JPS6164482A - Multicylinder mimeogtaphing copier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink roller for multi-cylinder copying machines, in which the ink coating is redistributed after inking in order to achieve proper uniformity of the ink layer, which is particularly important in the copying process. The present invention relates to a multi-cylinder mimeograph machine having an ink roller that applies a uniform layer of ink axially over the roller surface without the need for overflowing the roller surface.

Our C) B -A -2, [] 99. ．． 568 is an ink smear that applies a uniform layer of ink to the bottom cylinder of a multi-cylinder copier and also retains a bead of ink behind the top of the surface of that bottom cylinder that is not touched by the stencil. As a result of applying a uniform layer of ink by the inking member, this bead of ink is reshaped to pass through the fork between the inking member and the cylinder and emerge from the other side of the nip as an ink layer with the desired uniformity. -Includes rollers. Ink can be automatically delivered to the bead by an ink detection system published in our said GB-A-2,099,368.

The ink roller illustrated in our supra C) B-A-2,099,368 is capable of passing through relatively fine-grained stencils and is therefore expected to have a relatively low viscosity, making it difficult to use in conventional use. It not only has the properties of a mimeograph ink, but is also sufficiently hard to form a rolling bead that can be held back by the desired shape-shifting action of the inking member. Must require a carefully formulated ink.

The hardness of an ink that allows the ink to form a proper rolling beat can be called its internal cohesive force, which is described in the study of ink O rollers published in GB-A-2,099,38 (S. Inks with very high internal cohesion (which must be 6) for use in type tend to be too dark or too hard to pass through grid stencils.

In the past, more "high internal cohesive" inks were developed, in which the person operating the copier could "make the ink function properly" by adding various thickening or lightening additives. Although used in offset printing processes where possible, the use of such inks on mimeograph machines requires too much skill on the part of the operator to balance the inherent simplicity of the mimeograph process. Additionally, using such an ink would require much more frequent cleaning of the machine than would normally be expected for specially designed stencil inks having lower viscosities.

It is an object of the present invention that the competing requirements of the ability of the ink to form a rolling bead at the inking member and the ability of the ink to pass through a fine-grained stencil are combined with the incompatibility of thickening and lightening additives. It is an object of the present invention to provide a mimeograph machine that can be compromised without the need for stable mixing and without the need for an operator to maintain special control over the ink used.

We are aware in US-A-4,041,864 of using a rolling roller placed in the nip between the inking roller and the measuring roller, which, as explained above, It was conceived with an offset printing press in mind, where the rheology of the press is adjusted during use by a skilled operator.

In accordance with the present invention, a multi-cylinder mimeograph machine is provided.

This copier consists of a cylinder onto which a uniform layer of ink is applied and around which an ink-permeable stencil is wrapped during copying;
an inking member disposed alongside the cylinder and defining with the cylinder a nip through which ink can pass to form an even layer on the cylinder during rotation of the cylinder;
a device for applying ink to one side of said nip to form a wedge-shaped bead of ink extending into the nip; and a device positioned at said one side of the nip at the nip and within the bead of ink during use of the copier; including a roller arranged to be immersed in the water.

Preferably, the roller is driven to rotate in the same direction as the direction of the ink bead drawn in by the rotation of said cylinder.

In order that the invention may be more easily understood, the following description is given by way of example only, with reference to the accompanying drawings, in which: FIG. The only accompanying drawing is a side elevational view of the cylinder, the inking member and the roller immersed in a bead in the nip between the inking member and the cylinder.

Reference is also made to our description in GB-A-2,099,368.

As shown in the attached drawing, the geometric shape of the ink self-roller of the bottom cylinder 2 of the copier is ()B-A-2,099
, 368, but is immersed in a bead of ink 37 and rotates in the clockwise direction, i.e. in the direction of rotation of the bead of ink, if preferred. The difference is that there is another roller 51 that is moved.

In this case there is another row 251, which means that the copier is intended to have an integrated automatic ink supply.
Allows to be manipulated satisfactorily with increasingly greater latitude regarding the rheology of the ink.

The use of a rotating roller 51 on the inlet side of the nip where the bead of ink forms provides support for the bead and thus the ink itself has a high internal cohesive force that gives the ink the property of creating a rolling bead. Make the necessary rolling bead without giving the ammonia.What is surprising is that ()B -A -2,099+36
The ink roller announced in August 8 uses conventional mimeograph ink,
It has been found that it is specifically designed for use in multi-cylinder mimeograph machines and can therefore be used with inks that can be transferred through fine stencils and do not require high pressure differentials for this transfer. It was.

As mentioned above, row 251 is driven in a clockwise direction and best results are obtained if the rotational speed of roller 51 is the same as the rotational speed of the ink bead itself.

Furthermore, a bead 37 of ink is located symmetrically in the gap between the inking member 8 and the cylinder 2 and is thus held rearwardly by the inking member 8.
It is desirable to match the center of zero rotation.

As published in our supra 0B-A-2,099,368, the inking member 8 is capable of retaining a bead of ink 37 backwards and if this bead is uniformly distributed over the cylinder 2. It may be a fixed or self-driven cylindrical member as long as it is allowed to pass through the nip in a constrained manner to form a uniform layer 45.

The attached drawing shows an electrode plate 9 of a capacitive ink detector,
Other electrode plates could also be ink smear members or rows in the bead (51), but since capacitive sensing is not essential to this invention, some other form of ink detector system may be provided. Of course, it is also conceivable that this could happen.

The accompanying drawing also shows the ink distribution rod 38 and the ink film remaining on the surface of the cylinder after the cylinder and ink film are separated.

The remaining ink 39 is shown.

A mimeograph machine according to the invention can work satisfactorily with the coating member 8 and without the need for any separate ink distribution device downstream of the inking nip between the member 8 and the cylinder 2. To prove its ability to function, a series of tests have been carried out to ensure that the mimeograph machine is specially formulated to give optimal results. This was done using an ink that was expected to behave completely abnormally for a photocopy ink by settling into the bead. They are identified by trade name and by viscosity grade, and by the ability of their inks to be distributed smeared into the cylinder.

Example 1 The stencil with a 19cm wide image is our OB-A.
2,099,368, but using conventional inks intended for use in multi-cylinder mimeograph machines having axially reciprocating ink distribution rollers. .

The ink is a black Ke9 Stetona AMI ink with a viscosity of 2.5 voise and the ink is GB-A over the center of the bottom cylinder and over the rest of the cylinder.
-2, [199,368] with the intention of distributing the ink to the rest of the cylinder by the action of a rolling bead.

When the conditions are stable, the ink is evenly spread over the center 12cIrL of the image on the copy paper, but beyond that area the image is thinner in the lateral direction, and in some places the image is not filled with enough ink. It was missing.

With roller 51 in place and driven to rotate in the same direction as bead 37, the ink was uniform across the entire width of the print on the copy sheet.

Viscosity for Examples 1 and 2 (below) (j11 constants were carried out using a Fuerenci-Scharli cone and plate viscometer and the value was 2
Shear rates ranging from -200/sec to 1500/sec were measured at a temperature of 5°C.

Example 2 Using the same copier as in Example 1, a series of tests were carried out with inks from different manufacturers and with a specially formulated AMI ink, and the presence of roller 51 supporting ink bee 2 What is the effect, when the ink is dropped onto the bottom cylinder 2 at a position intermediate between its ends, when the ink is dropped onto the bottom cylinder 2, coach 1, ink row 28
and the effect on the ability to self-distribute along the groove formed by the bottom cylinder 2.

The results are given in Table 1. The vertical column on the left shows the name of the ink, and the second vertical column gives its viscosity in Boise,
The sixth vertical column shows the shear stress in dynes/glue 2 and the fourth vertical column shows the bead support roller 5 on which the ink in question is driven.
1 and the last vertical column shows the corresponding maximum speed when roller 51 is present.

The above destetoner AMI ink in Examples 1 and 2 is a fixed composition ink developed for use in mimeograph machines published in our supra C) B-A-2,099,368, and is very It is a special ink in that it has a low viscosity so that it can be applied and distributed without conventional axially reciprocating rollers and that the yield stress is not too high. Quite obviously, the presence of the ink bead support row 5I51 means that this ink can reside in the length of the bottom cylinder 2 without any additional device to form the required bead and move the bead along the cylinder. It has a dramatic effect on the ability to be distributed.

DeStetner A and rStetner B inks, as well as Roneo Alcatyl mimeograph ink and AB Dick 6400 ink, are all private company mimeograph inks, and in the case of Roneo and AB Dick inks, the presence of a roller means that the ink is at the bottom. It has been found that there is a slight improvement in the ability to distribute along the cylinder.

Letterpress ink is not intended for use in mimeograph machines, and as can be seen, it has a relatively low viscosity and very low yield stress, which is a dramatic improvement with the presence of roller 51. can be

The water-based ink is our GB-A-2,099,3
A specially formulated mimeograph ink of a non-emulsion variety specifically designed for use in 68 copiers. The presence of roller 51 dramatically improves the performance of this ink.

As a comparative example, further tests were conducted using two offset inks formulated for their rolling ability and the results are given in Table 2.

In Table 2, the viscosity values in the table were again measured using a Fuerenci-Scharley cone and plate viscometer, but the resulting viscosity values measured over a range of different shear rates were not directly related to the values given in Table 1. Can't compare. However, it is clear that the offset inks in row 2 of Table 2 have higher viscosities than those of Table 1.

Table 2 Offset printing ink 180 poise 6,000
80 80 Offset Ink is available under the Guest Chitner designation GO19T.

Aluminum soap-based inks are inks with a special formulation of mineral oil based on aluminum soap, which have a very sticky viscosity and, like offset inks, are very elastic. However, it has been found that when used with a mimeograph machine, the printout does not come out. It is listed in Table 2 to show that the very advantageous results obtained over mimeograph ink can be achieved in any case with offset ink without Row 2, but offset ink is It is too rigid to pass through a hole and cannot be printed on by some mimeograph machines.

[Brief explanation of the drawing]

The figure is a side elevational view showing the cylinder, the inking member, and the row 2 immersed between the beads at the nip between the inking member and the cylinder. In the figure: 2...Cylinder 8...Ink application member 37...Bead 51...Roller

Claims (8)

[Claims] (1) A cylinder to which a uniform layer of ink is applied during printing and around which an ink-permeable stencil is wrapped; a nip placed alongside said cylinder and through which ink can pass to form a uniform layer on this cylinder during rotation of the cylinder. an inking member forming with said cylinder (a V-shaped gap formed between two juxtaposed cylinders); In a multi-cylinder mimeograph machine including a side ink application device; on said one side of the nip, having a roller located at the nip and arranged to be immersed in a bead of ink during use of the copier; A multi-cylinder mimeograph machine featuring: (2) In the copying machine according to claim 1,
A multi-cylinder mimeograph machine, characterized in that said roller is driven to rotate. (3) In the copying machine according to claim 2,
A multi-cylinder mimeocopy machine characterized in that the direction of rotation of the ink bead caused by the rotation of the rollers and the rotation of the cylinder is the same. (4) In the copying machine according to claim 3,
A multi-cylinder mimeograph machine characterized in that the speed of rotation of the roller and the speed of rotation of the ink bead are equal. (5) A multi-cylinder copying machine according to any one of claims 2 to 4, wherein the roller is located at the center of rotation of the ink bead. Copy machine. (6) In the copying machine according to any one of claims 1 to 5, a device for applying ink to form a bead is provided on the surface of the cylinder upstream of the nip and the roller. A multi-cylinder mimeograph machine comprising a device for smearing. (7) A multi-cylinder copying machine according to any one of claims 1 to 6, further characterized by a device for detecting the volume of ink forming the bead. Copy machine. (8) In the copying machine according to claim 7,
A multi-cylinder mimeograph machine characterized in that said detector is a capacitive ink detector and said roller immersed within a bead constitutes one of the electrodes of said capacitive ink detector.