JPH0528634U - Powder spray device for sheet-fed printing press - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a powder spray nozzle in which a spray nozzle that performs a dusting action can be set according to the paper width. In a powder spray device provided in a paper discharge section of a sheet-fed printing press, a plurality of spray nozzles are respectively provided with electromagnetic opening / closing valves, and further, a control device for controlling opening / closing of the opening / closing valves and a paper width size are set. Powder spray device equipped with a paper size input device for inputting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a spray nozzle switching device in a powder spray device provided in a sheet discharge section of a sheet-fed machine.

[0002]

[Prior Art]

 FIG. 6 is a side view showing the outline of the sheet discharge section of the sheet-fed printing press, and shows the relationship between the sprocket 3 of the shaft end 2a of the sheet discharge cylinder 2 that is in contact with the impression cylinder 1 and the sprocket 5 of the sheet discharge shaft 4. A pair of left and right chains 6 are stretched to form a closed passage. A plurality of sets (4 sets in this figure) of chain grippers 7 are supported on the chain 6 at regular intervals. On each chain gripper 7, a plurality of sets of gripper claws 8 (hereinafter referred to as claws) are juxtaposed in the axial direction (paper width direction) of the chain gripper 7.

Next, in the offset sheet-fed machine including the paper feeding unit 23, the printing unit 24, and the paper ejection unit 25, the printed paper is transferred from the claw 1 a of the impression cylinder 1 of the printing unit 24 to the paper ejection cylinder. By the cooperation of 2, the jaws 7 of the chain gripper 7 bite the teeth, and they are transported by the running of the chain 6. In the traveling path of the chain 6, below the terminal end of the path for conveying paper, a paper stacking platform 9 is supported at four corners and is hung and suspended by an elevating chain 10, and the paper released from the bite of the claw 8 is released. Are dropped and stacked on the paper stack 9. If the printing surface of the paper stacked on the paper stack 9 is not sufficiently dried, set-off occurs and the quality of the printed matter deteriorates. Therefore, a method has been conventionally used in which a powder spray device 11 is provided in a space inside a closed passage of the chain 6 (a slanted portion of the chain 6) to disperse powder on a printing surface of paper to prevent set-off.

As shown in FIGS. 3 and 4, the powder spray device 11 is provided mainly at an air conditioner press 12 for supplying compressed air, a container 13 for storing powder, and a shaft end of the discharge cylinder 2. It is composed of a cam 14. Further, a valve 16 for opening and closing a passage from the air conditioner press 12 to the inlet of the container 13 is provided, and at the outlet of the container 13, a nozzle pipe 15 connected via a hose, and attached to this pipe 15. A large number of spray nozzles 17 are provided. Here, the compressed air from the air conditioner press 12 blows out the powder in the container 13 from the spray nozzle 17 through the nozzle pipe 15 when the valve 16 is opened by the cam 14. On the contrary, when the valve 16 is closed, the blowing of powder from the spray nozzle 17 is stopped.

[0005]

[Problems to be solved by the device]

 The above-mentioned conventional technique has the following problems. The width of the paper used in sheet-fed machines is not constant. Therefore, it is necessary to increase or decrease the number of spray nozzles that perform dusting action according to the paper width, but in general, there is no cock installed between the nozzle pipe and each spray nozzle to connect and block the compressed air passage. .. In addition, a plurality of spray nozzles are arranged in the paper width direction according to the paper width between the maximum and the minimum, but they cannot move. Therefore, even if dusting is performed, the effect of preventing set-off is not enhanced. Depending on the paper width, spray nozzles that perform wasteful dusting may be generated. The dust that is sprayed here innocently scatters not only on the members of the paper ejection section but also around it, and contaminates these materials and deteriorates the surrounding environment.

If the above-mentioned cock is provided between the nozzle pipe and each spray nozzle and the spray is to be shut off according to the paper width, it is necessary to stop the machine and operate the cock under the discharge section. .. Moreover, the work is not easy because the space is small. Of course, the operation while driving is impossible. For this reason, spray nozzles are often used without interruption.

[0007]

[Means for Solving the Problems]

 In the conventional device, there is a spray nozzle that is not effective even if it is sprinkled on the paper depending on the width of the paper.Therefore, a device that remotely stops the dusting action and switches the number of spray nozzles that should perform the dusting action is provided. .. It should be noted that a spray nozzle that performs a dusting action may be preset.

An object of the present invention is to provide a powder spray nozzle that can set a spray nozzle that performs a dusting action according to the paper width.

[0009]

[Action]

 Do not perform effective dusting for the paper width Stop the dusting of the spray nozzle.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIG. As shown in the figure, the powder spray device according to the present invention comprises a nozzle pipe 15, a plurality of spray nozzles 17, an air passage 28, and a powder-operated solenoid valve 22 for remote operation. The number of nozzles used according to the paper width is input in advance in a storage device (not shown). Here, when the size of the paper to be printed is input to the paper size input device (not shown), it is output to the electromagnetic valve 28 provided in each spray nozzle 17, and the valve 28 opens and closes.

Therefore, depending on the paper width, the air passages 28a and 28b are connected or blocked to set whether or not the dusting action of the nozzle is performed.

[0012]

[Effect of the device]

 The present invention relates to a powder spray device provided in a paper discharge section of a sheet-fed printing press, in which a plurality of spray nozzles are respectively provided with electromagnetic opening / closing valves, and further, a control device for controlling opening / closing of the opening / closing valves and a paper width. By providing the paper size input device for inputting the size, the following effects are obtained. (1) Powder and compressed air are saved, and the deterioration of the surrounding environment can be minimized. (2) The spray nozzle switching operation is safe and easy, and presetting is possible. (3) The switching work time is shortened and the operating rate of the printing press is improved.

[Brief description of drawings]

FIG. 1 is a front view showing a switching device portion of an embodiment of the present invention.

FIG. 2 is a schematic view of the entire powder spray device.

FIG. 3 is a front view of a powder supply portion of the powder spray device.

FIG. 4 is a side view of FIG.

FIG. 5 is a front view of a conventional spray nozzle portion of the powder spray device.

FIG. 6 is a side view of the offset sheet-fed printing press.

[Explanation of symbols]

 15 Nozzle pipe 17 Spray nozzle 21 Switching device 22 Solenoid valve

Claims (1)

[Scope of utility model registration request] 1. A powder spray device provided in a paper discharge section of a sheet-fed printing press, wherein a plurality of spray nozzles are respectively provided with electromagnetic opening / closing valves, and a control device for controlling opening / closing of the opening / closing valves, and a paper A powder spray device for a sheet-fed printing press, which is provided with a paper size input device for inputting a width size.