JPH0526376U - Ink continuous supply device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides an ink continuous supply device capable of transferring ink from an ink source roller to a delivery roller without impact. [Structure] One or more transfer rollers each having a peripheral speed varying means are provided between an ink source roller forming an ink key and an ink fountain and an ink reservoir, and an ink delivery roller for supplying ink to a downstream roller group. A continuous ink supply device with a minute gap in between.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention relates to a continuous feeding device for ink having a relatively high viscosity such as a commercial offset printing machine, and can be applied to an ink feeding device for sheet-fed printing machines.

[0002]

[Prior Art]

 A conventional ink supply device for a commercial offset printing machine will be described with reference to FIGS. 5 and 6. 1 is an ink fountain, 2 is an ink source roller that rotates at a low speed, and 4 is a delivery roller that rotates at a high speed. Here, the calling roller 3 periodically reciprocates between the ink source roller 2 and the delivery roller 4, and the ink in the ink fountain 1 rotates at a low speed, the calling roller 3 and the high speed rotation. Ink is supplied through the ink delivery roller 4 that is used.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional technique has the following problems. In the ink supply device of the commercial offset printing machine shown in FIG. 5, since the calling roller 3 reciprocates at a fixed cycle, an impact occurs when it comes into contact with the ink source roller 2 and the delivery roller 4. As the rotation speed of the plate 5 increases, the reciprocating cycle of the calling roller becomes shorter, and the mechanical impact force between the calling roller 3, the ink source roller 2 and the delivery roller 4, and the low speed ink source roller 2 and the high speed delivery Call to the roller 4 The impact force caused by the contact rotation of the roller 3 increases more than ever. At that time, the impact may cause a print failure on the paper surface 7 in contact with the blanket 6 in FIG.

An object of the present invention is to provide an ink continuous supply device capable of transferring ink from an ink source roller to a delivery roller without impact.

[0005]

[Means for Solving the Problems]

 As shown in FIG. 1, a new transfer roller 8 is installed between the conventional ink source roller 2 and the delivery roller 4, and the peripheral speed of the transfer roller 8 is made variable so that the ink source roller is continuously fed. 2 and the transfer roller 8 are rotated at different peripheral speeds, and the transfer roller 8 and the delivery roller 4 are also rotated at different peripheral speeds to be supplied with ink.

However, between the original roller 2 and the transfer roller 8 and between the transfer roller 8 and the delivery roller 4, gears of about 20 to 100 μm are provided.

[0007]

[Action]

 The ink on the slow-rotating ink source roller transfers to a transfer roller that rotates at a higher speed or at the same speed than the ink source roller with a minute gap, and the ink on the transfer roller leaves a minute gap and moves faster than the transfer roller. Transfers to the rotating ink delivery roller. Therefore, even if the rotation speed of the plate becomes high, ink can be supplied without causing any impact.

[0008]

【Example】

First Example A first example will be described with reference to FIG. Reference numeral 2 is an ink source roller having a diameter of 150 mm, 8 is a transfer roller having a diameter of 70 mm, and 4 is a delivery roller having a diameter of 84 mm. Now, when the peripheral speeds of the ink source roller 2, the transfer roller 8 and the delivery roller 4 are 0.2 m / s, 0.2 m / s and 15 m / s, respectively, the ink source roller 2 and the ink key 9 are FIG. 2 shows the relationship between the film thickness T ₁ on the ink source roller 2 defined by the gear tape and the true film thickness ΔT = (T ₅ −T ₆ ) of the ink supplied to the paper side. However, T ₆ = 10 μ.

In FIG. 2, the solid line is the first embodiment, and the broken line is the curve in the case of the conventional calling method described for comparison. At the same T ₁ (= 13 μ), the calling method of the comparative example lowers the value to 1 μ (point A), whereas in the present embodiment, it is possible to control to 0.5 μ (point B). In particular, when controlling the ink film thickness by squeezing the ink key, it is difficult to control T ₁ = 13 μ (point A) or less uniformly because of the problem of the key accuracy.

When T ₁ = 13 μ and V ₂ = V ₁ , the average gears h ₁ = 20 μ and h ₂ = 20 μ. Second Embodiment In the second embodiment, as shown in FIG. 3, transfer rollers are arranged in two stages. The roller diameter is the same as in the first embodiment, and there are two transfer rollers, 8, 10. The peripheral speeds of the ink source roller 2, the transfer rollers 8 and 10, and the delivery roller 4 are 0.2, 0.84, 3.56, and 15 m / s.

FIG. 4 shows the relationship between T ₁ and ΔT in this example and the comparative example (calling method). With the same gear of the ink source roller 2 and the ink key 9, a small amount of ink can be supplied in this embodiment. The average gears h ₁ , h ₂ , h ₃ are 20, 18 and 19μ, respectively. Next, the operation of the device according to the present invention will be described.

In FIG. 1, when the transfer roller 8 and the ink source roller 2 are operated in a nipped (contacting) state with a peripheral speed difference, non-uniformity of ink viscosity due to heat generation and roller surface are caused. It causes a rough surface on the top and causes printing problems. On the other hand, when the transfer roller 8 and the ink source roller 2 are rotated with a peripheral speed difference with a proper gear gap (gap of about 100 μ) set, there is no problem in heat generation, but on the transfer roller 4 When a small amount of ink is supplied to the ink, it is difficult to supply a small amount of ink even if the clearance between the ink key 9 and the ink source roller 2 is reduced. That is, in this case, it is difficult to control the clearance between the ink key 9 and the ink source roller 2 and supply the ink onto the paper surface with an accuracy of 0.1 μ or less.

However, if the transfer rollers 8 and 10 are arranged between the delivery roller 4 and the ink source roller 2 while maintaining a minute gear gap (20 μ to 100 μ or less) with respect to the rollers 2 and 4, problems such as heat generation will occur. It is possible to control the supply of a small amount of ink.

[0014]

[Effect of the device]

 In the continuous ink supply device according to the present invention, a peripheral speed varying means is provided between the ink source roller that forms the ink reservoir together with the ink and the ink fountain, and the ink delivery roller that supplies the ink to the downstream roller group. The following effects can be obtained by disposing one or more transfer rollers provided with a minute gap therebetween. (1) The ink can be continuously supplied without any printing trouble as the plate rotation speed increases. (2) A small amount of ink can be supplied.

[Brief description of drawings]

FIG. 1 is an arrangement view of rollers according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an effect of the first embodiment.

FIG. 3 is a layout view of rollers according to a second embodiment of the present invention.

FIG. 4 is a diagram showing an effect of the second embodiment.

FIG. 5 is an overall layout view of rollers in a conventional continuous ink supply device.

FIG. 6 is a diagram illustrating the operation of a conventional calling roller.

[Explanation of symbols]

1 Ink fountain 2 Ink source roller 4 Ink delivery roller 8 Transfer roller 9 Ink key h ₁ Minute gap h ₂ Minute gap

Claims (1)

[Scope of utility model registration request] 1. A transfer roller provided with a peripheral speed varying means, respectively, between an ink source roller that forms an ink reservoir with ink and an ink fountain, and an ink delivery roller that supplies ink to a downstream roller group. As described above, the continuous ink supply device is characterized in that they are arranged with a minute gap therebetween.