JPH03133644A - Blanket cylinder of offset rotary press - Google Patents

Abstract

PURPOSE:To prevent an mixture of a washing liquid, dusts, ink, and others from invading into a gap by providing a gap bridge which covers the gap produced between the ends of a blanket wound at the upper end of a groove to be nearly flush with the outer circumferential surface. CONSTITUTION:A gap bridge which covers a gap produced at the upper end of a groove 20 between the ends of a blanket 4 wound into the groove 20 to be nearly flush with the outer circumferential surface is composed of an inverted L-shape member 30 having one edge held to be nearly level with the outer circumferential surface of the blanket 4 and a fitment 32 fixing the inverted L-shape member 30 to the blanket 4. A material of the inverted L-shape member 30 is not limited to a metal, but a hard plastic and the like may be used. The blanket 4 with the gap bridge 30 fixed is wound around the outer circumference of a blanket cylinder 2. The both ends are inserted from the upper end of the groove 20 to be fitted into slits of blanket winding shafts 22a, 22b. Then, the blanket 4 is windingly fastened so that the top surface of the gap bridge 30 is made to be nearly flush with the pheripheral surface of the blanket 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a planner cylinder of an offset rotary press, and in particular, a mixture of cleaning liquid, paper powder, ink, etc. This relates to means for preventing the intrusion of

[Conventional technology]

In an offset printing machine, if printing continues for a certain period of time, paper dust, ink, etc. remain on the blanket and accumulate, resulting in the blanket surface becoming dirty. To clean this dirt, there is a method of manually wiping the surface of the blanket with a cleaning solution soaked in a cloth, but as a means of automatically wiping the surface of the blanket, a blanket cleaning device as shown in Figures 7 and 8 is available. Are known. In these figures, a pair of cloth supply rolls 8 and a cloth take-up roll 1o are supported by a pair of side plates 6 attached to frames on both sides of the printing press body, and the rotation axis is 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 1o, and a predetermined tension is applied thereto. Cloth winding roll 1o
is rotated 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 to the rotation axis direction of these rolls, and both ends are fixed to the side plate 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 attached to this facing surface. Stay 14
The pressure chamber 18 formed by the tip of the pressure pad 16 is connected to an external compressor (not shown), and when air is supplied, the pressure chamber 18 is formed by the pressure pad 16.
Inflate 6. This pressure pad 16 presses the moving cleaning cloth 12 against the blanket cylinder 2 by sliding on its outer surface. The cleaning cloth 12 is pressed and the blanket cylinder 2
The surface of the blanket 4 wound around the outer peripheral surface of the blanket 4 is wiped and washed. Both ends of the blanket 4 are rolled up into grooves 20 for blanket winding formed on the outer circumferential surface of the blanket cylinder 2 in parallel with the rotational axis of the blanket cylinder 2. It is locked in a state where the tension is maintained.

[Problem to be solved by the invention]

During this cleaning, the mixture 24 of the cleaning liquid 2, paper powder, ink, etc. on the surface of the blanket 4 wiped off by the cleaning cloth 12 accumulates and adheres to the cleaning cloth 12 immediately after passing through the breather pad 16. In this state, the groove 2 of the blanket cylinder 2
When the gap 20a between the blankets 4 of 0 passes through the pressure pad 16, the mixture 24 adhering to the cleaning cloth 12
is pushed into the gap 20a and adheres, as shown in FIGS. 9(b) and (Q).

Therefore, if the gap 20a is severely soiled, the mixture 24 may adhere to the surface of the printed paper and become smudged, which has the disadvantage of degrading the quality of the printed material.

Therefore, after cleaning the blanket 4, the rotation of the blanket cylinder had to be stopped, and the operator had to manually wipe off the mixture 24 that had entered the gap 20a using a cloth or the like. Such manual cleaning work of the gap 20a requires a lot of labor and time.
There was a problem that the overall printing work efficiency was reduced.

An object of the present invention is to reduce the gap that occurs between the upper ends of the grooves of both ends of the blanket caught in the grooves of the blanket cylinder.
To provide a blanket cylinder for an offset rotary press that fundamentally prevents a mixture of cleaning liquid 2, paper powder, ink, etc., from entering.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a blanket cylinder for an offset rotary press in which a groove for winding and fixing both ends of a sheet-like blanket wound around the outer peripheral surface is formed parallel to the rotation axis. The present invention proposes a blanket cylinder for an offset rotary press, which is equipped with a gear bridge that closes a gap between rolled up blankets at approximately the same height as the outer circumferential surface.

Specifically, the gap bridge includes an inverted-shaped member having one side held at approximately the same height as the outer peripheral surface of the blanket, and a metal fitting for fixing this inverted-shaped member to the blanket.

The gap bridge may be a blade that is formed integrally with the blanket and extends across the width of the gap from upstream in the rotational direction at approximately the same height as the outer peripheral surface of the blanket.

The gap bridge further includes an elastic member having a head held at approximately the same height as the outer circumferential surface of the blanket and a skirt that widens when installed in the groove and comes into pressure contact with the rolled-up blanket. It is also possible to do so.

The gap bridge further includes a split elastic member having a head held at approximately the same height as the blanket and having screw holes tapered toward the rotation axis formed at multiple locations in the direction of the rotation axis of the blanket. The elastic member may be combined with a bolt that is screwed into a screw hole of the elastic member to widen the split end portion and press the rolled-up blanket into contact with the bolt.

The gap bridge includes a split elastic member having a head held at approximately the same height as the blanket and having holes formed at multiple locations in the direction of the rotation axis of the blanket, and a screw hole inside. a top having a trapezoidal cross section that is inserted into the split end of the elastic member from the front side; This can also be achieved by using bolts that are pressed into contact with the blanket.

[Function] The present invention includes a gap bridge that closes the gap formed between the upper ends of the grooves of the blanket caught in the grooves in the blanket cylinder at approximately the same height as the outer peripheral surface of the blanket. It is possible to completely prevent a mixture of cleaning liquid 2, paper powder, ink, etc., from entering the groove through the gap formed by the cleaning liquid.

Therefore, after the blanket has been washed, there is no need for the operator to stop the rotation of the blanket cylinder and manually wipe off the mixture that has entered the gap using a cloth or the like.

Therefore, the mixture of the cleaning liquid, paper powder, ink, etc. that comes out of the gap does not adhere to the surface of the printed paper, and the problem of deterioration of the quality of printed matter no longer occurs.

Furthermore, since there is no need for manual gap cleaning work, there is no reduction in printing work efficiency.

〔Example〕

Next, the present invention will be explained in detail with reference to FIGS. 1 to 6.

FIGS. 1(a), (b), and (c) are side sectional views showing the main parts of the first embodiment of the blanket cylinder of the offset rotary press according to the present invention, and the gap bridge and its fixing fittings are attached to the blanket cylinder. Developed diagram.

FIG.

In this embodiment, a gap bridge that closes a gap 20a generated at the upper end of the groove between the blankets 4 caught in the groove 20 at approximately the same height as the outer peripheral surface is maintained at approximately the same height as the outer peripheral surface of the blanket 4. It is composed of an inverted-shaped member 3o having one side that is curved, and a metal fitting 32 for fixing this inverted-shaped member 30 to the blanket 4. The material of the inverted-shaped member 3o is not limited to metal, and may be hard plastic or the like.

The inverted cone-shaped member 3o is fixed to the blanket 4 before the blanket 4 is attached to the blanket cylinder 2, as shown in FIGS. 1(b) and 1(Q). A blanket winding shaft 22a is arranged in the groove 20 by winding the gap bridge 30 fixed to the blanket 4 around the outer circumferential surface of the blanket cylinder 2 and inserting both ends thereof from the upper end of the groove 20.

22b, and rotate these blanket winding shafts 22a and 22b clockwise.

Rotate counterclockwise to tighten the blanket 4 so that the height of the upper surface of the gap bridge 30 approximately matches the outer peripheral surface of the blanket 4.

In this embodiment, when the blanket cleaning device as shown in FIGS. 7 and 8 is operated, water is removed from the gap 20a because of the gap bridge 3o.
The cleaning liquid 9 can completely prevent mixtures of paper powder, ink, etc. from entering the grooves 20.

Therefore, after cleaning the blanket 4, it is necessary to stop the rotation of the blanket cylinder 2 and manually wipe off the mixture 24 that has entered the gap 20a (in the conventional example shown in FIG. 9) using a cloth or the like. disappears.

Therefore, the mixture 24 of the cleaning liquid 2, paper powder, ink, etc. that comes out of the gap 20a does not adhere to the surface of the printed paper, and there is no problem that the quality of the printed matter deteriorates.

FIGS. 2(a), (b), and (Q) are a side view showing a main part of a second embodiment of a blanket cylinder for an offset rotary press according to the present invention, a developed view of the blanket with a gap bridge formed thereon, and a side view. It is.

In this embodiment, the gap bridge is a blade 40 that is formed integrally with the blanket 4 and extends from upstream in the rotation direction over the width of the gap 20a at approximately the same height as the outer peripheral surface of the blanket 4. It is. Here, integrally forming does not necessarily mean molding the blanket 4 at the same time. That is, the tongue piece 4o may be molded separately from the blanket 4 and then bonded to the blanket 4. At that time, the material of the tongue piece 40 may be changed from that of the blanket 4. The width of the tongue piece 40 in the direction of the outer circumferential surface of the blanket cylinder is necessary to at least cover the gap 20a, and the width of the tongue piece 40 in the direction of the outer circumferential surface of the blanket cylinder must be sufficient to cover at least the gap 20a.
There is no problem even if the length slightly covers the bent portion of the blanket 4 on the side 2a.

In this embodiment as well, when the blanket cleaning device is operated, because of the gap bridge 40, the gap 2
From 0a, it is possible to completely prevent the mixture of the cleaning liquid 2, paper powder, ink, etc., from entering the groove 20.

Therefore, after cleaning the blanket 4, there is no need to wipe off the mixture 24 that has entered the gap 20a.

Therefore, the mixture 24 of the cleaning liquid 9, paper powder, ink, etc. that comes out of the gap 20a does not adhere to the surface of the printed paper, and there is no problem that the quality of the printed matter deteriorates.

3(a), (b), and (c) are a side view showing a main part of a third embodiment of a blanket cylinder for an offset rotary press according to the present invention, a front view of the blanket cylinder equipped with a gap bridge, and a gap FIG. 3 is a front view of the bridge.

In this embodiment, the gap bridge has a head that is held at approximately the same height as the outer circumferential surface of the blanket 4, and a skirt that widens when installed in the groove and comes into pressure contact with the rolled-up blanket. This is an elastic member 50. As shown in FIG. 3(c), slits 50a may be formed in the skirt portion of the gap bridge 50 at several locations in the longitudinal direction in order to facilitate attachment and detachment from the blanket cylinder.

In the case of this embodiment, the blanket 4 is connected to the blanket cylinder 2.
The blanket winding shafts 22a, 2
2b, the gap bridge 50 is pushed in from the gap 20a side toward the center of the blanket cylinder to reach the state shown in FIG. 3(a).
Complete installation of 0. In this state, the skirt portion of the gap bridge 50 comes into pressure contact with the portion of the blanket 4 in the groove, and does not fall off. In addition, gap bridge 5
To remove the blanket cylinder 4, insert the tip of a screwdriver 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 process, or apply a screwdriver or the like to the end of the skirt to remove the blanket cylinder 4. Just slide it in the direction of the rotation axis.

In this embodiment as well, when the blanket cleaning device is operated, because of the gap bridge 50, the gap 2
From 0a, it is possible to completely prevent the mixture of the cleaning liquid 2, paper powder, ink, etc., from entering the groove 20.

Therefore, after cleaning the blanket 4, there is no need to wipe off the mixture 24 that has entered the gap 20a.

Therefore, the mixture 24 of the cleaning liquid 2, paper powder, ink, etc. that comes out of the gap 20a does not adhere to the surface of the printed paper, and there is no problem that the quality of the printed matter deteriorates.

FIGS. 4(a), (b), and (c) are a side view of a blanket cylinder showing a modification of the embodiment shown in FIG. 3, a front view of the blanket cylinder equipped with a gap bridge, and a front view of the gap bridge. .

This modification is a gap bridge 52 in which the cross-sectional shape of the skirt portion of the embodiment in FIG. 3 is changed from a straight line to a curved line. In addition, the gap bridge 52 is shown in FIG.
The slit 50a in FIG. 3(c) is placed in the skirt part of Q).
It is also possible to provide a slit 52a corresponding to the slit 52a.

The effects of this modification are the same as those of the embodiment shown in FIG. 3, so the explanation will be omitted.

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

In this embodiment, the gap bridge has a head that is held at approximately the same height as the blanket 4, and has screw holes tapered toward the rotation axis of the blanket 4 at multiple locations in the direction of the rotation axis. This is a combination of an elastic member 60 and a bolt 62 that is screwed into a screw hole of the elastic member 60 to widen the split end portion and press it against the wrapped blanket 4.

In the case of this embodiment, the blanket 4 is connected to the blanket cylinder 2.
The blanket winding shafts 22a, 2
2b, the split elastic member 60 is pushed in from the gap 20a side toward the center of the blanket cylinder. Next, when the hexagon socket head bolt 62 is screwed in, the split end portion of the split end elastic member 60 is pushed open and comes into pressure contact with the wrapped portion of the blanket 4, completing installation of the gap bridge. In this state, the split end portion of the split elastic member 60 comes into pressure contact with the portion within the groove of the blanket 4, and does not fall off. To remove the gap bridge, reverse the hexagon socket head bolt 62 and remove it, then remove the split end member 6.
What is necessary is to apply a screwdriver or the like to the end face of the blanket cylinder 4 and slide it in the direction of the rotation axis of the blanket cylinder 4.

In this embodiment as well, when the blanket cleaning device is operated, because of the gap bridge 60, the gap 2
From 0a, it is possible to completely prevent the mixture of the cleaning liquid 2, paper powder, ink, etc., from entering the groove 20.

Therefore, after cleaning the blanket 4, there is no need to wipe off the mixture 24 that has entered the gap 20a.

Therefore, the mixture 24 of the cleaning liquid 7, paper powder, ink, etc. coming out of the gap 20a does not adhere to the surface of the printed paper, and there is no problem that the quality of the printed matter deteriorates.

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

The gap bridge includes a split elastic member 64 having a head portion held at approximately the same height as the blanket 4 and having holes formed at a plurality of locations in the direction of the rotation axis of the blanket 4; The elastic member 6 has a screw hole in the elastic member 6.
A top 68 with a trapezoidal cross section is inserted from the tip side into the tip split part of 4.
and a hexagonal socket head bolt 66 which is screwed into the threaded hole of the top 68 from the outer circumferential surface side and causes the top 68 to widen the split end of the elastic member 64 and come into pressure contact with the rolled up blanket 4. be. Note that in order to prevent the top 68 of the bolt 66 from falling off when the hexagon socket head bolt 66 is rotated, a stopper 70 or the like is used to prevent the top 68 of the bolt 66 from falling off.
It is desirable to eliminate omissions.

In the case of this embodiment, the blanket 4 is connected to the blanket cylinder 2.
The blanket winding shafts 22a, 2
2b, move the top 68 from the gap 20a side toward the center of the blanket cylinder as shown in FIG. 6(b).
With the tip lowered to the lowest position, push in the split end elastic member 64. Next, when the hexagonal socket bolt 66 is rotated, the split end portion of the split elastic member 64 is pushed open by the inclined surface of the top 68 and comes into pressure contact with the wrapped portion of the blanket 4, completing installation of the gap bridge. In this state, the split end portion of the split elastic member 64 comes into pressure contact with the portion within the groove of the blanket 4, and does not fall off. In addition, to remove the gap bridge, reverse the hexagon socket head bolt 66,
After returning to the state shown in FIG. 6(b) again, a screwdriver or the like may be applied to the end face of the split end member 64 to slide it 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 2 is removed due to the gap bridge 64.
From 0a, it is possible to completely prevent the mixture of cleaning liquid 1, paper powder, ink, etc., from entering the groove 20.

Therefore, after cleaning the blanket 4, there is no need to wipe off the mixture 24 that has entered the gap 20a.

Therefore, the mixture 24 of the cleaning liquid 2, paper powder, ink, etc. that comes out of the gap 20a does not adhere to the surface of the printed paper, and there is no problem that the quality of the printed matter deteriorates.

Note that in this embodiment, the gap between the tip cracks shown in FIG. 6(c) is wider than the slit 50a etc. of other embodiments, but it may be formed to have the same width as the slit 50a etc. Of course it's a good thing.

〔Effect of the invention〕

According to the present invention, in the gap created between the groove upper ends of both ends of the blanket caught in the groove of the blanket cylinder,
Cleaning Liquid 2 The blanket cylinder of the offset rotary press is equipped with a gap bridge that fundamentally prevents mixtures such as paper powder and ink from entering, so after cleaning the blanket cylinder, the mixture that has entered the gap can be wiped off as in the conventional method. There is no need and no problem of poor print quality arises due to this mixture.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) are side sectional views showing the main parts of the first embodiment of the blanket cylinder of the offset rotary press according to the present invention, and the gap bridge and its fixing fittings are attached to the blanket cylinder. Developed view, side view, Figure 2 Ca),
(b) and (c) are a side sectional view showing the main parts of the second embodiment of the blanket cylinder for an offset rotary press according to the present invention, a developed view and a side view of the blanket forming a gap bridge, and Fig. 3 (a). ), (b), and (c) are a side sectional view showing a main part of a third embodiment of a blanket cylinder for an offset rotary press according to the present invention, a front view of the blanket cylinder equipped with a gap bridge, and a front view of the gap bridge. , Figure 4(a)
, (b), and (c) are a side sectional view of a blanket cylinder showing a modification of the embodiment in FIG. 3, a front view of the blanket cylinder equipped with a gap bridge, a front view of the gap bridge, and FIG. 5(a). , (b) and (c) are a side sectional view showing the main part of the fourth embodiment of the blanket cylinder of the offset rotary press according to the present invention, a diagram showing the detailed structure of the gap bridge, and a front view of the entire gap bridge, Figure 6 (a), (b), (
c) is a side sectional view showing the main part of the fifth embodiment of the blanket cylinder of the offset rotary press according to the present invention, a diagram showing the detailed structure of the gap bridge, and a front view of the entire gap bridge; FIG. 8 is a side view showing the relationship between a conventional blanket cylinder and the blanket cylinder cleaning device shown in FIG. 7, and FIG. 9 is a diagram showing the operating state of the device shown in FIG. 8. be. 2... Blanket body, 4... Blanket, 6.
...Side plate, 8...Fabric supply roll, 1o...
- Cloth winding roll, 12... Cleaning cloth, 14... Stay 16... Pressure pad, 18... Pressure chamber, 2o... Groove, 20a... Gap, 22a, 22
b... Blanket winding shaft, 24... Cleaning liquid 9 mixture of paper powder, ink, etc., 30... Gap bridge (
(inverted-shaped member), 32...Fixing bracket, 34...Screw. 40... Gap bridge (tongue piece), 50... Gap bridge (elastic member), 50a... Slit, 52... Gap bridge (elastic member), 60...
Gap bridge (split elastic member), 62... Hexagon socket head bolt, 64... Gap bridge (split elastic member), 66
...hexagon socket head bolt, 68...piece, 70...stopper. Figure 2 (a) (b) Figure 4 (b) (C) Figure (b) (C) Same as Figure 2

Claims (1)

[Scope of Claims] 1. In a blanket cylinder of an offset rotary press, in which grooves are formed parallel to the rotation axis on the outer circumferential surface to wrap and fix both ends of a sheet-like blanket wound, the blanket rolled up at the upper end of the groove. 1. A blanket cylinder for an offset rotary press, comprising a gap bridge that closes a gap formed between the cylinders at substantially the same height as the outer circumferential surface. 2. The blanket cylinder for an offset rotary press according to claim 1, wherein the gap bridge includes an inverted L-shaped member having one side held at substantially the same height as the outer circumferential surface of the blanket, and the inverted L-shaped member. A blanket cylinder for an offset rotary press, comprising a metal fitting for fixing to the blanket. 3. The blanket cylinder for an offset rotary press according to claim 1, wherein the gap bridge is formed integrally with the blanket and extends from the upstream side in the rotational direction to the width of the gap at approximately the same height as the outer peripheral surface of the blanket. A blanket cylinder for an offset rotary press, characterized in that it consists of blades that extend. 4. The blanket cylinder for an offset rotary press according to claim 1, wherein the gap bridge is widened when installed in the groove and the head held at approximately the same height as the outer peripheral surface of the blanket. A blanket cylinder for an offset rotary press comprising an elastic member having a skirt that is in pressure contact with the rolled-up blanket. 5. The blanket cylinder for an offset rotary press according to claim 1, wherein the gap bridge has a head that is held at approximately the same height as the blanket, and the gap bridge has a head that is held at approximately the same height as the blanket, and the rotation axis is located at a plurality of locations in the direction of the rotation axis of the blanket. An offset characterized by comprising a split elastic member having a threaded hole tapered toward the end, and a bolt that is screwed into the threaded hole of the elastic member to widen the split part and press against the wrapped blanket. Blanket cylinder of rotary press. 6. The blanket cylinder for an offset rotary press according to claim 1, wherein the gap bridge has a head that is held at approximately the same height as the blanket, and the gap bridge has a head that is held at approximately the same height as the blanket, and the rotation axis is located at a plurality of locations in the direction of the rotation axis of the blanket. a tip-split elastic member with a hole formed toward the tip; a top with a trapezoidal cross section having a screw hole inside and inserted into the tip-split portion of the elastic member from the tip side; and a screw hole of the top from the outer peripheral surface side. 1. A blanket cylinder for an offset rotary press, comprising: a bolt that is screwed into the frame to widen the split end portion of the elastic member and bring it into pressure contact with the rolled-up blanket.