JPH055447U - Turn bar device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent dirt that has been generated by rubbing the web by the upstream cylindrical surface and the downstream cylindrical surface of the turn bar. [Structure] The pressure air supplied from the pressure air supply port 1i to the inside 1b of the turn bar 1 is provided with a large number of holes 1a of the turn bar 1.
From the pressure air supply port 2
The pressurized air supplied from i into the turnbar air chamber 2 is jetted downward and upward from the numerous holes 3 and 4 of the air chamber 2,
The web a is floated by the air-chamber guide surface 2d on the winding start side, the cylindrical surface 1c of the turn bar 1 and the air-chamber guide surface 2e on the winding end side so that the printed surface of the running web a is not contaminated. ..

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a turn bar device for a rotary printing press.

[0002]

[Prior Art]

 A conventional turn bar device for a rotary printing press will be described with reference to FIG. 2. Reference numeral 1 is a hollow turn bar that changes the traveling direction of the web a. This turn bar 1 is usually composed of a cylindrical tube and is arranged in the traveling direction of the web a. On the other hand, it is installed at an angle of 45 ° to the left or right and does not rotate.

Therefore, a large number of holes 1a are provided in the cylindrical surface 1c on the side where the web a is wound, and the pressurized air supplied to the inside 1b of the turn bar 1 is ejected radially outward from the large number of holes 1a, The web a is lifted from the cylindrical surface 1c so that the printed surface of the web a is not soiled. In the cylindrical surface 1c of the turn bar 1, the side where the web a enters and starts winding is the upstream side, and the winding end side is the downstream side.

[0004]

[Problems to be solved by the device]

 In the conventional turn bar device of the rotary printing press shown in FIG. 2, the pressure air jetted radially outward from the hole 1a of the upstream side cylindrical surface 1c of the turn bar 1 and the hole 1a of the downstream side cylindrical surface 1c has a space S. Side (the web a is not wrapped around and the space S side with less resistance) easily escapes, and it is difficult for an air layer to be formed on the upstream side cylindrical surface 1c and the downstream side cylindrical surface 1c. There was a problem that it was rubbed by the cylindrical surface 1c of No. 1 and became dirty.

The present invention has been proposed in view of the above problems, and its purpose is to eliminate the dirt generated when the web is rubbed by the upstream cylindrical surface and the downstream cylindrical surface of the turn bar. The point is to provide a turnbar device that can be prevented.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in the turn bar device of the present invention, a turn bar air chamber for blowing pressurized air to the web is provided near the web winding start side and the web winding end side of the turn bar.

[0007]

[Action]

 The turn bar device of the present invention is constructed as described above, and the pressure air supplied to the inside of the turn bar is ejected radially outward from the many holes, while the pressure air supplied to the turn bar air chamber is made to the many holes. From above and below, the web is lifted up by the air chamber guide surface on the winding start side, the turn bar cylindrical surface, and the pressure chamber guide surface on the winding end side so that the printing surface of the running web is not contaminated. To do.

[0008]

【Example】

 Next, the turn bar device of the present invention will be described with reference to an embodiment shown in FIG. 1. 1 is a cylindrical turn bar, and 1a is a large number of holes provided from the upstream cylindrical surface 1c of the turn bar 1 to the downstream cylindrical surface 1c. , 1b is the inside of the turn bar 1, and 1i is a pressure air supply port provided at the end of the turn bar 1.

2 is a turn bar air chamber installed on the space S side of the turn bar 1, 2 d is an upstream guide surface of the air chamber 2, 2 e is a downstream guide surface of the air chamber 2, and an upstream guide surface 2 d Is connected to the upstream cylindrical surface 1c of the turn bar 1, and the downstream guide surface 2e is connected to the downstream cylindrical surface 1c of the turn bar 1. 2i is a pressure air supply port provided at the end of the turn bar air chamber 2, 4 is a large number of holes provided in the upstream guide surface 2d of the air chamber 2, and 3 is provided in the downstream guide surface 2e of the air chamber 2. Many holes.

The turn bar 1 and the turn bar air chamber 2 may be of a separate type as shown in (b) or may be an integrated type as shown in (c). The pressure air supply system directed to the pressure air supply port 1i and the pressure air supply system directed to the pressure air supply port 2i are provided with a pressure adjusting valve and a flow rate adjusting valve. The upstream guide surface 2d and the downstream guide surface 2e of the air chamber 2 do not have to be parallel to the traveling path of the web a. Further, the air chamber 2 may be divided into an upstream side and a downstream side.

Next, the operation of the turn bar device shown in FIG. 1 will be specifically described. Pressure air supplied from the pressure air supply port 1i to the inside 1b of the turnbar 1 is ejected radially outward from the many holes 1a of the turnbar 1 while pressure supplied from the pressure air supply port 2i into the turnbar air chamber 2 Air is ejected downwards and upwards from a large number of holes 3 and 4 in the air chamber 2, and the web a is guided to the air chamber guide surface 2d on the winding start side, the turn bar cylindrical surface 1c, and the air chamber guide surface 2e on the winding end side. So that the printed surface of the running web a does not get dirty.

At that time, an air layer is formed between the guide surface 2d, the cylindrical surface 1c, the guide surface 2e, and the web a traveling along these surfaces, and the air layer has an appropriate tension on the web a. And don't let the web a flap.

[0013]

[Effect of the device]

 As described above, the turn bar device of the present invention ejects the pressure air supplied to the inside of the turn bar radially outward from a large number of holes, while the pressure air supplied to the turn bar air chamber is downward and upward from a large number of holes. The web is ejected to the air chamber guide surface on the winding start side, the cylindrical surface of the turn bar, and the pressure chamber guide surface on the winding end side so as to prevent the printed surface of the running web from being contaminated. This has the effect of preventing dirt from being rubbed by the upstream and downstream cylindrical surfaces of the turn bar.

[Brief description of drawings]

1A is a perspective view showing an embodiment of a turn bar device of the present invention, FIG. 1B is a vertical sectional side view showing the integrated turn bar device, and FIG. 1C is a separation type turn bar device. It is a vertical side view.

FIG. 2A is a plan view showing a conventional turn bar device,
(B) is the side view.

[Explanation of symbols]

 1 Turn bar 2 Air chamber for turn bar a Web

Claims (1)

Claims for utility model registration: 1. A turnbar device characterized in that a turnbar air chamber for blowing pressurized air to the web is arranged near the web winding start side and the web winding end side of the turn bar.