JPH0776064A - Textile printing base of rotary screen textile printing press - Google Patents

Abstract

PURPOSE: To finish a printing table to have an extremely simple-non-bulky structure in which an effective traction is ensured by generating a relatively strong field. CONSTITUTION: A rotary screen printing table comprises a pair of spaced apart parallel standing girders 11, 11', a third girder 12 movable therebetween in the vertical direction, at least a pair of permanent magnets 15 boron on top of the girder 12, and a buffering cover 10 covering both girders 11, 11' and the space integrally from above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing table of a rotary screen printing machine, and more particularly to a printing table having a magnet.

[0002]

2. Description of the Related Art It has been known to print a long woven cloth or other soft material wound around a bobbin with a rotary screen printing machine. This type of printing machine has a horizontally supported horizontal drum, on which a printing screen with the pattern to be printed is held. The printing ink guided in the horizontal drum is pressed against the surface of the printing screen by a roll-shaped squeegee, passes through and is extruded from the back surface. The roll-shaped squeegee comes into contact with the inner peripheral surface of the cylindrical printing screen held on the drum, and rotates following the rotation of the drum. The fabric to be printed is
At the lower position of the horizontal drum, it is advanced by the flexible conveying means which slides on the textile printing table. The printing table is
The roll-shaped squeegee is made of a ferromagnetic metal and is pulled from below. To be deceptive, the printing ink is pressed from above by a roll-shaped squeegee subjected to a magnetic pulling force, passes through the mesh of the printing screen, and is extruded from the back surface. The printing ink then penetrates into the fabric and finally the desired printing is carried out.

When an electromagnet is used on the side of the textile printing table to draw the roll-shaped squeegee, there is an advantage that the magnetic traction force can be easily interrupted by simply cutting off the electric power. Such a shut-off operation is required every time the roll-shaped squeegee or the printing screen is replaced, and is frequently performed, so that it is easy to do.

[0004]

However, when the electromagnet is used, the traction force acting on the roll-shaped squeegee is strong enough to cause the roll-shaped squeegee to mechanically press the printing ink and penetrate the thick fabric. There was a drawback that it was not. For this reason, it is conceivable to increase the traction force by using a large size powerful electromagnet, but this solution leaves a problem in the installation space. In addition, the electromagnet consumes a considerable amount of power and is subject to thermal deformation during operation, which has a negative effect on the printing accuracy.

Therefore, a main object of the present invention is to provide a printing table of a rotary screen printing machine which does not have the above-mentioned drawbacks.

[0006]

In order to achieve the above object, in a printing table comprising a magnet-embedded support block standing upright in a transverse direction, a magnet is composed of at least two permanent magnets. The permanent magnet is held on the upper surface of a vertically movable intermediate moving block body interposed between a pair of parallel front and rear supporting block bodies, and is formed by a thin plate made of a non-magnetic alloy having high mechanical strength. The support cover adopts a configuration in which the upper portions of the front and rear support block bodies are collectively wrapped and covered.

[0007]

When the printing process must be interrupted to replace the printing screen or the like, the intermediate moving block body is prevented from being affected by the magnetic field generated by the permanent magnet held on the upper surface of the intermediate moving block body. Is moved downward and backward, but at this time, the covering support cover prevents the woven cloth and the printing pad from displacing downward due to the weight of the printing drum.

In addition, even when the intermediate moving block is moved upward during the printing process to exert the pulling action by the permanent magnet on the upper surface, the support cover is made of a thin plate made of a non-magnetic alloy, so that it is permanent. It does not excessively reduce the pulling action of the magnet.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, a printing drum designated by reference numeral 1 and a cylindrical printing screen held by the drum rotate in a direction indicated by an arrow 2 and an inner peripheral surface of the printing screen 1 is rotated. The roll-shaped squeegee 4 arranged so as to come into contact with is rotated in the direction of arrow 5 as the printing drum 1 rotates. The printing ink 3 is guided inside the printing drum and sprayed onto the inner peripheral surface of the printing screen 1 to be attached thereto. The woven fabric 6 or other similar fabric to be printed is advanced by a printing pad 7 which functions as a transport means. The printing pad is indicated by the arrow 8
Move in the direction shown in.

Although the above-mentioned structure is the same as that of the prior art, it is a printing processing table which constitutes a novel part of the present invention in FIG. 1, and the printing processing table will be described in detail below. . The textile printing table is provided with a pair of support block bodies 11 and 11 'standing upright in parallel to the transverse direction and spaced apart from each other in the front-rear direction, and a third intermediate portion provided so as to be vertically movable in a space between these support block bodies. It comprises a moving block body 12 and a support cover 10 that covers the upper portions of the support block bodies 11 and 11 '. At least two permanent magnets 15 are held on the upper surface of the intermediate moving block body 12.
The pair of front and rear support blocks 11 and 11 'and the intermediate moving block 12 are made of the same material as the block of the known printing table, but have a thickness of about 1/3.

The support cover 10 is formed in a box shape by using a thin plate made of a non-magnetic alloy, and covers the upper portions of the front and rear support block bodies 11 and 11 'by enclosing them together. The permanent magnet 15 is immovably fixed to the upper surface of the intermediate block body 12 by a known method by a holding and bending plate 12A. The number of permanent magnets 15 is determined according to the width of the block body and the length of the roll-shaped squeegee 4. However, the total length of all the magnets must be proportional to at least the length of the roll-shaped squeegee 4. The thicknesses of the permanent magnets 15 and the intermediate block body 12 are 16 to 25 so that the roll-shaped squeegee 4 is reliably positioned in the transverse direction.
Values in the range of mm are preferred.

The intermediate moving block body 12 is actuated by a known means (not shown) and can move vertically as shown by an arrow 13 or 14. Along with the movement of the intermediate moving block body 12 in the upward direction of the arrow 13, the permanent magnet fixed to the upper surface of the intermediate block body reaches a position extremely close to the roll-shaped squeegee 4. Deceive,
The rolled squeegee is affected by the magnetic field generated by the permanent magnet 15. When the roll-shaped squeegee 4 is thus affected by the magnetic field, the printing ink is pressed from above and passes through the mesh of the printing screen 1 held on the printing drum,
It penetrates into the printing material 6. On the other hand, when such a printing process has to be interrupted, for example when the roll squeegee is replaced, the intermediate moving block body 12 is generated in the downward direction of the arrow 14 away from the roll squeegee 4, that is, from the permanent magnet 15. The squeegee 4 is not affected by the magnetic field generated by the squeegee 4.

Referring to FIG. 2, the plurality of permanent magnets 15 are
They are fixed to the upper surface of the intermediate moving block body 12 adjacent to each other, and are arranged so as to exert a pulling force uniformly over the entire length of the roll-shaped squeegee 4. These permanent magnets 1
5 has a strong magnetic force, for example, neodymium (Nd) element,
An alloy of iron (Fe) and boron (B) has been selected. The adjoining distance of the plurality of permanent magnets 15 is in the range of 30 to 40 mm in relation to the diameter and rigidity of the roll-shaped squeegee so that the pressing force by the roll-shaped squeegee acts reliably at a constant pressure across the width of the woven cloth. Values within are preferred.

The supporting cover 10 is an important component in the textile printing table according to the present invention. In the support cover 10, when the intermediate moving block body 12 is retracted in the downward direction of the arrow 14, that is, in the direction away from the roll-shaped squeegee 4, the area occupied by the permanent magnet 15 appears as a space. The support cover 10 is significant in the scene. That is, the support cover 10 prevents the printing pad and the woven fabric 6 pressed by the weight of the printing drum 1 from being pushed into the appearance space. This is because the downward displacement of the printing drum 1, the woven fabric 6 and the printing pad 7 adversely affects the function of the printing machine and the quality of the printing result.

The support cover 10 is made of a non-magnetic alloy so as not to be affected by the magnetic field generated by the permanent magnet 15. The metal plate forming the support cover 10 preferably has an extremely thin thickness so as not to excessively reduce the pulling action of the permanent magnet 15 located below the adhered support cover. However, the supporting cover-constituting metal plate needs to be selected to have an appropriate thickness so as to prevent the printing drum 1 and the roll-shaped squeegee 4 from being deformed by the weight. As a condition satisfying such conditions, for example, 1.8 to 2.0
% Beryllium (Be) element, 0.2% or more cobalt (Co) element, about 0.02% nickel (Ni) element,
And a 0.3 mm thick metal plate made of a special copper alloy containing about 0.04% iron (Fe) element.

The printing table according to the present invention has an extremely simple and non-bulky structure, and can generate a stronger magnetic field as compared with the printing table having the same size electromagnet. The roll-shaped squeegee 4 is uniformly pulled over the entire length, and therefore does not vibrate.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal section view of a textile printing table according to the present invention in an operating state.

FIG. 2 is a schematic cross-sectional view of the textile printing processing table in an operating state.

[Explanation of symbols]

 1 Printing Drum and Printing Screen 3 Printing Ink 4 Roll Squeegee 6 Woven Fabric 7 Printing Pad 10 Support Cover 11 Support Block 11 'Support Block 12 Intermediate Moving Block 12A Holding Bending Plate 15 Permanent Magnet

Claims (4)

[Claims] 1. A pair of support block bodies (11, 11 ') standing apart from each other and standing in parallel, and an intermediate moving block body (12) interposed between these support block bodies so as to be vertically movable. A plurality of permanent magnets (15) held on the upper surface of the intermediate moving block body, the supporting blocks (11, 11 ') and the supporting space collectively covering the separated spaces from above. A printing table of a rotary screen printing machine characterized by being composed of (10). 2. The support cover (10) is made of beryllium,
The printing table of a rotary screen printing machine according to claim 1, which is formed by a thin plate of a copper alloy containing cobalt, nickel and iron. 3. The support cover (10) comprises 1.8-2.
0% beryllium, 0.2% or more cobalt, 0.02
A printing table of a rotary screen printing machine according to claim 1, characterized in that it is formed by a thin plate of a copper alloy having a thickness of about 0.3 mm, containing a copper alloy containing 10% nickel and 0.04% iron. 4. The neodymium (N) is used as the permanent magnet (15).
d) of a strong magnetic type formed by an alloy of iron and boron.
Or the printing process table of the rotary screen printing machine according to 2.