JPS5820794B2 - Marking device for sheet edge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention detects sheet defects that occur during the manufacturing process of continuous long sheets such as paper, films, foils, textiles, etc., and marks the sheet edges corresponding to the defects. This invention relates to a sheet edge marking device for marking and facilitating subsequent finishing or processing operations (correction, sampling, or cutting of defective products).

Conventionally known defect detection devices of this type include (a) one that directly marks the defective portion of a sheet running at high speed;
b) There is a method that marks the edge part corresponding to the defect occurrence area, but in the former case, the marked part is rolled up inside the winding of the sheet, so the defect mark cannot be found from outside the winding, and therefore, The latter type of this device is in practical use except in special cases.

However, even in this latter case, there is paper (containing colored paper) on the edge corresponding to the defect.
There are two types of inks: one in which the ink is inserted, and one in which ink is applied to the edge.

As for the above-mentioned paper insertion type, it is mechanically difficult to apply it to sheets that travel at high speed, so currently, ink coating methods are mainly used.

In any case, the above (a) and (4) defect detection devices are
As shown in the principle of FIG. The defect signal is sent to the marking device 14, or the defect signal is sent to the marking device 14 to record the required mark, or the defect is recorded by the device 15 at which position on the sheet, and the principle described above is independent. Or it is an application of combinations.

However, although these defect detection devices record defect signals (flashing alarm lamps) and defect positions, these signals or records alone do not allow the sheet to constantly travel at high speed. Under the environment, it is easy to overlook the defect, and it is practically difficult to confirm the defect position.

For this reason, it was not possible to immediately reflect all deficiencies in related management at the time they occurred, and some of them had to be corrected later.

This invention relates to a device that applies ink to the edge of a sheet running at high speed, and when a marking head made of felt or the like impregnated with ink is brought into contact with the edge of the sheet, a strong swirl of air is generated when the sheet running at high speed is wound up. This solves the conventional drawback that the ink applied to the sheet edge scatters due to the ink and generated static electricity, staining the sheet surface more than 50M from the edge.

That is, the present invention is an improvement of a marking device that applies ink to the edge of a sheet traveling at high speed.The gist of the invention is to bring a marking head formed so that it can appear and retract freely into contact with the edge corresponding to the defect at the time of detecting a defect in the sheet, and at the same time. It is surrounded by an airflow adjustment surface and has a configuration in which a strong airflow is ejected from the center of the sheet (in the width direction) toward the edge of the sheet.

An embodiment of the present invention will be described below with reference to the drawings.

(Identical parts are indicated by the same reference numerals).

FIG. 2 is a diagram of the air blow system of this invention.

When a defect is detected in the sheet 4 currently running at high speed, the detection signal is amplified via an amplifier (not shown).
Air cylinder 2 for pushing up marking head 1
, the retractable marking head 1 is pushed up to the 1729th position of the sheet 4 and comes into contact with it.

At this time, blow air is supplied from the center of both the upper and lower surfaces of the seat 4 to the air nozzle 9 (
An air constant flow valve 6 and a pressure reducing valve 7 are provided between the seat edges at the 9th position) to the air source in the direction of the 1729th position.

In this case, if the solenoid valves 3 and 3' are operated simultaneously,
Cylinder operation and air blowing can be synchronized.

Note that it is also possible to keep air constantly blown if necessary.

FIG. 3 is an explanatory diagram schematically showing an example of a three-speed type ink marking device, in which three types of ink can be used depending on the position in the width direction of the sheet.

That is, the sheet 4 is guided by the sheet guide plate 8 and passes through the marking device 14 as shown in the figure, but if a defective part is detected in the sheet 4 at this time, the marking head 1 is moved as shown by the air blow system. Sheet 1799 in the defective area pushed up by air cylinder 2
come into contact with the position.

At this time, air is supplied from the center of the sheet 4 in the width direction
Since the air nozzle 9 is connected to the air pipe 5 facing toward the 729th position and is injected from the air nozzle 9 having a flat opening end, it is possible to feed stronger air pressure over a wider area. Preventing the ink from scattering onto the inner surface of the sheet 5 also speeds up the drying of the ink and prevents the deep staining of the inside of the sheet 4, which was conventionally seen, and prevents this type of ink from scattering. effective in preventing

Moreover, this air nozzle 9 is connected to the fourth
Provided symmetrically toward the sheet edge as shown,
In addition, since these nozzles 9 are covered by an air flow adjustment surface 10 that is open on the entire sheet edge side and a part on the sheet surface side, the jetted air is balanced within the curve and becomes stable air. Since the sheet is fed toward the edge of the sheet surface as a flow, better results can be obtained.

This means that, for example, in the case where the air flow adjustment surface 10 is not provided, the air blow is caused by the air entrainment that occurs when the sheet is wound up due to high-speed running of the sheet, and the vortex generated by the air flow injected from the nozzle 9. This can be clearly seen from the fact that it is inhibited.

Therefore, according to the present invention configured as described above, the portion corresponding to the defect detected on the sheet surface (width direction) is clearly and clearly displayed with ink at the end of the sheet being wound up. By observing the winding end surface after winding, the position of a defect in the sheet to be wound can be accurately recognized.

Therefore, in the subsequent process, it is easy to efficiently repair or remove defective parts of the sheet without loss caused by stains caused by ink application, which improves productivity from a quality assurance perspective. The beneficial effects of the present invention on the relevant industrial field are also significant.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the general principle of a marking device for sheet edges, Fig. 2 is a diagram of an air blow system of the inventive device, and Fig. 3 is a schematic explanatory diagram showing an embodiment of the same device.
FIG. 4 is a schematic explanatory diagram showing the state of the air nozzle inside. 01... Marking head, 2
...Air cylinder, 3,3'...Solenoid valve, 4...Seat, 5...Air pipe,
6... Air constant flow valve, 7... Pressure reducing valve,
8... Seat guide plate, 9... Opening end flat nose/, L/, 10... Air flow adjustment surface, 1
DESCRIPTION OF SYMBOLS 1... Defect detection part, 12... Main panel, 13... Alarm device, 14... Marking device, 15... Recording device .

Claims (1)

[Scope of Claims] 1. Air nozzles are provided on both the upper and lower sides of the running sheet opposite to an ink applicator that marks the edge of the running sheet according to the detected defective portion of the running sheet, and the air nozzle is installed at the edge end of the running sheet. A marking device for a sheet edge, characterized in that a part or all of the side and the sheet surface side are covered with an open air adjustment surface. 2. The sheet edge marking device according to claim 1, wherein the ink applicator is a marking head that can freely appear and retract. 3. The sheet edge marking device according to claim 1 or 2, wherein the opening end of the air nozzle is flat.