JPH03219961A - Ink supply hollow stylus - Google Patents

Abstract

PURPOSE:To prevent the occurrence of rubber chips when a title stylus is sticked into a rubber cap of an ink cartridge by a method wherein the outer diameter of a second hollow stylus is not larger than the bottom diameter of a sticking tip of a first hollow stylus, and the bottom periphery of the sticking tip and the tip end of the second hollow stylus abutting thereto are in close contact with each other at right angles to an insertion direction or in a tapered from. CONSTITUTION:A sticking tip 12 of a first hollow stylus 13 is provided so as to cover the tip end of a second hollow stylus 14 at the bottom periphery thereof. The outer diameter of the second hollow stylus 14 is not larger than the bottom diameter of the sticking tip 12 of the first hollow stylus. The bottom periphery 12a of the sticking tip 12 and the tip end 14a of the second hollow stylus 14 abutting thereto are in close contact with each other at right angles to an insertion direction. When the stylus is sticked into a rubber cap 4a of an ink cartridge 4, the tip end 14a of the second hollow stylus 14 is covered with the sticking tip bottom periphery 12a of the first hollow stylus 13 so as not to directly abut against the rubber cap, thus having no possibility of scraping off the rubber cap 4a and generating rubber chips.

Description

[Detailed Description of the Invention] [Summary] Regarding the structure of an ink supply hollow needle that connects between an inkjet head and an ink cartridge in an inkjet printer and supplies ink to the inkjet head, the rubber cap of the ink cartridge The purpose of the present invention is to provide a hollow needle for supplying ink that does not produce rubber scum when inserted into an ink cartridge, and has a conical point and at least one side hole, and is inserted into an ink cartridge and inserted into the side. a first hollow needle that supplies the ink in the ink cartridge to the inkjet head from the hole; and a first hollow needle that is slidably fitted onto the first hollow needle and
If the hollow needle has not been inserted into the ink cartridge, it closes the side hole, and when inserted, after the side hole reaches inside the ink cartridge, it slides in the opposite direction to the insertion to open the side hole, and then inserts the hollow needle into the ink cartridge.
When the hollow needle is removed from the ink cartridge, the point of the first hollow needle in the ink supply hollow needle is equipped with a second hollow needle that slides in the opposite direction to the removal direction and closes the side hole. is provided so as to cover the tip of the second hollow needle with its bottom peripheral edge, and the outer diameter of the second hollow needle is equal to or less than the bottom diameter of the point of the first hollow needle, and The peripheral edge of the bottom surface and the tip of the second hollow needle that abuts the peripheral edge of the bottom surface are configured to be in close contact with each other at right angles to the insertion/extraction direction or tapered.

[Industrial Application Field] The present invention relates to the structure of an ink supply hollow needle that connects an inkjet head and an ink cartridge in an inkjet printer and supplies ink to the inkjet head.

Inkjet printers, which record by jetting ink onto a recording medium from a nozzle, are non-impact printers that generate less noise, have faster recording speeds, have excellent color development, and have many advantages such as low running costs. Office automation (OA: Office A)
It is attracting attention as an alternative to wire dot printers, mainly in the field of automation.

An inkjet printer is configured to pressurize ink in a nozzle of an inkjet head and eject it from the nozzle, and the inkjet head needs to be supplied with ink from an ink cartridge.

This mutual connection is made through an ink supply tube and an ink supply hollow needle provided at its tip, taking into account the exchange of ink cartridges.

[Conventional technology]

As shown in the perspective view of FIG. 4, an inkjet printer to which the present invention is applied moves an inkjet head 1 having a plurality of nozzles arranged in the direction of gravity facing a platen 2 in a reciprocating direction as shown by arrows A-B. A control device (not shown) selectively pressurizes the nozzles of the inkjet head 1 using, for example, a piezoelectric element to eject ink droplets to record on the opposing recording medium 3.

In the figure, 4 is an ink cartridge that stores vacuum-defoamed liquid ink, 5 is a flexible ink supply tube (hereinafter referred to as tube) that supplies ink from the ink cartridge 4 to the inkjet head 1, and 6 is this inkjet. This is a carriage that carries a head l and moves back and forth in the main scanning direction.

As mentioned above, the ink cartridge 4 and the inkjet head 1 are connected through the tube 5 as shown in the side view of FIG. It is connected to the rubber cap 4a of the ink cartridge 4 in a pointed manner.

As shown in the side sectional view of FIG. 6, the ink supply hollow needle 7 includes a first hollow needle 8 and a second hollow needle 8 that is slidably fitted on the outside.
It is composed of a hollow needle 9.

The first hollow needle 8 has a conical point lO and at least one side hole 11 provided in close proximity to the point 10,
When inserted into the ink cartridge 4, ink flows into the side hole 11 and is supplied to the inkjet head 1.

When the first hollow needle 8 is not inserted into the ink cartridge 4, the second hollow needle 9 closes the side hole 11 of the first hollow needle 8, and when inserted, the second hollow needle 9 is inserted after the side hole 11 reaches the inside of the ink cartridge 4. slide in the opposite direction to open the side hole 11,
Further, when the first hollow needle 8 is removed from the ink cartridge 4, it is configured to slide in the opposite direction to the removal direction and close the side hole 11.

The tip of the second hollow needle 9 is the point IO of the first hollow needle 8.
The tapered part 9a has the same angle as that of the first hollow needle 8, and when inserted into the ink cartridge 4, the rubber cap 4a of the ink cartridge 4 is damaged together with the first hollow needle 8, and it is possible to reach the inside of the ink cartridge 4. ing.

Further, the rear end of the second hollow needle 9 is provided with a flange 9b,
When the first hollow needle 8 is inserted until the side hole 11 reaches the inside of the ink cartridge 4, the ink cartridge 4
The second hollow needle 9 hits the rubber cap 4a and stops the second hollow needle 9 from entering.

Therefore, if the ink supply hollow needle 7 continues to enter,
Only the first hollow needle 8 enters and its side hole 11 opens.

[Problem to be solved by the invention]

In the configuration of the hollow ink supplying needle 7, when the ink supplying hollow needle 7 is inserted due to a mistake, the tapered part 9 at the tip of the second hollow needle 9
The edge a is the rubber cap 4 of the ink cartridge 4.
If the rubber slag gets into the fitting part of the first and second hollow needles, it will interfere with the sliding movement of the second hollow needle, and if it gets mixed into the ink, it will damage the ink. causes injection failure.

In order to prevent this, it is necessary to make the fitting precision of the first and second hollow needles extremely high, which poses a problem of increasing costs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hollow needle for supplying ink that does not produce rubber scum when accidentally inserted into a rubber cap of an ink cartridge.

[Means to solve the problem]

In order to achieve the above object, the hollow needle for ink supply according to the present invention has a point 12 of the first hollow needle 13 at the peripheral edge of the bottom surface of the hollow needle, as shown in the side sectional view of FIG. The second hollow needle 14 is provided so as to cover the tip of the hollow needle 14, and the outer diameter of the second hollow needle 14 is equal to or smaller than the bottom diameter of the tip 12 of the first hollow needle.
In addition, the bottom peripheral edge 12a of the point 12 and the tip 14a of the second hollow needle 14 that abuts thereon are configured to be in close contact with each other at right angles to the insertion/extraction direction or tapered.

[Effect]

When the ink supply hollow needle is attached to the rubber cap of the ink cartridge, the tip of the second hollow needle is hidden behind the periphery of the pointed bottom surface of the first hollow needle and does not come into direct contact with the rubber cap. The tip of the hollow needle does not scrape the rubber cap and create rubber slag.

〔Example〕

1 to 3 show one embodiment of the present invention.

Identical parts are designated by the same reference numerals throughout the figures.

In the ink supply hollow needle 15 according to the present invention, as shown in the side cross-sectional view of FIG. The outer diameter of the second hollow needle 14 is equal to or less than the diameter of the bottom surface of the point 12 of the first hollow needle, and the outer diameter of the second hollow needle 14 is equal to or smaller than the bottom diameter of the point 12 of the first hollow needle. The tip portion 14a of the hollow needle 14 of No. 2 is configured to be in close contact with each other at right angles to the insertion/extraction direction.

Note that 14b is a flange provided at the rear end of the second hollow needle 14, and functions in the same manner as in the prior art.

The side view of FIG. 2 shows another first embodiment, and shows the bottom peripheral edge 12a of the pointed head 12' of the first hollow needle 13' and the tip of the second hollow needle 14' that comes into contact with the bottom peripheral edge 12a. 14a' is configured to be inclined with respect to the insertion/extraction direction so as to be in close contact with the insertion/extraction direction.

Further, the side view of FIG. 3 shows another second embodiment, and the side view of FIG.
The bottom peripheral edge 12a'' of the point 12'' of the hollow needle 13'' and the distal end 14a'' of the second hollow needle 14'' that abuts this are configured to be inclined with respect to the insertion/extraction direction and to be in close contact with each other. In addition, the edge of the bottom peripheral edge 12a'' of the point 12'' of the first hollow needle 13'' is a curved surface R.

By configuring the ink supply hollow needle 15 as described above,
When this is attached to the rubber cap 4a of the ink cartridge 4, the tip 14a of the second hollow needle 14 is hidden by the pointed bottom peripheral edge 12a of the first hollow needle 13, and does not directly contact the rubber cap.

Therefore, the rubber cap 4a is not scraped off by the tip 14a of the second hollow needle and no rubber slag is generated.

Incidentally, as shown in the other first embodiment, the first hollow needle 13'
The bottom peripheral edge 12a' of the point 12' and the tip 14a' of the second hollow needle 14' that abuts this are inclined with respect to the insertion/extraction direction so as to be in close contact with each other, or As shown in the embodiment, the point of the first hollow needle 13' is 12°.
By making the edges of the bottom peripheral edge portion 12a'' of the rubber have a curved surface R, the occurrence of catching is further reduced, which is effective in preventing the generation of rubber slag.

In addition, in both the first and second embodiments, the bottom peripheral edge of the point and the tip of the second hollow needle that abuts the tip are such that the bottom peripheral edge of the point has a convex slope; Although the tip of the first hollow needle has a concave slope, conversely, the bottom peripheral edge of the point may have a concave slope, and the tip of the second hollow needle may have a convex slope.

[Effects of the Invention] According to the present invention, it is possible to provide a hollow needle for supplying ink that does not generate rubber slag when an ink cartridge fails, and has great economic and industrial effects.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a hollow needle for ink supply of the present invention, FIG. 2 is a side sectional view of another first embodiment of the hollow needle for ink supply of the present invention, and FIG. 3 is a side sectional view of a hollow needle for ink supply of the present invention. Fig. 4 is a perspective view of an inkjet printer to which the present invention is applied; Fig. 5 shows a connection between an ink cartridge and an inkjet head. FIG. 6 is a side sectional view of a conventional hollow needle for supplying ink. In the figure, l is an inkjet head, 4 is an ink cartridge, 4a is a rubber cap, 5 is an ink supply tube, 7
．． 15 is a hollow needle for ink supply; 8.13.13", 13" is a first hollow needle; 9.14.
14′, 14°° are the second hollow needles, 9a is a part of the taper,
9b is a flange, 10.12.12', 12'"
is a point, 11 is a side hole, 12a, 12a'', 12a'' is a bottom periphery, 14a,
14a'' and 14a'' are the tips. 11 part sectional view of the medium T needle for Ire 7 Hinoki of the present invention No. 1
Figure 2: A cross-sectional view of the first practical example of the 7 needles for the medium 7 needles of the present invention. Figure 2. Side view of an example Figure 3 Figure 3 Perspective view of the present invention or two exploited two-pronged needles/toarishinu Conventional needle I! + [
?

Claims (1)

[Claims] A conical point (12) and at least one side hole (12).
1), a first hollow needle (13) that is inserted into the ink cartridge and supplies the ink in the ink cartridge to the inkjet head from the side hole (11); ), the first hollow needle (13
) is not inserted into the ink cartridge, it closes the side hole (11), and when inserted, after the side hole (11) reaches inside the ink cartridge, the side hole ( 11) and when the first hollow needle (13) is removed from the ink cartridge, the second hollow needle (14) slides in the opposite direction to the removal direction and closes the side hole (11). In the hollow needle for supplying ink, the tip (12) of the first hollow needle (13) is arranged to cover the tip of the second hollow needle (14) with its bottom peripheral edge. The outer diameter of the second hollow needle (14) is equal to or less than the bottom diameter of the tip (12) of the first hollow needle, and the bottom peripheral edge (12a) of the tip (12) A hollow needle for supplying ink, characterized in that the tip (14a) of the second hollow needle (14) that comes into contact with the second hollow needle (14) is configured to be perpendicular or tapered to the insertion/extraction direction so as to be in close contact with the second hollow needle (14).