JPH04153159A - Stop device for winding paper in paper feeder of rotary printer - Google Patents

Abstract

PURPOSE:To eliminate the breakage of a printing paper by a sudden stop of a paper feeder by providing an air brake on a cone shaft supporting a winding paper, and setting the pressure of the compressed air supplied to the air brake on the basis of the winding diameter and material of the winding paper. CONSTITUTION:The compressed air pressure supplied to an air brake 17 to stop a winding paper 6 is determined from the winding diameter and material of the winding paper 6, and regulated by an electropneumatic converter 22 according to the change of the winding diameter each occasion. When a sudden stop signal is transmitted in a printing unit, a solenoid valve 24 is operated, and the pressure regulated compressed air is supplied to the air brake 17 to stop the rotation of the winding paper 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a web stopping device in a paper feeder of a rotary printing press, and in particular to a web stopping device suitable for suddenly stopping a web being unwound. Relating to a stopping device.

[Prior Art] As shown in FIG. 4, a paper feeder of a rotary printing press consists of a web-instruction section and an infeed section that feeds the printed paper unwound from the web to a printing unit.

In the figure, 1 is a stand, and 2 is a spider shaft, which is rotatably supported by the stand 1. 3 is a spider arm, which is supported by the spider shaft 2 at a predetermined interval. 4 are cone shafts, each of which is rotatably and slidably supported at the end of the spider arm 3. A powder brake 5 is supported by the spider arm 3 and connected to the cone shaft 4 via a transmission means (not shown) so as to apply braking force to the cone shaft 4. Reference numeral 6 denotes a web, which is supported by the cone shaft 4. 7 is printing paper, which is unwound from the roll paper 6.

8 is a frame, and 9 is a guide roller, which is rotatably supported by the frame 8. 10 is an infeet roller,
It is rotatably supported by the frame 8 and rotationally driven by a T-motor (not shown). 11 is a nip roller, and 613 is an encoder that is rotatably supported by the arm 12 that is swingably supported by the frame 8.
It is connected to o.

The printing paper 7 unwound from the web 6 travels along the guide roller 9 and the infeed roller 1o, and is supplied to the printing unit. At this time, the feeding speed of the printing paper 7 is set by the rotational speed of the infeed roller 10,
The tension of the printing paper 7 is set by the braking force of the powder brake 5.

This powder brake 5 is operated based on the diameter of the paper roll supplied to the paper feeder and the average tension of the printing paper 7.
Its capacity has been selected.

On the other hand, due to the diversification of printed materials, the materials of printing paper printed by rotary printing machines, such as paper and synthetic resin films, are diversifying, and the thickness is also diversifying.

[Problem to be solved by the invention] In such a situation, if some kind of trouble occurs during operation of the rotary printing press and each printing unit suddenly stops, the paper feeder also stops suddenly along with the printing unit. It will be necessary to stop it. This sudden stop signal for the printing unit is applied to the powder brake 5 of the paper feeder, causing the powder brake 5 to generate a high braking force to stop the rotation of the web 6.

However, if the moment of inertia of the web 6 is greater than the braking force of the powder brake 5, even if the printing unit stops, the web 6 will not be able to stop completely and the printing paper 7 will be unwound. or infeed roller 10
It sticks to paper and breaks. Further, if the moment of inertia of the web 6 is small and the web 6 stops before the printing unit stops, the tension in the printing paper 7 will increase and the paper will break.

When the printing paper 7 breaks, when printing is restarted,
Paper must be threaded through each printing unit, which greatly reduces work efficiency.

In view of the above-mentioned circumstances, an object of the present invention is to generate a braking force according to the roll diameter and material of the web, and to stop the rotation of the web without breaking the printing paper. The present invention provides a paper web stopping device for a paper machine.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, an air brake is provided on the cone shaft that supports the web.

A winding diameter calculation device that calculates the winding diameter of the winding paper from the difference in rotational speed between the cone shaft and the infeed roller, a mode switching device that selects the material of the winding paper, and a supply to the air brake based on the winding diameter and material of the winding paper. a control device that sets the pressure of the compressed air to be supplied; an electro-pneumatic converter that reduces the pressure of the compressed air supplied from the compressed air source based on commands from the control device; and the electro-pneumatic converter and the air brake. A solenoid valve was installed to open and close the piping between the pipes.

[Operation] Then, the compressed air pressure supplied to the air brake for stopping the paper web is determined from the winding diameter and material of the paper web, and is adjusted by an electro-pneumatic converter according to the change in the winding diameter from time to time.

When a sudden stop signal is generated in the printing unit, a solenoid valve is activated to supply pressure-regulated compressed air to the air brake, thereby stopping the rotation of the web.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3.

In this figure, the same parts as in FIG. 4 are designated by the same reference numerals. 14 is a timing pulley, which is fixed to the powder brake 5. A timing pulley 15 is fixed to the cone shaft 4.

16 is the timing belt, timing pulley 14.1
The stake has been passed on 5th. 17 is an air brake, which is attached to the spider arm 3 and the cone shaft 4. 18 is an encoder connected to one end of the cone shaft 4.

Reference numeral 19 denotes a winding diameter calculating device, which is connected to the encoder 13 and the encoder 18.

Reference numeral 20 denotes a mode switching device, in which a plurality of materials corresponding to the paper roll 6 are set, and the material can be selected using a changeover switch.

A control device 21 is connected to the winding diameter calculation device 19 and the mode switching device.

22 is an electro-pneumatic converter, which is connected to the control device 21 and the compressed air source.

Reference numeral 24 denotes a solenoid valve, which is installed in the pipe line between the electro-pneumatic converter 22 and the air brake 17, and opens and closes the pipe line. The output printing paper 7 is sent to a printing unit via an infeed roller 10. And mode switching equipment! 20, the material of the web 6 supplied to the paper feeder is selected.

Then, the printing unit and paper feeder start operating. Then, the outputs of the encoder 13 and the encoder 18 are applied to the winding diameter calculation device 19.

The winding diameter calculation device 19 calculates the winding diameter of the web 6 based on the output of the encoder 1318, and sends the result to the control device! 2
Apply to 1.

The control device 21 determines the moment of inertia of the web 6 based on the material (A, B, C) of the web 6 designated by the mode switching device 20 and the output of the roll diameter calculating device, and calculates the moment of inertia of the web 6 based on this moment of inertia. , the pressure of the compressed air to be supplied to the air brake 17 is determined, and a voltage corresponding to the determined pressure is applied to the electro-pneumatic converter 22. As shown in FIG. 3, the moment of inertia is proportional to the diameter of the web 6, but its magnitude differs depending on the material (A, B, C) of the web 6.

The electro-pneumatic converter 22 reduces the pressure of compressed air supplied from the compressed air source 23 based on the voltage applied from the control device 21 and sends it to the electromagnetic valve 24 .

When the rotary printing press is operating normally, the web 6
The pressure of the electro-pneumatic converter 22 is simply adjusted in accordance with the decrease in the winding diameter.

When some kind of trouble occurs in a printing unit of a rotary printing press and a sudden stop signal is generated, the rotary printing press is stopped by the sudden stop means.

On the other hand, in the paper feed mn, the solenoid valve 24 is activated by the sudden stop signal, and compressed air is supplied to the air brake 17. Since the pressure of the compressed air at this time is set according to the diameter and material of the web 6, the rotation of the web 6 can be stopped in synchronization with the stop timing of the rotary printing press.

Therefore, it is possible to eliminate paper breaks in the printing paper 7 and to eliminate wasted work time when printing is restarted.

[Effects of the Invention] As described above, according to the present invention, an air brake is provided on the cone shaft that supports the web, and the pressure of compressed air supplied to the air brake is controlled based on the winding diameter and material of the web. Since this setting is made, it is possible to eliminate paper breakage when the paper feeder suddenly stops. Further, work efficiency can be improved by eliminating paper threading work when restarting printing.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a paper web stopping device according to the present invention, Fig. 2 is a plan sectional view showing the mounting position of the air brake, and Fig. 3 is a diagram showing the diameter, material, and moment of inertia of the paper web. FIG. 4 is a characteristic diagram showing the relationship, and is a front view of the paper feeder. 4... Cone shaft, 6... Rolling paper, 10... Infeed roller, 17... Air brake, 19... Winding diameter calculating device, 2
0...Mode switching device, 21...Control device, 22.
...Electro-pneumatic converter, 23... Compressed air source, 24... Solenoid valve Patent applicant Hitachi Seiko Co., Ltd. Representative Patent attorney Kobayashi Homa Akihiro Otsuka Figure 3! is Figure 4

Claims (1)

[Claims] An air brake is provided on a cone shaft that supports the web, and a winding diameter calculation device that calculates the winding diameter of the web from the difference in rotational speed between the cone shaft and the infeed roller of the infeed device, and a mode switch that selects the material of the web. a control device that sets the pressure of compressed air to be supplied to the air brake according to the winding diameter and material of the paper roll; 1. A paper roll stop device for a paper feeder of a rotary printing press, comprising an electro-pneumatic converter that reduces pressure and a solenoid valve that opens and closes a piping path between the electro-pneumatic converter and the air brake.