JPH01127345A - Printing pressure setter of squeegee in screen printing machine - Google Patents

Abstract

PURPOSE:To obtain a printing pressure setter in which specifications of a displacement system and a pressure system are integrated to one system, by a method wherein a member transmitting power from a printing pressure application means to a squeegee member and an action lever linked therewith are established between two printing pressure application means, and an action specimen opposed to a stopper member regulating a transfer amount of a power transmission member is attached to this action lever CONSTITUTION:In a screen printing machine, an action lever 7 linked with a power transmission member 3 transmitting power from a printing pressure addition means, an air cylinder 2 exists between two cylinders established on both edge sides of a squeegee member 1, and its both ends are each, in a transfer free manner, attached to a frame F. Further, a stopper member 9 is established at a position opposed to a workpiece 8. Then, a transfer amount of a power transmission member to the squeegee member 1 is obtained by regulating a stroke of the workpiece 8 attached to the action lever 7 by transfer of the stopper member. Thereby, a displacement system and a pressure system of printing pressure will be simply obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention is directed to the improvement of a device in which the pressing force of the squeegee portion t+ against the screen plate surface, that is, the printing pressure (hereinafter referred to as printing pressure) = 1 constant in a screen printing machine. Pause.

``The last technology and the problem to be solved by the present invention'' Conventionally, there are two types of means for setting the printing pressure of the squeegee alt that directly applies χ・1 to the screen plate in the screen printing process. was considered.

One of them is the so-called "displacement type" in which the impression pressure is applied at a predetermined point at t7 by means of an adjusting member that receives two applied forces in each means. This printing pressure setting method is relatively effective for so-called resistance printing on thick films where stability of the squeegee angle is important.

In addition, as another specification t, l, the applied force of 1 inch of printing pressure is applied to the adjusting part t.
There is no need to maintain a constant level through the
The printing pressure applying means always applies a printing pressure corresponding to t11 directly to the screen plate surface, and is usually called a "pressure type".

In this pressure-type field a, so to speak, unrestricted printing pressure is always applied to the screen plate surface, so when polishing the tip of the squeegee side (especially for re-sharpening),
It has the advantage of not requiring adjustment of printing pressure.

As mentioned above, displacement type and pressure type each have their own advantages and therefore have different uses, but on the other hand, each of these specifications also has disadvantages, for example:
In the displacement type, it is necessary to install a printing pressure adjusting member for each printing pressure applying means, and it is also necessary to readjust the printing pressure each time the type of printing material changes.

Even with the pressure type, printing pressure is always applied to the screen plate surface without applying any pressure, making the contact angle of the squeegee member unstable, making it unsuitable for applications that require precise printing. It is.

"Means for Solving Problems" The present invention has been made in view of the state of the prior art, and is a printing pressure setting device that integrates the contradictory specifications of the displacement type and pressure type into one. is intended to be realized.

In order to achieve the above object, the present invention provides a power transmission section t-o-op between two printing pressure applying means for transmitting the power from the printing pressure applying means to the squeegee member. This is accomplished by installing an operating rod that interlocks with the second operating rod, and attaching an operating piece to the second operating rod that faces the stopper section provided to adjust the amount of movement of the power transmission section.

"Function" According to the present invention, the amount of movement of the power transmission part side O that transmits power from the printing pressure applying means to the squeegee member is determined by the cooperation between the actuation piece attached to the actuation rod interlocked with this power transmission member and the stopper member. Since it can be adjusted appropriately depending on the action, the printing pressure of the squeegee portion t0 can be set to a displacement type or a pressure type as desired.

"Embodiments" Examples of the present invention will be described below with reference to the drawings.

The present embodiment is based on a screen printing machine having a mechanism in which the squeegee member receives power from the printing pressure applying means and swings during the process of contacting the screen plate surface.

The squeegee member swings and comes into contact with the screen surface +
[ is effective for maintaining an appropriate contact angle of the squeegee member with respect to the screen plate surface, and is generally widely used.

The squeegee member 1 is held by a holder 1a and moves in the direction of the screen plate surface 12 by receiving power from an air cylinder 2 which is a printing pressure applying means. The movement of the squeegee member 1 in the direction of the screen plate surface 12 is caused by the power transmission member 3 that connects the power from the air cylinder 2 with the air cylinder 2.
This is achieved by transmitting the power to the squeegee member 1 attached to the end 3a of the power transmitting member. At this time, the power transmitting member 3 is moved by swinging through a parallel link mechanism. It is.

The parallel link mechanism is movable between an upper link piece 4 whose one end 4a is fixed to the printing press frame F, and the other end 4b of this upper link piece-1 and the end 3a of the power transmission member 3. And arm part it 6 attached in 11JIt4 shape
The power transmission section (the squeegee section together with the holder 1a attached to the third end 3a) The I roller will swing relative to the screen surface 12.

In the figure, 7 indicates an operating lever C which is connected to the third power transmission part t which transmits the power from the air cylinder 2 which is the printing pressure applying means, and two parts provided at both ends of the squeegee part t11. It exists between the air cylinders 2, and its both ends are movably attached to the printing press frame F, respectively.

The operating rod 7 and the power transmission section (
The interlocking structure with the third link may be determined as appropriate, but here, the above-mentioned parallel link mechanism is used and fixedly installed on the lower link piece 5 that swings as the power transmission member 3 moves. be.

Accordingly, the operating rod 7 rotates via the lower link piece 5 together with the squeegee portion t1 which swings a lot due to the movement of the power transmission member 3 that transmits the power from the air cylinder 2.

8 is an actuating piece attached to the approximate center of the actuating rod 7,
The power transmission section (swings in the first direction toward the squeegee section by the operation of the operating rod 7 that rotates in conjunction with the third movement).

Further, reference numeral 9 denotes a stopper part side O set at a position opposite to the operating piece 8, and is capable of moving back and forth by a predetermined amount in a direction perpendicular to the longitudinal direction of the squeegee member 1.

It is important that the stopper member 9 is able to adjust the stroke of the swinging actuating piece 8 by the operation of the actuating rod 7.
The setting structure may be determined as appropriate, but here, the operating piece 8
The stroke is adjusted by operating a micrometer M fixed to the printing press frame F.

Also, the contact portion 9 of the stopper member 9 that comes into contact with the actuating piece 8
a is an independent entity, and the interlocking with the dot portion M' of the micrometer M is realized by the elastic force of the coil link S hooked between the contact portion 9a and the micrometer fixing frame 10. ing.

The fact that the abutment part 9a of the stopper member 9 is made independent, together with the presence of the fastener 11 described later, makes it possible for the actuating piece 8 to
This is to avoid an adverse effect on the micrometer N1 due to a single impact with the micrometer N1.

As mentioned above, reference numeral 11 is a fastener screwed through the printing press frame F to fix the contact portion 9a of the stopper member 9. This prevents the contact portion 9a from shifting unexpectedly.

Now, if printing is to be carried out by a "displacement type" method in which squeezing is performed using a predetermined printing pressure, the swing stroke of the actuating piece 8 may be regulated to a desired amount. By adjusting the stroke of the actuating piece 8, the movement of the power transmission member 3 will be maintained constant afterwards, and the pressing force of the squeegee portion tol against the screen plate surface 12, that is, the printing pressure will always be at a predetermined pressure. I can maintain it.

In addition, when changing to a "pressure type" method that does not normally impose any special restrictions on the printing pressure, that is, setting the printing pressure to a suitable value that is slightly over-squeezing, It is best to move the air cylinder 2, which is set to apply pressure, to the squeegee part t1 as it is. The amount of movement of air cylinder 2 is .

It is moved back to a position where it is not restricted, thereby avoiding contact t11 with the actuating piece 8.

13 in the figure is a power 'R (
The ink return unit tt is operated by the squeegee member 1 that squeegages the screen plate surface 12 (not shown), and the ink return unit tt is activated by the squeegee member 1 that squeegages the screen plate surface 12. Scrape back to the squeegee starting position.

rEffects of the Present Invention The present invention is constructed as described above, and the amount of movement of the power transmission section tt that transmits the power of the printing pressure applying means or I) to the squeegee section Homao is equal to the amount of movement of this power transmission section. This can be achieved by appropriately changing the stroke of the actuating piece attached to the actuating rod that interlocks with section-tt, by adjusting the movement of the stopper member, so the displacement type and pressure type for printing pressure can be adjusted at any time as required. Now it can be easily obtained.

[Brief explanation of the drawing]

Figure 1 is a front perspective view of the main part of the squeegeeing device of a screen printing machine implementing the printing pressure setting device of the present invention, Figure 2 is a partially omitted right side view of Figure 1, and Figure 3 1 is a partially omitted sectional view taken along the line AA in FIG. 1. 1... Squeegee member, 2... Impression pressure applying means (air cylinder). 3... Power transmission section view, 4, 5... Link piece, 6
... Arm member, 7... Operating rod, 8... Operating piece, 9... Stopper member, 9, I... Contact portion,
11... Fastener, 12... Screen plate, S... Coil spring, ~l... Micrometer. F...Printing machine frame.

Claims (1)

[Claims] In a screen printing machine that performs a squeegeeing process by the action of printing pressure applying means provided on both end sides of a squeegee member, power from the printing pressure applying means is transmitted to the squeegee member between the two printing pressure applying means. In addition to installing an operating rod that interlocks with the power transmission member for
1. A printing pressure setting device for a squeegee member in a screen printing machine, characterized in that an actuating piece is attached that opposes a stopper member arranged to adjust the amount of movement of a power transmission member.