JPH1095102A - Printing cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a printing cylinder, which has such a form that a sleevelike outer cylinder is attached and detached to/from the outer peripheral face of a standard roll, easily detachably at a low cost and also to provide the printing cylinder which has wide breadth and high quality. SOLUTION: The printing cylinder has such a form that a sleevelike outer cylinder is attached and detached to/from the outer peripheral surface of a standard roll 1. A plurality of sets of air holes 2a-2c for extending the outer cylinder are radiately bored on the outer peripheral face of the standard foil 1 and arranged while holding intervals in the axial direction of the standard roll 1. Supply and stop of air are independently performed for the air hole groups of the respective sets. Thereby, a plurality of pieces of sleevelike outer cylinders 8a, 8b are extended and easily attached and detached to/from the standard roll 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing cylinder of the type in which a sleeve-shaped outer cylinder such as a sleeve-shaped blanket is fitted to the outer peripheral surface of a base roll of a blanket cylinder of an offset rotary press.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are explanatory views of the structure of a conventional printing cylinder in which a blanket or the like is mounted on the outer peripheral surface of a base roll. FIG. 8 shows a type in which a sheet blanket is wound.
FIG. 9 illustrates a printing cylinder of the type in which a sleeve blanket is fitted.

In the printing press, the ink supplied to the ink reservoir is sequentially transferred by an ink roller group. In the process, the ink is appropriately kneaded to form a thin ink film, and then transferred to a printing plate 15 wound around a plate cylinder 14. Further, after transferring to a blanket cylinder on which an elastic body (blanket) 16 mainly composed of rubber is wound on the outer peripheral surface, printing is performed on the surface of the web 18 which is in contact with the blanket cylinder and runs. Two-sided printing can be performed by setting the cylinder above and below the sheet path line.

Incidentally, the printing plate 15 and the blanket 16 need to be replaced every predetermined number of sheets, so that the printing plate 15 or the blanket 16 is attached to the outer peripheral surfaces of the rolls 14 and 1 to be wound as shown in FIG. The slit-like groove 17 was formed over the entire area in the axial direction so that the front and rear ends of the 16 were inserted and gripped (fixed) via claws.

However, today, as shown in FIG. 9, in a commercial offset rotary press, a printing press using a sleeve-shaped outer cylinder (blanket) 8 as a blanket cylinder has been put into practical use. The length has been greatly reduced, and waste paper can be reduced (saving paper costs).

The blanket cylinder is configured so that an outer cylinder (blanket) 8 formed in a sleeve shape can be fitted to and removed from the outer peripheral surface of the base roll 1. The fitting operation is performed by extracting both the bearing portion and the blanket on one side in the axial direction. This is performed after moving to another position to form a predetermined space.

The air hole 2 formed at the end of the base roll 1 blows out compressed air from the outside to the outside in the radial direction through a hole at the center of the shaft, and the air between the base roll 1 and the sleeve-like outer cylinder (blanket) 8 is formed. It is an auxiliary means for forming a compressed air layer in the gap and expanding the inner diameter of the blanket 8 to facilitate insertion and removal.

The inner diameter of the sleeve-like blanket 8 is usually slightly smaller than the outer diameter of the main shaft roll 1. During operation, the supply of air is stopped, and the blanket 8 is contracted to shift the inner surface of the main shaft roll 1. It is attached so that there is no. This eliminates the need for the slit-like groove 17 for attaching a blanket, which is conventionally formed on the outer peripheral surface of the base roll 1.

The improvement of the blanket cylinder, together with the improvement of the slit-like groove 17 of the plate cylinder 14, that is, the reduction of the width of the gap, reduces the change in printing pressure and various shocks caused by the shock due to the engagement of the gap. effective. The shock mainly has a movement (vibration) in the radial direction of the printing cylinder and a variation in angular velocity (rotation unevenness) in the rotation direction, and causes doubles, slurs, shocks, and eyes.
This causes various printing troubles such as unevenness of ink density on the printing surface, color misregistration, and band-shaped printing unevenness that occurs periodically.

However, the above-mentioned various improvements have greatly reduced the shock caused by the rotation of the printing cylinder, so that high-quality printing and high-speed operation have become possible. In this way, the technical progress has been dramatic. However, there is a need for customers to expand the width of machines and to further reduce waste paper and improve production efficiency.

For example, instead of printing 16 pages on the front and back of the web 18 conventionally, the number of pages is increased to 24 pages on both sides. (1) Both width end portions of the web 18 (broken paper) (2) consolidate bookbinding lines by multi-page signatures, (3) further improve productivity, etc. Things.

Further, application to a newspaper rotary press is also considered. Due to these requirements, it is necessary to increase the total length of the printing cylinder, and at the same time, it is necessary to increase the total length of the sleeve-shaped outer cylinder (blanket) 8 to be fitted in accordance with the printing cylinder. For this reason, various problems described later have occurred.

[0013]

As described in the section of the prior art, since the sheet-like blanket is wound on the outer peripheral surface of the main shaft roll, the printing pressure fluctuation and various shocks generated by the shock due to the engagement of the gap are increased. Noise associated with
In recent years, a printing cylinder of a type in which a sleeve-like blanket is fitted to a main shaft roll in order to reduce vibration has become popular. As a result, the length of the non-printed portion in the web running direction can be reduced, and high-speed printing can be performed.

However, as a customer's need, the width of the machine is increased to increase the number of pages that can be printed in one rotation of the plate cylinder, and accordingly, the area ratio of the non-printed portion (broken paper) that can be formed at both ends of the web and the productivity are reduced. There is a demand to improve the quality. As a means for addressing this demand, it is necessary to increase the length of the printing cylinder in the axial direction. In connection with this, the following problems have arisen from the necessity of increasing the length of the sleeve blanket.

(1) In order to produce a uniform thickness over the entire width and circumferential length of the sleeve-like blanket, more advanced technology is required.

(2) Increasing the axial length of the sleeve-like blanket dramatically increases the production cost in relation to the item (1).

(3) Operability when the sleeve is fitted to and removed from the main shaft roll is reduced, and it takes time to replace and replace the sleeve.

(4) Workability is deteriorated over the entire maintenance management such as movement, storage and cleaning of the sleeve.

(5) It is necessary to replace the entire sleeve due to partial wear or damage of the sleeve, which increases the running cost.

The present invention makes it possible to manufacture a printing cylinder of a type in which a sleeve-shaped outer cylinder is fitted to and detached from the outer peripheral surface of a base roll at low cost and easily, and to provide a high-quality printing cylinder having a wide width. It is an object of the present invention to provide a printing cylinder that has been developed.

[0021]

SUMMARY OF THE INVENTION The present invention is directed to a printing cylinder of the type in which a sleeve-shaped outer cylinder is fitted on the outer peripheral surface of a base roll such as a blanket cylinder. Plural sets of perforated outer cylinder expansion air holes are arranged at intervals in the axial direction of the same base roll, and air supply / stop is performed independently for each set of air holes, whereby the base roll is provided. The present invention provides a printing cylinder having a plurality of sleeve-shaped outer cylinders configured to be fitted thereinto and detached therefrom.

According to the printing cylinder configured as described above, a plurality of sleeve-shaped outer cylinders are smoothly fitted on the outer peripheral surface of the base roll by sequentially supplying air to the outer cylinder expanding air holes. A printing cylinder having a large axial length is provided with good workability.

Since the sleeve-shaped outer cylinder is divided into a plurality of pieces in the axial direction, the length per one sleeve-shaped outer cylinder can be shortened. A wide printing cylinder capable of multi-page printing is provided.

In the printing cylinder according to the present invention, the outer cylinder expanding air holes provided on the base roll are provided at positions outside the printing area so that the installation of the outer cylinder expanding air holes does not adversely affect printing. It is preferred that

In the printing cylinder of the present invention, a valve having a configuration in which air is blown out when pushed down by the sleeve-shaped outer cylinder fitted to the main shaft roll is provided in the outer cylinder expanding air hole group, and the sleeve-shaped outer cylinder is provided. When is fitted to and removed from the base roll, the valves are automatically opened by the sleeve-shaped outer cylinder so that air for floating the sleeve-shaped outer cylinder is jetted out. Shutdown can be performed quickly and work efficiency can be increased.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing cylinder according to the present invention will be specifically described below with reference to the embodiments shown in FIGS. 8 and 9 in the following embodiment.
Are denoted by the same reference numerals for the sake of simplicity of description, and duplicate description of those will be omitted.

(First Embodiment) First, a printing cylinder according to a first embodiment of the present invention will be described with reference to FIGS.

(Structure) In the printing cylinder according to the first embodiment, an example is shown in which two sleeve-shaped outer cylinders are fitted on the outer peripheral surface of a base roll. In the illustrated printing cylinder, a plurality of outer cylinder expansion air holes 2 are formed at equal angles on the outer peripheral surface of the base roll 1, and are mutually connected through the groove 4 of the seal member 3 inserted into the hollow portion inside the base roll 1. They are communicating.

That is, the seal member 3 has a groove 4 formed over the entire outer periphery, and the groove 4 and the air supply port 5 provided on the side in the axial direction of the base roll are communicated via the air pipe 6. Let me do it. In the figure, reference numerals 7a and 7b denote O-rings (sealing materials) for preventing air from flowing out from both ends of the groove 4.

The air hole 2 for expanding the sleeve-shaped outer cylinder having the above structure.
In this example, three systems of air holes 2a, 2b, and 2c are independently provided in the axial direction of the base roll 1 in this example. Therefore, the compressed air supplied from the air supply port 5a passes through the air pipe 6a and the groove 4a of the seal member 3a.
Air hole 2 drilled on the outer peripheral surface of the spindle roll 1
Released from a.

The air supplied from the air supply port 5b is released from the air hole 2b, and the air supplied from the air supply port 5c is released from the air hole 2c.

The positions of the air holes 2a, 2b, 2c in the axial direction of the base roll 1 are, as shown in FIG. 4, two sleeves having the same length as the effective shaft length 2L of the base roll 1. When fitting the outer cylinders 8a, 8b, (length L), the first air hole 2a group is set to approximately 5 to 10 m / m from the roll end, and the rear end of the sleeve-shaped outer cylinder 8 is fitted by fitting. The second air holes 2b are positioned so as to be separated from the first air holes 2a, that is, at least about 5 m / m inward from the front end just before passing through the air holes 2a.

In the third air hole 2c group, just before the rear end of the sleeve-shaped outer cylinder 8 fitted into the third air hole 2c passes through the second air hole 2b group, the front end of the sleeve-shaped outer cylinder 8 has a predetermined amount ( (At least 5m / m or more). That is,
When the sleeve-shaped outer cylinder 8 is fitted into the base roll 1 in the axial direction, a part of the front and rear ends of the sleeve-shaped outer cylinder 8 is set so as to be always overlapped with one of the air holes 2 after the initial setting. .

The axial lengths of the plurality of sleeve-shaped outer cylinders 8 in the present apparatus are the same as shown in FIG. It is desirable to set to a position corresponding to the non-image area (non-printing area).

Next, there are various types of air supply / stop switching mechanisms, and FIGS. 2 and 3 are examples of such mechanisms. The example of FIG. 2 is the simplest one, and the air supply pipe connection port connected from the compressor via a pipe is one of the air supply ports 5a, 5b, 5c of the independently provided base roll 1. It works by connecting them sequentially to one place.

The following example shown in FIG. 3 is provided with a three-way rotary valve 10 located at one end face of the base roll 1. The rotary valve 10 is rotatably mounted on the base roll 1 so as to prevent leakage. The air supply pipe 12 connected from the air source via the electromagnetic valve 11 can be connected to each of the air supply ports 5a, 5b, 5c provided at the end of the base roll 1.

(Operation / Effect) The printing cylinder according to the first embodiment has the above-described configuration, and the first sleeve-shaped outer cylinder 8a is fitted from one side of the base roll 1 as an initial setting as shown in FIG. Then, a predetermined amount (5 to 10 m / m 2) of the tip is overlapped with the sleeve-shaped outer cylinder expanding air hole 2 a group. From this state, compressed air is supplied to the air hole 2a group to expand the outer cylinder 8a, whereby the outer peripheral surface of the base roll 1 and the sleeve-shaped outer cylinder 8 are expanded.
The sleeve-shaped outer cylinder 8a is fitted by forming an air space between the outer cylinder 8a and the sliding resistance as in the conventional method.

By this operation, the front end of the outer cylinder 8a passes through the next group of air holes 2b and overlaps by a predetermined amount, and immediately before the rear end of the outer cylinder 8a leaves the group of air holes 2b, that is, the two systems of air holes 2b.
When the front and rear ends of the outer cylinder 8a are overlapped on both sides of the groups a and 2b, air is supplied to the group of air holes 2b, and then the compressed air to the group of air holes 2a is stopped. The outer cylinder 8a is fitted further into the interior by the action of air.

By the above operation, the front end of the outer cylinder 8a passes through the next group of air holes 2c and overlaps by a predetermined amount, and immediately before the rear end of the outer cylinder 8a leaves the group of air holes 2b, Supply air.

Next, the compressed air to the group of air holes 2b is stopped, and the outer cylinder 8a is fitted into the innermost stopper 13 by the action of the compressed air. Air hole 2c in the same state
The supply of compressed air to the group is stopped, and the outer cylinder 8a is fixed by contracting it to its original state.

Subsequently, the next sleeve-shaped outer cylinder 8b is fitted from one side of the base roll 1, and the front end is overlapped with the group of outer cylinder expansion air holes 2a by a predetermined amount (5 to 10 m / m). From this state, compressed air is supplied to the group of air holes 2a, and the outer cylinder 8b is fitted by the action of compressed air in the same manner as described above.

By this operation, the compressed air supply to the air hole groups 2a and 2b is stopped while the front end of the outer cylinder 8b passes through the next air hole group 2b and contacts the rear end of the previously fitted outer cylinder 8a. Then, the outer cylinder 8b is fixed to the same position by contracting to the original state.

Conversely, when extracting the sleeve-shaped outer cylinders 8a and 8b, first, compressed air is supplied to the air holes 2a, then the outer cylinder 8b is extracted, and then the operation reverse to that at the time of insertion is repeated. The compressed air is sequentially switched and supplied to the air hole 2c group, the air hole 2b group, and the air hole 2a group to extract the outer cylinder 8a on the back side to the outside.

Second Embodiment Next, a printing cylinder according to a second embodiment will be described with reference to FIGS.

(Configuration) In the printing cylinder according to the second embodiment, the air holes 2 on the surface of the base roll 1 are arranged in the same manner as in the first embodiment, but the air source is the same. And

The air hole 2 on the surface of the base roll 1 has a valve seat 2
0, and the valve body 19 is pressed against the valve seat 20 by the spring 21;
When there is no object on the surface of the main shaft roll 1, even if air pressure is applied to the air holes 2 '' and 2 ', the structure is stopped at the valve seat portion so as not to be ejected.

When the sleeve-like outer cylinder 8 is inserted into the surface of the base roll 1 and the sleeve-like outer cylinder 8 pushes the projecting portion of the valve body 19 as shown in FIG. Is compressed and lowered downward, and a clearance 2y is formed in a sealing portion with the valve seat 20.
And compressed air is blown out.

Thus, as shown in FIG. 9C, the sleeve-shaped outer cylinder 8 is expanded to facilitate insertion. The air hole 2 ″ is connected to the solenoid valve 1 via the rotary joint 10 ′.
1 and connected to the air source.

In FIGS. 7A and 7B, it is possible to use the force of the supply compressed air itself to push up the valve body 19 instead of the compression spring 21. When not pressurized, the acting force on the insertion outer cylinder 8 can be reduced.

(Operation / Effect) In the printing cylinder according to the second embodiment described above, in addition to the same operation / effect as described in the first embodiment, the compressed air due to the position of the sleeve-shaped outer cylinder 8 is provided. The spout can be spouted automatically when the sleeve-shaped outer cylinder 8 comes over the air hole 2 without the need for a special control device (for example, a valve operation by a sensor and its command). When the mounting of the sleeve-shaped outer cylinder is completed, the solenoid valve 11 is closed by a command. According to this, the connection with the outside of the rotating body may be made at one place, the occurrence of trouble is small, the internal structure of the base roll 1 is simplified, and the manufacture is easy.

In the above embodiment, the sleeve-shaped outer cylinder 8-2
Although the case where the pieces 8a and 8b are fitted and removed has been described, two or more air holes are provided by arranging three or more systems in the axial direction of the base roll 1 in the same manner and sequentially switching the supply of air. The plurality of sleeve-shaped outer cylinders 8a to 8n can be fitted and removed.

The printing cylinder according to the present invention is constructed and functions as described above, and it becomes possible to fit and remove a plurality of sleeve-shaped outer cylinders 8a to 8n divided in the direction of the base roll axis. You can now get the effect.

The length of the sleeve-shaped outer cylinder 8 can be arbitrarily set by omitting the compatibility of the sleeve-shaped outer cylinders 8a to 8n and by limiting (omitting) a part of functions such as specifying an image position. You can do it.

The air supply to the sleeve-shaped outer cylinder expansion air hole 2 and the switching of the stop are switched by an automatic switching type rotary valve or a multi-way switching type solenoid valve. Automatic operation becomes possible by detecting and operating the. Other methods include setting a timer and operating a button by an operator (not shown).

Although the hollow core roll 1 is shown in the present embodiment, it is not necessary to be hollow, and it may be solid and a hole may be provided instead of the pipe 6. The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

[0056]

As described above, in the printing cylinder of the present invention, a plurality of sets of air holes for expanding the sleeve-shaped outer cylinder are arranged at intervals in the axial direction of the base roll. By independently supplying and stopping air to the air hole group, the sleeve-shaped outer cylinder divided into a plurality of pieces in the axial direction of the base roll can be easily fitted to and removed from the outer peripheral surface of the base roll.

As a result, it is possible to reduce the manufacturing cost of the sleeve-shaped outer cylinder such as a blanket, to make a printing cylinder long in the axial direction, and to obtain the following various effects in workability and the like. became.

(1) By fitting the sleeve-shaped outer cylinders in parallel in the axial direction of the base roll, printing with a wide width, that is, multi-page printing is possible, and the productivity can be greatly improved.

(2) Since the axial length per one sleeve-shaped outer cylinder can be shortened, a highly accurate outer cylinder with less variation in wall thickness and the like can be manufactured.

(3) The manufacturing cost per sleeve-shaped outer cylinder can be greatly reduced, and it is cheaper than a long product.

(4) The workability at the time of fitting into and removing from the base roll becomes longer. Further, workability in maintenance such as movement, storage, and cleaning is also improved.

(5) For partial wear or damage, only the part (sleeve-shaped outer cylinder) needs to be replaced and replaced.
Cost savings and running costs can be reduced.

[Brief description of the drawings]

1A and 1B are drawings showing a printing cylinder according to a first embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, FIG. 1B is an end view, and FIG. 1C is an enlarged view of a portion A in FIG.

FIG. 2 shows supply of air to a sleeve-shaped outer cylinder expansion air hole,
Explanatory drawing which shows the example of a stop switching mechanism.

FIG. 3 shows supply of air to a sleeve-shaped outer cylinder expansion air hole,
FIG. 8A is an explanatory view showing another example of the stop switching mechanism, and FIG.
(B) is an end view.

FIG. 4 is an explanatory view showing a positional relationship between a sleeve-shaped outer cylinder and an air hole in an axial direction of a base roll, wherein (a) is a side view,
(B) is an end view.

FIG. 5 is an explanatory view showing an example of supply and stop timing of air to an air hole of a main shaft roll, where (a) is a longitudinal sectional view,
(B) is a cross-sectional view.

6A and 6B are drawings showing a printing cylinder according to a second embodiment of the present invention, wherein FIG. 6A is a side view and FIG. 6B is an end view.

7A and 7B are cross-sectional views illustrating an example of a valve by enlarging a portion B in FIG. 6, and FIG. 7C is an external view of a valve body.

8A and 8B are drawings showing an example of a conventional printing cylinder, in which FIG. 8A is a side view and FIG. 8B is an end view.

9A and 9B are diagrams showing another example of a conventional printing cylinder, in which FIG. 9A is a side view, FIG. 9B is an end view, and FIG. 9C is an enlarged view of a portion R in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft roll 2 Air hole 3 Seal member 4 Groove 5 Air supply port 6 Air piping 7 O-ring (seal material) 8 Sleeve outer cylinder 9 Air supply pipe connection port 10 Rotary valve 11 Solenoid valve 12 Air supply pipe (pipe) 13 Stopper 14 Plate cylinder 15 Printing plate 16 Blanket 17 Slit groove 18 Web (paper to be printed) 19 Valve element 20 Valve seat 21 Spring

Claims (3)

[Claims] 1. A printing cylinder of a type in which a sleeve-shaped outer cylinder is fitted to and removed from an outer peripheral surface of a base roll, wherein a group of air holes for expanding the outer cylinder radially perforated on the outer peripheral surface of the base roll is provided by the same base roll. A plurality of sets are arranged at intervals in the axial direction, and a plurality of sleeve-shaped outer cylinders can be fitted to and removed from the base roll by independently supplying and stopping air to each set of air holes. A printing cylinder, comprising: 2. The printing cylinder according to claim 1, wherein the outer cylinder expanding air hole group is provided at a position outside a printing area. 3. A valve is provided in the outer cylinder expanding air hole group, and the valve has a configuration in which air is ejected when pushed down by a sleeve-shaped outer cylinder fitted to a main shaft roll. Or the printing cylinder according to 2.