JPH0439007Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a finisher roll positioning device that is housed in an ink tray of a printing machine and rotates with the printing roll to deposit ink on the printing roll.

<Prior Art> In a printing press, a finisher roll is housed in an ink tray and rotates together with the printing roll to deposit ink on the printing roll.

Conventional finisher rolls have cylindrical magnets fitted at both ends, which magnetically attract the printing roll. However, when setting an aluminum printing roll in a printing machine, the finisher roll no longer attracts the printing roll with magnetic force, and therefore does not work with the printing roll to attach ink to the printing roll. occured.

<Purpose of the invention> This invention was devised in view of the points mentioned above.
Regardless of whether the printing roll is made of iron or aluminum, a finisher roll positioning device for a printing press is used in which the finisher roll rotates in close contact with the printing roll and works to adhere ink to the printing roll. It is about providing.

<Means for achieving the objective> The finisher roll positioning device of the printing press of the present invention includes a pair of left and right first permanent magnets which are formed in an appropriate shape and are provided at both ends of the finisher roll, and whose magnetic force is in the roll axis direction. The first permanent magnet is opposed to the first permanent magnet at a diagonal distance from both end faces of the finisher roll, and is repelled by the first permanent magnet to suppress the shift of the finisher roll in the axial direction. It is characterized by having second permanent magnets or electromagnets arranged on both sides of the finisher roll that is pressed against the printing roll.

<First Example> In FIGS. 1 to 3, 1 is a printing roll, 2 is a compaction roll, 3 is a finisher roll,
4 is a doctor, 5 is an ink tray, and 6 is a base paper.
The finisher roll 3 is made of plastic and has a cylindrical tube 31 sealed with lids 32, 32.
A first permanent magnet 7 is adhered to the inner surface of each lid 32. The first permanent magnet 7 is formed into a cylindrical body,
It is magnetized so that the end on the lid side becomes the south pole. With the finisher roll 3 in close contact with the printing roll 1, a plurality of second permanent magnets arranged in an arcuate manner are spaced diagonally from both end faces of the finisher roll 3 and face and repel the first permanent magnet 7. There is a permanent magnet 8.

Therefore, since the first permanent magnet 7 repels the second permanent magnet 8, the finisher roll 3 comes into close contact with the printing roll 1 and is restrained from shifting from the printing roll 1 in the axial direction. be done.
Therefore, regardless of whether the printing roll 1 is made of iron or aluminum, the finisher roll 3 rotates in close contact with the printing roll 1 and functions to adhere ink to the printing roll 1.

Note that the second magnet 8 may be an electromagnet.
Further, the second magnet 8 may be an arcuate permanent magnet.

<Effects of the invention> As described above, the finisher roll positioning device of the printing press of the present invention makes use of the repulsion of the magnet to bring the finisher roll into close contact with the printing roll, and prevents it from shifting from the printing roll in the axial direction. Because of this structure, the finisher roll can be rotated in close contact with the printing roll, regardless of whether the printing roll is made of iron or aluminum, and can work to adhere ink to the printing roll.

[Brief explanation of the drawing]

1 to 3 relate to a first embodiment of a positioning device for a finisher roll of a printing press according to the present invention, and FIG. Figure 1 is - in Figure 3.
A sectional view taken in the direction of arrows, and FIG. 2 is a - sectional view taken in FIG. 1. 1... Printing roll, 2... Compacting roll, 3...
Finisher roll, 4...Doctor, 5...Ink tray, 6...Base paper, 7...First permanent magnet, 8
...Second permanent magnet.

Claims (1)

[Scope of utility model registration request] A pair of left and right first permanent magnets formed in an appropriate shape and provided at both ends of the finisher roll, the magnetic force of which is directed in the roll axis direction, and a first permanent magnet located diagonally apart from both end faces of the finisher roll. A second permanent magnet or A finisher roll positioning device for a printing press characterized by being equipped with an electromagnet.