JPH01110148A - Printing surface grinding device of printed matter - Google Patents

Abstract

PURPOSE:To enable a telephone card to be used again by grinding a printing surface thereof the prepare a clean surface by a method wherein a plurality of sets of rotary grinding materials in a progressive direction of printed matter, a rotary speed of, at least, one set of the rotary grinding material is rotated slower than others, and cooling water is supplied to the rotary grinding material. CONSTITUTION:Surfaces of rotary grinding materials 3A, 4A, 5A are lined with abrasives. In order to remove a printed surface of printed matter 1, a particle sizes of abrasive of the rotary grinding material 3A on the first stage is coarsened. In order to uniformize the peinted surface, particle size of the rotary grinding materials 4A, 5A on the second and third stages are successively fined. Further, a rotary speed of the rotary grinding material 3A on the first stage is made quick, and the rotary speeds of the rotary grinding materials 4A and 5A on the second and third stages are made successively slower in a progressive direction F. Further, cooling water W is sprayed from a cooling water shower 6 on a surface of each rotary grinding material, and a doctor 7 for removing grinding refuse is established to thoroughly remove the grinding refuse.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention involves removing the printed surface of a printed matter with a coarse abrasive, and then erasing the print on the printed surface with a fine abrasive. This invention relates to a printing surface grinding machine for printed matter that produces a uniform finished surface.

[Prior art]

In recent years, it has become necessary to remove the printed part of the surface of telephone cards, etc. by grinding and reuse them.In this case, it is possible to remove the printed part of the surface of very thin printed matter and reuse the ground surface. Finished with a clean surface,
In addition, it is necessary to completely remove grinding slag from the printed portion on the scraped surface.

Further, the surface grinding work in this case is required to be performed continuously and quickly in order to improve efficiency.

[Purpose of the invention]

The present invention was made in response to the above-mentioned demands, and it is capable of continuously and quickly grinding the printed surface of printed matter such as a telephone card, and also makes the surface after grinding clean and uniform without the adhesion of grinding slag. The purpose of this invention is to provide a printing surface grinding machine for printed matter that can be finished to a polished surface.

[Structure of the invention]

The printing surface grinding machine for printed matter to achieve the above purpose is
A plurality of sets of cylindrical rotary grinding bodies having an abrasive material such as diamond, silicon carbide, carbon random, etc. on their surfaces are arranged in the traveling direction of the printed matter fed by a conveying roller, etc. It is characterized by rotating at a slower speed than the others, supplying cooling water such as a cooling water shower to the surface of each rotary grinding body, and removing grinding slag with a doctor or brush. be.

This printed matter grinding machine with the above configuration sequentially and continuously grinds the printed surface of the supplied printed matter by distributing an abrasive material on the surface of each rotary grinding body, and finally achieves a uniform surface with no adhesion of grinding slag. This results in printed matter with a clean finished surface without any scratches.

〔Example〕

The present invention will be described in detail below with reference to the drawings, which are schematic side views of essential parts of a printing surface grinding machine for printed matter according to an embodiment of the present invention.

First, this printing surface grinding machine includes a plurality of groups of conveying rollers 2 that can supply printed matter 1 in the direction of movement indicated by the arrow F, and a plurality of groups of conveying rollers 2 between each group of conveying rollers 2. That is, in this embodiment, three sets of cylindrical rotary grinding bodies 3A, 4A, and 5A are arranged in the traveling direction F, and a printed telephone card is applied to the printed matter 1.

Therefore, the interval LA between the conveying rollers 2 of each set is set shorter than the length l of this printed matter 1, and the interval between the rotary grinding bodies 3A and 4A of each set, and the interval between 4A and 5A. The interval LC is set longer than the length l of the printed matter 1.

Next, each of the above-mentioned sets of rotary grinding bodies 3A, 4A.

The surface of 5A is lined with an abrasive material such as diamond, silicon carbide, or carborundum, and 1
The purpose of the step 3A, or the first step 3A and the second step 4A is to remove the printed surface of the printed matter 1, so the grain size of the abrasive is coarsened to, for example, 230, and the second step eye,
The rotary grinding bodies 4A and 5A in the third stage are used to make the printing surface of the printed matter uniform, so the abrasive material is, for example, 400
The numbers are sequentially divided into numbers such as number, 600, etc.

Regarding the rotation speed, the first stage rotary grinding body 3A
is set at a fast speed of about 2000 RPM, for example, and the rotational speeds of the second and third stage rotary grinding bodies 4A and 5A are made to gradually decrease in the traveling direction F. The rotational speed of the conveyance roller 2 can be adjusted so that it is always faster than the conveyance speed of the conveyance roller 2.

In addition, in the above embodiment, the upper rotary grinding bodies 3A, 4A,
5A is made faster than the rotation speed of conveyance rollers 3B, 4B, and 5B, and the rotating grinding bodies 3A, 4A, and 5
An abrasive material is used on the surface of A, but the lower conveyance roller 3B.

4B and 5B are relatively elastic, and are set at the same speed as the transport speed of the transport roller 2.

Further, the upper rotary grinding bodies 3A, 4A, and 5A may be rotated in the normal direction as shown by the solid line in the figure, or may be rotated in the reverse direction as shown by the broken line.

Furthermore, cooling water W is sprayed from the cooling water shower 6 onto the surfaces of the rotary grinding bodies 3A, 4A, and 5A, to provide a cleaning effect and a cooling effect during grinding of the surfaces.
Further, a doctor 7 or a brush for removing grinding slag is provided to completely remove the grinding slag.

On the other hand, according to the experimental results of the present inventors, rotary grinding bodies 3A, 4
When the rotational speed of A and 5A becomes too high, the machining precision of these cylindrical rotary grinding bodies causes a center run-out phenomenon in which they swing while rotating, and as a result, the grinding marks on printed matter 1 remain uneven. As a countermeasure, the number of revolutions was gradually decreased in the direction of travel F.
It has been confirmed through experimental results that if the rotation speeds are different, each center runout is canceled out, and a finely ground finished surface can be obtained without causing unevenness on the printed surface of the printed matter 1. In particular, the rotational speed of the final rotary grinding body has a dominant influence on the grinding finish.

〔Effect of the invention〕

As explained above, by using the surface grinding machine of the present invention, it is possible to first roughly grind the printed surface of a telephone card, etc., and then grind it finely and uniformly. This has the effect that not only can a clean surface be obtained by completely removing the particles, but also that the grinding work can be carried out continuously, quickly and efficiently.

Additionally, the device of the invention can be made very compact;
It has the advantage of not taking up much setup space.

Note that the apparatus of the present invention can be effectively applied particularly when scraping off the printed surface of a printed telephone card and reusing it as a clean surface.

[Brief explanation of the drawing]

The drawing is a side view schematically showing the main parts of a printing surface grinding machine for printed matter according to an embodiment of the present invention. 1... Printed matter, 2.3B, 4B, 5B... Conveyance roller, 3A, 5A, 5A... Rotary grinding body, 6... Cooling water shower, 7... Doctor, F... direction of travel,
W...Cooling water. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] A plurality of sets of rotary grinding bodies having an abrasive material on the surface are arranged in the traveling direction of the printed matter, the rotation speed of at least one set of the rotary grinding bodies is rotated slower than the other sets, and cooling water is supplied to the rotary grinding bodies. , a surface grinder for printed matter designed to remove grinding slag.