JPH0424574Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial field of application" This invention relates to printing devices for cables, etc., and in particular has multiple doctors for removing ink to improve the printing speed on cables, etc. It is.

``Prior art'' The production line speed for cables, etc. involves an extrusion coating process, and the supply of extrusion material,
Although it depends on the curing, winding speed, etc., cables that require printing on the surface are also greatly affected by the printing speed.

In other words, in the case of so-called thin-sized cables such as CVV, IV, CCV, and CV cables, it is relatively easy to increase the production line speed such as wire drawing and extrusion coating processes, but it is difficult to increase the printing speed. , there are limits because they are affected by ink scattering phenomena, ink application speed, etc.

Referring to FIGS. 4 to 6, conventional art examples of printing devices such as cables will be explained. In the figures, reference numeral W denotes a traveling linear body to be printed, numeral 1 denotes an ink tank containing printing ink, and numeral 2 denotes its ink tank. Rotating plate roll partially immersed in ink, number 3 is plate roll 2
A printing part provided on the outer circumferential surface of the plate roll 2, numeral 4 is a doctor knife for contacting the outer circumferential surface of the plate roll 2 to remove excess ink, and numeral 5 is a doctor knife for contacting both sides of the plate roll 2 to remove excess ink. A side doctor, reference numeral 6, is an ink application means that circulates the ink 7 stored in the ink tank 1 with a pump 8 and applies the ink discharged from the nozzle 9 to the printing area 3 on the outer peripheral surface of the plate roll 2. It is.

Then, as shown by the arrow in FIG. 4, the moving and rotating traveling linear body W and the plate roll 2 are brought into contact with each other at a synchronous speed, and the ink coating film a is applied to the outer peripheral surface of the plate roll 2 by the ink coating means 6. At the same time, unnecessary parts of the ink coating film a are removed using a side doctor 5 and a doctor knife 4, and printing is performed on the surface of the linear body W by the printing section 3 that leaves an appropriate amount of ink. It is.

``The problem that the invention attempts to solve'' However, with this kind of printing technology, first of all,
By removing the excess ink adhering to both sides of the plate roll 2 by the side doctor 5 along the lines A and A in FIG. Ink b is left behind. Then,
Since the excess ink adhering to the outer peripheral surface of the plate roll 2 is removed by the doctor knife 4 on the surface indicated by the chain line B in FIG. When this phenomenon occurs and the line speed of the traveling linear body W increases, a large amount of stagnant ink d is formed below the doctor knife 4 as shown in FIG. When attempting to move in the direction of rotation of the roll 2, the doctor knife 4 is lifted and sent to the running linear body W with a thin ink layer c formed thereon, so that the surface of the running linear body W and the thin ink layer c are flush with each other. Phenomena that result in a contact state occur, and printing defects occur due to these phenomena. Further, ink overflowing from part of the ink coating film a or the plate roll 2 is scattered by centrifugal force, causing problems such as staining the surface of the traveling linear body W.

The present invention aims to solve the problems of the prior art and, in particular, to increase printing speed and improve printing accuracy by applying an appropriate amount of ink near the printing area.

``Means for Solving the Problems'' The cable or other printing device of the present invention has an ink on the surface of the plate roll in the vicinity of the plate roll for printing by bringing the printing part into contact with the surface of the running linear body. An ink applying means for applying the ink is provided, and at positions spaced apart from the ink applying means in the rotational direction of the plate roll, each having an interval in the rotational direction,
An initial doctor that removes excess ink adhering to the outer circumferential surface of the plate roll, leaving only the area near the printing area. An initial doctor with ink supply grooves facing the printing area, and an initial doctor that removes excess ink from both side edges of the plate roll. A side doctor and a finishing doctor that removes other inks while leaving the required amount of ink in the printing area are sequentially arranged. Most of the outer circumferential surface of the plate roll is removed, leaving only the area near the printed area, then the ink adhered to both sides of the plate roll is removed using a side doctor, and the ink is left only on the printed area using a finishing doctor. It is printed as follows.

"Embodiment" Hereinafter, an embodiment of the printing apparatus for cables, etc. of the present invention will be described based on FIGS. 1 to 3. Note that parts common to the prior art shown in FIG. 4 and the like are given the same reference numerals to simplify the explanation.

As shown in FIG. 1, a printing device such as a cable in one embodiment uses an ink application means 6 provided near a plate roll 2 for contacting and printing on the surface of a running linear body W. An initial doctor 10 is provided at a lower position slightly apart from the plate roll 2 in the rotational direction, and removes excess ink adhering to the outer peripheral surface of the plate roll 2 immediately after it is ejected from the nozzle 9. A side doctor 5 and a finishing doctor 11 for removing ink from areas other than the vicinity of the printing section 3 of the plate roll 2 are disposed at positions spaced apart from each other in the rotation direction. It is something. and,
As shown in FIG. 2, ink supply grooves 12 are formed in a part of the initial doctor 10 so as to surround the printing section 3 of the plate roll 2 at a certain distance. Note that the reference numeral 13 in the figure is an ink hole.

In such a printing device, when ink is ejected from the nozzle 9 of the ink application means 6 onto the plate roll 2,
An amount of ink in excess of the amount required for printing adheres in a band shape as shown in FIG. Most of the ink is removed in the plane indicated by the chain line C, and the removed ink immediately drips from the initial doctor 10 into the ink tank 1 and is transferred to the plate roll 2.
Since it is away from the outer peripheral surface, the occurrence of scattering phenomenon is reduced. Then, the remaining amount of the ink coating film a is the second
As shown in the figure, the ink supply groove 12 and the printing section 3
As shown in FIG. 3B, most of the excess ink is removed from the outer circumferential surface of the plate roll 2, except for the vicinity of the printing section 3.

In addition, if there is residual ink b protruding from the outer circumferential surface of the plate roll 2 during the removal of surplus ink by the initial doctor 10, the side doctor 5 removes the third ink.
It is removed along the chain lines d and d in Figure B, sent to the finishing doctor 10, and then further removed by the finishing doctor 10.
As a result, only the necessary ink on the printed portion 3 is removed on the surface indicated by the chain line E in FIG. The desired printing is performed by contacting the printer.

In this way, in the initial doctor 10 part, most of the ink coating film a is removed.
The resistance force increases with removal. Therefore, by setting the blade of the initial doctor 10 in a direction that bites into the plate roll 2, or by shifting the fulcrum of the initial doctor 10 in the rotational direction from the contact part, the initial doctor 10 is lifted by the viscosity of the ink. It is convenient to avoid this. Further, in the first stage doctor 10 in the example shown in FIG. 2, a hole 13 is formed to drain ink when it accumulates, and the ink also drips from this portion. As an application of this technique, when a U-shaped plate roll is scraped off with a round bar doctor, this round bar can be used as a hollow method for suction with a pump.

On the other hand, while the tolerance for changes in the amount of ink applied increases, supplying excess ink increases the burden on the initial doctor 10. As shown, it is preferable to use a variable speed motor 14 to adjust the ink supply amount in synchronization with the linear velocity (plate roll rotation). In this method, the ink application means 6 can be used not only for the ejection method using the nozzle 9 of the embodiment but also for a transfer wheel method.

"Effects of the Invention" As explained above, the cable printing apparatus of the present invention has the following effects.

(a) The first part of the applied ink film is removed by the first stage doctor, and then the side doctor and finishing doctor set the appropriate amount of ink for the printing area, so the load on the finishing doctor is light. This increases the critical speed for maintaining a stable amount of ink on the surface of the plate roll, making it possible to achieve ultra-high speed.

(b) A groove is formed in a part of the first-stage doctor to immediately remove surplus ink other than the ink supplied to the printing section, so printing stains due to ink scattering can be prevented.

(c) As described above, since the ink is applied and supplied in a concentrated manner to the printing area, there is a large tolerance to changes in line speed, and it is possible to eliminate printing breaks due to ink drying, especially at low speeds.
It is less affected by the outer diameter of the running filament, and can improve practicality.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a printing device for cables, etc. of the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIGS. An explanatory diagram of the ink adhesion state, etc. in the embodiment, Fig. 4 is a front view partially cut away showing a conventional example of a printing device such as a cable, and Figs. 5A and B are explanatory diagrams of the ink adhesion state, etc. in the conventional example. The explanatory diagram, FIG. 6, is an enlarged view of the chain line portion in FIG. 4. W... Traveling striae, 1... Ink tank, 2... Plate roll, 3... Printing section, 5... Side doctor,
6... Ink application means, 7... Ink, 8... Pump, 9... Nozzle, 10... Initial doctor, 1
1... Finishing doctor, 12... Ink supply groove.

Claims (1)

[Scope of utility model registration request] An ink coating means 6 for applying ink to the surface of the plate roll 2 is provided near the plate roll 2 for printing by bringing the printing unit 3 into contact with the surface of the traveling linear body W, and this ink coating means 6 Ink supply grooves 12 are provided at positions spaced apart from each other in the rotational direction of the plate roll 2, each having an interval in the rotational direction, for removing excess ink adhering to the outer circumferential surface of the plate roll, leaving only the vicinity of the printing area 3. , an initial doctor 10 formed to face the printing section 3, and a plate roll 2.
A printing device for a cable or the like, which is formed by sequentially disposing a side doctor 5 for removing excess ink from both side edges of the paper and a finishing doctor 11 for removing other ink while leaving a required amount of ink in the printing part 3.