JPH07380B2 - Blanket cylinder of offset rotary press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blanket cylinder of an offset rotary press,
In particular, it relates to a means for preventing a mixture of cleaning liquid, paper powder, ink, etc. from entering the groove of the blanket cylinder in which the blanket is wound and fixed.

[Conventional technology]

In an offset printing machine, when printing is continued for a certain period of time, paper dust, ink, etc. remain and accumulate on the blanket, and the blanket surface becomes dirty. In order to clean this dirt, there is a method of manually wiping the blanket surface by applying a cleaning liquid to the waste cloth, but as a means for automatically executing it, a blanket cleaning device as shown in FIGS. 5 and 6 is known. Has been.

In these figures, a pair of cloth supply rolls 8 and a cloth take-up roll 10 are supported by a pair of side plates 6 attached to frames on both sides of the printing machine main body, and are arranged on a rotation axis parallel to the rotation axis of the blanket cylinder 2. It is removable. Both ends of a belt-shaped cleaning cloth 12 are wound around the pair of rolls 8 and 10, and a predetermined tension is applied thereto.
The cloth take-up roll 10 is rotationally driven intermittently (for example, once every two seconds) at a predetermined speed by a drive device (not shown).

A stay 14 having a substantially T-shaped cross section is provided between the rolls 8 and 10 in parallel with the rotation axis direction of these rolls, and both ends thereof are fixed to the side plates 6. A portion of the stay 14 facing the blanket cylinder 2 is hollow, and a pressure pad 16 for pressing the cleaning cloth 12 is airtightly mounted on the facing surface.

The pressure chamber 18 formed by the tip portion of the stay 14 and the pressure pad 16 is connected to a compressor (not shown) provided outside, and expands the pressure pad 16 when air is supplied. The pressure pad 16 presses the cleaning cloth 12 which slides on the outer surface of the pressure pad 16 against the blanket cylinder 2. The cleaning cloth 12 is pressed to wipe the surface of the blanket 4 wound around the outer peripheral surface of the blanket cylinder 2,
To wash. Both ends of the blanket 4 are wound into a blanket winding groove 20 formed on the outer peripheral surface of the blanket cylinder 2 in parallel with the rotation axis of the blanket cylinder 2, and an appropriate tension is applied in the groove 20 by a pair of blanket winding shafts 22. It is locked in the state of keeping.

[Problems to be Solved by the Invention]

At the time of this cleaning, the mixture 24 of the cleaning liquid, paper powder, ink, etc. on the surface of the blanket 4 wiped off by the cleaning cloth 12 collects and adheres to the cleaning cloth 12 immediately after passing through the pressure pad 16. In such a state, when the gap 20a between the blankets 4 of the groove 20 of the blanket cylinder 2 passes through the pressure pad 16, the mixture 24 adhering to the cleaning cloth 12 is changed as shown in FIG.
As shown in the void (c), it is pushed into and attached to the gap 20a.

Therefore, if the gap 20a is extremely dirty, the mixture 24 may adhere to the surface of the printed paper to cause dirt, which has a drawback of deteriorating the quality of the printed material.

Therefore, after cleaning the blanket 4, the rotation of the blanket cylinder must be stopped and the worker must manually wipe off the mixture 24 that has entered the gap 20a with a cloth or the like. Such a manual gap 20a
The cleaning work requires a lot of labor and time, and there is a problem that the total printing work efficiency is reduced.

In order to prevent damaging water or cleaning liquid from entering the groove 20 and swelling the blanket 4 in the vicinity of the gap 20a around the back surface of the blanket 4 to prevent the blanket 4 from having an adverse effect on the life or print result, Blanket 4 in 20
A blanket in which strip-shaped elastic protrusions are provided in opposite positions on the surface side of the blanket 4 in the width direction of the blanket 4 is
Proposed as No. 5249.

However, in this method, although dampening water or cleaning liquid can be prevented from entering the groove 20 and rotating to the back surface side of the blanket 4, depending on how the blanket winding shafts 22a and 22b are wound,
The height of the upper surface of the elastic protrusion is not constant.

Therefore, in order to prevent the adhesion of the mixture 24 such as the cleaning liquid, the paper powder, and the ink, the height of the upper surface of the elastic protrusion and the height of the outer peripheral surface of the blanket should be approximately equal to each other.
22b needs to be finely adjusted, and further, the height of the elastic protrusion may gradually change as the printing progresses.

An object of the present invention is to provide a gap formed between the upper ends of the groove at both ends of the blanket wound in the groove of the blanket cylinder,
It is an object of the present invention to provide a blanket cylinder of an offset rotary press that fundamentally prevents a mixture of cleaning liquid, paper powder, ink, etc. from entering.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a blanket cylinder of an offset rotary press in which a groove for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface is formed in parallel with a rotation axis. Equipped with a gap bridge that closes the gap generated between the blankets at approximately the same height as the outer peripheral surface, and the gap bridge is installed in the head and the groove that are held at substantially the same height as the outer peripheral surface of the bracket. A blanket cylinder of an offset rotary press, which is made of an elastic member having a skirt that is widened when pressed and is brought into pressure contact with the rolled-in blanket.

In order to achieve the above-mentioned object, the present invention also provides a blanket cylinder of an offset rotary press in which a groove for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface is formed in parallel with a rotation axis. A gap bridge that closes a gap generated between the rolled up blankets at substantially the same height as the outer peripheral surface, and the gap bridge has a head that is held at substantially the same height as the outer peripheral surface of the blanket. A cracked elastic member having tapered screw holes formed at a plurality of positions in the direction of the rotation axis of the blanket, and a blanket that is screwed into the screw hole of the elastic member to widen the cracked portion. It proposes a blanket cylinder for an offset rotary press, which is composed of bolts to be pressed against each other.

In order to achieve the above object, the present invention further provides a blanket cylinder of an offset rotary press in which a groove for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface is formed in parallel with a rotation axis. A gap bridge that closes the gap generated between the wound blankets at approximately the same height as the outer peripheral surface, and the gap fringe has a head that is held at substantially the same height as the outer peripheral surface of the blanket. A cracked elastic member having holes formed at a plurality of positions in the rotation axis direction of the blanket toward the rotation axis, and a trapezoidal cross-section having a screw hole inside and inserted into the cracked portion of the elastic member from the front side. A bolt that is screwed into the threaded hole of the top from the outer peripheral surface side to widen the tip crack portion of the elastic member in the top and press-contact with the rolled-in blanket. It is intended to propose a blanket cylinder of a set rotary press.

[Action]

According to the present invention, since the gap formed between the groove upper ends of the blanket wound in the groove in the blanket cylinder is closed at approximately the same height as the outer peripheral surface of the blanket, the gap bridge is formed from the gap formed at the upper end. It is possible to completely prevent a mixture of cleaning liquid, paper dust, and squid from entering the groove.

That is, in the conventional dampening water / cleaning liquid intrusion prevention system in which the elastic projection is provided on the bracket itself, the height of the upper surface of the elastic projection is not constant depending on how the blanket winding shaft is wound. Uses a gap bridge that is mounted and fixed so that the height of the top surface is almost the same as the outer peripheral surface of the blanket, so regardless of how the blanket winding shaft is wound, the characteristics of the blanket, and the progress of printing, It is possible to prevent a mixture of cleaning liquid, paper powder, ink, etc. from entering the groove through the formed gap.

Therefore, it is not necessary to stop the rotation of the blanket cylinder after the cleaning of the blanket and the operator manually wipes the mixture that has entered the gap with a cloth or the like.

Therefore, the mixture of the cleaning liquid, the paper powder, the ink, etc., which has come out from the gap, does not adhere to the printing paper surface, and the problem that the quality of the printed material deteriorates no longer occurs.

Further, since the manual cleaning work of the gap is unnecessary, the printing work efficiency does not decrease.

〔Example〕

Next, FIGS. 1 to 4 and the above FIG. 5 showing a conventional example.
An embodiment of the present invention will be described with reference to FIG.

1 (a), (b), and (c) are side views showing the essential parts of a first embodiment of a blanket cylinder of an offset rotary press according to the present invention, a front view of a blanket cylinder equipped with a gap bridge, and a gap. It is a front view of a bridge.

In this embodiment, the gap bridge that closes the gap 20a generated at the groove upper end between the blankets 4 wound in the groove 20 at substantially the same height as the outer peripheral surface is held at substantially the same height as the outer peripheral surface of the blanket 4. The elastic member 50 has a head portion and a skirt that widens when fitted in the groove and comes into pressure contact with the rolled-in blanket.
In the skirt portion of the gap bridge 50, slits 50a may be formed at several positions in the longitudinal direction as shown in FIG. 1 (c) in order to facilitate the attachment / detachment to / from the blanket cylinder.

In the case of this embodiment, the blanket 4 is replaced with the blanket cylinder 2
After being wound around the blanket and fixed by the blanket winding shafts 22a and 22b, the gap bridge 50 is pushed from the side of the gap 20a toward the center of the blanket cylinder to reach the state of FIG. Complete the installation. In this state, the skirt portion of the gap bridge 50 is pressed against the groove portion of the blanket 4 and does not fall off.

To remove the gap bridge 50, insert a screwdriver tip or the like into the space inside the skirt and pull it up in the radial direction of the blanket cylinder 4 contrary to the above-mentioned installation, or apply a screwdriver or the like to the end face of the skirt to insert the blanket. It may be slid in the direction of the rotation axis of the body 4.

In this embodiment, when the blanket cleaning device as shown in FIG. 5 and FIG. 6 is operated, the cleaning liquid, paper dust,
It is possible to completely prevent a mixture such as ink from entering the groove 20.

Therefore, it is not necessary to wipe off the mixture 24 (in the conventional example shown in FIG. 7) that has entered the gap 20a after the cleaning of the blanket 4 is completed.

Therefore, the mixture 24 of the cleaning liquid, the paper dust, the ink, etc., which has come out from the gap 20a, does not adhere to the printing paper surface, and the problem that the quality of the printed matter deteriorates does not occur at all.

FIGS. 2 (a), (b), and (c) are a side view of a blanket cylinder showing a modified example of the embodiment of FIG. 1, a front view of a blanket cylinder with a gap bridge attached, and a front view of a gap bridge. .

In this modification, a gap bridge 52 is formed by changing the straight line of the sectional shape of the skirt portion of FIG. The gap bridge 52 is shown in FIG.
It is possible to provide a slit 52a corresponding to the slit 50a shown in FIG.

Since the function and effect of this modification are the same as those of the embodiment shown in FIG. 1, description thereof will be omitted.

3 (a), (b), and (c) are side views showing the essential parts of a second embodiment of the blanket cylinder of the offset rotary press according to the present invention, drawings showing the detailed structure of the gap bridge, and gap bridge. It is the whole front view.

In this embodiment, the gap bridge has a head portion which is held at substantially the same height as the blanket 4 and has a plurality of places in the rotation axis direction of the blanket 4 in which taper screw holes are formed toward the rotation axis. The elastic member 60 and the bolt 62 screwed into the screw hole of the elastic member 60 to widen the previously cracked portion and press it into contact with the wound blanket 4 are combined.

In the case of this embodiment, the blanket 4 is replaced with the blanket cylinder 2
After being wound around and fixed by the blanket winding shafts 22a and 22b, the tip elastic member 60 is pushed from the gap 20a side toward the center of the blanket cylinder. Next, when the hexagon socket head cap screw 62 is screwed in, the tip crack elastic member 60
The tip cracked portion is pushed open and pressed against the rolled-in portion of the blanket 4 to complete the installation of the gap bridge. In this state, the tip portion of the tip elastic member 60 comes into pressure contact with the inside of the groove of the blanket 4 and does not fall off.

To remove the gap bridge, the hexagon socket head cap screw 62 may be reversed and pulled out, and then a screwdriver or the like may be applied to the end surface of the tip cracking member 60 and slid in the direction of the rotation axis of the blanket cylinder 4.

Also in this embodiment, when the blanket cleaning device is operated, the gap 20a is generated due to the gap bridge 60.
Therefore, it is possible to completely prevent the mixture of the cleaning liquid, the paper powder, the ink and the like from entering the groove 20.

Therefore, it is not necessary to wipe off the mixture 24 that has entered the gap 20a after cleaning the blanket 4.

Therefore, the mixture 24 of the cleaning liquid, the paper dust, the ink, etc., which has come out from the gap 20a, does not adhere to the printing paper surface, and the problem that the quality of the printed matter deteriorates does not occur at all.

4 (a), (b) and (c) are side views showing the essential parts of a third embodiment of the blanket cylinder of the offset rotary press according to the present invention, a view showing the detailed structure of the gap bridge, and a gap bridge. It is the whole front view.

The gap bridge has a head portion that is held at substantially the same height as the blanket 4 and has a plurality of cracked elastic members 64 in which holes are formed at a plurality of positions in the rotation axis direction of the blanket 4 toward the rotation axis. A top 68 having a trapezoidal cross section and having a screw hole in the tip of the elastic member 64 and inserted from the front side, and the top 68 screwed into the screw hole of the top 68 from the outer peripheral surface side.
In addition, the elastic member 64 is widened at the front crack portion and is combined with the hexagon socket head cap screw 66 that is pressed against the rolled-in blanket 4.

In order to prevent the top 68 from falling off when the hexagon socket head bolt 66 is rotated, it is desirable to prevent the bolt 66 from coming off the top 68 with a stopper 70 or the like.

In the case of this embodiment, the blanket 4 is replaced with the blanket cylinder 2
After being fastened around the blanket and fixed by the blanket winding shafts 22a and 22b, from the gap 20a side toward the center of the blanket cylinder, with the top 68 lowered to the bottom as shown in FIG. 4 (b), Push in the elastic member 64. next,
When the hexagon socket head cap screw 66 is rotated, the tip crack portion of the tip crack elastic member 64 is pushed open by the inclined surface of the top 68 and pressure-contacts the rolled-in portion of the blanket 4 and pressure-contacts the portion inside the groove for mounting the gap bridge. However, it does not fall out.

In order to remove the gap bridge, the hexagon socket head cap screw 66 is reversed and brought into the state shown in FIG. 4 (b) again, and then a screwdriver or the like is applied to the end surface of the tip-breaking member 64 to rotate the rotary shaft of the blanket cylinder 4. You can slide it in the direction.

Also in this embodiment, when the blanket cleaning device is activated, the gap 20a is formed due to the gap bridge 64.
Therefore, it is possible to completely prevent the mixture of the cleaning liquid, the paper powder, the ink and the like from entering the groove 20.

Therefore, it is not necessary to wipe off the mixture 24 that has entered the gap 20a after the cleaning of the bracket 4 is completed.

Therefore, the mixture 24 of the cleaning liquid, the paper dust, the ink, etc., which has come out from the gap 20a, does not adhere to the printing paper surface, and the problem that the quality of the printed matter deteriorates does not occur at all.

In this embodiment, the gap between the cracked portions shown in FIG. 4 (c) is wider than the slits 50a and the like of the other embodiments, but the gaps may be formed to have the same width as the slits 50a and the like. Of course good things.

〔The invention's effect〕

According to the present invention, in the gap formed between the groove upper ends of the both ends of the blanket wound in the groove of the blanket cylinder,
Since a blanket cylinder of an offset rotary press equipped with a gap bridge that fundamentally prevents the mixture of cleaning liquid, paper dust, ink, etc. from entering, after cleaning the blanket cylinder, the mixture that has entered the gap as in the past can be removed. It does not need to be wiped off and there is no problem of reduced print quality due to this mixture.

[Brief description of drawings]

1 (a), (b) and (c) are side sectional views showing the essential parts of a first embodiment of a blanket cylinder of an offset rotary press according to the present invention, a front view of a blanket cylinder equipped with a gap bridge, Front view of the gap bridge, FIG. 2 (a),
(B) and (c) are side sectional views of a blanket cylinder showing a modified example of FIG. 1 embodiment, a front view of a blanket cylinder equipped with a gap bridge, a front view of a gap bridge, and a third view.
(A), (b), (c) is a side sectional view showing a main part of a second embodiment of a blanket cylinder of an offset rotary press according to the present invention, a view showing a detailed structure of a gap bridge, and an entire gap bridge. Front view of FIG. 4, (a), (b),
(C) is a side sectional view showing a main part of a third embodiment of a blanket cylinder of an offset rotary press according to the present invention, a view showing a detailed structure of a gap bridge, a front view of the entire gap bridge, and FIG. 5 is a blanket. FIG. 6 is a perspective view showing the structure of an example of a cylinder cleaning device, FIG. 6 is a side view showing the relationship between a conventional blanket cylinder and the blanket cylinder cleaning device of FIG. 5, and FIG. 7 is a view showing the operating state of the device of FIG. Is. 2 ... Blanket cylinder, 4 ... Blanket, 6 ... Side plate, 8 ... Cloth supply roll, 10 ... Cloth take-up roll, 12 ...
Cleaning cloth, 14-stay, 16-pressure pad, 18-pressure chamber, 20-groove, 20a-gap, 22a, 22b-blanket winding shaft, 24-cleaning liquid, paper dust, ink, etc. 50 …… Gap bridge (elastic member), 50a …… Slit, 52 …… Gap bridge (elastic member), 60 …… Gap bridge (Split elastic member), 62 …… Hexagon socket head cap screw, 64… … Gap bridge (breaking elastic member), 66 …… Hexagon socket head cap bolt, 68… Top, 70… Stopper.

Claims (3)

[Claims] 1. A blanket cylinder of an offset rotary press in which grooves for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface are formed in parallel with a rotation axis, and occur between the rolled-up blankets at the upper ends of the grooves. A gap bridge is provided to close the gap at substantially the same height as the outer peripheral surface, and the gap bridge widens when mounted in the head and the groove held at substantially the same height as the outer peripheral surface of the blanket. And a blanket cylinder of an offset rotary press, which comprises an elastic member having the rolled-in blanket and a skirt in pressure contact. 2. A blanket cylinder of an offset rotary press in which grooves for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface are formed in parallel with a rotation axis, and occur between the blankets at the upper ends of the grooves. A gap bridge that closes the gap at substantially the same height as the outer peripheral surface, wherein the gap bridge has a head that is held at substantially the same height as the outer peripheral surface of the blanket, It comprises a pre-cracked elastic member having a tapered screw hole formed at a point toward the rotary shaft, and a bolt screwed into the screw hole of the elastic member to widen the pre-cracked portion and press it into contact with the rolled-in blanket. A blanket cylinder for an offset rotary press. 3. A blanket cylinder of an offset rotary press in which grooves for winding and fixing both ends of a sheet-shaped blanket wound around an outer peripheral surface are formed in parallel with a rotation axis, and occur between the blankets at the upper ends of the grooves. A gap bridge that closes the gap at substantially the same height as the outer peripheral surface, wherein the gap bridge has a head that is held at substantially the same height as the outer peripheral surface of the blanket, A cracked elastic member having a hole formed at a location toward the rotary shaft, and a trapezoidal cross section having a screw hole inside and inserted into the cracked portion of the elastic member from the front side.
A blanket cylinder for an offset rotary press, comprising: a bolt screwed into the threaded hole of the top from the outer peripheral surface side to widen a tip crack portion of the elastic member in the top to press the rolled blanket into pressure contact.