JPS60283Y2 - Printing machine print stain prevention device - Google Patents

Description

[Detailed description of the invention] This invention relates to a printing smear prevention device for a printing machine having an ink roller, and is particularly concerned with a string of uppercase letters facing a printing hammer with a large printing pressure and a string of lowercase letters facing a printing hammer with a small printing pressure. This invention relates to a printing smudge prevention device for a printing machine equipped with type drums arranged on the entire outer peripheral surface of a row.

In printing machines with ink rollers, ink adheres to the entire outer circumferential surface of the type drum, and when the paper is pressed with a hammer to print certain type, the paper comes into contact with the type surfaces on both sides of that type, causing the paper to become dirty. Furthermore, when printing type letters with a deep recess in the center, such as the number 10, the force of the hammer press may cause the paper to bend, and this flexure may come into contact with the recess of the type, causing the printed characters to become distorted. The center of the screen may get dirty.

Conventionally, as shown in FIG. 1, a type drum t is placed between the outer circumferential surface of a type drum 2, on which a string of uppercase letters 3a and a string of lowercase letters 3b are arranged, and the moving path of the paper 6.
, 2, an elastic thin plate 5 having a gap 5a facing each type character and a guard part 5b facing between each character row.
When printing is performed, the guard parts 5b on both sides of the type to be printed are pressed by the hammer 4 through the paper 6 and come into contact with the outer peripheral surface of the type drum 2, as shown in FIG. The thin plate 5 is brought into contact with the portion of the type drum 2 where there are no typed characters to prevent the paper 6 from coming into contact with the typed characters on both sides.

However, since the thin plate 5 of uniform thickness was arranged for both the uppercase character type string 3a with a high printing pressure and the lowercase character type string 3b with a small printing pressure, the thickness of the thin plate 5 was adjusted to match the printing pressure. When adapting the machine to the uppercase type, so that the uppercase letters could be printed clearly, the elastic force of the thin elastic plate was too large for the lowercase type, which requires less printing pressure, and the lowercase type was printed as shown in Figure 2. When the elastic repulsive force of the thin plate 5 is large and the stamping force of the hammer 4 is reduced, causing the thin plate 5 to come into contact with the part of the type drum 2 where there is no type, the printing may become unclear; If the thickness is adjusted to suit lowercase type with a lower printing pressure, then in the case of uppercase type with a higher printing pressure, the elastic repulsion force of the thin plate 5 is small, so when printing uppercase letters, the deflection of the paper 6 will affect the type. There was a drawback that it could not prevent contact with the recessed portions, and in any case, clear printing could not be performed.

In addition, due to pressure technology, the width of the guard portion 5b of the thin plate 5 is
[It is difficult to make the thickness smaller than the thickness of the thin plate 5] If the spacing between the character rows is smaller than the thickness of the thin plate 5, the guard portion 5b of the thin plate 5 is processed to match the spacing between the character rows. There were times when things became difficult.

This invention aims to eliminate the above-mentioned conventional drawbacks.

Hereinafter, this invention will be explained with reference to an example. FIG.
The roller 1 is supported on the machine frame so as to be rotatable about the 1'531 axis, and the printing presses 1 and 2 are rotated about a fixed axis parallel to the co-moving axis of the ink roller 1. The ink roller 1 is supported on the frame so that its outer circumferential surface is in contact with the outer circumferential surface of the ink roller 1.

Also, the typeface of the drums l and 2 is a capital letter 3a against the tram surface.
, 3a are high and the lowercase letters 3b, 3b are low.

A hammer 4 that faces a plurality of uppercase letters that corresponds to each letter in the letter row of the letter tram 2 and is capable of coming into contact with and separating from the letters.
The hammer is smaller than the hammer 4 and is placed opposite the lowercase type, between the type tram 2 and the movement path of the paper 6, and between the type tram 2 and the movement path of the paper 6. , a gap 7a for each of the printed characters l to ul, 2,
Thin plates 7 and 8 having corresponding guard portions 7b and 8b are arranged between the rows of type letters 8a, 1 and 2.

FIG. 4 is an exploded oblique view of the printing smear prevention device of this invention, and the thin plates 7 and 8 are made of a rust-proof and highly elastic material such as stainless steel.

The portions of the thin plate 7 between a plurality of gaps facing the typefaces 3a and 3b serve as guard portions 7b.

A plurality of gap portions 8a are formed in the thin plate 8, each facing the type row 3a, and the portion between the gap portions is a guard portion 8.
h.

Then, the combined thickness of the thin plates 7 and 8 is slightly thicker than the height of the uppercase letter 3a, and the thin plate 7 is
The thickness of the lowercase letters 3b should be slightly higher than the thickness from the drum surface to the typeface of the lowercase letters 3b.

The frame body 9 is provided with a window 10 having a width wider than the width of the type drum 2 in the rotational axis direction, and a pair of mounting arms 11 for fixing the frame body 9 to the machine frame. It is formed along the outer circumferential surface of the type drum 2 into a substantially circular arc having a radius of curvature larger than the outer circumferential surface of the type drum 2.

After that, the thin plate 7 is attached to the frame 9 using adhesive, for example, so as to cover the window 1o, and the thin plate 7 is attached so that the gap 8a corresponds to only the part of the gap 7a that faces the type row 3a. 8 to the thin plate 7, for example with adhesive.

As shown in FIG. 5, the frame 9 in which the thin plates 7 and 8 are fixedly arranged is arranged so that the voids 7a are opposite to the lowercase character rows 3b, and the voids 8a are opposite to the uppercase character rows 3a. Fixedly place it on the machine frame so that

With the above configuration, when the type drum 2 is connected to the drive tanabata (not shown) and rotated, it comes into contact with the outer peripheral surface of the type drum 1.2, and the ink roller 1 is rotated. Type] - Supply ink to the outer peripheral surface of the ram 2.

Then, hammer the paper 6 with the hammer 494' to thin i7. Printing is performed between 8 and 8.

When printing lowercase letters, the hammer 4' presses the paper 6 into the corresponding gap 7a through the paper 6.
Push the gar I/sections 7b on both sides of a to bring the lower surface of the card section 7b into contact with the outer peripheral surface of the type drum 2, and press the paper 6.
Touch the printing surface of the printing type 3b 1, and perform a ta J-ji.

When printing capital letters, the hammer 4 presses the paper 6 into the corresponding gap 8a through the paper 6.
Press the joined body of the gars 1 to 7b and 8b on both sides of the card part 7b to bring the lower surface of the card part 7b into contact with the outer peripheral surfaces of the type drives l and 2, and at the same time bring the paper 6 into contact with the type surface of the type 3a. Perform printing.

As described above, this invention is based on the following: the guard part 7b made of one thin plate is arranged between the type rows of lower case letters, and the guard part 7b made of two thin plates is arranged between the type rows of upper case letters. 7a
, 7b are placed, by setting the thickness of each thin plate appropriately, a guard part with a thickness suitable for both lowercase letter rows and upper case letter rows can be placed. I can do that.

Furthermore, since the guard part of the type string of lowercase letters is made thinner than the guard part of the type string of upper case letters, the repulsive force by the guard part is smaller when printing lowercase letters than when printing uppercase letters, so as shown in Figure 5. For the lowercase letter string 3b, it is possible to use a hammer 4' which is smaller and has less striking force than the hammer 4 for printing uppercase letters, so it is possible to save stamping energy.

In addition, since the guard part between the uppercase letter rows is formed using two overlapping thin plates, compared to the conventional case where the guard part is formed using one thin plate with a thickness equal to the sum of the thicknesses of the two thin plates. Compared to this, the repulsive force of the guard portion is reduced, and the stamping force of the hammer 4 is not attenuated accordingly, so that capital letters can be printed more clearly.

In addition, by processing a thin plate that is thinner than the conventional thin plate and then pasting it on, it becomes easier to photo-etch the thin plate, improving mass production, and the width of the guard part can be made smaller than before. Since it is possible to process
It becomes easy to form a thin plate for preventing print stains that is compatible with a type drum having a narrow space between character rows.

In the above-mentioned embodiment of this invention, the gap in the thin plate is formed in the shape of a substantially rectangular window, but it may be formed in the shape of a comb, for example.

Further, in this embodiment, the thin plate 8 is arranged over the entire guard portion 7b of the thin plate 7, but the thin plate 8 may be arranged only in the portion of the guard portion adjacent to the hammer-engraved position. Two or more thin plates may be glued together to match the height of the type.

[Brief explanation of the drawing]

Figure 1 shows a conventional thin plate for preventing print smudges placed between the paper and the outer circumferential surface of the type drum, Figure 2 shows the same type of printing as shown in Figure 1, and Figure 3 shows this invention's method for preventing print smudges. FIG. 4 is an exploded perspective view of the printing smear prevention device of this invention, and FIG. It is a figure arranged between the outer peripheral surfaces. In the figure, 1 is an ink roller, 2 is a type drum, 3
a is a string of uppercase letters, 3b is a string of lowercase letters, 4,4'
is a hammer, 7 and 8 are thin plates for preventing printing stains, 7a and 8
a is a gap in the thin plate, and 7b. 8b is a thin plate guard portion.

Claims (1)

[Scope of Utility Model Registration Claim] An ink roller supported rotatably about a fixed axis relative to the machine frame, and an ink roller that contacts the outer peripheral surface of the ink roller about a fixed axis parallel to the rotating axis of the ink roller. A type drum that is rotatably supported on the machine frame and has a plurality of uppercase letter rows and lowercase letter rows with a lower print surface than the upper case letter surface arranged on the outer peripheral surface, and is arranged opposite to each character row on the type drum. A plurality of hammers that can be attached to and separated from the type,
Relating to a printing machine equipped with an elastic thin plate interposed between a type drum and a paper movement path and having a gap portion facing each type on the type drum and a card portion facing between each type row of a type tram. , The height of the lowercase letters is lower than that of the uppercase letters, and there are card sections facing each other between each row of letters.The uppercase letters are formed by a plurality of layered elastic thin plates, and the lowercase letters are formed by one sheet. A printing smear prevention device for a printing machine, characterized in that it is formed of a thin elastic plate.