JPS6052432B2 - Screen photosensitive agent coater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen photosensitive agent coater for direct production and sale on screen plates.

It is well known that a bucket is used to apply a photosensitive agent to a screen plate.

In this type of coating method, when the edge of the bucket reaches the coating start position on the screen plate,
Coating with good workability is possible by tilting the bucket to let the coating liquid flow out, and raising the bucket just before reaching the coating end position of the screen plate to stop the coating liquid from flowing out. However, in order to coat the screen plate directly with the coating liquid, it is extremely difficult to adjust the coating pressure, and it cannot be done mechanically, so the method has been limited to manual work by skilled workers. The present invention provides a coater that can perform this type of coating automatically and stably. In the coater of the present invention, one of the screen plate and the bucket which are attached to the frame is held in a fixed position, and the other one is automatically moved so that the screen plate and the edge of the tip of the bucket are slid at a constant angle. For operation, the coating liquid in the bucket is coated onto the base material. In this coater, either the frame of the screen plate or the bucket is supported on a central axis parallel to the sliding direction, so that even if the frame or the screen plate is distorted during coating,
Coupled with the fact that the angle between the screen plate and the edge of the bucket is kept constant during coating so that the edge of the bucket always applies linear pressure evenly to the screen plate, automatic coating is achieved. ”Always enables uniform coating.

In addition, receivers are provided at both ends of the bucket to catch the coating liquid that overflows from both ends of the working width of the edge during coating, which prevents excess coating liquid from adhering to the coating surface during coating. ing. The shape and position of this receiver are not particularly limited, but may be any shape as long as it can collect overflowing coating liquid without forming thick ears at both ends of the coating surface.

For example, the receiver may be formed on the inside of the bucket or attached to the outside, and when attached to the outside of the bucket, the mouth of the receiver is below the edge of the tip of the bucket, and the end It is placed so as to cover the screen plate and slides in synchronization with the bucket. In addition, as an example of forming the inside of the bucket, a partition plate is provided inside the bucket and gutter-like receivers are formed at both ends of the bucket.In this case, the working width of the edge is (between the partition plates)
The coating liquid overflowing from both ends is scraped off by the edges protruding from the partition plate and collected in the gutter-like receiver. It is preferable that a coating liquid outlet be provided at the bottom of the receptacle, especially when the receptacle is formed inside the bucket. l Next, the shape of the edge at the tip of the bucket is preferably straight for double-sided coating, and curved for single-sided coating; Coating with linear pressure is possible.

In the coater of the present invention, even if the position of the screen plate (and frame) is fixed and the bucket is slidable, the coater is fixed and the screen plate (and frame) is slid. It may be hot.

In the latter case, the moving parts do not have complicated mechanisms, so they are easy to handle, but the operating height of the machine is very large. Also,
The coater of the present invention may be a single-sided coating type in which the bucket is placed only on one side of the screen plate, or a double-sided simultaneous coating type in which the bucket is placed on both sides of the screen plate. Preferably, the edge of the tip of the bucket is straight.

An embodiment of the invention is shown in the drawings.

In the example shown in FIG. 1, a bucket 4 attached to a bucket trail 3 slides on a screen plate 2 fixed to a coating table with claws 1.

Although not shown, a pin is attached to the center of the bucket trail 3, and by inserting this pin into a hole in the bracket of the bucket 4, the bucket 4 is centrally supported on the bucket trail 3. The rotation of the brake motor 5, which is reversely reversed by the controller, is transmitted to the chain 7 by the belt 6, and the chain 7 reciprocates in perfect synchronization with the left and right pairs of the upper and lower shafts 8 and sprockets 9.

A pair of cursors 10 are connected to the pair of chains 7 by a joint connector, and the cursors 10 move on a rail 11 with a guide roll 12. A swing arm 13 having a fulcrum on the cursor 10 is attached to the cursor 10, and a bucket trail 3 whose right and left ends are fixed with pins is present at the tip of the swing arm 13 over the entire working width. The swing arm 13 makes reciprocating angular movements using a rotary solenoid or an air cylinder. The coating liquid (emulsion) put in the bucket is Bucket 4.
A coating similar to a floating knife coat is applied to the tip edge 14 by the operation shown in FIG. Bucket 4 at position A moves to B due to the angular movement of swing arm 13.
It reaches the position and contacts the screen plate 2.

Therefore, the bucket trail 3 is tilted 30 to 50 degrees, and the coating liquid is applied to the screen plate 2 by the tilt of the bucket 4 on the bucket trail 3. The bucket 4 moves upward together with the cursor 10 while keeping the same slope.

When the bucket cart 4 reaches the C position, the bucket cart 4 starts returning to the horizontal position while continuing its upward movement. This operation is controlled by a signal from the microswitch 15. Since the micro switch 15 is in a fixed positional relationship with the claw 1, it works regardless of the size of the screen plate 2. The upward movement is stopped at the D position, and the bucket 4 is separated from the screen plate 2 by the return movement of the swing arm 13 and reaches the E position.

Since stopping at position D is effected by a signal from the microswitch 16, the screen plate 2 can be placed at the most desirable position regardless of the size of the screen plate 2. The bucket 4 returns from position E to position A as the cursor descends.

By moving the bucket 4 in this manner, the printing machine of this embodiment can perform coating with good workability and good reproducibility.

At both ends of the bucket 4, there are receivers 17 on the outside as shown in Figure 3.
or a gutter-like receiver 17 is formed inside with a partition plate 18 as shown in FIG. 4 to receive the coating liquid 19 overflowing from both ends of the working width of the edge during coating.

Due to the presence of these receivers 17, rotation in this device is uniformly performed with a width that matches the working width of the edge 14, and unnecessary coating portions are not formed on the outside thereof.

The edge 14 may have a catenary curvature as shown in FIG.

In the present invention, when the bucket 4 is fixed, the support frame 20 of the screen plate is supported by the central axis 21 parallel to the direction of movement, as shown in FIG. 5a, so that it is not affected by the distortion of the frame 20 during coating. Screen version 2 of Edge 14
can be applied with uniform linear pressure. This effect is
It can also be obtained by fixing the frame 20 and supporting the bucket bag 4 by the central shaft 21 as shown in FIG. 5b (and the example in FIG. 1). In addition, when placing the buckets 4 on both sides of the screen plate 2, the edges 14 should be straight, and the buckets 4 on the back side of the screen plate 2 (the surface in contact with the printing material) should be slightly higher than the buckets on the front side (the squeegee surface). It is best to arrange it so that it exists in

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of the present invention, FIG. 2 is an explanatory view showing the state of use of FIG. 1, and FIG. 3 is a side view showing an example of the coating liquid receiver in the present invention. FIG. 4 is a perspective view showing another example of the coating liquid receiver, and FIG. 5 is an explanatory view showing the state in which the screen plate and the bucket are attached. 2... Screen version, 4... Bucket, 14... Edge, 17... Receiver, 19
・・・・・・Coating liquid.

Claims (1)

[Claims] 1. One of the screen plate and the bucket attached to the frame body is held in a fixed position, and the other one is automatically moved to maintain a certain angle of sliding between the screen plate and the edge of the tip of the bucket. It is used for coating a base material with the coating liquid in the bucket, and either the frame of the screen plate or the bucket is supported on a central axis parallel to the sliding direction, and the edge of the screen plate is supported on a central axis parallel to the sliding direction. A screen photosensitive agent coater that is designed to apply uniform linear pressure to the screen. 2. The screen photosensitive agent coater according to claim 1, wherein receivers are provided at both ends of the bucket to receive the coating liquid overflowing from both ends of the working width of the edge during coating. 3. The receiver is attached to the outside of the bucket, and the mouth of the receiver is located below the edge end of the tip of the bucket so as to cover the end, and the receiver is arranged so as to cover the edge of the bucket, and to move the screen plate in sync with the bucket. 3. The screen photosensitive agent coater according to claim 2, wherein the screen photosensitive agent coater slides by sliding. 4. The screen photosensitive agent coater according to claim 2, wherein the receiving device is formed by providing a partition plate inside the bucket and forming both ends of the bucket in the shape of a gutter. 5. The screen photosensitive agent coater according to claim 4, wherein a coating liquid outlet is provided at the bottom of the receiver. 6. Claim 1, wherein the edge of the tip of the bucket is formed with a curvature on a catenary line.
The screen photosensitive agent coater according to any one of items 1 to 5. 7. The screen photosensitive agent coater according to any one of claims 1 to 6, wherein the screen plate is fixed and the bucket is slidable. 8. The screen photosensitive agent coater according to any one of claims 1 to 6, wherein the bucket is fixed and the screen plate is slidable. 9. The screen photosensitive agent coater according to any one of claims 1 to 8, wherein the bucket is arranged on one side of the screen plate. 10 Claims 1 to 8, characterized in that the buckets are arranged on both sides of the screen plate.
The screen photosensitive agent coater according to any one of the above items. 11. The screen photosensitive agent coater according to claim 10, wherein the edge of the tip of the bucket is formed in a straight line.