doctor of the printing mechanism reciprocate during printing, the vibration generated in the printing mechanism due to the shock generated when the movement starts or stops. The vibration is directly transmitted to the plate holder of the plate mounting mechanism, and the screen plate of the plate holder also vibrates. For this reason, it causes fine shaking of the image on the screen plate at the time of printing, and a good printing state cannot be obtained.

[0004] It is an object of the present invention to obtain a good printing state by suppressing vibrations generated on a screen plate during printing.

[0005]

The present invention will be described with reference to the reference numerals of the drawings (FIGS. 1 to 4) of the embodiments described later. Claim 1
The screen printing machine according to the invention comprises a printing table mechanism (A), a plate mounting mechanism (B), and a printing mechanism (C). In the printing table mechanism (A), a table (2) for placing and positioning a printing object (W) during printing
Having. The plate mounting mechanism (B) has a plate holding part (3) to which a screen plate (5) that is applied to a printing object (W) on the table (2) at the time of printing is mounted. In the printing mechanism (C), a squeegee (1) that moves while being pressed against the screen plate (5) during printing and prints on the printing object (W) on the table (2).
3). In the printing table mechanism (A) ,
Screen plate-holding portion with respect to the substrate positioning surface (2a) of the plate-holding portion (3) by moving the table of the plate attachment mechanism to a constant state table (2) (B) (2) (3) The plate (5) is placed on the table (2) at the start of printing.
To approach the printing position applied to the printed matter (W)
Move it away from the printing position after printing.
Causes the urchin moves, is provided with the plate mounting mechanism plate-holding portion (B) (3) of said printing mechanism (C) drive unit for moving independently separated (6).

[0006] The invention of claim 2 adds the following configuration to the invention of claim 1. A drive unit (15, 16, 17) for retracting the squeegee (13) of the printing mechanism (C) from the relative movement trajectory range of the plate holding unit (3) of the plate mounting mechanism (B) to the retracting unit (S) outside the range. , 18, 19) are provided.

[0007] The invention of claim 3 adds the following configuration to the invention of claim 2. In the retracting section (S), an ink receiving section (20) is provided below the retracted position of the squeegee (13).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a screen printing machine according to an embodiment of the present invention will be described with reference to the drawings.

The screen printing machine schematically shown in FIGS. 1 to 4 is roughly divided into a printing table mechanism A, a plate mounting mechanism B, and a printing mechanism C. (About the outline of the print table mechanism A) The print table mechanism A has a fixed table 2 that is installed on the machine base 1 and does not move up and down. A printing medium positioning surface 2 a is provided on the table 2.
The height of a is constant. When printing, the substrate W
Is placed on the printing substrate positioning surface 2a and positioned by a supply conveyor (not shown). Further, after printing, the print material W is discharged by a discharge conveyor (not shown).
The printing material is discharged from the positioning surface 2a.

(About the Plate Mounting Mechanism B) The plate mounting mechanism B is installed on the machine base 1 and has a plate holding section 3. The plate holding unit 3 has a plate frame 4, and a screen plate 5 is attached to the inside of the plate frame 4 in a state of being stretched along the printing substrate positioning surface 2 a of the table 2.
A plurality of lifting air cylinders 6 (driving units) are installed in the machine base 1, and the plate frame 4 is supported on each piston rod 6a. In addition, a plurality of guide rods 7
Are supported so as to be able to move up and down, and the plate frame 4 is supported on the guide rod 7. And each of these piston rods 6
When a moves up and down, the plate holder 3 on which the screen plate 5 is stretched
Moves up and down while being guided by each guide rod 7.

(Outline of the printing mechanism C) A machine frame 8 is mounted on the machine base 1 in a fixed state. The printing mechanism C is installed in the machine frame 8. In this machine frame 8, guide rails 9 are provided on both sides in the left-right direction (the direction orthogonal to the drawing), and a support base 10 is provided on each of the left and right guide rails 9 in the front-rear direction (left-right direction in the drawing). It is movably supported. This left and right support base 1
A squeegee air cylinder 11 and a doctor air cylinder 12 (drive unit) are attached to the upper and lower sides of the squeegee air cylinder 11, respectively.
A squeegee 13 is installed between the squeegees 13 and the piston rods 12a of the air cylinders 12 for the left and right doctors.
A doctor 14 is provided between them.

The drive unit for reciprocating the squeegee 13 and the doctor 14 in the front-rear direction is configured as follows. In the machine frame 8, a left and right reciprocating rotary belt 17 is stretched between a driven pulley 15 and a driving pulley 16 supported on both left and right sides of the front and rear ends, respectively. The support base 10 is connected. The rotation of a motor 18 is transmitted to the drive pulley 16 by an interlock belt 19. When the left and right belts 17 reciprocate, the squeegee 13 and the doctor 14 reciprocate along the screen plate 5 in the front-rear direction, and as shown in FIGS. (Relative movement trajectory range) and a state located in the evacuation section S outside this vertical trajectory range as shown in FIGS. In this case, the trajectory of the support base 10 supporting the squeegee 13 and the doctor 14 reciprocating along the guide rail 9 has a constant height and is parallel to the printing object positioning surface 2a of the table 2. I have.

In the retracting section S, an ink receiving section 20 is provided in the machine frame 8 below the retracting positions of the squeegee 13 and the doctor 14. (Overview of the printing operation and cleaning of the screen printing machine) 1) Printing end state shown in FIG.
Is placed on the printing substrate positioning surface 2a of the table 2 and positioned.

In the plate mounting mechanism B, at the time of printing, the screen plate 5 of the plate holding unit 3 is moved to the printing object positioning surface 2a of the table 2 at the printing position where the plate holding unit 3 is moved down by the air cylinder 6 for lifting. The print object W on the table 2 is approached.

In the printing mechanism C, at the time of printing, the squeegee 13 is moved down by the air cylinder 11 and the doctor 14 is moved up by the air cylinder 12 at the printing start position (right side in FIG. 1). Is pressed from the printing start position to the printing end position (the left side in FIG. 1) by the rotating belt 17 while being pressed against the screen plate 5, and the printing is performed on the printing material W. The squeegee 13 is also moved upward by the air cylinder 11 at the printing end position from the printing end state shown in FIG.

Next, in the plate mounting mechanism B, the plate holding portion 3
Is moved upward by the lifting / lowering air cylinder 6, and the screen plate 5 of the plate holding unit 3 is separated from the printing object positioning surface 2a of the table 2.

Then, in the print table mechanism A, the printed material W after printing is carried out, and the printed material W before printing is carried in. Next, in the plate mounting mechanism B, the plate holding unit 3 is moved down by the lifting / lowering air cylinder 6, and the screen plate 5 of the plate holding unit 3 approaches the printing object positioning surface 2 a of the table 2 so that the screen plate 5 is placed on the table 2. This is applied to the print substrate W.

Thereafter, only the doctor 14 is moved downward by the air cylinder 12 and moved from the printing end position to the printing start position by the rotary belt 17 while being pressed against the screen plate 5, and ink is returned.

Next, in the printing mechanism C, printing is performed on the printing substrate W in the same manner as described above. 2) Retracting state of squeegee etc. shown in FIG. 2 From the printing end state shown in FIG. 1, at the printing end position (left side in FIG. 2), the squeegee 13 is moved up by the air cylinder 11 and the doctor 14 is moved by the air cylinder 12. Move to the top.

3) Squeegee retreat complete state shown in FIG. 3 Squeegee 1 passes through the squeegee retreat middle state shown in FIG.
3 and the doctor 14 are moved from the printing end position (the left side in FIG. 3) to the retreat unit S by the rotating belt 17.

4) Plate-cleanable state shown in FIG. 4 In the plate-mounting mechanism B, when cleaning the plate, the plate-holding unit 3 is moved upward from the printing position by the air cylinder 6 for lifting and lowering, and the printing object positioning surface 2a of the table 2 is moved. Then, the screen plate 5 of the plate holding unit 3 is separated. Further, the plate holder 3 moves up to the plate cleaning position above the right and left guide rails 9 of the printing mechanism C and between the left and right reciprocating rotary belts 17 to the plate cleaning position. Cleaning and maintenance of the screen plate 5 are performed at this plate cleaning position. After the completion of the cleaning or the like, the evacuation state of the squeegee etc. shown in FIG. 3 and the evacuation state of the squeegee etc. shown in FIG.

This embodiment has the following features (a) to (d). (A) The plate holding unit 3 of the plate mounting mechanism B separates from the printing mechanism C and moves up and down independently. Therefore, when the squeegee 13 and the doctor 14 of the printing mechanism C reciprocate at the time of printing, even if vibration occurs in the printing mechanism C due to an impact generated when the movement starts or stops, the vibration is generated by the plate of the plate mounting mechanism B. The vibration is not directly transmitted to the holding unit 3, and the vibration generated in the screen plate 5 of the plate holding unit 3 is suppressed. Accordingly, it is possible to obtain a good printing state without causing fine image shaking on the screen plate 5 during printing.

(B) The plate holding portion 3 of the plate mounting mechanism B moves up and down, but the squeegee 1 is moved in the printing mechanism C in a fixed state.
3 and the reciprocating trajectory of the doctor 14 do not change up and down,
The plate holding unit 3 is positioned on the printing substrate positioning surface 2a of the table 2.
The parallelism is maintained regardless of the elevating. Therefore, after setting the gap between the screen plate 5 and the printing material W on the table 2 (the printing position where the plate holding unit 3 has moved down), the squeegee 13
Is once determined to determine the printing pressure (the printing position at which the squeegee 13 has moved down) once the plate holding unit 3 and the squeegee 13
As long as the printing position is maintained, the printing pressure (squeegee pressure) remains constant, and a good printing state can be obtained.

(C) At the time of plate cleaning, the retracting section S outside the range of the vertical trajectory range (relative movement trajectory range) of the plate holding section 3
The squeegee 13 and the doctor 14 retract. Therefore,
When the plate holder 3 moves up and down, interference between the plate holder 3 and the squeegee 13 and the doctor 14 can be prevented.

(D) In the evacuation section S, the squeegee 1
3 and the ink receiving section 2 below the retracted position of the doctor 14.
0 is provided. Then, the ink dripping from the squeegee 13 and the doctor 14 accumulates in the ink receiving section 20. Therefore, it is possible to prevent the machine base 1 and other mechanisms from being stained around the plate holding unit 3.

[Other Embodiments] In addition to the above-described embodiments, the following embodiments (a) to (b) may be adopted. (B) The relative movement relationship between the table 2 and the plate holder 3 is configured as follows. Contrary to the case of the above-described embodiment, the table 2 is moved up and down with respect to the plate holder 3, and the screen plate 5 of the plate holder 3 approaches or separates from the printing object positioning surface 2a of the table 2. Even in this case,
The plate holder 3 moves up and down independently of the printing mechanism C.

(B) The supply and discharge of the printing material W are configured as follows. The table 2 can have a carry-in position facing the lower side of the screen plate 5 and a position retracted from the lower side. And, before printing, the printing material W
Is placed on the table 2 at the evacuation position, the table 2 is set to the carry-in position to supply the printing medium W, and after printing, the table 2 is set to the evacuation position again to discharge the printing object W.

[0028]

According to the screen printing machine of the first aspect of the invention, the vibration from the printing mechanism (C) is not directly transmitted to the plate holding portion (3) of the plate mounting mechanism (B),
Vibration generated in the screen plate (5) of the plate holding section (3) is suppressed, and a good printing state can be obtained.

According to the second aspect of the invention, in addition to the effects of the first aspect, it is possible to prevent interference between the squeegee (13) and the plate holding portion (3) which moves most during plate cleaning. According to the invention of claim 3, in addition to the effect of the invention of claim 2,
When the squeegee (13) is retracted, ink dripping from the squeegee (13) can be prevented from accumulating in the ink receiving portion (20) and soiling the periphery of the plate holding portion (3).

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a printing end state in a screen printing machine according to an embodiment.

FIG. 2 is a schematic front view showing a state in which the squeegee is being retracted.

FIG. 3 is a schematic front view showing a squeegee and the like retreat completion state.

FIG. 4 is a schematic front view showing the plate cleaning state.

[Explanation of symbols]

2 ... Table, 2a ... Printed object positioning surface, 3 ... Plate holding part, 5 ... Screen plate, 6 ... Elevating air cylinder as drive part, 13 ... Squeegee, 20 ... Ink receiving part, A ...
Printing table mechanism, B: plate mounting mechanism, C: printing mechanism, W
... substrate to be printed, S ... evacuation unit.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41F 15/40-15/42 B41F 15/00-15/08

Claims (3)

(57) [Claims] 1. A printing table mechanism (A) having a table (2) for placing and positioning an object to be printed (W) during printing.
A plate mounting mechanism (B) having a plate holder (3) to which a screen plate (5) that is applied to the substrate (W) on the table (2) at the time of printing; 5) a printing mechanism (C) having a squeegee (13) for printing on the printing material (W) on the table (2) by moving while being pressed against the table (2); The plate holding unit (3) of the plate mounting mechanism (B) with respect to the table (2) in the fixed state in (A) .
Was allowed to move the substrate positioning surface of the table (2) (2
The screen plate (5) of the plate holder (3) is marked with respect to a ) .
At the start of printing, the printing material (W) on the table (2) is
Move the print position close to the printing position
After finishing, the screen plate (5) is moved from the printing position.
It is moved so as to separate, and wherein the plate attachment mechanism plate holding portion (3) of said printing mechanism (C) and separate the drive unit to move independently of the (B) (6) provided Screen printing machine. 2. A drive unit for retracting a squeegee (13) of a printing mechanism (C) from a relative movement trajectory range of a plate holding unit (3) of a plate mounting mechanism (B) to a retracting unit (S) outside the range. 1
5. The screen printing machine according to claim 1, further comprising: 5, 16, 17, 18, 19). In 3. A withdrawal避部(S), a squeegee (1
3. The screen printing machine according to claim 2, wherein an ink receiving portion is provided below the retracted position.