JPS5825504B2 - marking couch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marking device that sprays marks using paint or the like.

For example, in flaw detection work, the flaw detection results are coded and marked on the object to be inspected.

To perform coded markings like this, a quick-drying marking liquid is ejected from a thin nozzle, but if the marking liquid is not ejected from the nozzle, the marking liquid will dry near the nozzle's outlet and cause clogging. Easy to occur.

This invention was made in order to eliminate the above-mentioned drawbacks, and utilizes the surface tension of the marking liquid anti-caking agent to close the discharge port of the nozzle while marking is not being performed, thereby isolating the nozzle from the air. Another object of the present invention is to provide a marking device with a simple structure that does not cause clogging even when a quick-drying marking liquid is used.

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

In FIG. 1, 1 is, for example, an outer diameter of 1 mx and an inner diameter of 0.
The marking nozzle 2, which is a vertically fixed tube of about 8 mrn, has an inner diameter of about 2u, which is larger than the marking nozzle 1, and is a protection tube provided concentrically with the nozzle 1.

The discharge port 3 of the marking nozzle 1 is fixed in a state that it is retracted into the protection tube 2 by about 2 u from the lower open end 4 of the protection tube 2.

In the marking nozzle 1, for example, 3
A marking liquid 6 having a viscosity of about a poise is supplied from a pump 7, and a marking liquid anti-coagulation agent using a non-volatile liquid such as machine oil 8 is supplied between the marking nozzle 1 and the protective tube 20 from a pump 9.

The machine oil 8 supplied between the marking nozzle 1 and the protection tube 20 is applied to the protection tube 2 due to surface tension at the lower end of the protection tube 2.
It spans a space Δt between the lower end and the lower end discharge port of the marking nozzle 1, and the lower end opening of the protection tube 2 is sealed and the marking nozzle 1 is isolated from the air, preventing the marking liquid from coagulating and clogging the marking nozzle 10. is prevented.

When the solenoid valve 5 is energized and the marking liquid 6 at a certain pressure is supplied to the marking nozzle 1, the marking liquid 6 flows from the discharge port 3 into the machine oil spread over the space by the above Δ as shown at 10 in FIG. 8 and is discharged outside the protective tube 2, allowing predetermined marking to be performed.

When the solenoid valve 5 is demagnetized and the supply of the marking liquid 6 is stopped, the machine oil 8 is again stretched over the discharge port of the marking nozzle 1 due to surface tension, and the marking nozzle 1 is sealed, returning to the state shown in FIG. and isolated from the air.

The tip of the protective tube 2 may be squeezed at the lower end of the protective tube 2 so that the opening has a small diameter as shown in FIG.

4 and 5 show other embodiments of the invention.

In FIGS. 4 and 5, 11 is a marking nozzle, the tip of which is beveled into a syringe needle shape and has a bevel 12.
It is housed in a protective tube 13 with an opening at the lower end so as to be vertically movable.

The tip of the nozzle 11 may be cut flat without being beveled.

Machine oil 8 is installed between the marking nozzle 11 and the protection tube 130.
is filled with.

During the period when marking is not performed, marking nozzle 1
1 is pulled up into the protection tube 13, and the machine oil 8 is stretched over the lower end opening of the protection tube 13 due to surface tension.
The tip of the marking nozzle 11 is isolated from the air, preventing the marking liquid 6 from coagulating and clogging the nozzle.

When marking, move the marking nozzle 11 to the fifth
It descends as shown in the figure, protrudes the groove 12 from the protective tube 13, discharges the marking liquid 6, and performs marking.

When marking is completed, the marking nozzle 11 is raised and returned as shown in FIG. 4, and the machine oil 8 again seals the lower end of the protective tube 13 due to surface tension, and the tip of the marking nozzle 11 is isolated from the air.

To move the marking nozzle 11 up and down, as shown in FIG.
may be pushed up, and at the time of marking, the eccentric cam 15 may be rotated to push down the nozzle 11 by the extension force of the spring 16.

Alternatively, the rotation of a pinion (not shown) may be transmitted to a rack (not shown) provided on the nozzle 11 to move it up and down.

As described in detail above, when marking is not performed, the marking nozzle is drawn into a protective tube with an opening at the lower end filled with a marking liquid anti-caking agent to cut off contact between the nozzle and air, and the marking liquid is removed. This prevents the nozzle from clogging, even if a quick-drying marking liquid is used and a thin nozzle is used. Since the closure is caused by tension, there is no need for a mechanical opening/closing mechanism, resulting in a simple structure, stable operation, and long life.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing one embodiment of the present invention, FIG. 3 is a view showing a modification of the protective tube, and FIGS. 4 and 5 are cross-sectional views showing other embodiments. 1.11...Marking nozzle, 2,13...
... Protection tube, 6 ... Marking liquid, 8 ...
...machine oil.

Claims (1)

[Claims] 1 The discharge side end of the marking nozzle that discharges the marking liquid shall be stored in a protective tube with an open end containing a marking liquid anti-caking agent, with the open end slightly retracted, and when not performing marking. The marking device is characterized in that the open end of the protective tube is closed with a marking liquid anti-coagulation agent.