JPH0530037Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to automatic width determination of a paper feeding arm in a paper feeding device of a rotary printing press.

[Prior Art] A paper feeding device of a rotary printing press has the role of holding a roll-shaped web 1 and supplying the web to the printing machine, as shown in the schematic diagram of the rotary printing press in Fig. 3. In order to supply the paper to the printing press by supporting the arm A with the original fabric fixed by an actuator a such as an air cylinder, and to apply a constant tension to the paper,
The structure is such that the brake is applied to the part that holds the raw material in place.

In general, in continuous form printing, the type of web, paper width, and roll diameter vary depending on the type of form and production quantity.As the form market is becoming more diverse and small-lot, the number of times the web is replaced is also increased. It's summery.

There are two main ways to exchange the original fabric:

Shaft type In this type, as shown in Fig. 4, a shaft 5 equipped with a drive transmission system such as a coupling or gears is passed through one side of the raw material 1 in advance, and the raw material is moved using a claw (not shown) or the like contained within the shaft. Fix the opposite. To set the web on the printing press, roll the web onto which the shaft 5 is fixed onto the paper feed arm 2, raise the arm 2 using an air cylinder 4, etc., lift the web 1, and roll it on the arm. A method is used in which the drive transmission system of the shaft is connected to the drive transmission system connected to the paper feed brake 6 of the printing press.

However, with this method, it is necessary to replace the heavy shaft every time the web is replaced, and the shaft 5 and the web 1 must be moved on the arm in order to set it in a predetermined position, which increases the burden on the worker. There was an inconvenience.

Shaftless type As shown in Figure 5, this type does not pass the shaft through the web 1, but moves the width of the arm 8 by input or drive system in advance to a position slightly wider than the paper width, and rolls the web during this time. , Move the arm 8 up and down so that the center of the original fabric matches the center of the original fabric fixing taper cone 7 that bites the fabric, and use the input or drive system to make the fabric fixing taper cone 7 bite the fabric. After fixing, the arm 8 is raised and set. In this type, the feed brake 9 is connected to the cone 7, so there is no work such as meshing gears, and of course there is no shaft for passing the material through, so there is no need to replace it, which reduces the burden on the operator. Since there is a limit to the stroke when the cone 7 bites the original fabric, a certain degree of accuracy is required in determining the width of the arm.

Conventionally, a method has been adopted to solve this problem, such as providing a scale or the like on the shaft 10 that supports the arm 8, but since the width is determined by input, there is variation, and the cone 7 bites the original fabric. The arm cannot be fully retracted, causing operational losses such as having to re-determine the arm width.

[Objective] In view of the above points, it is an object of the present invention to provide a shaftless type paper feeding device that automates the width determination of the arm for the original fabric/paper width.

[Configuration] The shaftless type paper feeding device of the present invention has both one paper feeding arm that holds a roll of material,
Alternatively, move one of the paper feed arms to change the distance between the paper feed arms, and also detect the distance between the paper feed arm and the original and stop the paper feed arm from moving when the distance reaches a certain distance. It is configured as follows.

[Embodiments] The present invention relates to a shaftless type paper feeding device, and examples of the present invention will be described below with reference to the drawings.

1 and 2 are plan views of a paper feeding device according to the present invention.

A pair of paper feed arms 11, 11' are supported facing the paper feed arm shaft 12, one paper feed arm 11 is fixed, and the other arm 11' is slidable on the paper feed arm shaft 12. It is becoming. A screw shaft 16 rotatable by a hydraulic motor 14 is rotatably installed below the paper feed arm shaft 12, and one end of the screw shaft 16 is screwed into a screw hole of the paper feed arm 11'. The paper feed arm shaft 12 is driven up and down by a hydraulic cylinder 15.

A tapered cone 13 is provided on the inside of the lower end of the paper feed arms 11, 11' to face each other, and this tapered cone 13 is driven by a hydraulic motor 18 to move in the direction of the arrow as shown in FIG. Taper cone 13 inside paper feed arm 11'
A sensor 17 is attached to the upper part, and detects the distance to the web 10 using irradiated light and its reflected light, and controls the hydraulic motor 14.

All of these driving sources are connected to a switch, and are operated by operating a switch button (not shown).

The operation of the paper feeding device with the above configuration will be explained.

First, the paper feed arm 1 is
1 and 11' are moved up and down to bring the center of the raw fabric 10 and the taper cone 13 to the same position.

By driving the hydraulic motor 14, the screw shaft 1
6, and arm 11' according to this direction of rotation.
moves left and right along the screw shaft 16. Original fabric 1
The distance between the 0 side surface and the arm 11' is the hydraulic motor 18.
When a certain distance at which the original fabric 10 can be held and fixed within the original fabric gripping stroke range of the original fabric fixing taper cone 13 is reached, the sensor 17 is activated, and this signal causes the drive of the arm to stop. Then, the taper cone 13 is finely adjusted by the hydraulic motor 18, and the raw fabric 10 is bitten and fixed by the taper cone 13.

In the present invention, a hydraulic cylinder and a hydraulic motor are used as the drive system, but it may be pneumatic or electric as long as it performs the same function, and any sensor that can detect the interval may be used.

[Effects of the invention] According to the paper feeding device of the present invention, no matter what paper width the original paper 10 is used, the gap between the arm 11' and the original paper is always a constant distance, so when replacing the original paper, it is difficult to The arm width can be determined simply by pressing a button, and errors in determining the arm width, such as not being able to bite the original fabric with just the adjustment stroke of the taper cone 13, can be completely eliminated.

[Brief explanation of drawings]

Fig. 1 is a plan view of a paper feeding device in an embodiment of the present invention, Fig. 2 is a plan view of a paper feeding device in an embodiment of the present invention with the arm moved, and Fig. 3 is an outline of the paper feeding device. 4 is a schematic diagram of a conventional shaft type paper feeding device, and FIG. 5 is a schematic diagram of a conventional shaftless type paper feeding device. 10...Original fabric, 11,11'...Paper feed arm,
13... Taper cone, 14, 18... Hydraulic motor, 15... Hydraulic cylinder, 16... Screw shaft, 17... Sensor.

Claims (1)

[Scope of utility model registration request] In a paper feeding device that supplies a roll-shaped original fabric by holding it with two tapered cones provided on the paper feeding arm, a drive means for moving the paper feeding arm that supports the original fabric toward the original fabric side. and a drive means for causing at least one of the tapered cones provided on the paper feeding arm to perform a web holding stroke;
The distance between the side surface of the material and the movable paper feed arm is detected, and when the detected distance reaches a value that allows the material to be held by the material holding stroke of the material fixing taper cone, the paper is fed. A paper feeding device comprising: a sensor provided on the paper feeding arm to issue a signal to stop driving the arm.