JPS584672Y2 - Ink supply device for metal printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink supply device for a metal printer.

When printing a sheet mark or the like on a metal surface such as a steel plate, it is necessary to uniformly supply an appropriate amount of ink with an appropriate concentration to the type in order to obtain a clear mark.

Conventionally, for this purpose, ink of an appropriate concentration is jetted or applied onto the surface of an ink supply roll made of a liquid-permeable material.
Ink was supplied by bringing this roll into direct pressure contact with a rotatably driven printing drum or by bringing it into pressure contact via an ink transfer roll.

However, it is difficult to maintain the concentration of ink supplied to the printing surface within an appropriate range for a long period of time, and there are also problems such as the lower part of the ink supply roll being stained with ink.

Ordinary pudding! - A hollow part is provided along the axis of the ink supply roll as a supply device, liquid ink flows into the hollow part, and this ink is transferred from the ink supply roll to the type on the printing drum. There is a device designed to do this.

However, when using such an ink supply roll that allows ink to flow in, the ink remains in the ink supply roll, so a large amount of ink permeates into the ink supply roll when printing is stopped, and when printing resumes, the type is not printed. The amount of ink supplied to the printer becomes excessive.

For this reason, if the material to be printed is a metal material that does not absorb ink, the printed mark will be too dark and unclear, and it will take time to dry, making it impossible to pack the product immediately.

On the other hand, if the flow of ink is stopped in order to avoid this force, there is a problem in that too little ink is supplied to the type, resulting in the marks becoming extremely pale.

That is, when a mark is printed on a material, such as a metal, into which ink does not permeate, there is a problem that fluctuations in the amount of ink supplied to the ink supply roll have a sensitive effect on the shading of the mark.

For this reason, in metal printers, it is necessary to appropriately control the amount of ink supplied.

The present invention was developed for the purpose of supplying an appropriate amount of ink of an appropriate concentration to the type on the printing drum of a metal printer only during printing, and printing can be performed directly from the ink supply roll or via an ink transfer roll. In an ink supply device configured to transfer ink to a drum, the ink supply roll is made of a liquid-permeable material having a hollow part inside, and a conduit for supplying atomized ink into the hollow part. This is an ink supply device for a metal printer, characterized in that the ink supply device for a metal printer is connected to the hollow portion, and is capable of ejecting atomized ink into the hollow portion.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described below with reference to the drawings, taking a sheet mark printer for steel plates as an example.

In Fig. 1, 1 is a printing drum, on the outer periphery of which four types of sheet mark letters 2 are fixed, and by eccentric rotation in the direction of the arrow, sheet marks are printed on the lower surface of the steel plate 3. .

Reference numeral 4 denotes an ink supply roll, and an artificial leather 6 is attached to the outer periphery of a cylindrical body 5 made of a liquid-permeable material such as Scotch prite shown in FIG. 2, and the artificial leather 6 alleviates fluctuations in the amount of ink supply. It also has the effect of uniformly dispersing the ink over the entire surface of the ink supply roll 4.

Further, a core tube 8 having a large number of through holes 7 is inserted into the inner surface of the cylindrical body 5, thereby reinforcing the cylindrical body 5.

Reference numeral 9 denotes an atomized ink supply tube for supplying atomized ink into the hollow portion formed by the core tube 8, and one end passes through the inside of the tubular support 10 and is connected to the ink jet port 1 within the core tube 8.
1 is open, and the other end is connected to a siphon-type ink atomization generator 14 shown in FIG.

15 is an ink stirring tank of the atomized ink generating device 14; 16 is a compressed air conduit; 17 is a solenoid valve for controlling the ink supply amount according to the print speed, that is, ink consumption; 18 is a valve; 19 is a branch pipe; 20 is i/ri suction pipe,
Reference numeral 12 in FIG. 2 is a bearing for the shaft 10.

The atomized ink sent from the atomized ink generator 14 passes through the atomized ink supply pipe 9 and is ejected from the ejection port 11 into the core tube 8.

At this time, since the ink supply roll 4 is being rotated by the transmission of the rotationally driven printing drum 1, the core tube 8
The ink ejected into the core tube 8 is evenly supplied to the entire circumference of the inner surface of the core tube 8, and is sent to the cylindrical body 5 and further to the artificial leather 6 by centrifugal force from the through hole 7, and is evenly distributed around the entire circumference of the artificial leather 6. Supplied.

The ink sent to the artificial leather 6 is transferred to the sheet mark letters 2 of the printing drum 1 which is rotating in contact with the artificial leather 6, and a sheet mark is printed on the steel plate 3.

If liquid ink is allowed to flow into the core tube 8 instead of the atomized ink, it becomes difficult to adjust the ink seeping onto the surface of the artificial leather 6 to an appropriate concentration and amount, and the printed sheet mark becomes unclear. Become.

In other words, when the ink concentration is low, the amount of ink leached is too large, causing a "bleed" on the printed sheet mark and takes time to dry.On the other hand, when the ink concentration is low, the amount of leaching is insufficient, causing a "smear" on the printed sheet mark. .

Incidentally, when printing is not performed, the supply of the atomized liquid into the core tube 8 is stopped.

FIG. 3 shows another embodiment of the device of the present invention, in which an ink transfer roll 13 made of a porous material such as foamed urethane or porous rubber is inserted between the ink supply roll 4 and the printing drum 1. and the ink transfer roll 13
This further improves the effect of eliminating fluctuations in the amount of ink supplied.

In addition, in the device of the present invention, if the liquid-permeable material used for the cylindrical body 5 has high strength, the core tube 8 is not necessarily required.

As described above, the device of the present invention can supply ink only when printing sheet marks, so it can supply an appropriate amount of ink, and there is no oversupply.

For this reason, it is particularly suitable for printers made of materials that cannot be penetrated by ink, such as plastic and glass.

[Brief explanation of drawings]

Figures 1 and 3 are schematic explanatory side views of the device of the present invention;
The figure is an enlarged cross-sectional perspective view showing the inside of the ink supply roll of the apparatus of the present invention. 1 is a printing drum, 4 is an ink supply roll, 5 is a cylindrical body made of a liquid-permeable substance, 9 is an atomized ink supply pipe,
13 is a roll for ink transfer.

Claims (1)

[Scope of utility model registration request] An ink supply device configured to transfer ink to a printing drum directly from an ink supply roll or from the ink supply roll via an ink transfer roll, the ink supply roll having a hollow portion inside. It is made of a material that is permeable to liquid, and the compressed air conduit is branched into two halves, and the end of one branch pipe is immersed in the ink in the agitation tank, and the other branch pipe generates atomized ink. A device is connected to the device, and an atomized ink supply tube and an inlet suction tube whose one end is immersed in the ink in the ink stirring tank are connected to the device. An ink supply device for metal fillers that looks into the hollow part.