JPH0417153B2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to rotary mimeograph machines.

Prior Art Conventionally, as shown in Fig. 3, this type of rotary mimeograph machine includes a cylindrical plate cylinder 1 made of a mesh, a punching plate, etc., an ink roller 2 set inside the cylinder, and a plate cylinder. It is equipped with a press roller 3' which is provided so as to be able to come into contact with and separate from the outer peripheral surface, and a stripping claw 4 which is arranged behind the press roller 3' in the rotational direction of the plate cylinder 1, and the center A' of the press roller 3' is attached to the plate. A line X passing through the center B of the cylinder and the center C of the ink roller 2
It was located above.

When printing with such a printing press, the plate cylinder 1 rotates clockwise in response to a paper feed signal.
Paper 11 on a paper feed table (not shown) is fed one by one to the registration rollers 5, and the timing is adjusted.
It is conveyed between the plate cylinder 1 and the press roller 3'.
Then, the lock of the press roller 3' is released, and the press roller 3' moves the paper 11 along the line X to the plate cylinder 1.
Mimeograph printing is performed by pressing the base paper 10 wound around the plate cylinder 1 toward the center of the plate cylinder 1, and then a peeling claw 4 is inserted between the two papers 10 and 11 to peel the paper 11 from the base paper 10.

At this time, before the leading edge of the paper 11 touches the stripping claw 4, it needs to float above the surface of the base paper 10 using its waist, so the distance between the press roller 3' and the stripping claw 4 is increased to float it. I have a lot of time for this. However, since the press roller 3' is arranged at the position shown in the figure and performs a feeding action by pressing the paper 11 against the plate cylinder 1 in the above-mentioned direction, it hardly has the effect of floating the paper 11 after printing. do not.

On the other hand, between the stripping claw 4 and the base paper 10, there is a base paper 10
A gap is provided to protect the For this reason, if there is an ink image on the leading edge of the paper 11, the paper 11 will be difficult to peel off due to the viscosity of the ink, and if the paper 11 is curled upward, the plate cylinder
It had the disadvantage that it was stuck in a sticky state and ended up winding up for any purpose.

Purpose This invention eliminates the drawbacks of conventional mimeographing machines as described above, and provides a mimeographing machine that can reliably prevent paper curling, has good paper ejection performance, and is simple in structure and inexpensive. The purpose is to

Configuration In order to achieve the above-mentioned object, this invention has the following features:
The press roller is characterized in that the center of the press roller is disposed in front of a line passing through the centers of the plate cylinder and the ink roller in the direction of rotation of the plate cylinder, and the following are as follows:
A detailed explanation will be given based on an embodiment of the present invention shown in FIG.

Since most of this embodiment is exactly the same as the conventional one, the same reference numerals will be used for such parts and the explanation will be omitted.
The main differences will be explained.

In this printing press, the center A of the press roller 3 is on a parallel line Y that is a distance l apart from the line X between the center B of the plate cylinder 1 and the center C of the ink roller 2; It is offset toward the front in the rotational direction of the barrel 1, that is, to the right in the drawing.

Figure 2 shows the situation in which printing is performed using this device, and the point at which the plate cylinder 1 and press roller 3 press the paper 11 is deviated from the line X, and as a result, The paper 11 is given a downward curl corresponding to the diameter of the press roller 3. Furthermore, since an ejection angle θ is formed that is not seen in conventional products, the paper 11 is more likely to peel off from the base paper 10, and even if there is an image on the leading edge or if the paper tends to curl upward, floats up from the base paper 10 and is easily peeled off by the peeling claw 4.

Effects This invention is as described above, and since the center of the press roller is located in front of the line passing through the center of the plate cylinder and the ink roller in the direction of rotation of the plate cylinder, an ink image is formed on the leading edge of the paper. In addition, due to the viscosity of the ink, the paper is less likely to peel off than the base paper, and even if the paper curls upward, the leading edge of the paper is reliably lifted above the base paper, and as a result, there is no possibility of paper ejection failure. Moreover, since it does not require a particularly complicated mechanism, it has the advantage that it can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal front view of an embodiment of the invention;
FIG. 2 is a partial front view showing the same as the above during printing, and FIG. 3 is a drawing similar to FIG. 1 of a conventional rotary copying machine. 1... Plate cylinder, 2... Ink roller, 3... Press roller, 4... Stripping nail, 10... Base paper, 11...
...Paper.

Claims (1)

[Claims] 1. A cylindrical plate cylinder, an ink roller installed in the plate cylinder that applies ink to the inner circumferential surface of the plate cylinder, a press roller arranged so as to be able to approach and separate from the outer circumferential surface of the plate cylinder, and In a rotary mimeograph machine equipped with a stripping claw located behind the press roller in the direction of rotation, the center of the press roller is pressed before a line passing through the center of the plate cylinder and the ink roller in the direction of rotation of the plate cylinder. A rotary mimeograph printing machine characterized by being arranged as follows.