JPH0525896Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Technical field of invention] The present invention relates to a transfer device.

[Technical background of the invention and its problems]

Traditionally, printers that print type on tickets, etc.
A transfer device that transfers the ink by pressing an ink roll impregnated with a predetermined ink against a printing drum, and performs desired printing on a printing medium such as paper that is pressed against the circumferential surface of the printing drum by a presser roll or the like. Built-in. The quality of printing is largely influenced by the amount of ink impregnated in the ink roll and the pressure of the printing drum. That is, if the pressing force of the print drum that presses down the ink roll is large, a large amount of ink comes out and the quality of printing deteriorates. On the other hand, if the pressure applied to the ink roll is small, the ink inside the ink roll will not come out to the surface, and the amount of ink used will be small, making it impossible to print clearly.

Further, a transfer device is used in which a transfer roll is interposed between the ink roll and the print drum, and the ink is transferred to the transfer roll once and then transferred to the print drum. In this case as well, the ink is transferred by the pressing force of the ink roll by the transfer roll, and there is a problem in that the quality of printing is greatly influenced by the magnitude of the pressing force applied to the ink roll, as described above.

[Purpose of invention]

An object of the present invention is to provide a transfer device that can always transfer an appropriate amount of ink to an ink supply means and easily perform high-quality printing.

[Summary of the idea]

The present invention is equipped with a transfer roll in which a large number of open cells with a cell diameter smaller than that of the ink roll are formed on the surface layer, so that the appropriate amount of ink can always be transferred to the ink supply means to achieve high quality. This is a transfer device that can easily perform printing.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an embodiment of the present invention. Reference numeral 1 in the figure denotes a printing section ink supply means consisting of a printing drum 2 and a predetermined printing mark (printing section) 3 built into the circumferential surface of the printing drum 2. A printing medium 4 such as paper is continuously supplied to the circumferential surface of the printing drum 2 while being pressed against it by a presser roll 5 . Also,
An ink roll 7 is pressed against the circumferential surface of the printing drum 2 via a transfer roll 6. The printing drum 2, presser roll 5, transfer roll 6, and ink roll 7 are continuously rotated by a drive mechanism (not shown) in synchronization with the feeding of the printing medium 4.

Here, as shown in FIG. 2, in addition to members consisting of a printing drum 2 and a printing mark 3, the printing part ink supplying means 1 is supplied to the printing part 8 while being in contact with the circumferential surface of a transfer roll 6. The ink ribbon 9 may also be used. Alternatively, as shown in FIG.
It may be a planographic plate 10 that reciprocates between the printing unit 8 and the transfer roll 6 while intermittently contacting the peripheral surface of the printing plate 10 .
In short, any device may be used as long as it transfers ink between the transfer roll 6 and the printing material 4.

The ink roll 7 has open-cell cells 7 for accommodating ink so that it can be impregnated with a predetermined amount of ink.
It has a surface layer 7b in which a large number of a are formed. The ink roll 7 can be easily manufactured by, for example, using a sintering method to create a sponge body with a network structure having portions that serve as cells 7a that exhibit capillary action, and forming the surface layer 7b with this sponge body. The opening diameter of the cell 7a is desirably set in the range of 40 to 50 μm.

The surface layer 6a of the transfer roll 6 is the ink roll 7
It has a large number of cells 6b having a diameter smaller than that of the cell diameter. The opening diameter of the cells 6b of the transfer roll 6 is 5.
It is desirable to set it in the range of ~10 μm. The reason why the cell diameter of the transfer roll 6 is made smaller than that of the ink roll 7 is to quickly supply ink from the ink roll 7 to the transfer roll 6 by capillary action. If the cell diameter is less than 5 μm, the ink capacity per unit cell 6b will be small and the efficiency will be poor, and if it exceeds 10 μm, sufficient capillary action will not be obtained. The surface layer 6a of the transfer roll 6 can also be easily made by a sintering method.

According to the transfer device 20 configured in this way,
Since a large number of cells 6b having a cell diameter smaller than that of the ink roll 7 are formed on the transfer roll 6, the ink from the ink roll 7 is quickly transferred by capillary action without being greatly affected by the pressing force between the two. can be accepted. Therefore, it is possible to always transfer an appropriate amount of ink to the ink supply means 1 and easily perform high-quality printing. Incidentally, in the transfer device 20 of the example, 70 to 80% of the ink impregnated in the ink roll 7 could be received on the transfer roll 6, but in the conventional device, the ink acceptance rate was about 40 to 50%, and the ink It has been experimentally confirmed that the life of the roll 7 is also much longer than that of conventional rolls.

Note that by using the transfer roll 6 of the embodiment, a hard ink roll 7 can be used.

[Effect of idea]

As explained above, according to the transfer device according to the present invention, high quality printing can be easily performed by always transferring an appropriate amount of ink from the ink roll to the ink supply means.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing other examples of the printing section ink supply means. DESCRIPTION OF SYMBOLS 1...Printing part ink supply means, 2...Printing drum, 3...Printing mark, 4...Printing object, 5...Press roll, 6...Transfer roll, 7...Ink roll, 8...Printing Part, 9... Ink ribbon, 10...
...Lithograph, 20 ...Transfer device.

Claims (1)

[Scope of utility model registration request] An ink roll having an ink-impregnated layer on its peripheral surface and rotating continuously, and a surface layer having a surface layer formed with a large number of open cells having a diameter smaller than that of the ink-impregnated layer and in pressure contact with the ink-impregnated layer, and continuously rotating. A transfer device comprising: a transfer roll; and a printing section ink supply means for supplying ink to a printing section while contacting the surface layer of the transfer roll.