JP2001150631A - Printing table supporting mechanism in cantilever frame type screen printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a good printing under a condition that an actual microgap close to a set microgap G between a face 3a on which an article to be printed is placed and a screen plate 8 under a condition before printing is performed is kept. SOLUTION: A cantilever frame 5 can take a printable condition A where a squeegee 13 is movable back and forth while it is pressed to the screen plate 8 facing an article W to be printed on a printing table 3 and a condition that the article to be printed can be fed for separating the screen plate 8 from the article W to be printed. The printing table 3 is rotatably supported along a rotational locus face of the cantilever frame 5 to position the rotational centerline 31a of the printing table 3 on the rotational centerline 21a side of the cantilever frame 5 and to position the free end part of the printing table 3 on the free end part side of the cantilever frame 5. When rotational position Q of the printing table 3 is controlled in accordance with inclination of the cantilever frame 5 accompanied with printing pressure, etc., inclination of the face 3a on which the article to be printed is placed of the printing table can be controlled to the screen plate 8 on the cantilever frame 5 under the printable condition A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cantilever frame type screen printing machine in which a cantilever frame provided with a plate frame, a squeegee, and the like is rotatably supported so as to be in a printable state and a printable material supply state. In this regard, the present invention relates to an improvement in a mechanism for supporting a printing table.

[0002]

2. Description of the Related Art In a conventional cantilever frame type screen printing machine, a cantilever frame is rotatably supported on a machine on which a printing table is mounted, and a plate frame is attached to the cantilever frame. In addition, a squeegee is supported so as to be able to reciprocate with respect to the screen plate in the plate frame. This cantilever frame is in a printable state in which a squeegee can reciprocate while being pressed against a screen plate facing the print object placed on the print table, and separates the screen plate from the print material placed on the print table. And a state in which the printing material can be supplied.

[0003]

However, in the above-mentioned cantilever frame type screen printing machine, the cantilever frame is pressed by the printing pressure generated when the squeegee in the cantilever frame is pressed against the screen plate in a printable state. There is a possibility that the printing state may be disturbed by tilting upward and away from the printing table.

[0004] The present invention is an improvement of the support mechanism of the printing table in order to solve the above-mentioned disadvantages peculiar to the cantilever frame type screen printing machine.

[0005]

The present invention will be described with reference to the reference numerals in the drawings (FIGS. 1 to 4) of the embodiments described later. Claim 1
The cantilever frame type screen printing machine according to the invention is configured as follows.

[0006] A cantilever frame (5) is rotatably supported on a machine base (1) on which a printing table (3) is mounted. A plate frame (7) is attached to the cantilever frame (5), and a squeegee (13) is supported reciprocally with respect to a screen plate (8) in the plate frame (7). The cantilever frame (5) is a screen plate (8) facing a printing object (W) placed on a printing table (3).
A printable state (A) in which the squeegee (13) can reciprocate while being pressed, and a printable material supply that separates the screen plate (8) from the printable material (W) placed on the print table (3) State (B).

The printing table (3) is rotatably supported along the rotation locus plane (P) of the cantilever frame (5) with respect to the machine stand (1). The rotation center line (31a) of the printing table (3) is positioned on the rotation center line (21a) side, and the free end of the printing table (3) is positioned on the free end side of the cantilever frame (5). The part is located. By adjusting the rotation position (Q) of the printing table (3), the substrate to be printed of the printing table (3) is placed on the screen plate (8) in the cantilever frame (5) in the printable state (A). The position of the surface (3a) is adjustable.

According to a second aspect of the present invention, the printing table (3) according to the first aspect of the present invention is configured such that the printing table (3) has a reference rotation position (QS).
Then, the turning position (QU) can be adjusted so that it can turn to the side approaching the screen plate (8) in the cantilever frame (5) in the printable state (A).

According to a third aspect of the present invention, the printing table (3) according to the second aspect of the present invention has a reference rotation position (QS).
Then, the turning position (QD) can be adjusted such that the turning position (QD) can be turned to the side away from the screen plate (8) in the cantilever frame (5) in the printable state (A).

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cantilevered frame type screen printing machine according to an embodiment of the present invention will be described below with reference to the drawings.

<Outline of Cantilever Frame Type Screen Printing Machine shown in FIGS. 1 and 2> A printing table 3 is mounted on a support frame 2 fixed to a machine base 1 by a table support mechanism 4 (described later). A cantilever frame 5 (described below) is attached to the machine base 1 above the printing table 3 by a frame support mechanism 6 (described below) behind the printing table 3. In the machine base 1, the print table 3 side is the front side, the frame support mechanism 6 side is the rear side, and the horizontal direction connecting the front side and the rear side is the front-rear direction. Further, a horizontal direction orthogonal to the front-rear direction is defined as a left-right direction, and one of both sides in the left-right direction is defined as a left side and the other is defined as a right side.

* The cantilever frame 5 and its attachment structure A plate frame 7 is attached below the cantilever frame 5,
A screen plate 8 is provided inside the plate frame 7. Guide rails 9 are provided on both left and right sides of the cantilever frame 5, and the support base 1 is provided on each of the left and right guide rails 9.
0 is supported movably in the front-rear direction. A squeegee air cylinder 11 and a doctor air cylinder 12 are mounted on the left and right support bases 10, respectively. A squeegee 13 is provided between the piston rods 11a of the left and right squeegee air cylinders 11 and A doctor 14 is provided between the piston rods 12a of both doctor air cylinders 12.

In the cantilever frame 5, a left and right reciprocating belt 17 is stretched between a driven pulley 15 and a driving pulley 16, which are respectively supported on the left and right sides of the front and rear ends. The left and right support tables 1
0 is linked. The rotation of a drive motor 18 is transmitted to the drive pulley 16 by an interlock belt 19. When the left and right reciprocating belts 17 reciprocate, the squeegee 13 and the doctor 14 reciprocate in the front-rear direction along the screen plate 8.

* The frame support mechanism 6 The left and right arms 20 provided at the lower rear end of the cantilever frame 5 are rotatably supported on the machine base 1 by a fixed center shaft 21 so that the cantilever frame 5 is The rotation locus plane P (this fixed center axis 2
(A vertical plane perpendicular to one rotation center line 21a). A drive lever 22 is rotatably supported on the machine base 1 below the fixed center shaft 21 by a fixed center shaft 23. An interlocking link 25 rotatably supported by the drive lever 22 on a permanent center shaft 24 is rotatably supported on the left and right arms 20 by a permanent center shaft 26. When the drive lever 22 reciprocates, the cantilever frame 5 also reciprocates via the interlocking link 25 and the left and right arms 20, and the printable state A shown in FIG. 1 and the printable material supply shown in FIG. State B can be taken.

* The table support mechanism 4 (see also FIGS. 3 and 4) Legs 27, 28, 29 and 30 are attached to the lower side of the printing table 3 at the front, rear, right and left corners, respectively, in the support frame 2. And is supported movably up and down with respect to the machine base 1. Each of these legs 27, 28, 29, and 30 is
Connected to an elevating mechanism (not shown) in the inside. By this elevating mechanism, the printing table 3 is connected to each leg 27, 28, 2
It can be moved up and down via 9, 30 to finely adjust the height position (vertical position) of the printing substrate mounting surface 3a on the printing table 3. The printing table 3 is moved in the front-rear, left-right directions by an alignment mechanism (not shown) incorporated in the support frame 2,
The horizontal position of the printing object mounting surface 3a on the printing table 3 can be finely adjusted.

<Improvement of the table support mechanism 4> Of the legs 27, 28, 29, and 30, a support shaft 31 is supported between the rear left leg 29 and the rear right leg 30. A base end (rear end) 3 is rotatably supported by the support shaft 31. Among the legs 27, 28, 29, 30, the front left leg 27 and the front right leg 28 are provided with the following position adjusting means 32.

* The position adjusting means 32 The operating shaft 33 is rotatably supported through the bracket 36, the front left leg 27 and the front right leg 28 under the support frame 2 so as to be rotatable. The legs 27 and 28 are linked to each other by a cam mechanism 34. The cam mechanism 34 includes a cam plate 34a eccentrically attached to the operation shaft 33 and a cam hole 34b engaged with the cam plate 34a.
An operation handle 35 is detachably connected to the left end of the operation shaft 33 near the bracket 36. The bracket 36 has an adjustment scale 36a. Also,
Lock portions 37 are provided adjacent to the front left leg 27 and the front right leg 28, respectively. In these lock portions 37, the operating shaft 33 passes through a split plate 38 attached to the lower side of the support frame 2, and when a tightening handle 39 screwed to the split plate 38 is rotated, the split shaft 38 is rotated. Move the plate 38 to the operating shaft 33
Can be tightened or loosened.

* Positional relationship between the cantilever frame 5 and the printing table 3 (see FIG. 1). The rotation center line 31a of the printing table 3 is located on the rotation center line 21a side of the cantilever frame 5. When the free end (front end) of the printing table 3 is located on the free end (front end) of the cantilever frame 5, the printing table 3 moves along the rotation path P of the cantilever frame 5. Can rotate.

In the printable state A of the cantilever frame 5 shown in FIG. 1, the screen plate 8 approaches the printing material W placed on the printing material mounting surface 3a on the printing table 3 downwardly. In the pre-printing state, a set minute gap G is provided between the printing substrate mounting surface 3a on the printing table 3 and the screen plate 8, and the squeegee 13 reciprocates while being pressed against the screen plate 8 during printing. obtain. In the state B in which the cantilever frame 5 shown in FIG.
The screen plate 8 is separated upward from the printing material W placed on the printing material mounting surface 3a.

* Position adjustment of the print table 3 by the position adjusting means 32 (see FIG. 1) Screen plate 8 on cantilever frame 5 in printable state A
In contrast to this, the height position of the printing material placing surface 3a on the printing table 3 is finely adjusted to determine the minute gap G therebetween, and the operation handle 35 is adjusted to the reference rotation position QS of the adjustment scale 36a. Then, the substrate 3 a on the printing table 3 is horizontal. When the operation shaft 33 is rotated while viewing the adjustment scale 36a with the lock portion 37 loosened,
The printing mechanism 3 is rotated by the cam mechanism 34, and its free end (front end) moves upward (moving in the plus direction) or downward (moving in the minus direction). In this case, when the free end side of the printing table 3 approaches the screen plate 8 in the cantilever frame 5 upward in the printable state A, the printing table 3 is moved from the reference rotation position QS to the upper rotation position KU.
To be adjusted, and the printing substrate mounting surface 3a is tilted upward. Also,
Screen plate 8 in cantilever frame 5 in printable state A
In contrast, when the free end of the print table 3 is separated downward, the print table 3 can be adjusted from the reference rotation position QS to the lower rotation position QD, and the printing-substrate mounting surface 3a is inclined downward.

When the rotation position Q (QS, QU, QD) of the print table 3 is adjusted in this way, the printable state A
Thus, the position of the printing material placing surface 3a on the printing table 3 with respect to the screen plate 8 in the cantilever frame 5 can be adjusted. Incidentally, the adjustment dimension M of the printing substrate mounting surface 3a is set to a maximum of about ± 2 mm on the free end side of the printing table 3.

<Features of the present embodiment> The present embodiment has the following features (other than other technical ideas described later). In the cantilever frame type screen printing machine, the cantilever frame 5 is pressed by the printing pressure generated when the squeegee 13 in the cantilever frame 5 is pressed against the screen plate 8 with a constant squeegee pressure F during printing in the printable state A. There is a possibility that the screen plate 8 may be separated from the printing-substrate mounting surface 3a on the printing table 3 by tilting the printing plate 3 upward. Taking this point into account, the printing table 3 is adjusted from the reference rotation position QS to the upper rotation position QU side, and the printing material placing surface 3a on the printing table 3 is inclined closer to the screen plate 8. Assuming that the variation distance between the rotation center line 21a of the cantilever frame 5 and the squeegee 13 is L, the greater the variation distance L is, the greater the printing pressure is generated and the screen plate 8 is placed on the print table 3 for printing. Since the printing surface 3a is separated from the mounting surface 3a, the adjustment dimension M of the printing material mounting surface 3a is set to the maximum on the free end side of the printing table 3. When the upper rotation position QU of the printing table 3 is adjusted before printing in this manner, at the time of actual printing, the actual rotation close to the set minute gap G between the printing material mounting surface 3a and the screen plate 8 in the pre-printing state is achieved. Good printing can be performed with a small gap.

On the other hand, if necessary, the printing table 3 is adjusted from the reference rotation position QS to the lower rotation position QD, and the printing material placing surface 3a on the printing table 3 is separated from the screen plate 8 and tilted. You can make it.

[Other technical ideas] The technical ideas (other than the claims) that can be grasped from the embodiment will be described. (A) In the second or third aspect, there is provided a position adjusting means 32 capable of adjusting the rotation position Q of the printing table 3. Therefore, the rotation position Q of the printing table 3 can be easily adjusted.

(B) In the above (A), the position adjusting means 32 has a lock portion 37 for fixing the print table 3 so as not to rotate and setting the rotation position Q. Therefore, after the rotation position Q of the printing table 3 is adjusted, the adjusted position can be reliably held and good printing can be performed.

(C) In the above (a) or (b), the position adjusting means 32 adjusts the rotation of the printing table 3 with respect to the reference rotation position QS with respect to the reference rotation position QS, QD.
6a. Therefore, it is possible to accurately adjust the rotation position Q of the printing table 3 and perform good printing.

[0027]

According to the cantilever frame type screen printing machine according to the present invention, the cantilever frame (5) accompanying the printing pressure or the like.
Position (Q) of the printing table (3) according to the inclination of
Is adjusted so that the inclination of the printing substrate mounting surface (3a) can be adjusted, so that good printing can be performed.

[Brief description of the drawings]

FIG. 1A is a schematic right side view showing a printable state of a cantilever frame in a cantilever frame type screen printing machine according to the present embodiment, and FIG. 1B is a screen plate and a print substrate on a print table. It is an operation explanatory view showing a positional relationship with a mounting surface.

FIG. 2 is a schematic right side view showing a state in which a cantilever frame can supply a printing material in the cantilever frame type screen printing machine according to the present embodiment.

FIG. 3A is a front view schematically showing a printing table and a table support mechanism in the cantilever frame type screen printing machine, FIG. 3B is a partial left side view of FIG. () Is a partial sectional view of the cam mechanism of the position adjusting means in the table support mechanism as viewed from the side.

FIG. 4 is a rear view schematically showing a printing table and a table support mechanism in the cantilever frame type screen printing machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machine stand, 3 ... Printing table, 3a ... Printed object mounting surface,
5: cantilever frame, 7: plate frame, 8: screen version, 13
... Squeegee, 21a, 31a ... Rotation center line, W: Printed material, A: Printable state, B: Printable material supply state, P
... Rotation locus plane, QS ... Reference rotation position (rotation position Q), Q
U: upper rotation position (rotation position Q), QD: lower rotation position (rotation position Q).

Claims (3)

[Claims] 1. A cantilever frame is rotatably supported on a machine on which a printing table is mounted. A plate frame is mounted on the cantilever frame, and a squeegee is reciprocated with respect to a screen plate in the plate frame. The cantilever frame supports a printable state in which a squeegee can reciprocate while being pressed against a screen plate facing the print object placed on the print table, and the print material placed on the print table. A cantilever frame type screen printing machine capable of taking a printing plate supply state in which a screen plate is separated from a printing plate, wherein a printing table is rotatably supported on a machine base along a rotation locus surface of the cantilever frame. The rotation center line of the printing table is positioned on the rotation center line side of the cantilever frame, and the free end of the printing table is positioned on the free end side of the cantilever frame. And the position of the printing plate mounting surface of the printing table can be adjusted with respect to the screen plate in the cantilever frame in the printable state by adjusting the rotation position of the printing table. A printing table support mechanism in a cantilever frame type screen printing machine. 2. The printing table according to claim 1, wherein the printing table can be rotated from a reference rotation position so that the printing table can be rotated from the reference rotation position to a side closer to the screen plate in the cantilever frame in a printable state. The printing table support mechanism in the cantilever frame type screen printing machine according to claim 1. 3. The printing table according to claim 1, wherein the printing table can be rotated from a reference rotation position so that the printing table can be rotated in a printable state to a side away from the screen plate in the cantilever frame. 3. A printing table support mechanism in a cantilever frame type screen printing machine according to claim 2.