JPH0780287B2 - Letterpress printing equipment - Google Patents

Description

The present invention relates to a letterpress printing apparatus.

[Prior Art] A conventional letterpress printing apparatus has a structure as shown in FIG. That is, the ink 20 is held between the ink tank roller 21 and the doctor blade 22, and is spread on the surface of the ink tank roller 21 by the rotation of the ink tank roller 21 through the gap between the ink tank roller 21 and the doctor blade 22. The ink attached to the surface of the ink tank roller 21 is transmitted from the ink transfer roller 23 to the ink kneading roller 24. The ink kneaded by the ink kneading roller 24 is transmitted to the first and second ink thickening rubber rollers 25 and 26, and one of the ink thickening rubber rollers 25 and 26, the second ink in the illustrated case, is used. The inked rubber roller 26 reciprocates in the horizontal direction, and the ink is transferred to the rubber relief plate 28 provided on the lower surface of the plate table 27. Thereafter, the plate table 27 descends and rises to bring the rubber relief plate 28 into contact with and pressurize the printed matter 29 to transfer the ink.

[Problems to be Solved by the Invention] The above conventional technique has the following problems.

First, it is difficult to adjust the gap between the ink tank roller 21 and the doctor blade 22 in parallel to several μm, and it is difficult to adjust the ink film thickness. In this case, there is a high degree of dependence on the intuition and experience of the operator.

Secondly, since it is transferred to the rubber relief plate 28 through the plurality of rollers 21 to 26, it takes time until the result is displayed even if the ink film thickness is adjusted.

Third, the number of components is very large, and more than one roller 21
~ 26 rotation speed control, horizontal movement control of ink inking rubber roller 26, ink tank roller 21 and doctor blade 22
This requires a gap adjusting mechanism, etc., which makes the mechanism complicated and expensive.

It is an object of the present invention to provide a letterpress printing apparatus that does not require adjustment of the ink film thickness, has a simple structure, and is inexpensive.

[Means for Solving the Problems] An ink pot including a blade having an ink reservoir portion formed at a lower end thereof, and an ink tank which is detachably attached to the blade and communicates with the ink reservoir portion to store ink upward,
An ink replenishing member in which a concave portion having a uniform depth is formed on a smooth upper surface, and the ink replenishing member and the ink pot are relatively arranged with the lower end of the ink pot pressed against the upper surface of the ink replenishing member. Horizontal driving means for moving horizontally, and a letterpress at the lower end, and the ink filled in the recess of the ink inking member is contacted with the letterpress to apply the ink, and the ink attached to the letterpress on the printed matter. This is solved by adopting a configuration including a plate table for transferring.

[Operation] When the ink pot and the ink replenishing member are horizontally moved relative to each other while the lower end of the ink pot is pressed against the ink replenishing member, the ink in the ink reservoir of the ink pot is recessed in the ink replenishing member. Is filled. Next, when the letterpress is brought into contact with the ink filled in the depressions, the ink in the depressions adheres to the letterpress. Therefore, when the letterpress is pressed against the printed matter, the ink attached to the letterpress is transferred to the printed matter.

In this case, since the ink film thickness transferred to the printed matter is physically determined by the depth of the recess of the ink inking member, a stable ink film thickness with little variation can be obtained. Further, the number of constituent parts is small and the control mechanism is also small, so that the apparatus is inexpensive.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. As shown in FIG. 1, the ink inking member 1 is composed of a substrate 2 and a recess plate 4 fixed to the substrate 2 with screws 3. The upper surfaces of the substrate 2 and the recess plate 4 are smooth surfaces. Has become. On the upper surface of the recess plate 4, a recess 4a having a depth corresponding to the film thickness of the ink applied to the printed material 5 is formed. The ink inking member 1 is positioned and fixed on a table 6 which is horizontally moved by a driving means (not shown).

An ink pot 10 is arranged above the ink inking member 1 so as to be vertically movable. Ink pot 10 is a blade
11, an ink tank 12 detachably screwed to the blade 11, and a lid 13 that covers the ink tank 12 from above. An ink reservoir 11a is formed at the lower end of the blade 11, and the ink tank 12 is formed. An ink storage portion 12a that stores the ink tank 14 and a slit portion 12b that communicates with the ink storage portion 11a from the ink storage portion 12a are formed on the upper side.
Further, the ink reservoir 11a is formed in a semicircular shape as shown in FIG.

On the upper right side of the ink inking member 1, a rubber relief plate is formed on the lower surface.
A plate stand 16 having 15 is provided so as to be vertically movable.
The above-mentioned printed matter 5 is arranged below.

Next, the operation will be described. As shown in FIG. 1A, when the ink pot 10 is lowered and the lower end of the ink pot 10 is brought into contact with and pressed by the ink inking member 1, the table 6 is set as shown in FIG. When you move horizontally to the right,
The ink 14 in the ink reservoir 11a is filled in the recess 4a of the recess plate 4. Next, when the plate stand 16 descends as shown by the chain double-dashed line, the rubber relief plate 15 comes into contact with the ink 14a in the recess 4a, and the rubber protrusion 1
Add ink 14a to 5. Next, as shown in FIG. 7C, the platen 16 is raised and the table 6 is horizontally moved leftward. After that, the platen base 16 descends again as shown by the chain double-dashed line, and the rubber relief plate 15 is pressed against the printed matter 5 to apply pressure to it.
The ink 14b attached to the lower surface of 15 is transferred to the printed matter 5.
Then, the platen 16 is raised to the original position.

As described above, the ink film thickness transferred to the printed matter 5 is physically determined by the depth of the concave portion 4a of the ink inking member 1, so that a stable ink film thickness with little variation can be obtained. Further, the number of constituent parts is small and the control mechanism is also small, so that the apparatus is inexpensive. Further, the ink pot 10 is composed of a blade 11 having an ink reservoir 11a, and an ink tank 12 which is detachably attached to the blade 11 and which communicates with the ink reservoir 11a and accommodates the ink 14 above. Ink
When the remainder of 14 is low or gone,
It is only necessary to replace it with a new ink tank 12 containing the ink 14, and the work can be done quickly and easily.

Further, as shown in FIG. 2, when the ink reservoir 11a is formed in a semicircular shape and the ink scraping portion 11b is formed in a straight line, the upper surface of the ink 14a filled in the recess 4a is easily flattened. A uniform ink film thickness can be obtained.

Although the ink inking member 1 is composed of the substrate 2 and the recess plate 4, the recess 4a may be formed in the substrate 2. However, when the recess plate 4 having the recess 4a is detachably provided on the substrate 2 as in this embodiment, when the ink film pressure changes,
It can be easily replaced with a recess plate 4 having a recess 4a having a corresponding depth. The relief plate 15 is not limited to rubber, and may be plastic or metal, for example.

EFFECTS OF THE INVENTION According to the configuration of claim 1, since the ink film thickness transferred to the printed matter is physically determined by the depth of the concave portion of the ink inking member, it is not necessary to adjust the ink film thickness, and variations occur. A small and stable ink film thickness can be obtained. In addition, an inexpensive device having a simple structure can be obtained. Furthermore, since the ink pot is composed of a blade having an ink reservoir and an ink tank that is detachably attached to the blade and communicates with the ink reservoir to store ink in the upper portion, the ink remaining in the ink tank is reduced. In the case of disappearance or loss, it is only necessary to replace with a new ink tank containing ink, and the work can be done quickly and easily.

According to the structure of the second aspect, since the upper surface of the ink filled in the concave portion of the ink inking member is easily flattened, a more uniform ink film thickness can be obtained.

According to the configuration of claim 3, when the ink film thickness changes, it can be easily replaced with a recess plate having a recess having a depth corresponding thereto.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention,
(A) is an operation state diagram in which an ink pot is brought into contact with and pressed by an ink inking member, (b) is an operation state diagram in which ink is applied to a rubber relief plate on a platen plate, and (c) is a rubber letterpress ink transferred to a printed matter. Fig. 2 is a bottom view of the ink pot,
FIG. 3 is an explanatory diagram of a conventional example. 1: ink inking member, 2: substrate, 4: concave plate, 4a: concave part, 5: printed matter, 6: table, 10: ink pot, 11: blade, 11a: ink reservoir, 12: ink tank, 14: Ink, 15: rubber letterpress, 16: plate stand.

Claims (3)

[Claims] 1. An ink pot comprising a blade having an ink reservoir formed at its lower end and an ink tank which is detachable from the blade and communicates with the ink reservoir to store ink in an upper portion, and a uniform upper surface. An ink replenishing member having a depth recess, and a horizontal drive means for relatively horizontally moving the ink replenishing member and the ink pot with the lower end of the ink pot pressed against the upper surface of the ink replenishing member. And a platen having a letterpress at the lower end, and contacting and pressurizing the letterpress to the ink filled in the recesses of the ink inking member to transfer the ink attached to the letterpress to the printed matter. A letterpress printing device characterized by being provided. 2. The ink reservoir of the blade is formed in a substantially semicircular shape.
The letterpress printing apparatus described in the item. 3. The letterpress printing apparatus according to claim 1, wherein the ink inking member comprises a substrate and a recess plate detachably fixed to the substrate and having a recess on the upper surface.