JP2514403B2 - Screen printing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a screen printing apparatus with a so-called plate separating operation, in which printing is performed while the screen plate is operating to open an angle in association with the movement of the squeegee member on the screen plate surface. Regarding the improvement of.

“Problems to be Solved by Prior Art and Present Invention” Conventionally, in a screen printing process, when a squeegee member squeezes a screen plate surface, the screen plate is opened from the squeegee start position side as the squeegee member moves. 2. Description of the Related Art A screen printing apparatus that uses a so-called plate-separation operation that is operated in an angular manner is widely known.

The reason why the plate separation operation is required for squeegeeing by the squeegee member is that the part where the squeegee ends, that is, the printed part, often causes the close contact between the screen plate surface and the printing medium, This is to prevent the occurrence of uneven printing and the spread of the screen printing plate. It is effective for the screen plate to open at a constant rate with the movement of the squeegee member in that it separates the screen plate surface in the printed part from the material to be printed on the printing table. Can be reached.

However, in this case, the opening angle of the screen plate is not always constant in relation to the size of the gap between the screen plate surface and the material to be printed on the printing table, the precision of the printing pattern, and the like. However, there is a case where an opening operation of a predetermined angle with a speed and a change that meet the printing conditions is required.

However, there are various difficult problems in setting the proper angle between the screen plate surface and the material to be printed on the printing table and the opening angle operation accompanied by the change of the screen plate according to the printing conditions. Realization was difficult.

Recently, a large-scale plate releasing device using a special sensor, IC or computer has appeared, but there are problems such as complicated usability and high cost.

"Means for Solving Problems" The present invention has been made in view of the state of the prior art, and an actuator for operating a cam plate that rotates in conjunction with movement of a squeegee member is provided in a lower portion of a screen plate. Arranged,
The actuating device is composed of a plurality of cam plates with different cam shapes mounted movably on the shaft, and an appropriate cam plate according to the printing conditions at that time is selected from among the cam plates to make contact with the lever. The rotating force of the cam plate is transmitted to the screen plate holding frame on the side of the squeegee starting position through the lever and the pushing member to solve the above problem.

Further, the rotative power of the cam plate which is interlocked with the movement of the squeegee member is transmitted to the screen plate holding frame body on the squeegee start position side, and the fulcrum shaft of the lever and the The above-mentioned problem was solved by mounting the second pushing-up member and simultaneously moving the pushing-up member and the second pushing-up member via the lever by the movement of the operating rod in the vertical direction.

[Operation] According to the present invention, the cam plates that rotate in conjunction with the movement of the squeegee member are appropriately selected from those having different cam shapes and are attached to the actuating device, so that the cam plates can be moved according to the movement stroke of the squeegee member. Since the rotation is always stopped in the state of less than one rotation, the plate separating device that performs the opening angle operation at a desired ratio with squeegee, and the lifting member and the first member via the lever by moving the operating rod. Simultaneously move the two lifting members up and down,
A screen printing device equipped with a device for adjusting the gap between the screen plate surface and the printing table can be easily obtained.

[Examples] Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

The squeegee member 2 can move above the screen plate 1 together with the ink return member 3, and both of them 2 and 3 are built in one squeegee block B.

The squeegee member 2 and the ink return member 3 which move with the movement of the squeegee block B can be alternately brought into contact with and separated from the surface of the screen plate 1, and when moving from the squeezing start position S on the surface of the screen plate 1. The squeegee member 2 squeezes ink (not shown) on the surface of the screen printing plate 1 to print a predetermined pattern on the surface of the screen printing plate 5 on the printing medium 5 on the printing table 4.

When the squeegee member 2 reaches the print processing end position E on the surface of the screen plate 1, the ink return member 3 descends with respect to the surface of the screen plate 1 to remove the squeezed ink again.
It will be scraped back to the squeegee start position S. As described above, the squeegee member 2 rises and separates from the screen plate 1 surface when the ink return member 3 contacts the screen plate 1 surface. Movement of squeegee block B
The squeegee member 2 is moved from the drive source M to the first pulley P ₁
It is realized by the power transmitted by the first belt V ₁ via.

P ₂ is a second pulley, Yes to a larger diameter than the first pulley P _1, the second belt V ₂ is are then hooked between the first pulley P _1. In addition, the second pulley P ₂ has a second
Of the cam plate actuating device 7 is a third belt V _{3 which} is hooked on a portion Pb having a smaller diameter than the portion Pa on which the belt V ₂ of FIG. It is connected to the small diameter pulley P ₃ . As shown in FIGS. 1 and 2, the cam disk operating device 7 is located below the screen plate 1 at the squeezing start position S on the surface of the screen plate 1.
It is installed in parallel with the screen plate holding frame 1a on the side,
Various deformed cam plates 10, (10a, 10b, 10c, 10d) are mounted on a shaft 9 provided in a fixed box body 8 so as to be movable in the axial direction thereof by being guided by a key groove 9a of the shaft 9. .

The third small-diameter pulley P ₃ has a shaft 9 outside the box body 8.
It is attached to the cam plate 10 by rotating power from the third belt V ₃ .

Reference numeral 11 denotes a movement restricting member for restricting the movement of the cam plate 10 in the axial direction of the shaft 9 at a predetermined position, which can be engaged with and disengaged from the cam plate 10.

Further, 12 has one end thereof always formed in a roller portion R which is in pressure contact with the cam plate 10, and the other end 12a thereof has the screen plate 1
Screen plate holding frame on the squeegeeing start position S side of the surface
Although it is an L-shaped lever connected to the push-up member 13 that comes into contact with 1a, the pressing means of the roller portion R to the cam plate 10 may be appropriately determined, and here, the elastic force of the coil spring 14 is used. The L-shaped lever 12 is swingable around the fulcrum shaft 15, but it is always swung counterclockwise by the elastic force of the coil spring 14 as described above.

Push-up member 13 that abuts on the screen frame holding frame 1a
Needless to say, it may be appropriately determined. Here, a swinging piece 13c swinging around the fulcrum shaft 16 is interposed between the operating rods 13a and 13b connected to the other end 12a of the L-shaped lever 12. I made it. By interposing the rocking piece 13c between the actuating rods 13a and 13b, there is an advantage that the opening angle operation of the screen plate 1 can be smoothly performed.
It is important that 13 is an intervening member for opening the screen plate holding frame 1a with the swing of the L-shaped lever 12.

The cam plate 10 rotates within a range of less than 360 degrees while the squeegee member 2 moves from the squeezing start position S of the screen plate 1 surface to the print processing end position E, and never makes one rotation. Is done.

The rotation restriction of the cam plate 10 that rotates in association with the movement of the squeegee member 2 transmits the power from the power source M to the cam plate 10 to the pulleys P ₁ , P ₂ , P ₃ having different diameters, respectively. This is achieved by adjusting the lengths of the belts V ₁ , V ₂ and V _{3 that} are hung on the belt while decelerating.

It is possible to mount a plurality of cam plates 10 in the cam plate actuating device 7 having various shapes suitable for respective printing conditions, and the movement restricting member 11 is restricted for each printing. Release the desired cam plate 10a
The roller portion R of the L-shaped lever 12 is pressed against the above, and at that position, the movement of the cam plate 10a is regulated by the regulation member 11 again.

Now, when the squeegee member 2 starts squeezing,
As the squeegee member 2 moves, the cam plate
10 rotates in the clockwise direction, and in accordance with this rotation, the roller portion R in pressure contact moves, and the L-shaped lever 12 also becomes a coil spring.
It swings clockwise against the elastic force of 14. By this swinging of the L-shaped lever 12, the push-up member 13 to which the other end 12a of the L-shaped lever 12 is connected operates to open the screen plate holding frame 1a on the squeegeeing start position S side, and thus the squeegee member. Along with the movement of 2, the screen plate 1 surface is so-called plate separation operation.

In the figure, reference numeral 17 denotes an operating rod that allows a supporting piece member 15a holding a fulcrum shaft 15 of the L-shaped lever 12 to move in the front-rear direction with respect to the cam plate 10. Is used to move in the axial direction, that is, in the front-back direction with respect to the cam plate 10.

As described above, the L-shaped lever 12 has its roller R pressed against the cam frame 10 and is in a fixed state. Therefore, when the fulcrum shaft 15 moves toward the center of the screen plate 1 surface in this state, the L-shaped lever 12 The other end 12a of 12 is oscillated in the clockwise direction to push up the push-up member 13 connected to the other end 12a. The upward movement of the push-up member 13 causes the screen plate holding frame 1a on the squeegee start position S side to move upward.

Further, the other end 19a of the arm piece 19 which swings around the second fulcrum shaft 21 is connected to the end 17a of the operating rod 17 which moves toward the center of the screen plate 1 surface. On the second fulcrum shaft 21 that rotates with the swing of the arm piece 19, the rotational force of the fulcrum shaft 21 comes into contact with the screen plate holding frame 1b on the print processing end position E side, and the second pushing up is performed. Member 20
The rocking piece 20b is connected to the rocking piece 20b.

Therefore, a swing arm piece for rotating the second fulcrum shaft 21 by moving the operating rod 17 toward the center of the screen plate 1 surface.
19 operates, the swinging piece 20b that transmits the rotational force of the fulcrum shaft 21 to the second lifting member 20 operates, and eventually the entire screen plate 1 in contact with the second lifting member 20 moves upward. become.

The second push-up member 20, like the push-up member 13 described above, preferably has a structure including an actuation rod 20a and a swing piece 20b swinging around the fulcrum shaft 21. Thus, by moving the operating rod 17 back and forth in the axial direction, the gap between the screen plate 1 surface and the printing table 4 can be adjusted.

Reference numeral 22 in the figure denotes a handle member for operating the screw-threading means 18, and F denotes a device frame.

[Effect] Since the present invention is configured as described above, if the cam plate is formed in advance in various different shapes, the squeegee of the squeegee member can be squeezed to open the screen plate suitable for each printing condition. It has become possible to realize the angular operation, and it has become possible to realize a screen printing device that can accurately and easily print a precise printing pattern.

Further, in the present invention, if one end of the cam plate is brought into contact with an L-shaped lever that is in pressure contact with the cam plate, the fulcrum shaft of the lever is moved to closely relate to the need for plate separation operation of the screen plate. The gap between the screen plate surface to be printed and the object to be printed on the printing table can be easily adjusted.

[Brief description of drawings]

1 is a schematic side view illustrating an apparatus according to the present invention, FIG. 2 is a schematic explanatory view of a cam plate operating apparatus, and FIG. 3 is a schematic top view of a plate separating apparatus of a printing apparatus according to the present invention. is there. 1 ... Screen plate, 1a ... Screen plate holding frame on the squeegee start position side, 1b ... Screen plate holding frame on the print processing end position side, 2 ... Squeegee member, 4 ... Printing table, 5 ... ... Printed material, 7 ... Cam disk actuator, 9 ... Shaft, 9a ... Key groove, 10 (10a, 10b, 10c,
10d,) …… Cam plate, 12 …… L-shaped lever, 13,20…
… Push-up member, 13c, 20b …… Swing piece, 14 …… Coil spring, 15, 16, 21 …… Support shaft, 17 …… Operating rod, 18 ……
Nejinishigo means, 19 ...... swinging arm pieces, B ...... squeegeeing block, M ...... driving _{source, P 1, P 2, P} 3 ...... pulley,
V ₁ , V ₂ , V ₃ ... Belt, S ... Squeegee start position,
E: Print processing end position.

Claims (3)

(57) [Claims] 1. A screen printing apparatus that prints a predetermined pattern on a screen plate surface onto a material to be printed on a printing table by squeegeeing by a squeegee member that moves at a constant speed, and rotates in conjunction with the movement of the squeegee member. The actuating device of the cam plate is arranged in the lower part of the screen plate, and the screen plate holding frame on the squeegee start position side is interposed by a lever and a pushing member which swing the turning force of the cam plate around a fulcrum shaft. The actuating device is provided with a plurality of cam plates having different cam shapes attached to a shaft arranged in a lower portion of the screen plate so as to be movable in an axial direction, according to printing conditions at that time. By selecting and moving an appropriate cam plate and bringing it into contact with the lever, the squeegee member moves on the screen plate surface. With it, a screen printing apparatus for printing with increasing screen plate surface in a desired ratio to suit each printing condition from squeezing the start position side. 2. A screen printing apparatus, which prints a predetermined pattern on a screen plate surface onto an object to be printed on a printing table by squeegeeing by a squeegee member that moves at a constant speed, and rotates in conjunction with the movement of the squeegee member. A cam plate actuating device and an actuating rod that is movable in substantially the same direction as the direction of movement of the squeegee member are provided in the lower part of the screen plate, and the turning force of the cam plate is swung about a fulcrum shaft. And a push-up member are interposed to transmit to the squeegee start position side screen plate holding frame, and as the squeegee member moves on the screen plate surface, the screen plate surface is raised at a desired ratio from the squeegee start position side. While performing printing processing, a supporting piece member that holds the fulcrum shaft of the lever is attached to the operating rod, The swing arm piece and the second push-up member are connected to the end, and the fulcrum shaft of the lever is moved by moving the operating rod to move the screen plate holding frame body on the squeegee start position side through the push-up member. At the same time as the screen is moved in the vertical direction, the screen plate holding frame on the print processing end position side is also moved in the vertical direction via the second push-up member to adjust the gap between the screen plate surface and the printing table. Printing device. 3. A cam plate actuating device, wherein a plurality of cam plates having different cam shapes are attached to a shaft arranged in a lower portion of a screen plate so as to be movable in an axial direction. By selecting an appropriate cam plate according to the printing condition and bringing it into contact with the lever, the squeegee member moved along the screen plate surface, so that the screen plate surface was adjusted to the respective printing conditions from the squeezing start position side. The screen printing apparatus according to claim 2, wherein the printing process is performed while increasing the printing rate at a desired rate.