JPS5981175A - Contactless jetting-switching mechanism for powder sprayer in printing device - Google Patents

Abstract

PURPOSE:To enable to securely and intermittently blast a powder onto a printing surface of each printing paper even when the paper is discharged from a printing device at a high speed, by a method wherein a circular disk form shutter rotated synchronously with a rotary cylinder is intermediately provided between a blower and a powder sprayer. CONSTITUTION:Air fed from the blower 1 reaches an intake pipe 3 through a pipe 2, is sucked into an intake pipe 4 through opening parts 14-16 provided at a circular disk part 7, flows through a pipe 8 into a powder container 5, where the quantity of air is adjusted, and air is jetted onto the surface of a paper through a nozzle part 6 together with particulates of the powder. When the shutter 17 of the disk part 7 comes to a position between the pipe 3 and the pipe 4, the air flow is shut off, and when the shutter 17 is moved away from the position, air again flows into the pipe 4 through the opening parts 14-16 of the disk part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventionally, in order to prevent ink from backing up on printing paper, powder is injected onto the printing surface of each printing paper at the end of the printing process. The powder spray device is attached to a powder spray device that intermittently sprays the powder using a combination of a light switch, a phototube and a solenoid valve, or a combination of a cam and an air valve, but in recent years, printing speeds have increased to reach 15,000 sheets per hour. With the above-mentioned cam and roller structure, it is difficult to completely transmit a synchronized signal, and since the plunger method uses reciprocating motion, it may cause wear on the sliding parts and incomplete closing of the valve at the opening/closing part, or Electrical failures due to solenoid coil fatigue frequently occur, hindering the effectiveness of powder spraying.

The present invention eliminates the above-mentioned drawbacks and is a device for reliably transmitting air intermittently even at higher speeds.

To explain the configuration of this invention with reference to the drawings, air sent from the blowing crosspiece 1 in FIG. 1 passes through a pipe 2 and a blowing pipe 3.
, and the openings (14, 15, 16
), the powder is blown into the suction pipe 4, passes through the pipe 3, enters the powder container 5, the air volume is adjusted, reaches the nozzle part 6 together with the fine powder, and is sprayed onto the paper surface. When the shutter 17 of the disk part shown in FIG. , air flows into.

Expand or reduce the width of the stacked shutter knobs so that the powder injection time can be increased or decreased depending on the length of the printing paper and the ejection interval of each leaf, and set the female screw 20, long hole 21, and male screw 19 at the optimal position.
The round nut 9, which serves as a frame for fixing, is for attaching and fixing the disc 7 to the mounting shaft 10, and a knurl is cut in the joint surface of both to attach the disc. It has a structure that prevents slippage.

[Brief explanation of the drawings] Fig. 1 is a top view of this device attached to a printing frame; Fig. 2 is a cross-sectional view of the disc portion 7, blowing pipe 3, and suction pipe 4; Fig. 3 is a long-hole type suction The three-dimensional view of the tube in Figure 4 shows the option discs; the one with 14 openings is for a three-piece cylinder, the one with 15 openings is for a two-piece cylinder, and the one with 16 openings is for a one-piece cylinder. It is for use. Code 1 is a blowing crosspiece, 2 is a blowing pipe, 3 is a blowing pipe, 4
5 is a suction pipe, 5 is a powder container 6, is a nozzle, 7 is a disc part, 8 is a blower pipe 9, is a mounting round nut 10, is a mounting shaft 11 is a rotating body shaft, 12
13 is a rotating cylinder, 13 is a printing paper, 14, 15, 16 are openings, 17 is a shutter 18, is a disk joint part, 19, 20,
21 is a structure for fixing the shutter; 22 is a spacer 23; is a spacing between printing papers; 24 is a printing crosspiece frame; 25 is a cover; 26 is a mounting bracket.

Claims (4)

[Claims] (1) The air pipe is divided into two parts in the middle between the air pipe and the powder spray device to form a space, and a disk shutter that rotates in synchronization with the rotary cylinder is inserted and rotated in between, creating a space between each sheet of ejected paper. A crosspiece structure that blocks powder injection at intervals (2) Depending on the number of sheets of paper to be ejected per rotation of the rotary cylinder (1 sheet, 2 sheets, 3 sheets), the opening of the disc part can be set at 1, 2, or 3 openings. A crosspiece structure that can be created and installed selectively according to the timing with the rotating body. (3) A crosspiece structure in which two disks with ventilation openings are stacked and joined together at the outer periphery, and one or more slideable shutters are stacked inside to increase or decrease the blocking area. . (4) Depending on the type of printing and powder spray equipment, the shape of the blowing pipe of the blower pipe may be the same diameter or a condensed type, and the shape of the suction pipe may be replaced with the same diameter or a long hole shape centered on the shaft. Structure that allows use