JPS62101449A - Ink jet printer head protection device - Google Patents

Abstract

PURPOSE:To prevent movement of an airtight plug and thereby clock the inflow of air into a hermetically sealed chamber by allowing a thinned wall of the chamber due to scraping to move in the second plate direction and increasing the volume of the chamber when a protection liquid in the chamber has thermally expanded. CONSTITUTION:A rubber body 3 contact the surface of the second plate 2 side closely to form a hermetically sealed chamber 9 which is continuous to a nozzle 8 on a head 6, and a protection liquid injection port 10 is provided on the top of the chamber. An external wall on the second plating 2 side of the chamber 9 is scrapped off so that a prearranged clearance with the second plate 2 may be formed. Further, the protection liquid injection port 10 of the rubber body3 is divided into two holes 12, 13 halfway in its path and one hole 12 is for inserting pipe for protection liquid injection, while the other hole 13 is for air venting. Under the above constitution if the protection liquid in the chamber 9 thermally expanded due to the sudden change or an atmospheric temperature to an extremely high or low level, the external wall of the second plate 2 side moves to this side, thus reducing the pressure of the chamber 9. This is because of the thinned wall due to scraping. Consequently, it is possible to prevent the seal from becoming defective by the movement of an airtight plug 5 under pressure and thereby shut off the air coming into the chamber 9.

Description

Detailed Description of the Invention (a) Industrial Application Field This invention prevents clogging of the nozzle due to air entering the nozzle due to changes in outside temperature during transportation or long-term storage of an inkjet printer. This invention relates to a device for carrying out training.

(1) Prior Art Generally, in an inkjet printer, ink is ejected in the form of particles, and seven dots are ejected onto a recording paper on a platen. Therefore, if air gets into the nozzle, the ink will dry out, and if the nozzle becomes clogged, the ink supply system may become clogged.

In conventional inkjet printers, in order to prevent ink from drying in the nozzle, for example, ink is intermittently ejected at regular intervals when the printer is not operating, or the nozzle is automatically capped when the power is turned off. Various efforts have been made (patent application fin 56-76)
(See Publication No. 144).

(c) Problems to be solved by the invention However, if the outside temperature becomes extremely high or low, for example, during transportation from a dealer to another user or during long-term storage, The seal by the cap on the 91st part was incomplete, and air got mixed into the nozzle part, causing the same trouble as in the previous mli.

This invention was made in view of the above circumstances, and has a simple structure that prevents air from entering the nozzle even when the outside temperature changes to extremely high or low temperatures when an inkjet printer is transported overseas or stored for a long period of time. The purpose is to provide a device to obtain

(D) First stage for solving the problems This invention is an inkjet printer head protection device that is removably attached to both side walls of an ink tank of an Infusiera I printer. A pair of first electrodes protrude opposite to each other in the ink jetting direction of the printer.
a second sheet metal removably attached to the first sheet metal facing the ink cartridge 1 to the head of the printer; and a second sheet metal supported by the second sheet metal and closely attached to the second sheet metal side of the head. a rubber body that forms a sealed chamber that bypasses a nozzle provided in the head and has a protective liquid inlet formed at the top, and a sealing plug that seals the protective liquid inlet; The outer wall surface on the second sheet metal side is ground down so that a predetermined gap is formed between the second sheet metal and the second sheet metal.

(e) Function This invention provides that when an inkjet printer is transported overseas or stored for a long period of time, even if the outside temperature changes to extremely high or low temperatures and the protective liquid in the sealed chamber gets hot, the sealed chamber will not be scraped off. By moving the thinned wall in the direction of the second sheet metal and increasing the volume of the sealed chamber, the sealing stopper is prevented from moving due to expansion of the protective liquid, making it tightly sealed! It is designed to prevent air from entering the room.

(f) Example The present invention will be described in detail with reference to the embodiment shown in the J-Z diagram.

1, 2, and 3 are a plan view, a side view, and a sectional view of the apparatus of the present invention. In the figure, the head protection device of the inkjet printer includes a pair of first metal plates (
1) It mainly consists of (1), a second metal plate (2), a rubber body (3) and a sealing plug (4).

The first metal plate (1) protrudes in opposition to the ink jetting direction of the inkjet printer, and is removably attached to both side walls of the ink tank (5) of the inkjet printer.

The second sheet metal (2) is the head (6) of the inkjet printer.
) on the first sheet metal (1) so that it faces the
It is fixed in place.

The rubber body (3) is supported by the second metal plate (2) and is attached to the head (6).
), which forms a sealed chamber (9) that communicates with a nozzle (8) provided in the head (6) in close contact with the second sheet metal (2) side surface of the head (6), and a protective liquid injection hole is attached to the top of the chamber (9). is provided, and the outer wall of the sealed chamber (9) on the second metal plate (2) side is ground down so as to form a predetermined gap with the second metal plate (2). It is preferable that the gap is usually about 0.4 to 0.7 mm. In addition, the rubber body (3) is shown in Figures 3 and 4 (
As shown in C), the inner bottom surface of the closed chamber (9) is inclined toward the nozzle (8), and the communication hole 01) that communicates with the nozzle (8) is as shown in No. Its upper edge is shaped like a chevron. Furthermore, the protective liquid injection rl(K')l of the rubber body (3) is divided into two holes f121 (13) in the middle, as shown in FIGS. 3 and 4(a). One hole rI'?I is a hole into which a pipe (not shown) for injecting a protective liquid is inserted, and the other hole 03) is a hole for venting air.

The sealing plug (4) tightly engages with the protective liquid inlet (1) to seal the FF inlet (7). In addition, the third
In the figure, (14) is the gate (blocking screw), C15)
06) is an ink passage, 06) is a piezo, the side is a pressure chamber, and 08) is an ink tank plug (see also FIGS. 1 and 2).

Next, we will discuss measures to be taken during overseas transportation and long-term storage of inkjet printers using this device.

First, screw the second sheet metal (2) into the first sheet metal (1) using a screw.
and press the rubber body (3) against the head (6).

Then, the gate 04) of the ink tank (9) is lowered to block the ink passage 05) to the head (6). Next, insert the pipe into the hole (+21) and pour the protective liquid into the sealed chamber (9).
to replace the air inside. And the sealing stopper (
5) Seal the protective liquid inlet, and insert the stopper 08) into the ink replenishment hole 091 of the ink tank.

1 suit, the temperature of the outside air is extremely high (1 (H, A <=), so even if the protective liquid in the sealed chamber (9) thermally expands, the second sheet metal ( Since the outer wall surface on the side 2) has been shaved and becomes thinner, that wall can move toward the second sheet metal (2) side and lower the pressure inside the sealed chamber (9). ) The sealing plug (5) moves due to the pressure inside ()
This will prevent the seal from becoming incomplete. However, with ), air will no longer be able to enter the sealed chamber (9). Also,
When injecting the protective liquid, the air in the sealed chamber (9) escapes from the air vent hole 03), and the upper edge between the communication holes is
i'! Because of this, it is difficult for air to get into the surrounding walls, and the residual air in the sealed chamber (9) can be minimized.

(G) Effects of the invention According to this invention, when an inkjet printer is transported overseas or stored for a long period of time, even if the outside temperature becomes extremely high or low and the protective liquid inside the sealed room expands thermally, air still flows into the sealed room. It is possible to prevent this from happening. Therefore, clogging of the nozzle due to air intrusion can be prevented.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are a plan view, a side view, a sectional view taken along line A-A in FIG. 1, and FIG.
) mountain) (C> is a plan view of the rubber body used in this invention,
They are a side view and a sectional view taken along line B-F3 in FIG. 4(a). (1)...y, i sheet metal, (2)...
...Second sheet metal, (?3)...Rubber body,
(4)...Sealing plug, (5)...Ink tank, (6)...Head, (E3)...
... Nozzle, (9) ... Sealed chamber, (
b))...Protective liquid inlet. (Ma J

Claims (1)

[Claims] 1. A pair of first metal plates that are removably attached to both outer walls of the ink tank of the inkjet printer and protrude opposite to each other in the ink jetting direction of the inkjet printer, and a pair of first metal plates that are removably attached to the first metal plates that face the head of the inkjet printer. a second sheet metal attached to the head, and a sealed chamber supported by the second sheet metal and communicating with a nozzle provided in the head in close contact with a surface on the second sheet metal side of the head, and having a protective liquid inlet at the top. and a sealing plug for sealing the protective liquid inlet, and the outer wall surface of the sealed chamber on the second sheet metal side is ground down so that a predetermined gap is formed between the sealed chamber and the second sheet metal. An inkjet printer head protection device characterized by: