JPS63114649A - Squeegee pressure calibration device - Google Patents

Abstract

PURPOSE:To enable a squeegee pressure to be adjusted while the indication of a squeegee pressure measurement device is observed, by a method wherein a pressure detecting means is provided between a printing amount and a squeegee for the measurement of the squeegee pressure which is to be indicated on an indicating means. CONSTITUTION:A squeegee pressure detector 100 is mounted on a printing mount 40 of a screen printing machine, and a squeegee 50 is mounted on the squeegee pressure detector 100. If pressures F1 and F2 applied to the upper portions of the squeegee 50 are adjusted so that pressures T1-T3 to be applied to pressure detecting elements 30A-30C meet the requirement of T=T1=T2=T3, a squeegee pressure is to be uniformly applied to the squeegee pressure detector 100. An AC signal V1a has been inputted to a comparison circuit 16A from a generator 15A and, therefore, the output values (amplitude values) of a detection signal V3a and the AC signal V1a are compared with each other and the outputted difference signal V4a is inputted to an arithmetic circuit 18A. The arithmetic circuit 18A, in which the relation between the difference signal V4a and the pressure is previously inputted, converts the inputted difference signal V4a to a pressure indication signal V5a and indicates it on an indicator 13A.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a squeegee pressure calibration device most suitable for use in adjusting squeegee pressure in screen printing.

(Technical background of the invention and its problems) Conventionally, in screen printing, a squeegee is applied to the inner surface of a screen plate, maintained at a certain angle (45° to 70°) to the plate surface, and slid while applying pressure. , the ink contained in the screen frame passes through the holes of the screen and is printed on the printing material surface.

However, in order to obtain uniform printed matter in this type of screen printing, it is necessary to adjust the height and pressure of the squeegee before printing. Conventionally, these operations were performed by experienced workers by intuition, and the work was difficult. Adjustment was not uniform due to individual differences.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to provide a squeegee pressure calibration device that can detect squeegee pressure with a squeegee pressure detector and adjust it while observing the display of the squeegee pressure measuring device.

(Summary of the Invention) This invention relates to a squeegee pressure calibration device, in which a piezoelectric film for vibration and a piezoelectric film for pressure sensitivity are layered in screen printing in which a squeegee is used to print on printing paper placed on a printing table. an oscillating means for inputting an alternating current signal to the vibrating piezoelectric film; a comparing means for comparing the output signal generated in the pressure sensitive piezoelectric film and the alternating current signal; and an output value from the comparing means. display means for displaying the squeegee pressure as a squeegee pressure, the pressure detection means is provided sandwiched between the printing table and the squeegee, and the squeegee pressure is adjusted by measuring the squeegee pressure displayed on the display means. It was designed to do so.

(Embodiment of the Invention) FIG. 1 shows the front configuration of a squeegee pressure calibration device which is an embodiment of the present invention, and the squeegee pressure calibration device is composed of a squeegee pressure detector 100 and a squeegee pressure measuring device 10. The squeegee pressure detector 100 detects the squeegee pressure and the squeegee pressure measuring device 1
The squeegee pressure is adjusted while measuring at 0.

The squeegee pressure detector 100 includes a pressure detection element 308.

308.30G is provided, and pressure detection element 30A
Rubber part 5 at the tip of the squeegee 50 placed on ~30C
1 pressure (squeegee pressure) is detected.

Further, the pressure detection elements 30A to 30C are respectively provided with codes 358 to 35C, and detection signals are inputted to the squeegee pressure measuring device 10 by the codes 35A to 35G. A connector 12 is provided on the lower right front side of the squeegee pressure measuring instrument 10, and this connector 12 has pressure detection elements 308 to 30G.
Cords 35A to 35G are connected, and connector 1
A power switch 11 is provided above 2. Indicators (meters in this case) 13A to 13C are provided at the upper front part of the squeegee pressure measuring device 10, and display the pressures applied to the pressure detection elements 308 to 30C. Display 13A
~ Below 13C are zero point adjustment volumes 14A ~ 14C.
is provided for seven-point correction of the displays 13A to 13G.

FIG. 2 shows the structure of the squeegee pressure detector 100,
The squeegee pressure detector 100 includes pressure detection elements 308 to 30.
The pressure detecting elements 30A to 30G are arranged between vibration piezoelectric films 318 to 32G and pressure sensitive piezoelectric films 32A to 32G with a thickness of about 30 μm and polyester films 33A to 33C with a thickness of about 25 μm. It has a sandwich-attached structure, and pressure detection elements 30A to 30G
A polyester film having a thickness of about 38 μm is attached as a protective layer 33, 34 to both sides of the protective layer 33, 34. A piezoelectric film is a film that generates electric charges due to external stress, and also generates distortion when electricity is passed through it. These materials include ceramic and polymer materials. For ceramic systems, pZT (PbTiOt-PbZr03) is used.

PbTiO2, BaTi0. , LiNb0. , crystal, etc. Polyvinylidene fluoride (PV
Typical examples include polyvinylfluoride (PVF), a copolymer of polyvinylidene fluoride and ethylene fluoride. Polymer-based piezoelectric materials (pyroelectric materials) can be made into a thin film by calender molding, casting, etc., and unlike ceramic materials, they are lightweight and have free flexibility. Electrodes (not shown) on which aluminum is vapor-deposited are provided on the front and back surfaces of the piezoelectric films 31A to 31G for vibration and the piezoelectric films 32A to 32G for pressure sensitivity. AC signals Via to Vlc are applied, the vibration piezoelectric films 318 to 31C are driven with amplitude, and the amplitudes transmitted through the polyester films 338 to 33C are converted into electrical signals by the pressure sensitive piezoelectric films 32A to 32G. and output as detection signals V2a to V2c.

FIG. 3 shows the block configuration of the squeegee pressure gear represion installation. Here, the block configuration for measuring the squeegee pressure to the pressure detection element 30 will be explained, but the squeegee pressure of the other pressure detection elements 30B to 30G will be explained. The block for measuring , has a similar configuration. An oscillator 15A is provided in the squeegee pressure measuring device 10, and the oscillator 1
The AC signal Via oscillated at 5^ is sent to the squeegee pressure detector 1.
The detection signal V2a that is input to the vibration piezoelectric film 31A of 00 and generated in the pressure sensitive piezoelectric film 328 is input to the amplifier 17A in the squeegee pressure measuring device 10,
The detection signal V3a amplified in step 8 is input to comparison circuit 168. On the other hand, the AC signal Via is input from the oscillator 15A to the comparison circuit 15A, and the above detection signal V3a
The output value (amplitude value) of the AC signal Via and the output value (amplitude value) of the AC signal Via are compared, and the output difference signal V4a is input to the arithmetic circuit 18A. The relationship between the difference signal V4a and the pressure is input into the calculation circuit 18A in advance, and the calculation circuit 188 converts the input difference signal V4a into a display signal V5a representing pressure based on the above data and displays it. input to the display 13A,
A pressure value is displayed. Moreover, in the arithmetic circuit 18A;
A point adjustment volume 14A is connected, and the display 13
The pressure value displayed at ^ is adjusted.

FIG. 4 shows the relationship between the squeegee pressure detector 100 and the squeegee 50.
A squeegee pressure detector 100 is placed on the squeegee pressure detector 100, and a squeegee 50 is placed on the squeegee pressure detector 100. Pressures Fl and F2 are applied to the upper part of the squeegee 50, and the pressure detection elements 30A to 30 of the squeegee pressure detector 100 are applied from the rubber part 51 of the squeegee 50.
Pressures T1 to T3 are applied to C, respectively. Therefore, the pressures Fl and F2 at the upper part of the squeegee 50 are adjusted as shown in the figure, and the pressure T applied to the pressure detection elements 308 to 30C is
It can be seen that if 1 to T3 are set as T-Tl-T2.T3, the squeegee pressure applied to the squeegee pressure detector 100 becomes uniform. Therefore, if printing paper is inserted instead of the squeegee pressure detector 100 after adjustment, the same result will be obtained.

FIG. 5 shows an example in which the squeegee pressure calibration device is mounted on a screen printing machine. Here, a squeegee 50 is attached to the screen printing machine, and a squeegee pressure detector 100 is inserted between the squeegee 50 and the printing table 40. ing. The squeegee 50 is fixed by a squeegee fixing member 42 of the screen printing machine, and squeegee height adjustment knobs 43A and 43B are provided on the left and right sides of the squeegee fixing member 42,
The squeegee pressure on the left and right sides of the squeegee 50 is adjusted. Furthermore, the squeegee fixing member 42 is provided with a squeegee adjustment knob (not shown), and the squeegee pressure can be adjusted so that the squeegee pressure is evenly applied to the entire squeegee 50.

In such a configuration, a method of using the squeegee pressure calibration device will be described.

First, an operator connects the connector 12 to the squeegee pressure measuring device 10, places the squeegee pressure detector 100 on a separately prepared stand, etc., and turns on the power switch 11 of the squeegee pressure measuring device 10. Then, when the pressure detecting elements 30^ to 30C of the squeegee pressure detector 100 are applied with the optimum pressure (for example, 10 Kg/am2) for the squeegee of the screen printing machine, for example, the pressure detecting element 30A is as described in FIG. Then, the above pressure is added to the amplitude of the vibrating piezoelectric film 31A, which is amplitude-driven by the AC signal Via input from the oscillator 15A in the squeegee pressure measuring device IO, and the pressure-sensitive piezoelectric film 32A changes due to the pressure. Detection signal V2. is generated, and this detection signal V2a is sent to the amplifier 17A.
input and amplified? ! ) l 7 Detection signal V3 from A
a is input to the comparator circuit 16A, and the difference signal V4a is input from the comparator circuit 16^ to the arithmetic circuit 188, and the arithmetic port 1i1
The display signal V5a is inputted to the display 13A from 8188, and the pressure applied to the pressure detection element 30 is displayed on the display 13A. In addition, the other pressure detection elements 30B and 30C are similarly connected to the indicators 138 to 13C of the squeegee pressure measuring device 10.
Since the pressure is displayed, turn the ink point adjustment volume 14A-1
Adjust 4c until the displayed pressure value is 0. This sets the pressure so that it is negative (-) when the pressure is low, and positive (+) when the pressure is higher.

Next, insert the squeegee pressure detector 100 between the squeegee 50 and printing table 40 of the screen printing machine, put the squeegee in a printing state (a state in which pressure is applied to the squeegee), and adjust the squeegee height adjustment knobs 43A and 43B. Display device 13A~
When the displayed value of 13G is adjusted to 0, the pressure applied to the left and right sides of the squeegee pressure detector 100 becomes uniform as explained in FIG. 4, and the squeegee is adjusted to the optimum pressure for printing. Therefore, the screen printing machine is brought to a printing completion state, and the squeegee pressure detector 100 is removed. With the above adjustment, the desired squeegee pressure can be obtained, so when the screen printing machine is put into the printing state and the printing paper is jetted and printing is performed, good printing can be immediately obtained.

(Effects of the Invention) According to the squeegee pressure calibration device of the present invention, the squeegee pressure can be adjusted while being measured by the display, so there is no individual difference among workers, and anyone can easily and quickly adjust the squeegee pressure. This has the effect that the squeegee pressure can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is a front view of a squeegee pressure calibration device that is an embodiment of the present invention, Fig. 2 is a structural diagram of a squeegee sill detector, Fig. 3 is a block diagram of the squeegee pressure calibration device, and Fig. 4 is a FIG. 5 is a diagram showing the relationship between the squeegee and the squeegee pressure detector, and is a diagram showing an example of implementation of the squeegee pressure gear represion device. 10... Squeegee pressure measuring device, 11... Power switch, 12... Connector, 13A to 13G... Display device,
14A~14G...7 point adjustment volume, 30A~3
oc...pressure detection element, 33.34...protective layer, 5
0... Squeegee, 100... Squeegee pressure detector. 3oc, mt at3A 4rshigu shi≦1 Tea 2 figure

Claims (1)

[Claims] In screen printing in which printing is performed using a squeegee on printing paper placed on a printing table, a pressure detection means is provided in which a vibrating piezoelectric film and a pressure-sensitive piezoelectric film are layered, and an alternating current signal is input to the vibrating piezoelectric film. oscillation means, comparison means for comparing the output signal generated in the pressure-sensitive piezoelectric film and the alternating current signal, display means for displaying the output value from the comparison means as squeegee pressure, and the pressure detection means A squeegee pressure calibration device, characterized in that the squeegee pressure calibration device is provided sandwiched between the printing table and the squeegee to adjust the squeegee pressure displayed on the display means.