JPH0739649Y2 - Printing plate bending device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for extending a bent portion of a printing plate removed from a plate cylinder of a printing machine so that the bent portion is substantially flat.

[0002]

2. Description of the Related Art A printing plate removed from a plate cylinder of a printing machine has a fold mark left on the same line indicated by L ₁ , L ₂ and L ₃ in FIG. Of these, the bent portion in L ₁ is a portion that becomes a locking portion for mounting the printing plate on the outer peripheral surface of the cylindrical plate cylinder, and the bent portion in L ₂ and L ₃ is the cylindrical plate. It is a portion that becomes a folded portion when the printing plate is mounted on the outer peripheral surface of the cylinder.

[0003]

The work of mounting this printing plate on the plate cylinder, or the work of detaching it from the plate cylinder, so-called replacement work, has conventionally been performed artificially. In this case, even if the shape of the printing plate is as shown in FIG. 10, there is no problem in the replacement work. However, in recent years, an automatic changer has been developed so that the printing plate can be automatically mounted on the plate cylinder or, conversely, can be removed from the plate cylinder. Due to the function of this automatic changer, if the printing plate had the shape shown in FIG. 10, it would not be possible to mount it on the automatic changer, so the folds at L ₁ , L ₂ and L ₃ should be extended. At least that portion needs to be almost flat as shown in FIG.

[0004]

SUMMARY OF THE INVENTION The present invention has been developed for automatically performing this work, and is directed to the direction in which a partially bent printing plate on the same line should be conveyed. A groove is formed on the outer peripheral surface of a plurality of straightening rollers arranged in parallel so as to be orthogonal to each other, the inclination angle of which gradually decreases as it goes downstream in the transport direction of the printing plate to be straightened.

Further, on the outer peripheral surface of a plurality of straightening rollers arranged in parallel so as to be orthogonal to the direction in which the printing plate partially folded on the same line is to be transported, the direction of transport of the printing plate to be straightened is determined. While forming a groove in which the inclination angle gradually decreases as it goes downstream, a roller paired with at least one of the plurality of straightening rollers is arranged at a predetermined position different from the groove.

[0006]

Operation: A plurality of bent printing plates P ₀ are arranged in parallel so that the portion outside the bent portion at L ₁ in FIG. 10 is in each groove shown by 1 to 5 in FIG. Straightening rollers R ₁ ~ R ₅
As shown in (a) to (e) of FIG. 9, while it passes through the straightening rollers R _{1 to} R ₅ , the inclined surfaces of the grooves 1 to 5 gradually decrease the inclination angle to P ₁ .. are sequentially corrected as shown by P ₅ , and the bent portion at L ₁ is almost flat as shown in FIG.

Further, in the way during this print transport, one at least of the plurality of straightening rollers R ₁ to R _5, for example by R _8, R ₈ to be R ₃ and pairs, FIG. 10 of
The L ₂ and L ₃ lines are pressed, and as shown in FIG. 11, both bent portions of L ₂ and L ₃ become substantially flat.

[0008]

Embodiments of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, five straightening rollers R _{1 to} R ₅ are arranged in parallel. Each of the straightening rollers R _{1 to} R ₅ conveys one printing plate to be straightened, that is, a printing plate partially bent on the same line L ₁ , L ₂ , L ₃ as shown in FIG. They are arranged in parallel so as to be orthogonal to the power direction (from the bottom to the top in the case of FIG. 1). On the outer peripheral surface of each of the straightening rollers R _{1 to} R ₅ , there are provided grooves 1 to 5 in which the inclination angle gradually becomes gentle as it goes downstream in the transport direction of the printing plate (as it goes upward in the case of FIG. 1). Form on the same line.

Each of the straightening rollers R _{1 to} R ₅ in the embodiment is located on the lower side of the pair of upper and lower rollers, and on the upper side thereof, the straightening rollers R _{1 to} R ₅ are arranged as shown in FIGS. 2 and 3. Rollers R _{6 to} R ₁₀ are arranged so as to be paired with R _{1 to} R ₅ . In addition, the conveyance direction of the printing plate in the case of FIGS. 2 and 3 is from the left side to the right side of the drawing.

In the embodiment, the printing plate P to be straightened
_The upper roller R ₆ paired with the _first straightening roller R ₁ in ₀ (FIG. 10) is a brush roller. Laura R ₆
The brush roller is the printing plate P ₀ (Fig. 1
0) is first sent between the pair of upper and lower rollers R _{1 to} R ₆ ,
This is because the extremely rising portion (the rising portion on the right side of the L ₁ portion in FIG. 10) is squeezed to be flat as a whole. As shown in FIG. 4, the roller R ₆ has the same width as the correction roller R ₁ located on the lower side.

Further, in the embodiment, the upper roller R ₈ paired with the _third correction roller R ₃ in the conveying direction of the printing plate P ₀ (FIG. 10) to be corrected is a lower correction roller R 3. ₃
Groove from place two at predetermined intervals, Moreover, the rollers R _8, R ₈ is as very thin as compared to the other roller _{R 6, R 7, R 9} , R 10 ( see FIG. 6 ). This roller R ₈ ,
R ₈ presses L ₂ and L ₃ portions in FIG. 10 to flatten the bent portion when the printing plate P ₃ being straightened is fed between the lowering straightening roller R ₃ and the straightening roller R ₃ . It is useful for aligning the bent portion of L ₁ in the groove of the straightening roller and also for straightening the L ₂ and L ₃ portions of the printing plate being straightened by the inclined surface thereof.

It should be noted that, except for R ₈ among the rollers R _{6 to} R ₁₀ located on the upper side, all of them have the same width as the lower straightening roller paired with them. Further, as shown in FIGS. 1 and 4 to 8, the straightening rollers R _{1 to} R ₅ cover most of the portions except the grooves 1 to 5 with a synthetic resin material having a predetermined hardness. Of the rolls R _{6 to} R ₁₀ , R ₇ , R ₉ , and R ₁₀ are also entirely covered with a synthetic resin material having a predetermined hardness.

A pair of upper and lower rollers arranged side by side in this way are synchronously rotated in the direction of the arrow in FIG. 3, and the printing plate P ₀ (FIG. 1) to be corrected between the pair of upper and lower rollers.
0), the bent part at L ₁ and L ₂ , L ₃
The bent portion at is corrected so that it can be made substantially flat as shown in FIG. Next, the working conditions are shown in the order of steps. In the embodiment, the table 6 is arranged in front of a pair of upper and lower rollers arranged in parallel as shown in FIGS. 1 and 2. Guide grooves 7 are formed on the same line as the grooves 1 to ₅ of the correction rollers R _{1 to} R ₅ located on the lower side (see FIG. 1). Therefore, when the portion of the printing plate P ₀ (FIG. 10) to be straightened to the left of L ₁ is inserted into this guide groove 7 and pushed toward the rollers arranged in parallel, the straightening rollers R _{1 to} R ₅ The part can be located on each groove 1-5.

[0014] to be corrected printing plate P ₀ (FIG. 10) is fed between the first straightening roller R ₁ and the brush roller R ₆ which is rotating in the arrow direction of FIG. 3, FIG. 9 (a) At P ₁ , the inclined surface of the groove 1 of the first straightening roller R ₁ slightly straightens the portion outside L ₁ (on the left side in the drawing). Also, the rising part on the right side of that is the upper brush roller.
Squeezed with R ₆ and flatter than ever.

Next, when the printing plate being straightened is fed between the second straightening roller R ₂ and the roller R ₇ which are rotating in the direction of the arrow in FIG. 3, at P ₂ in FIG. 9 (b). As shown, the inclined surface of the groove 2 of the second straightening roller R ₂ further straightens the portion outside L ₁ (on the left side in the drawing). Further, the portion on the right side that is squeezed by the brush roller R ₆ in the previous stage is entirely pressed by the lower correction roller R ₂ and the upper roller R ₇ .

Next, when this printing plate P ₂ is fed between the third straightening roller rotating in the direction of the arrow in FIG. 3 and the rollers R ₈ and R ₈ , P ₃ in FIG. 9 (c). 3rd as shown
The inclined surface of the groove 3 of the straightening roller R ₃ further straightens the portion outside L ₁ (on the left side in the figure). Then, here, the rollers R ₈ and R _{8 on the} upper side press the lines of L ₂ and L ₃ , and the streaks can be made as small as possible.

Further, when this printing plate P ₃ is fed between the fourth straightening roller R ₄ and the roller R ₉ which are rotating in the arrow direction of FIG. 3, it is shown by P ₄ in FIG. 9 (d). Thus, the inclined surface of the groove 4 of the fourth straightening roller R ₄ further straightens the portion outside L ₁ (on the left side in the drawing).

The printing plate P ₄ is rotated in the direction of the arrow shown in FIG. 3, and is a fifth (last in the embodiment) straightening roller R ₅
And when fed between the rollers R _10, a part of the outside of the L ₁ by the inclined surface of the groove 5 of the fifth correction roller R ₅ as indicated by P ₅ in FIG. 9 (e) (the left side in the figure) Further corrected,
The printing plate P ₅ sent from both rollers is substantially flat as shown in FIG.

In the embodiment, as shown in FIG. 11, the portion outside L ₁ (on the left side of the figure) is corrected only to a degree slightly lower in the drawing, which is the automatic changer described above. This is because it is easy to mount the corrected printing plate on the plate cylinder of the printing machine using. When it is desired to straighten the plate completely, the printing plate P ₅ may be further inserted into a straightening roller having no inclined surface.

As described above, the bending portion at L ₁ in FIG. 10 can be corrected by the conveyance of the printing plate to be corrected by the grooves 1 to ₅ of the correction rollers R _{1 to} R ₅ arranged in parallel. This is because it becomes gradually looser as it goes downstream in the direction, and by such means, it is possible to correct the bent portion to be corrected very easily and accurately. In the embodiment, the straightening rollers R _{1 to} R ₅ are arranged on the lower side, but they may be arranged on the upper side and the printing plate may be turned upside down as compared with the case of FIG. Good.

In the embodiment shown in FIG. 2, an ink cleaning device 8, a plate surface protection device 9 and a drying device 1 are provided downstream of the straightening device of the present invention.
0s are directly connected to each other, the ink adhering to the corrected printing plate is washed, and the plate surface is coated with a special chemical or rubber so that it can be taken out in a dried state. It is a thing. An automatic plate making machine is arranged immediately after the drying device 10, and a corrected and processed printing plate can be leaned against the automatic plate making machine.

[0022]

According to the straightening device of the present invention, the bent portion of the printing plate to be straightened can be straightened very easily and accurately by a simple means.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention showing an arrangement state of correction rollers.

FIG. 2 is a schematic view showing a state in which an ink cleaning device, a plate surface protection device, and a drying device are directly connected to the straightening device shown in the embodiment.

FIG. 3 is a schematic side view showing an embodiment of the present invention.

FIG. 4 is a front view of a X ₁ -X ₁ portion of FIG. 3.

5 is a front view of X ₂ -X ₂ parts of FIG.

6 is a front view of X ₃ -X ₃ parts of FIG.

FIG. 7 is a front view of a portion X ₄ -X ₄ in FIG.

8 is a front view of X ₅ -X ₅ parts of FIG.

FIG. 9 is a front view showing the correction work status of the printing plate in the order of steps.

FIG. 10 is a front view of the printing plate before straightening.

FIG. 11 is a front view of the printing plate after straightening.

[Explanation of symbols]

R _{1 to} R ₅ ... Straightening roller, R _{6 to} R ₁₀ ... Roller, 1 to 5 ...
Groove, P ₀ ~P ₅ ... Print version

Claims (2)

[Scope of utility model registration request] 1. A downstream side of a printing plate to be straightened on the outer peripheral surface of a plurality of straightening rollers arranged in parallel so as to be orthogonal to the direction in which the printing plate partially bent on the same line is transported. An apparatus for correcting a bent portion of a printing plate, characterized in that a groove having a gradually decreasing inclination angle is formed as it goes to. 2. A downstream side of a printing plate to be straightened in the outer peripheral surface of a plurality of straightening rollers arranged in parallel so as to be orthogonal to the direction in which the printing plate partially bent on the same line is to be transported. Forming a groove of which the inclination angle gradually becomes gentler as it goes to, while a roller paired with at least one of the plurality of straightening rollers is arranged at a predetermined position different from the groove. Bend correction device.