JPH08197715A - Apparatus for measuring pushing pressure of squeezee in screen printing machine - Google Patents

Abstract

PURPOSE: To obtain accurately the pushing pressure being close to an actual condition by providing a pressure-sensitive sensor sheet which is placed on a printing table and receives a squeezee pushing pressure, and a processing means for processing the pressure information from the pressure-sensitive sensor sheet. CONSTITUTION: When a screen printing machine is adjusted before it is started, a pressure-sensitive sensor sheet 30 is positioned on a material to be printed on a printing table or instead of the material to be printed and a squeezee is brought into press- contact with this. The pressure-sensitive sensor sheet 30 detects pressures at a number of measuring points obtd. by each row and each line and these pressure informations are output to a controller 35. The controller 35 compares the pressure informations from the pressure-sensitive sensor sheet 30 with a set electric voltage to operate a set pressure data, and displays graphically the pressure at each selective measuring position on a displaying screen 34a of a graphic operating panel 34 based on the operation result. After an operator controls a pushing pressure reducing valve 26 while the displaying screen 34a and a pressure gauge 26a are watched, a desired pressure value is obtained by adjusting the pushing pressure reducing valve 27 while the displaying screen 34a and the pressure gauge 27a are being observed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeegee printing pressure measuring device in a screen printing machine.

[0002]

2. Description of the Related Art In a conventional squeegee printing pressure measuring device, a sensor is provided in a printing pressure device in a squeegee supporting device, and the printing pressure is indirectly measured by the sensor.

[0003]

However, since the printing pressure is measured by the sensor in the printing pressure device, how much printing pressure is actually generated on the printed matter due to the bending of the squeegee rubber and the like. Can't grasp exactly. Further, since the number of sensors is limited by the structure of the printing pressure device, the number of measurement positions is limited, and the printing pressure state cannot be accurately grasped.

An object of the present invention is to provide a squeegee printing pressure measuring device which can accurately grasp printing pressure close to an actual state by using a pressure sensitive sensor sheet which is not related to the squeegee printing pressure device.

[0005]

As shown in the drawings of the embodiments described below, in the screen printing machine according to the first to third inventions, the squeegee (21) is pressed against the plate surface (2a). The squeegee (21) and the plate surface (2a) move relative to each other, and the printing material (W) on the printing table (1) is printed.

In the squeegee printing pressure measuring device according to the first invention, a pressure sensitive sensor sheet (30) placed on the printing table (1) to receive the squeegee printing pressure, and the pressure sensitive sensor sheet (30). Means (35) for processing the pressure information of

In the squeegee printing pressure measuring device according to the second invention, a display section (34a) for displaying the squeegee printing pressure.
A pressure-sensitive sensor sheet (30) placed on the printing table (1) to receive squeegee printing pressure, and a calculation unit (35) for calculating pressure data based on pressure information from the pressure-sensitive sensor sheet (30). ) And a control unit (35) for displaying pressure on the display unit (34a) based on the pressure data from the calculation unit (35).

In the squeegee printing pressure measuring device according to the third invention, the squeegee printing pressure setting giving means (P) and the pressure sensitive sensor sheet (30) placed on the printing table (1) to receive the squeegee printing pressure. And a computing unit (35) for computing pressure data based on the pressure information from the pressure sensitive sensor sheet (30), and the squeegee printing pressure setting giving means (P) based on the pressure data from the computing unit (35). And a control unit (35) for setting the squeegee printing pressure.

[0009]

In the first aspect of the invention, the pressure information from the pressure sensitive sensor sheet (30) placed on the printing pressure table (1) is processed by the processing means (35).

In the second invention, the display means (34a) is provided by the processing means (calculating section 35 and control section 35) of the first invention.
The pressure is displayed on. In the third invention, the squeegee printing pressure is set in the squeegee printing pressure setting imparting means (P) by the processing means (the calculation unit 35 and the control unit 35) of the first invention.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A squeegee printing pressure measuring device for a screen printing machine according to a first embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1, 2, and 4, the print object W is positioned on the print table 1 which is vertically movable,
The screen printing plate 2 is fixed above it. The movable support plate 3 is provided above the screen printing plate 2 with the guide frame 37.
Is supported by a driving mechanism (not shown) along the plate surface 2a of the screen printing plate 2 in the front-back direction (see FIGS. 1, 6, 7).
It reciprocates in the direction of arrow A). Figure 5
As shown in FIG. 3, the bracket 3 supported at the center of the movable support plate 3 in the left-right direction (the direction orthogonal to the front-back direction A).
In a, the squeegee support device 4 is attached to the front side thereof, and the doctor support device 5 is attached to the rear side thereof.

In the squeegee support device 4, as shown in FIGS. 4 and 5, a pair of left and right component weight balance air cylinders 6 (hereinafter also referred to as balance cylinders) and a squeegee printing pressure setting air cylinder 7 between them ( Hereinafter, also referred to as a printing pressure cylinder) and a movable connecting body 8 connected to each of the air cylinders 6 and 7 (actuator or fluid actuator or fluid cylinder).

In the balance cylinder 6, as shown in FIG.
As shown in FIG. 3, the cylinder tube 9 is attached to the bracket 3a, and the piston 10 is vertically movably inserted into the cylinder tube 9 so that the connecting portion 10 of the piston 10 is connected.
a is exposed to the outside of the cylinder tube 9. In the cylinder tube 9, an upward movement pressure chamber 11 and a downward movement pressure chamber 12 are defined by the piston 10 as a boundary. When air is supplied to the upward movement pressure chamber 11, the piston 10 moves upward, and when air is supplied to the downward movement pressure chamber 12, the piston 10 moves downward. The movable connecting body 8 is attached to the connecting portion 10a of these pistons 10.

In the printing cylinder 7, as shown in FIG. 7, a cylinder tube 13 is attached to a bracket 3a, and a piston 14 is vertically movably inserted into the cylinder tube 13. Piston 1
A piston rod 15 extending downward from No. 4 projects to the outside of the cylinder tube 13 and is attached to the movable connecting body 8. In the cylinder tube 13, there is a piston 14
The upper moving pressure chamber 16 on the piston rod 15 side
And a downward movement pressure chamber 17 on the piston 14 side. Squeegee suspension rods 18b are screwed to support cylinders 18a on both left and right sides of the movable connecting body 8 adjacent to the left and right balance cylinders 6 so as to be vertically movable by using male and female screws. A squeegee mounting arm 19 is attached to the lower end of 18b. This movable connecting body 8
A squeegee height adjusting knob 20 is mounted on the upper left and right ends of the squeegee, and the knob 20 can be rotated to finely adjust the vertical movement position of the squeegee suspension rod 18b.

In the squeegee 21, the both mounting arms 1 are
A squeegee mounting body 22 is installed between 9 and the mounting body 22
The squeegee holder 23 is inserted into and fixed to the squeegee holder 23 with a tightening screw 22a.
A plate-shaped squeegee rubber 24 is fitted on the lower side.

As shown in FIG. 8, the air supply source 25 is provided with both the balance cylinders 6 through a component weight balance adjusting pressure reducing valve 26 (hereinafter also referred to as a balance pressure reducing valve) as a pressure control valve for keeping the fluid pressure constant. Is connected to the upward movement pressure chamber 11. Further, the air supply source 25 is connected to the printing pressure cylinder 7 via a squeegee holder printing pressure adjusting pressure reducing valve 27 (hereinafter also referred to as printing pressure reducing valve) as a pressure control valve and a squeegee switching electromagnetic valve 28 (5 port 2 position). It is connected to the.
When the solenoid valve 28 is switched to the 28a position, air is supplied to the lower pressure chamber 17 of the printing cylinder 7 and air in the upper pressure chamber 16 is discharged to the atmosphere, so that the piston 14 and the piston rod 15 are released. Moves down. When the solenoid valve 28 is switched to the 28b position, the printing cylinder 7
Air is supplied to the upward movement pressure chamber 16 and air in the downward movement pressure chamber 17 is released to the atmosphere, so that the piston 1
4 and piston rod 15 move up. Printing pressure reducing valve 27
Is adjusted, the air pressure in the lower pressure chamber 17 of the printing pressure cylinder 7 changes, and the squeegee printing pressure is adjusted. When the balance pressure reducing valve 26 is adjusted, the air pressure in the upward movement pressure chamber 11 of the balance cylinder 6 changes, and the upward power generated in the piston 10 by the air pressure and the weight of each part of the squeegee support device 4 and the squeegee 21 cause the piston 10 to move. It is possible to balance the lower power that occurs in the. As described above, when the piston rod 15 of the printing cylinder 7 moves up and down, the piston 10 of the balance cylinder 6 moves up and down following the movable connecting body 8 of the squeegee support device 4 while maintaining the balance. The squeegee 21 follows the movement.

In the doctor support device 5, FIG.
7 to 7, the squeegee printing pressure setting air cylinder 7 of the squeegee support device 4 is omitted, and the squeegee holder 23 and the squeegee rubber 24 of the squeegee 21 are omitted.
It has the same structure as the squeegee support device 4 except that a doctor 29 is attached instead. Therefore, the squeegee support device 4 is attached to the doctor support device 5 as a number.
Quote the number.

As shown in FIGS. 1 and 2, the pressure-sensitive sensor sheet 30 shown in FIGS. 3 and 8 is positioned on the printed material W or in place of the printed material W at the time of adjustment before operating the screen printing machine. The sensor portion 31 of the pressure-sensitive sensor sheet 30
Is connected via a connector 32 and a cable 33 to a controller 35 (calculation unit and control unit as processing means) in the graphic operation panel 34. The pressure-sensitive sensor sheet 30 is formed by forming a pressure-sensitive resistive material in a thin film on a polyester sheet to form a sensor unit 31, and has a large number of measurement positions (for example, 4 lines in each row) determined by each column and each row.
The pressure is detected by the column, and the pressure information (voltage change due to printing pressure) is output to the controller 35. Controller 35
Stores the set pressure data for each set voltage,
The set pressure data is calculated by comparing the pressure information from the pressure sensitive sensor sheet 30 with the set voltage, and each selected measurement position is displayed on the display screen 34a (display section) of the graphic operation panel 34 based on the calculated set pressure data. The pressure at is displayed as a graph.

After the operator mounts the pressure sensitive sensor sheet 30 on the printing pressure table 1 and presses the squeegee 21 against it, the balance pressure reducing valve 26 is adjusted while observing the pressure display on the display screen 34a and the pressure gauge 26a. While adjusting the printing pressure reducing valve 27 while observing the pressure display on the display screen 34a and the pressure gauge 27a, the display pressure on the display screen 34a is set to a desired value. In that case, the squeegee height adjusting knob 20 is operated to finely operate the squeegee rubber 24 to make the pressures at the selected measurement positions substantially the same.

The first embodiment has the following characteristics (a) to (d). (A) Since the pressure-sensitive sensor sheet 30 which is not related to the squeegee printing pressure device is placed on the printing pressure table 1 and used for printing pressure measurement, the printing pressure close to the actual state can be accurately grasped.

(B) The pressure information from the pressure-sensitive sensor sheet 30 can be processed by the controller 35 and effectively used for various controls such as pressure display on the display screen 34a.

(C) When the pressure information from the pressure-sensitive sensor sheet 30 is processed by the controller 35 and used for the pressure display of the display screen 34a, the operator sets the printing pressure while watching the pressure display. It can be done easily.

(D) The pressure-sensitive sensor sheet 30 detects pressure at a large number of measurement positions determined by each column and each row, and outputs the pressure information to the controller 35. Therefore, the printing pressure is measured at many selected measurement positions,
The squeegee printing pressure can be averaged based on the measured printing pressure.

Besides the first embodiment, the following (a) to
It may be configured as in (b). (A) In the first embodiment, the adjustment spring type squeegee printing pressure adjusting pressure reducing valve 27 and the squeegee height adjusting knob 20 are manually adjusted. In the second embodiment, as shown in FIG. 9, the squeegee height adjusting knob 20 is changed to an electromagnetic squeegee printing pressure adjusting pressure reducing valve 27 that proportionally controls the air pressure by an electric signal, and the squeegee height adjusting knob 20 is changed. 36
Change to In this case, the support cylinder portion 1 of the movable connecting body 8
8a, the squeegee suspension rod 18b, and the squeegee height adjusting electric motor 36, and the squeegee printing pressure setting air cylinder 7, the squeegee switching electromagnetic valve 28, and the electromagnetic squeegee printing pressure adjusting pressure reducing valve 27, respectively. The pressure setting applying means P is configured. In the automatic mode, the controller 35 (processing means) stores the set printing pressure data of the electromagnetic printing pressure reducing valve 27 for each set voltage, and the specific setting voltage inputted by the operator and the pressure sensitive sensor sheet 30. The set printing pressure data is calculated by comparing with the pressure information from, and the electromagnetic printing pressure reducing valve 27 is feedback-controlled based on the calculated setting printing pressure data. Further, the controller 35 (processing means) feedback-controls the squeegee height adjusting electric motor 36 so that the pressure information from the pressure-sensitive sensor sheet 30 matches each other at each selected measurement position, and thereby each selected measurement position. The pressures at are almost the same. Therefore, accurate printing pressure can be set automatically.

(B) In addition to the flat screen printing machine of the above-mentioned embodiment, various other flat screen printing machines, for example, a cylinder press system (the printing table 1 corresponds to a cylinder) which is one of them, and various curved screens. The present invention is used for setting the squeegee printing pressure of a printing machine.

[0027]

According to the squeegee printing pressure measuring device of the screen printing machine of the first invention, the pressure-sensitive sensor sheet (3
Since 0) is placed on the printing pressure table (1) and used for printing pressure measurement, the printing pressure close to the actual state can be accurately grasped. Further, the pressure information from the pressure sensitive sensor sheet (30) can be processed by the processing means (35) and can be effectively used for various controls.

According to the second invention, in addition to the effect of the first invention, in particular, the operator can easily and accurately set the printing pressure while observing the pressure display on the display section (34a).
According to the third invention, in addition to the effect of the first invention, in particular, the printing pressure close to the actual state can be accurately set in the printing pressure setting applying means (P).

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a screen printing machine according to a first embodiment.

FIG. 2 is a partially cutaway front view of the same.

3 (a) is a sectional view taken along line XX of FIG.
(B) is a partial plan view showing only the pressure-sensitive sensor sheet.

FIG. 4 is a partial front view showing a squeegee support device of a screen printing machine.

FIG. 5 is a partial plan view of FIG.

6 is a partial cross-sectional view taken along line YY of FIG.

7 is a partial sectional view taken along line ZZ of FIG.

FIG. 8 is an electric block circuit diagram and an air pressure circuit diagram according to the first embodiment.

FIG. 9 is an electric block circuit diagram and an air pressure circuit diagram according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printing table, 2 ... Screen printing plate, 2a ... Plate surface, 21 ... Squeegee, 30 ... Pressure sensor sheet, 34a
... Display screen as display unit, 35 ... Controller as processing means that is arithmetic unit and control unit, W ... Printed material.

Claims (3)

[Claims] 1. A squeegee (21) is pressed against the plate surface (2a), and the squeegee (21) and the plate surface (2a) are relatively moved to print on an object (W) to be printed on the printing table (1). In a screen printing machine for applying, a pressure-sensitive sensor sheet (30) placed on the printing table (1) and receiving squeegee printing pressure, and a means (35) for processing pressure information from the pressure-sensitive sensor sheet (30). ) A squeegee printing pressure measuring device in a screen printing machine, comprising: 2. The squeegee (21) and the plate surface (2a) are relatively moved in a state where the squeegee (21) is in pressure contact with the plate surface (2a) to print on an object (W) to be printed on the printing table (1). In a screen printing machine for applying, a display unit (34a) for displaying a squeegee printing pressure, a pressure sensitive sensor sheet (30) placed on the printing table (1) to receive the squeegee printing pressure, and the pressure sensitive sensor sheet. A calculation unit (35) for calculating pressure data based on the pressure information from (30) and a control unit (35) for displaying pressure on the display unit (34a) based on the pressure data from the calculation unit (35). A squeegee printing pressure measuring device for a screen printing machine, which is characterized by being provided. 3. The squeegee (21) and the plate surface (2a) are moved relative to each other in a state where the squeegee (21) is pressed against the plate surface (2a) to print on an object (W) to be printed on the printing table (1). In a screen printing machine for applying, a squeegee printing pressure setting giving means (P), a pressure sensitive sensor sheet (30) placed on the printing table (1) to receive the squeegee printing pressure, and the pressure sensitive sensor sheet (30). ) A calculation unit (35) for calculating pressure data based on the pressure information from the calculation unit, and a control unit for setting the squeegee printing pressure in the squeegee printing pressure setting giving unit (P) based on the pressure data from the calculation unit (35). (35) A squeegee printing pressure measuring device in a screen printing machine, comprising: