JP2514382B2 - Printing pressure setting device for squeegee members in screen printing machines - Google Patents

Description

The present invention relates to an improvement of a device for setting a pressing force of a squeegee member on a screen plate surface of a squeegee member, that is, a printing pressure (hereinafter referred to as printing pressure), in a screen printing machine.

"Problems to be Solved by Prior Art and Present Invention" Conventionally, two types of means for setting the printing pressure of the squeegee member with respect to the screen plate surface during the screen printing process have been considered.

One is so-called, in which the printing pressure applying force of the printing pressure applying means is maintained at a predetermined level by an adjusting member provided in each means.
It is called "displacement type", and this printing pressure setting specification is effective for so-called resistance printing or the like on the thick films I and C, which place importance on the stability of the squeegee angle.

Further, as another specification, the printing pressure applying means does not always maintain the printing pressure applying force constant through the adjusting member, but the printing pressure applying means always applies a corresponding printing pressure directly to the screen plate surface. And is usually called "pressure type".

In the case of this pressure type, so to speak, the printing pressure that is not restricted is always applied to the screen plate surface, so that it is necessary to adjust the printing pressure each time the tip of the squeegee member is ground (especially, reground). It has the advantage of not doing it.
As described above, the displacement type and the pressure type each have their own advantages and therefore have different uses, but on the other hand, each of these specifications also has disadvantages.
In the displacement type, it is necessary to install a printing pressure adjusting member in each printing pressure adding means, and it is necessary to readjust the printing pressure each time the type of the printing material is different.

Even in the pressure type, since the printing pressure on the screen plate surface is always applied without restriction, the contact angle of the squeegee member becomes unstable, and it is not suitable for precise printing. .

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

In order to achieve the above object, the present invention interlocks with a power transmission member for transmitting the power from the printing pressure applying means to the squeegee member between the two printing pressure applying means, as described in the claims. This is achieved by installing an operating rod that operates, and attaching an operating piece that opposes the stopper member that is provided to adjust the amount of movement of the power transmission member to the operating rod.

[Operation] According to the present invention, the amount of movement of the power transmission member that transmits power from the printing pressure applying means to the squeegee member is determined by the cooperation of the operation piece and the stopper member attached to the operation rod interlocking with the power transmission member. The printing pressure of the squeegee member can be arbitrarily set to the displacement type or the pressure type because the printing pressure can be adjusted appropriately.

[Examples] Examples of the present invention will be described below with reference to the drawings.

It should be noted that this embodiment is based on a screen printing machine having a mechanism in which the squeegee member swings while being brought into contact with the screen plate surface by receiving power from the printing pressure applying means.

The mechanism in which the squeegee member swings to come into contact with the screen plate surface is effective for maintaining a proper 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 is moved in the direction of the screen plate surface 12 by the power of an air cylinder 2 which is a printing pressure adding means. The movement of the squeegee member 1 toward the screen plate surface 12 is transmitted to the power transmission member 3 connected to the air cylinder 2 by the power from the air cylinder 2, and then to the squeegee member 1 attached to the end 3a of the power transmission member. This is realized by transmission, but at this time, the movement of the power transmission member 3 is made to oscillate through a parallel link mechanism.

The parallel link mechanism includes an upper link piece 4 whose one end 4a is fixed to the printing machine frame F, and the other end of the upper link piece 4.
It is composed of a lower link piece 5 which is movably provided between 4b and the end portion 3a of the power transmission member 3 and which is present via an arm member 6 which is attached in an inclined shape, and connects the upper and lower link pieces 4 and 5. By the operation of the inclined arm member 6, the power transmission member 3
Squeegee member 1 with holder 1a attached to the end 3a of
Will oscillate with respect to the screen printing plate 12.

Reference numeral 7 in the drawing denotes an operating rod that works in conjunction with a power transmission member 3 that transmits power from an air cylinder 2 that is a printing pressure adding means, and is between two air cylinders 2 provided on both end sides of the squeegee member 1. Exist at both ends,
It is movably attached to the printing machine frame F.

The interlocking structure of the power transmission member 3 and the operating rod 7 interlocking with the power transmission member 3 may be appropriately determined, but here, the parallel link mechanism described above is used to swing by the movement of the power transmission member 3. It is fixedly installed on the lower link side 5. Therefore, the operating rod 7 rotates via the lower link piece 5 together with the squeegee member 1 that swings by the movement of the power transmission member 3 that transmits the power from the air cylinder 2.

Reference numeral 8 denotes an operating piece attached to the substantially central side of the operating rod 7, and the operating rod 7 rotates in conjunction with the movement of the power transmission member 3.
Is swung toward the squeegee member 1.

Further, 9 is a stopper member which is set at a position facing the actuating piece 8 and can be moved 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 can adjust the stroke of the operating piece 8 which is rocked by the operation of the operating rod 7. The setting structure thereof may be appropriately determined, but here, the stroke of the operating piece 8 is adjusted. It depends on the operation of the micrometer M fixed to the printing machine frame F.

In addition, the contact portion of the stopper member 9 that contacts the operating piece 8
9a is independent, and interlocking with the dot portion M'of the micrometer M is realized by the elastic force of the coil spring S hooked between the abutting portion 9a and the micrometer fixing frame 10. ing.

The presence of the contact portion 9a of the stopper member 9 independently is to prevent the adverse effect on the micrometer M due to the collision with the operating piece 8 together with the presence of the fastener 11 described later.

As described above, 11 is a fastener threaded through the printing machine frame F to fix the abutting portion 9a of the stopper member 9, and the abutting portion 9a by the impact force when the operating piece 8 abuts. It prevents the accidental movement of.

If printing is to be performed by a "displacement type" method in which squeezing is performed with a predetermined printing pressure, the swing stroke of the operating piece 8 may be restricted to a desired amount. For that purpose, the micrometer M is operated. If the stroke of the operating piece 8 is adjusted by means of this, the movement of the power transmission member 3 will be kept constant after the fact, and the pressing force of the squeegee member 1 against the screen plate surface 12, that is, the printing pressure, can always be maintained at a predetermined pressure. .

Also, without changing the printing pressure as a normal condition, that is, when changing the printing pressure to a “pressure type” method in which the printing pressure is set to a slightly overvalued one and the squeegee is changed, The amount of movement of the air cylinder 2 set so as to apply pressure may be transmitted to the squeegee member 1 as it is. In this case, the contact portion 9a of the stopper member 9 has a predetermined movement of the air cylinder 2. The amount is retracted to a position where the amount is not regulated, and contact with the operating piece 8 is avoided.

Reference numeral 13 in the figure denotes an ink return member which is operated by a power source (not shown) provided separately from the printing pressure applying means 2, and which moves together with the squeegee member 1 for squeezing the screen plate surface 12, 12 screen plates per print process
Scratch back the ink of to the squeegee start position.

"Effects of the present invention" The present invention is configured as described above,
The amount of movement of the power transmission member that transmits the power from the printing pressure applying means to the squeegee member is appropriately changed by adjusting the movement of the stopper member with respect to the stroke of the operating piece attached to the operating rod that interlocks with the power transmission member. Therefore, the displacement formula and the pressure formula for the printing pressure can be easily obtained according to the demand at any time.

[Brief description of drawings]

FIG. 1 is a front perspective view of an essential part of a squeegeeing device portion of a screen printing machine in which the printing pressure setting device of the present invention is implemented, FIG. 2 is a right side view with partial omission in FIG. 1, and FIG. FIG. 2 is a partially omitted A-A sectional view in FIG. 1. DESCRIPTION OF SYMBOLS 1 ... Squeegee member, 2 ... Printing pressure applying means (air cylinder), 3 ... Power transmission member, 4,5 ... Link piece, 6 ... Arm member, 7 ... Operating rod, 8 ... Operating piece, 9 ... Stopper member,
9a ... Abutting part, 11 ... Fastener, 12 ... Screen plate surface, S ... Coil spring, M ... Micrometer, F ... Printing press frame.

Claims (1)

(57) [Claims] 1. A screen printing machine for performing a squeezing process by the action of printing pressure applying means provided on both ends of a squeegee member, wherein power from the printing pressure applying means is provided between the two printing pressure applying means. In addition to installing an operating rod that interlocks with a power transmission member for transmitting to the squeegee member,
A printing pressure setting device for a squeegee member in a screen printing machine, wherein an operating piece facing the stopper member arranged to adjust the movement amount of the power transmission member is attached to the operating rod.