JPH09109367A - Web cooling roller for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple structure and excellent productivity and to sufficiently reduce the pressure loss. SOLUTION: This web cooling roller for a printer comprises a double cylinder structure of an outer cylinder member 7 for forming the outer surface of the roller and an inner cylinder member 15 concentrically disposed within the member 7, and an annular sectional shape cooling liquid passage 19 formed between the members 7 and 15, wherein the roller is rotatably driven around the central axis of itself. A cooling liquid inlet 23 is formed at the center of the one end face of the roller and a cooling liquid outlet 25 is formed at the center of the other end face of the roller. Impellers 33, 35 are respectively disposed at the inlet chamber 27 extended between the inlet 23 and the passage 19 formed between the one end faces of the members 7, 15 and the passage 19, and the outlet chamber 29 extended between the outlet 25 and the passage 19 formed between the other end faces of the members 7, 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web cooling roller for a printing apparatus, and more particularly to a cooling roller for cooling a high temperature web after drying and drying in an offset rotary printing press.

[0002]

2. Description of the Related Art In an offset rotary printing press, a cooling roller for cooling a high-temperature web after drying is composed of an outer cylinder member forming an outer surface of the roller and an inner cylinder member concentrically arranged in the outer cylinder member. It has a cylindrical structure, has a cooling liquid passage extending in the roller axial direction with an annular cross-sectional shape between the outer cylindrical member and the inner cylindrical member, and is driven to rotate about its own central axis. The web is cooled by contacting the outer surface of the roller with the web.

In this cooling roller, in order to reduce the pressure loss in the cooling liquid passage, which increases due to the rotation of the cooling roller,
As a countermeasure against this, as disclosed in Japanese Patent Publication No. 5-40665, it has already been proposed to provide a spiral plate in the cooling liquid passage to give an axial velocity component to the cooling liquid (cooling water) flowing in the cooling liquid passage. Has been done. This cooling roller is called a double tube spiral plate type cooling roller.

[0004]

The above-mentioned double-tube spiral plate type cooling roller achieves the intended purpose, but has a complicated structure and is mounted with a spiral plate, an inner cylinder member, a central shaft, and the like. ,
If the assembly is troublesome and the number of rotations of the cooling roller is high, the pressure loss may not be sufficiently reduced.

The present invention has been made by paying attention to the above-mentioned problems, has a simple structure, is excellent in manufacturability, can easily perform rust prevention treatment and cleaning of the inside of the roller, and can rotate the roller. An object of the present invention is to provide a web cooling roller for a printing apparatus, which can sufficiently reduce the pressure loss even when the number is high.

[0006]

To achieve the above object, a web cooling roller of a printing apparatus according to claim 1 of the present invention is concentric with an outer cylinder member forming an outer surface of the roller and the outer cylinder member. A double cylinder structure with the arranged inner cylinder member is formed,
A web of a printing apparatus is defined between the outer cylinder member and the inner cylinder member, wherein a cooling liquid passage having an annular cross-sectional shape and extending in the roller axis direction is defined, and is rotationally driven about its own central axis. In the cooling roller, a cooling liquid inlet is formed at the center of one roller end surface portion, and a cooling liquid outlet is formed at the other roller end surface portion, and between the one end surface of the outer cylinder member and the inner cylinder member. And an inlet chamber extending between the cooling liquid inlet and the cooling liquid passage, and the cooling liquid outlet and the cooling formed between the other end surface of the outer cylinder member and the inner cylinder member. An outlet chamber extending between the liquid passage and an impeller is disposed in at least one of the inlet chamber and the outlet chamber.

In the web cooling roller of the printing apparatus according to the present invention, the impeller in the inlet chamber pushes the cooling liquid into the cooling liquid passage from the cooling liquid inlet by the pump action by the rotation of the roller, and the impeller in the outlet chamber acts by the pump action by the cooling liquid. A velocity component for discharging the cooling liquid from the passage to the cooling liquid outlet is given to the cooling liquid. As a result, an axial velocity component is given to the cooling liquid flowing in the cooling liquid passage, pressure loss in the cooling liquid passage is reduced, and the flow rate of the cooling liquid flowing in the cooling liquid passage is secured even when the web cooling roller is rotated at a high speed. .

In order to achieve the above-mentioned object, the web cooling roller of the printing device according to claim 2 of the present invention is the web cooling roller of the printing device according to claim 1, wherein:
Central support shafts are fixed to the end plates at both ends of the outer tubular member,
A cooling liquid supply passage communicating with the cooling liquid inlet is formed on one central support shaft, and a cooling liquid discharge passage communicating with the cooling liquid outlet is formed on the other central support shaft, and the outer cylinder member and the inner cylinder are formed. Inner-outer tube connecting plates that connect the outer tube member and the inner tube member by linearly extending a cooling liquid passage in the axial direction between the members are provided at a plurality of locations around the central axis of the outer tube member. Characterized by being separated from each other.

In the web cooling roller of the printing apparatus according to the present invention, the central supporting shaft is externally attached to the end face plates at both ends of the outer cylindrical member in a stud shaft shape, and is cooled from the cooling liquid supply passage formed in one central supporting shaft. The cooling liquid is supplied to the liquid inlet, and the cooling liquid discharged from the cooling liquid outlet is discharged to the outside through the cooling liquid discharge passage formed in the other central support shaft.

The outer cylinder member and the inner cylinder member are connected to each other by the inner and outer cylinder connecting plates, and the inner cylinder member is supported concentrically by the outer cylinder member by the inner and outer cylinder connecting plates.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of a web cooling roller of a printing apparatus according to the present invention. The web cooling roller is composed of an outer cylindrical member 1 and an outer cylinder member 7 having a hollow structure including outer end face plates 3 and 5 at both ends, and an inner cylindrical member 9 and inner end face plates 11 and 13 at both ends. And an inner cylinder member 15 having a closed structure concentrically arranged in the outer cylinder member 7 and the inner cylinder member 15 to form a double cylinder structure, and the outer cylinder member 1 of the outer cylinder member 7 has a contact surface with a web. It forms a roller outer peripheral surface 17 which is a (cooling surface).

Between the outer cylinder member 7 and the inner cylinder member 15, a cooling liquid passage 19 having an annular cross-sectional shape and extending in the roller axial direction is defined.

A cooling liquid passage 19 linearly extends in the axial direction between the outer cylinder member 7 and the inner cylinder member 15 to connect the outer cylinder member 7 and the inner cylinder member 15 to each other. Are circumferentially spaced from each other at a plurality of locations around the central axis of the outer cylinder member 7, in this embodiment four locations. Inner and outer cylinder connection plate 21
Is welded to the outer tubular member 7 and the inner tubular member 15 to fix and support the inner tubular member 15 concentrically with respect to the outer tubular member 7.

A cooling liquid inlet 23 is formed at the center of one outer end face plate 3, and a cooling liquid outlet 25 is formed at the center of the other outer end face plate 5. A cooling liquid inlet 23 and a cooling liquid passage 19 are provided between the outer end face plate 3 and the inner end face plate 11.
And an outlet chamber 29 extending between the cooling liquid outlet 25 and the cooling liquid passage 19 are defined between the outer end face plate 5 and the inner end face plate 13, respectively. Has been done.

The inlet chamber 27 is provided with a suction impeller 33 composed of a plurality of involute-shaped vane plates 31 attached to the inner end face plate 11, and the outlet chamber 29 is provided with an involute attached to the inner end face plate 13. A discharge impeller 37 having a plurality of shaped vane plates 35 is provided.
The suction impeller 33 rotates integrally with the outer cylinder member 7 and the inner cylinder member 15 to pump the cooling liquid inlet 23.
The cooling liquid is pushed into the cooling liquid passage 19 from the discharge impeller 3
By rotating integrally with the outer cylinder member 7 and the inner cylinder member 15, 7 gives a velocity component for discharging the coolant from the coolant passage 19 to the coolant outlet 25 by the pump action to the coolant.

The blade shapes of the suction impeller 33 and the discharge impeller 37 may be determined by an existing technique such as pump design, and the shape of the blade may be a simple arc shape in order to facilitate manufacture. It is possible by applying technology.

The inner end face plate 11 which faces the cooling water inlet 23
A conical inlet-side cooling liquid guide member 39 is attached to the central portion of the above, and a conical outlet-side cooling liquid guide member 41 is attached to the central portion of the inner end face plate 13 that faces the cooling water outlet 25. .

An end portion of one center support shaft 43 is fitted into a cooling water inlet hole 3a formed in the center portion of the outer end face plate 3 and the center support shaft 43 is externally fixed to the stud shaft type by welding or the like. The end portion of the other central support shaft 45 is fitted into the cooling water outlet hole 5a formed in the central portion of the outer end face plate 5, and the central support shaft 45 is externally fixed by stud shaft type welding or the like. ing. A cooling liquid supply passage 47 is formed in the central support shaft 43 so as to penetrate the central portion thereof in the axial direction and communicate with the cooling liquid inlet 23, and the central support shaft 45 penetrates the central portion thereof in the axial direction. Further, a cooling liquid discharge passage 49 communicating with the cooling liquid outlet 25 is formed.

This web cooling roller has a central support shaft 4
3, 45 are rotatably supported by bearings (not shown) and rotate about their own central axes, and the roller outer peripheral surface 17
Cool the web in contact with.

By this roller rotation, the suction impeller 33 of the inlet chamber 27 pushes the cooling liquid from the cooling liquid inlet 23 into the cooling liquid passage 19 by the pump action, and the discharge impeller 37 of the outlet chamber 29 is pumped by the cooling liquid passage 19. A velocity component for discharging the cooling liquid to the cooling liquid outlet 25 is given to the cooling liquid.

As a result, the cooling liquid supply passage 47 and the cooling liquid inlet 23 enter the inlet chamber 27, flow through the cooling liquid passage 19 to reach the outlet chamber 29, and exit the outlet chamber 29 and the cooling liquid outlet 25 to the cooling liquid discharge passage 49. In a series of cooling liquid flows to the cooling liquid passage 19, an axial velocity component is given to the cooling liquid flowing in the cooling liquid passage 19, pressure loss in the cooling liquid passage 19 is reduced, and even if the web cooling roller rotates at high speed, the cooling liquid passage 19 A flow rate of the cooling liquid flowing through is secured. As a result, the outer peripheral surface 17 of the roller is sufficiently cooled, and the web is satisfactorily cooled.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art that it is possible.

[0024]

As can be understood from the above description, in the web cooling roller of the printing apparatus according to the first aspect, the impeller in the inlet chamber pushes the cooling liquid from the cooling liquid inlet into the cooling liquid passage by the pump action by the rotation of the roller. The impeller in the outlet chamber gives a velocity component for discharging the cooling liquid from the cooling liquid passage to the cooling liquid outlet to the cooling liquid by the pump action, thereby giving an axial flow velocity component to the cooling liquid flowing in the cooling liquid passage, thereby cooling the cooling liquid. The pressure loss in the liquid passage is reduced, and the flow rate of the cooling liquid flowing through the cooling liquid passage is secured even when the web cooling roller is rotated at high speed. Even if the web cooling roller is rotated at high speed, the web cooling roller performs good web cooling. You will be told. Also, this web cooling roller has a simple structure,
It has excellent manufacturability and can easily perform rust prevention treatment and cleaning inside the roller.

In the web cooling roller of the printing apparatus according to the second aspect, the central support shaft is externally attached to the end plates at both ends of the outer tubular member in a stud shaft shape, and the cooling liquid supply passage is formed in one of the central support shafts. The cooling liquid is supplied to the cooling liquid inlet, and the cooling liquid discharged from the cooling liquid outlet is discharged to the outside through the cooling liquid discharge passage formed in the other central support shaft, and also to the outer cylinder member and the inner cylinder member. Are connected to each other by an inner-outer tube connecting plate, and the inner-cylindrical member is supported concentrically by the outer-cylinder member by this inner-outer tube connecting plate. It becomes possible to easily perform rust prevention treatment and cleaning of the inside.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a web cooling roller of a printing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 1 External Cylindrical Member 3, 5 External End Face Plate 7 Outer Cylinder Member 9 Inner Cylindrical Member 11, 13 Inner End Face Plate 15 Inner Cylinder Member 17 Roller Outer Surface 19 Cooling Liquid Passage 21 Inner / External Cylinder Connection Plate 23 Cooling Liquid Inlet 25 Cooling Liquid Outlet 27 Inlet chamber 29 Outlet chamber 31 Blade plate 33 Suction impeller 35 Impeller plate 37 Discharge impeller 39 Inlet side cooling liquid guide member 41 Outlet side cooling liquid guide member 43, 45 Center support shaft 47 Cooling liquid supply passage 49 Cooling liquid discharge passage

Claims (2)

[Claims] 1. A double cylinder structure comprising an outer cylinder member forming an outer surface of a roller and an inner cylinder member concentrically arranged in the outer cylinder member, wherein a double cylinder structure is provided between the outer cylinder member and the inner cylinder member. In a web cooling roller of a printing apparatus, which has a ring-shaped cross-sectional shape and extends in the roller axis direction and extends in the roller axis direction, the web cooling roller of a printing device is driven to rotate about its own center axis. Cooling liquid inlets are respectively formed in the central portions of the other roller end face portions, and are formed between one end faces of the outer cylinder member and the inner cylinder member to form the cooling liquid inlet and the cooling liquid passage. An inlet chamber extending between the outer cylinder member and the inner cylinder member, and an outlet chamber that is formed between the other end surfaces of the outer cylinder member and the inner cylinder member and extends between the cooling liquid outlet and the cooling liquid passage. An impeller is arranged in at least one of the inlet chamber and the outlet chamber. Web cooling roller of a printing apparatus according to claim. 2. A center support shaft is fixed to end plates at both ends of the outer cylinder member, a coolant supply passage communicating with the coolant inlet is formed in one center support shaft, and the other center support shaft is provided with the coolant supply passage. A cooling liquid discharge passage communicating with the cooling liquid outlet is formed,
An inner-outer tube connection plate that connects the outer tube member and the inner tube member by linearly extending a cooling liquid passage in the axial direction between the outer tube member and the inner tube member is the outer tube member. The web cooling roller of the printing apparatus according to claim 1, wherein the web cooling roller is spaced from each other at a plurality of positions around the central axis of the.